Protecting Environmentally-Sensitive Areas and Promoting ...
Environmentally Sustainable Bioinspired Design
-
Upload
khangminh22 -
Category
Documents
-
view
1 -
download
0
Transcript of Environmentally Sustainable Bioinspired Design
The Thesis Committee for Julia Marie O’Rourke
Certifies that this is the approved version of the following thesis:
Environmentally Sustainable Bioinspired Design: Critical Analysis and
Trends
APPROVED BY
SUPERVISING COMMITTEE:
Carolyn C. Seepersad
Michael E. Webber
Supervisor:
Environmentally Sustainable Bioinspired Design: Critical Analysis and
Trends
by
Julia Marie O’Rourke, B.A.; B.S.E.
Thesis
Presented to the Faculty of the Graduate School of
The University of Texas at Austin
in Partial Fulfillment
of the Requirements
for the Degrees of
Master of Science in Engineering
and
Master of Public Affairs
The University of Texas at Austin
May 2013
iv
Acknowledgements
I would like to acknowledge support from a National Science Foundation Graduate
Research Fellowship and a Powers Fellowship from the University of Texas at Austin. I am
also grateful for the efforts of Katherine Adams, who contributed to the GDG analysis and
keyword trends analysis. Finally, I would like to thank Dr. Seepersad and the other members
of the Product, Process, and Materials Design Lab for their feedback and encouragement
along the way.
v
Abstract
Environmentally Sustainable Bioinspired Design: Critical Analysis and
Trends
Julia Marie O’Rourke, M.S.E., M.P.Aff.
The University of Texas at Austin, 2013
Supervisor: Carolyn C. Seepersad
Within the bodies of living organisms are multitudes of sustainable design
solutions that engineers have yet to master. Through the use of tailored sustainable
bioinspired design (BID) tools and methodologies, engineers could access and apply this
body of biological knowledge to reduce the environmental impact of engineering designs.
However, the underlying theory of BID must be more thoroughly fleshed out – and a
clearer understanding of the types of sustainability solutions present in biology must be
achieved – before such tools and methodologies can be developed. The goal of this thesis
is to tackle both issues and, consequently, lay the foundation for environmentally
sustainable BID.
The first section of this work critically examines thirteen of the most frequently-
cited benefits of BID, using academic literature from both biology and engineering
design. This analysis presents a nuanced explanation of the ways BID could improve
designs and the conditions in which these improvements are expected. Hence, it provides
vi
the theoretical foundation necessary to develop tools and methodologies that capitalize on
the design opportunities found in biological organisms.
The second section focuses on identifying sustainability-related trends in a pool of
existing, sustainable BIDs. The type of environmental impact reduction conferred by the
bioinspired feature is delineated using a set of 65 green design guidelines (GDGs) to
compare the impact of the BID and a functionally-equivalent comparison product.
Additionally, the general design features that impart an environmental impact reduction
to the sustainable BIDs are identified, analyzed, and discussed. These results provide
insight into the types of sustainability solutions that can be found using biological
analogies.
vii
Table of Contents
List of Tables ....................................................................................................... xiv
List of Figures ..................................................................................................... xvii
Chapter 1: Introduction ............................................................................................1
1.1 Background ...............................................................................................1
1.1.1 Sustainable Design ........................................................................1
1.1.2 Bioinspired Design (BID) .............................................................2
1.1.3 Sustainable BID ............................................................................2
1.1.4 Literature Connecting BID and Sustainability ..............................3
1.1.5 Examples of Sustainable BIDs......................................................4
1.2 Thesis Motivation .....................................................................................7
1.3 Thesis Organization ..................................................................................8
Chapter 2: Literature Review .................................................................................11
2.1 Understanding and Measuring Environmental Impact ...........................11
2.1.1 Life Cycle Assessment (LCA) ....................................................11
2.1.1.1 LCA Challenge #1 - Subjectivity. ...................................12
2.1.1.2 Environmental Ethics ......................................................12
2.1.1.3 Environmental Impact Categories...................................14
2.1.1.4 LCA Challenge #2 - Detailed data are needed. ...............15
2.1.2 Green Design Guidelines (GDGs) ..............................................16
2.2 Previous Work ........................................................................................18
2.2.1 BID Design Principles and Guidelines .......................................18
2.2.2 Design Principles in Biology ......................................................20
2.3 Conclusion ..............................................................................................24
Chapter 3: Theoretical Study Overview ................................................................25
3.1 Introduction to BID Benefits Study ........................................................25
3.2 Methodology for BID Benefits Study .....................................................26
3.3 Results Overview ....................................................................................27
viii
3.4 Conclusion ..............................................................................................30
Chapter 4: Ideation-Related Archetypal Claims ....................................................31
4.1 BID helps designers generate novel ideas. .............................................31
4.2 Quantity: Biology contains many potential analogies. ...........................36
4.3 Variety: Biology is diverse. ....................................................................37
4.4 Relevance: Biology solves problems engineers would like to solve. .....39
4.5 Biology solves problems differently than engineering. ..........................40
4.6 Conclusion ..............................................................................................43
Chapter 5: Optimization in Biology .......................................................................45
5.1 Biology is optimal. ..................................................................................46
5.2 Biology is optimized by evolution via natural selection. ........................49
5.2.1 Metaphors for ‘Evolution’ in BID Literature..............................50
5.2.2 Evolution via natural selection optimizes populations. ..............52
5.2.3 Factors that Impede Optimization via Natural Selection ............54
5.2.4 Macroevolution: Speciation and Extinction................................58
5.3 Biology is optimized for efficiency. .......................................................62
5.4 Conclusion ..............................................................................................64
Chapter 6: Sustainability-Related Benefits ............................................................66
6.1 Biology has withstood the test of time. ...................................................67
6.2 Biological organisms are environmentally sustainable...........................69
6.2.1 Human-Related Environmental Impact ......................................70
6.2.2 Environmental Impact of Biology Unrelated to Humans ...........72
6.3 Biology has specific environmental advantages. ....................................74
6.3.1 Biological organisms use renewable and abundant inputs. ........74
6.3.2 Biological materials are nontoxic. ..............................................75
6.3.3 Biological organisms employ sustainable manufacturing processes.
.....................................................................................................76
6.3.4 Biological organisms do not pollute. ..........................................78
6.3.5 Materials in biology are recycled. ...............................................81
6.3.6 Biology is resistant to damage. ...................................................82
ix
6.3.7 Biology is efficient. .....................................................................83
6.4 Conclusion ..............................................................................................86
Chapter 7: BID Benefits.........................................................................................88
7.1 BIDs are optimized. ................................................................................88
7.2 BIDs are sustainable. ..............................................................................89
7.2.1 BIDs are efficient. .......................................................................89
7.3 Support for All BID Benefits Claims......................................................89
7.4 Caveats Common to All BID Benefits Claims .......................................90
7.4.1 The designer should intentionally try to produce a design with the
desired characteristic. ..................................................................90
7.4.2 The pool of potential biological analogies should be scoped to those
containing the trait of interest. ....................................................92
7.4.3 One must focus on the relevant features of the selected analogy.93
7.4.4 How closely does the BID imitate the biological system? .........93
7.4.5 Will the desirable trait in biology transfer to engineering? ........94
7.4.6 A desirable biological trait may not continue to be desirable in a
BID. .............................................................................................94
7.4.7 Even beneficial features can have unintended detrimental effects.96
7.5 Conclusion ..............................................................................................97
Chapter 8: Theoretical Section Conclusion ...........................................................98
8.1 Summary of Findings from BID Benefits Study ....................................98
8.2 Other Claims Identified But Not Analyzed ..........................................101
8.3 What counts as a biological analogy in BID? .......................................101
8.3.1 Genetically Modified Organisms and Human Selection ..........102
8.3.2 Extinct Species ..........................................................................102
8.3.3 Tools and Artifacts of Animals .................................................103
8.4 Future Work ..........................................................................................104
8.5 Conclusion ............................................................................................106
Chapter 9: Research Methods to Find Trends in BIDs ........................................107
9.1 Step 1: Compile a List of BIDs .............................................................108
x
9.1.1 Breadth Search ..........................................................................108
9.1.2 Depth Search .............................................................................109
9.2 Step 2: Information Collection..............................................................111
9.3 Step 3: Selecting Designs to Analyze ...................................................112
9.3.1 Criterion 1: The design is bioinspired. ......................................113
9.3.2 Criterion 2: The design is feasible. ...........................................114
9.3.3 Criterion 3: Proof of a reduced environmental impact. ............115
9.4 Analyzing Individual Designs Using Green Design Guidelines (GDGs)115
9.5 Conclusion ............................................................................................118
Chapter 10: Data and Analysis of GDG Trends Study ........................................119
10.1 Breadth and Depth Search Results ......................................................119
10.2 How BIDs Researched In Depth Fared Against Selection Criteria ....120
10.3 Design Library ....................................................................................120
10.4 Aggregate Data from GDG Analysis ..................................................122
10.5 Validation of GDG Results .................................................................127
10.5.1 Independent Raters..................................................................127
10.5.2 Comparison of Results with Other Work................................128
10.6 Conclusion ..........................................................................................129
Chapter 11: Additional Keyword Trends .............................................................130
11.1 Methodology of Keyword Trends Study ............................................130
11.2 Identifying Keywords .........................................................................131
11.3 Passive Mechanisms ...........................................................................131
11.3.1 Examples of Passive Mechanisms ..........................................133
11.3.2 Potential Environmental Benefits of Passive Mechanisms .....134
11.3.3 Passive Mechanisms Conclusion ............................................135
11.4 Multifunctional Designs......................................................................135
11.4.1 Examples of Multifunctional Designs ....................................136
11.4.2 Potential Environmental Benefits of Multifunctional Designs137
11.4.3 Potential Environmental Benefits of Modular Designs ..........138
11.4.4 Multifunctional Design Conclusion ........................................139
xi
11.5 Optimized Geometries ........................................................................139
11.5.1 Examples of Optimized Geometries .......................................140
11.5.2 Potential Environmental Benefits of Optimized Geometries..141
11.5.3 Optimized Geometries Conclusion .........................................142
11.6 Validation of Keyword Trends by Analyzing 9 Sustainable BIDs .....142
11.6.1 How This Analysis Validates the Three Keyword Trends .....143
11.7 Validation of Trends Using BID Literature ........................................144
11.7.1 Passive Mechanisms ...............................................................144
11.7.2 Multifunctional Designs..........................................................145
11.7.3 Optimized Geometries ............................................................146
11.8 Conclusion ..........................................................................................147
Chapter 12: Section 2 Conclusion........................................................................148
12.1 Summary of Section 2 .........................................................................148
12.2 Challenges Encountered......................................................................150
12.3 Future Work ........................................................................................150
12.3.1 Analyzing More Sustainable BIDs .........................................150
12.3.2 Developing Tools and Methodologies for Sustainable BID ...152
12.3.3 Identifying Potential Benefits of BID over Other Design-by-
Analogy Techniques .................................................................153
12.4 Conclusion ..........................................................................................153
Chapter 13: Thesis Conclusion ............................................................................155
13.1 Summary of Thesis .............................................................................155
13.2 Discussion of Thesis ...........................................................................156
13.3 Future Work ........................................................................................158
Appendix A: Design Library Entries for 9 BIDs That Met All Selection Criteria and
Were Analyzed Using GDGs ......................................................................162
A.1 Biolytix Filter .......................................................................................163
A.2 Daimler-Chrysler Bionic Car – Shape .................................................168
A.3 Daimler-Chrysler Bionic Car – Structure ............................................171
A.4 Eastgate Centre Cooling System ..........................................................174
xii
A.5 Interface FLOR i2 Entropy Carpet.......................................................177
A.6 Self-Cleaning Transparent Thin Film ..................................................180
A.7 Sharklet Antimicrobial Surface ............................................................183
A.8 Shinkansen 500 Series Nose Cone .......................................................187
A.9 Shinkansen 500 Series Pantograph ......................................................193
Appendix B: Design Library Designs with Insufficient Information ..................197
B.1 Airbus 320 ............................................................................................198
B.2 Baleen Water Filters .............................................................................200
B.3 Passive Walking Bipedal Robot ...........................................................203
B.4 Calera Cement ......................................................................................206
B.5 Geckel...................................................................................................211
B.6 HotZone Radiant Heater.......................................................................214
Appendix C: Design Library Designs Eliminated Using 3 Criteria ....................217
C.1 Crystal Palace in London .....................................................................218
C.2 Eiffel Tower .........................................................................................220
C.3 Velcro ...................................................................................................222
Appendix D: Green Design Guidelines Adapted From Telenko [61] .................225
Appendix E: 128 Sources Analyzed in BID Benefits Study................................227
Appendix F: BIDs Found from Breadth and Depth Searches..............................235
Appendix G: Comparison of the Environmental Impact of BIDs and Competitors
Using GDGs with Justification ...................................................................241
G.1 Biolytix.................................................................................................241
G.2 Daimler-Chrysler Bionic Car – Shape .................................................242
G.3 Daimler-Chrysler Bionic Car – Structure ............................................243
G.4 Eastgate Centre Cooling System ..........................................................244
G.5 Interface FLOR i2 Entropy Carpet.......................................................245
G.6 Self-Cleaning Transparent Thin Film ..................................................246
G.7 Sharklet Antimicrobial Surface ............................................................248
G.8 Shinkansen 500 Series Nose Cone .......................................................249
xiii
G.9 Shinkansen 500 Series Pantograph ......................................................249
Appendix H: Analysis of 9 Sustainable BIDs for Passive Mechanisms,
Multifunctional Designs, and Optimized Geometries ................................250
H.1 Biolytix.................................................................................................250
H.2 Daimler-Chrysler Bionic Car – Shape .................................................250
H.4 Eastgate Centre Cooling System ..........................................................251
H.5 Interface FLOR i2 Entropy Carpet.......................................................252
H.6 Self-Cleaning Transparent Thin Film ..................................................252
H.7 Sharklet Antimicrobial Surface ............................................................253
H.8 Shinkansen 500 Series Nose Cone .......................................................253
H.9 Shinkansen 500 Series Pantograph ......................................................254
References ............................................................................................................255
xiv
List of Tables
Table 1: LCA midpoint categories and damages to environment [51] ..................15
Table 2: “Biomimetic design guidelines with examples of corresponding bio-inspired
characteristics and the percentage of reviewed products that display
them” from Wadia and McAdams [62]. ...........................................19
Table 3: Biomimetic design principles from Wadia [63] ......................................20
Table 4: Efficiencies of Common Anthropogenic and Natural Energy Conversion
Efficiencies from Tester [221] and adapted from Smil [223]. ..........85
Table 5: Summary of Findings from Theoretical BID Benefits Study. .................98
Table 6: Design Selection Criteria .......................................................................113
Table 7: The first six BIDs considered for analysis.. ...........................................119
Table 9: Summary of GDG Analysis, Organized by both GDG and BID. ..........123
Table 10: GDGs met better by the BIDs. .............................................................124
Table 11: Examples of passive mechanisms in non-BID engineered systems, BIDs,
and biological systems. ...................................................................133
Table 12: Examples of multifunctional designs in non-BID engineered systems, BIDs,
and biological systems. ...................................................................136
Table 13: Examples of optimized geometries in non-BID engineered systems, BIDs,
and biological systems. ...................................................................140
Table 14: Keyword trends found in sustainable BIDS. .......................................142
Table 15: Summary of the GDGs most frequently met better by the 9 sustainable
BIDs. ...............................................................................................149
Table 16: Summary of the keyword trends found in the 9 sustainable BIDs. .....149
Table 17: Claims analyzed in Chapter 6 with related GDGs. ..............................160
xv
Table 18: 128 Sources Analyzed in BID Benefits Study.. ...................................227
Table 19: BIDs Found from Breadth and Depth Searches. .................................235
Table 20: The GDGs met better by Biolytix than by its competitor. ...................241
Table 21: The GDGs met better by the shape of the bionic car than by its competitor.
.........................................................................................................242
Table 22: The GDGs met better by the structure of the bionic car than by its
competitor. ......................................................................................243
Table 23: The GDGs met better by the Eastgate Centre’s cooling system than by its
competitor. ......................................................................................244
Table 24: The GDGs met better by Entropy carpet than by its competitor. ........245
Table 25: The GDGs Entropy tiles might meet better than standard carpet tiles in
some scenarios. ...............................................................................246
Table 26: The GDGs met better by the self-cleaning surface than by its competitor.
.........................................................................................................246
Table 27: The GDGs met worse by the self-cleaning surface than by its competitor.
.........................................................................................................247
Table 28: The GDGs that might be met better by the self-cleaning surface than by its
competitor, but ambiguity exists. ....................................................247
Table 29: The GDGs met better by Sharklet than by its competitor. ..................248
Table 30: The GDGs where it is unclear whether Sharklet or its competitor is
environmentally superior. ...............................................................248
Table 31: The GDGs met better by the Shinkansen nose cone than by its competitor.
.........................................................................................................249
Table 32: The GDGs met better by the Shinkansen pantograph than by its competitor.
.........................................................................................................249
xvi
Table 33: Keyword Trends Analysis for Biolytix. ...............................................250
Table 34: Keyword Trends Analysis for the Shape of the Bionic Car. ...............250
Table 35: Keyword Trends Analysis for the Structure of the Bionic Car. ..........251
Table 36: Keyword Trends Analysis for Eastgate Centre’s Cooling System. .....251
Table 37: Keyword Trends Analysis for Entropy Carpet. ...................................252
Table 38: Keyword Trends Analysis for the Self-Cleaning Surface. ..................252
Table 39: Keyword Trends Analysis for Sharklet Antimicrobial. .......................253
Table 40: Keyword Trends Analysis for the Shinkansen 500 Series Nose Cone.253
Table 41: Keyword Trends Analysis for the Shinkansen 500 Series Pantograph.254
xvii
List of Figures
Figure 1: Sustainable BID lies at the intersection of sustainable design and BID.. 3
Figure 2: The energy efficient cooling system in Eastgate Centre [35] is a sustainable
BID inspired by cooling in termite mounds that replaces a standard
industrial air conditioner. ....................................................................5
Figure 3: Shape evolution from boxfish to car [40]. ................................................6
Figure 4: Self-cleaning surface inspired by the surface chemistry of the lotus leaf.7
Figure 5: The relation of midpoint categories and damage indicators [51]. ..........14
Figure 7: Life’s Principles, the 2009 version from the Biomimicry Guild [64] ....22
Figure 6: Life’s Principles, the 2011 version from the Biomimicry Group [65] ...23
Figure 8: Schematic depicting the 13 archetypal claims found and analyzed in this
study. .................................................................................................28
Figure 9: Spectrum depicting the varying extent to which authors affirm the
archetypal claims found in BID literature study. ..............................29
Figure 10: Mindmap of ideation-related archetypal claims concerning benefits of
BID. ...................................................................................................31
Figure 11: “How problems are solved in (a) technology and in (b) biology” [71].42
Figure 12: Mindmap of optimization-related archetypal claims. ...........................45
Figure 13: All archetypal claims and sub-claims related to sustainability. ...........67
Figure 14: Comparison of carbon-dioxide equivalent emissions from Clark [183],
including those from camels and cows. ............................................79
Figure 15: Comparison of methane emissions from Wilkinson et al. [186], including
those from sauropods and cows. .......................................................80
Figure 16: Archetypal claims related directly to characteristics of BIDs. .............88
xviii
Figure 17: Overall research methodology for identifying sustainable design solutions
in existing BIDs. .............................................................................107
Figure 18: A snowball sampling search starting with the term “dolphin skin boat
hulls” is more likely to return results related to dolphins or boat hulls
than a randomly-selected and unrelated BID, like “gecko-inspired
adhesives.”. .....................................................................................111
Figure 19: Example GDG comparison. ...............................................................117
Figure 20: Trends related to the GDGs most frequently met better by the BIDs than
their competitors. ............................................................................126
Figure 21: Depiction of a potential design tool that could be used to find examples of
sustainable BIDs that meet a particular GDG. ................................152
1
Chapter 1: Introduction
Within the bodies of living organisms are multitudes of sustainable design
solutions that engineers have yet to master. Through the use of tailored sustainable
bioinspired design (BID) tools and methodologies, engineers could access and apply this
body of biological knowledge to reduce the environmental impact of engineering designs.
However, the underlying theory of BID must be more thoroughly fleshed out – and a
clearer understanding of the types of sustainability solutions present in biology must be
achieved – before such tools and methodologies can be developed. The goal of this thesis
is to tackle both issues and, consequently, lay the foundation for sustainable BID.
Chapter 1 provides the necessary background information and introduces this
effort. First, an overview of sustainable design, BID, and sustainable BID is provided,
with a discussion of the connection between biology and sustainable design and examples
of existing sustainable BIDs. Next, the motivation for both the theoretical and empirical
studies is presented. Finally, the organization of the thesis is detailed.
1.1 BACKGROUND
In this section, background information on sustainable design, BID, and
sustainable BID is provided. This includes a discussion of the literature connecting BID
and sustainability and a presentation of three examples of sustainable BIDs.
1.1.1 Sustainable Design
Human activity is dramatically changing the global environment [1].
Anthropogenic environmental changes harm other organisms [2,3], lower biology’s
ability to adapt to future evolutionary stresses [4], and reduce the quality of life for future
generations [5]. These changes are caused by a number of factors, including: (1) human
overproduction and overconsumption [6] and (2) poor design [7], or “the unintended
2
consequences of [human] activities as engineers” [8]. Environmentally sustainable
design, hereafter referred to as ‘sustainable design,’ is aimed at the second of these two
causes of anthropogenic environmental change and is focused on helping engineers lower
the environmental impact of their designs.
1.1.2 Bioinspired Design (BID)
BID is a design methodology that uses biological organisms as analogies for
engineered designs. Some authors have distinguished between different design
methodologies that incorporate biological analogies, using terms such as ‘bioinspired
design,’ ‘biomimicry,’ ‘bionics,’ and ‘biognosis’ to make these distinctions. Although the
differences between these terms may be important in some contexts, here they are
combined as they are in numerous popular [9,10] and academic sources [11-14], and all
are referred to as BID.
1.1.3 Sustainable BID
Many sustainable design solutions in biology are worth imitating. For instance,
spiders manufacture silk with desirable engineering properties at “close to ambient
temperatures and pressures using water as the solvent” [15]; vortices created when water
is ejected through the velum of jellyfish minimize energy consumption during swimming
[16]; the water-repellent surfaces of lotus leaves clean effectively without the use of
hazardous chemicals [17]; and the texture of shark skin reduces frictional drag [18]. The
imitation of solutions, such as these, in engineering design could contribute to the
development of products with reduced environmental impacts.
The process by which biological analogies are used to produce engineering
designs with lower environmental impacts is referred to here as sustainable BID.
3
Sustainable BID lies at the intersection of sustainable design and BID, drawing theories
and methodologies from both fields.
Figure 1: Sustainable BID lies at the intersection of sustainable design and BID. Photo
credits: [19,20].
1.1.4 Literature Connecting BID and Sustainability
A wide range of sources indicate that biological systems could be, and are being,
used as analogies in design to reduce the environmental impact of products. Both science-
related works for the general public and academic literature indicate this is the case.
Benyus states in Biomimicry: Innovation Inspired by Nature:
[L]ife has learned to fly, circumnavigate the globe, live in the depths of the ocean
and atop the highest peaks, craft miracle materials, light up the night, lasso the
sun’s energy, and build a self-reflective brain. Collectively, organisms have
managed to turn rock and sea into a life-friendly home.... In short, living things
have done everything we want to do, without guzzling fossil fuel, polluting the
planet, or mortgaging their future. What better models could there be? [21]
This message – that the biological world has something to offer to the sustainable design
community – is widely accepted by the non-academic community. The acceptance of the
message can be observed through its frequent repetition on science-related websites and
blogs, and in newspaper and magazine articles. Titles such as “Biomimicry Offers
4
Sustainable Solutions Inspired by Nature” [22] and “How Biomimicry Drives
Sustainability: From Fish-Inspired Wind Turbines to the Future of 3-D Printing” [23]
drive home this connection for the general public.
The connection between bioinspiration and sustainable design is also echoed in
scientific literature. For instance, Nagel states:
Biological organisms, phenomena and strategies… are exemplary systems that
provide insight into sustainable and adaptable design… engineers can not only
mimic what is found in the natural world, but also learn from those natural
systems to create reliable, smart and sustainable designs [14].
Additionally, journal articles such as “Bio-inspired Constructs for Sustainable Energy
Production and Use” [24] and “Sustainable and Bio-inspired Chemistry for Robust
Antibacterial Activity of Stainless Steel” [25] link BID to sustainability in their titles.
In a number of cases, sources define BID as being inherently linked to
sustainability. For instance, sources state that BID is “a design discipline that seeks
sustainable solutions by emulating nature’s time-tested patterns and strategies” [26], and
that BID “tak[es] inspiration from nature to create a product that’s friendly to the
environment” [22].
However, it is not safe to assume that all BIDs are sustainable by virtue of the fact
that they are bioinspired. Life cycle assessments of BIDs from Raibeck et al. [27] and
Reap et al. [28] have shown that BIDs are not sustainable by default, and that the entire
product life cycle must be considered to determine whether a particular bioinspired
feature will confer a sustainability advantage to a design.
1.1.5 Examples of Sustainable BIDs
A number of compelling examples are commonly cited when discussing the
environmental benefits of using biological analogies in the design process, such as the
5
cooling system in Eastgate Centre, the shape of the Daimler-Chrysler bionic concept car,
and the chemistry of self-cleaning thin films. These three examples will now be used to
illustrate the potential for sustainable BID.
Eastgate Centre is a shopping center and office building in Zimbabwe that has a
passive cooling system [29-32] inspired by cooling in termite mounds [30,33]. The
building and its biological analogy are depicted in the figure below. Instead of a
traditional industrial air conditioning system, which involves substantial equipment and
electricity consumption, Eastgate Centre achieves the same amount of cooling using only
fans [29-31], representing substantial energy savings [32]. This energy and equipment
reduction is possible because the geometry of the building promotes the flow of hot air
out of chimneys on the roof, drawing in cooler air at ground level [29-31], similar to the
way termite mounds remain cool throughout the day [34]. This passive cooling allows for
a substantial reduction in the amount of energy consumed by the building [32].
Figure 2: The energy efficient cooling system in Eastgate Centre (right) [35] is a
sustainable BID inspired by cooling in termite mounds (center) that replaces
a standard industrial air conditioner (left). Photo credits: [36-38].
Similarly, the bioinspired shape of the Daimler-Chrysler bionic concept car
confers an environmental advantage. The evolution of the car from the shape of the
6
boxfish is shown in the figure below. Surprisingly, the boxy shape of the appropriately-
named boxfish is aerodynamic, promoting the formation of favorable vortices that
stabilize the boxfish and result in energy savings during swimming [39,40]. Because the
Daimler-Chrysler concept car is shaped similarly, it experiences less drag [41] – and
consequently consumes less fuel – than a car with a standard profile.
Figure 3: Shape evolution from boxfish to car [40].
Finally, self-cleaning surfaces are another example of BIDs that have an
environmental advantage as a consequence of their bioinspired features. These surfaces,
and the lotus leaves that inspired them [42], are shown in the figure below. The self-
cleaning process in the lotus leaf occurs as result of its hydrophobic (water-repelling)
surface chemistry that causes water to bead on the leaf. When water beads, and
subsequently rolls off the surface of the leaf, debris on the surface is pulled into the bead
of water and rolls off as well [17]. When this surface chemistry is imitated on manmade
products, objects that would otherwise need to be cleaned using large volumes of
pressurized water and toxic chemicals can instead be cleaned using a small volume of
water spayed as a mist onto the part [27]. Consequently, less energy and water are
consumed [27,43], and the use of toxic and non-biodegradable materials is avoided.
7
Figure 4: Self-cleaning surface (left) inspired by the surface chemistry of the lotus leaf
(right). Photo credits: [44,45].
More detailed information from peer-reviewed sources and analysis of the
environmental impact of these three designs, and many others, can be found in
Appendices A-C.
1.2 THESIS MOTIVATION
While many sources proclaim the environmental benefits of BID, and while the
examples of sustainable BIDs are compelling, much analysis is lacking in existing
literature regarding the relationship between BID and sustainable design.
First, empirical evidence that the use of biological analogies produces
environmental benefits in general is lacking; there is no evidence to suggest that using a
biological analogy would always – or would even likely – result in more sustainable
aspects of a final design. Instead, there is evidence that the use of biological analogies in
design does not, as a rule, result in the reduced environmental impact of products [28].
Rather than necessarily having a smaller environmental impact than competitors by virtue
of the fact that they have a bioinspired feature, the examples of sustainable BIDs cited
above may be more sustainable than competitors by chance, just as designs developed
8
using analogies from other engineered products are sometimes more sustainable than
alternatives.
Second, sources touting the environmental benefits of BIDs rarely acknowledge
that these benefits are frequently one side of an environmental tradeoff, and are many
times necessarily paired with negative environmental impacts in other phases, or even the
same phase, of the product’s life cycle. For instance, self-cleaning surfaces reduce the
environmental impact during cleaning but are likely to increase the impact in
manufacturing [27].
Finally, the logic explaining why the use of biological analogies in the design
process would lead to more sustainable products, or to any other claimed benefit of BID,
is almost entirely absent from the literature, with the exception of vague references to the
evolutionary process, mention of nature’s ‘3.8 billion years of R&D’, or platitudes about
‘how magnificently efficient’, etc., nature is – without any insight into the details of what,
why, and how something is efficient, for example.
These three issues indicate a need, first, to develop the underlying theory of BID
and understand BID’s benefits, and second, to study why and how some biological
analogies have aided in the reduction of the environmental impact of products. Having
this knowledge would enable engineers to more effectively use biological analogies to
generate sustainable designs.
1.3 THESIS ORGANIZATION
This work is organized into two main sections: (1) a theoretical section analyzing
the claimed benefits of BID, and (2) an empirical section examining the ways in which
BID can be used to generate environmentally sustainable designs. Chapter 2 presents
necessary background information for both. It discusses two tools to understand and
9
measure the environmental impact of products - life cycle assessment (LCA) and green
design guidelines (GDGs). It also provides a discussion of previous research focused on
the analysis of many biological systems or BIDs together.
Section 1 seeks to answer the questions: In what sense is BID ‘beneficial’
compared to other ideation techniques? What desirable traits can be found in biological
organisms, and which of these traits transfer to BIDs? To what extent are BIDs and the
biological systems that inspire them ‘novel’, ‘optimized’, ‘efficient’, or ‘sustainable’?
The answers to these questions provide insight into the potential role of BID in improving
engineering designs. By qualifying and clarifying these claims in the context of
biological evidence, Chapters 3 through 8 contribute to the theoretical foundation for BID
and provide guidance to researchers developing design tools and methodologies to
enhance engineered products and systems using BID.
Chapter 3 presents the methodology of the theoretical study, along with an
overview of the claims identified and analyzed. Chapter 4 examines ideation-related
claims. Chapter 5 looks at optimization-related claims. Chapter 6 focuses on efficiency-
related claims. Chapter 7 considers sustainability-related claims, and Chapter 8
summaries the conclusions of the theoretical study.
The central question posed in Section 2 is: ‘What trends are present in existing,
sustainable BIDs?’ or, in other words, ‘When the use of a biological analogy has been
confirmed to have provided a true environmental advantage to a design, what types of
design features have been transferred?’ As will be discussed in Chapter 7, not all
desirable biological features can be transferred to engineering designs and retain their
desirable characteristics. Section 2 seeks to better understand the types of traits that do
indeed successfully transfer and result in an environmental impact reduction in the final
design.
10
Chapter 9 presents the research methods used in an empirical study aimed at
uncovering these sustainability-related trends. Chapter 10 contains the data collected in
the study and an analysis of the aspects of environmental impact that were reduced in the
sustainable BIDs. Chapter 11 discusses the overarching principles uncovered and the
types of characteristics that were observed to successfully transfer from biology to
engineering, along with an analysis of the prevalence of these characteristics in biology.
Chapter 12 concludes the section, presenting a summary of the findings and significance
of the study.
Chapter 13 presents a discussion of the thesis as a whole, particularly the ways in
which biology can provide insight into environmentally sustainable product design. It
presents potential avenues for future work that draw from both the theoretical findings of
Section 1 and the empirical results from Section 2, and concludes with a summary of the
contributions of the thesis.
11
Chapter 2: Literature Review
Chapter 2 delves into the tools and findings from both the sustainable design and
BID research communities. First, it presents an overview of two tools to measure the
environmental impact of products – life cycle assessment (LCA) and green design
guidelines (GDGs) – and provides an ethical framework for understanding environmental
impact. Second, it presents a discussion of previous work from the BID research
community, focused on the results of other authors’ analyses of many biological systems
or BIDs together and the abstraction of design principles from these analyses.
2.1 UNDERSTANDING AND MEASURING ENVIRONMENTAL IMPACT
A number of tools and findings from the sustainable design community related to
understanding and measuring environmental impact are brought to bear in this work,
especially those related to life cycle assessment (LCA) and green design guidelines
(GDGs).
2.1.1 Life Cycle Assessment (LCA)
Effective LCA tools and techniques quantify the environmental impact of a
product throughout its life cycle “from raw material acquisition through production, use,
end-of-life treatment, recycling and final disposal” [46]. ISO standards 14040:2006 and
14044:2006 address, respectively, the principles and framework of LCA, and the
requirements and guidelines for LCA [47]. These standards are intended to help
quantitatively assess and compare the environmental impacts of functionally-equivalent
competing products [46].
12
2.1.1.1 LCA Challenge #1 - Ethics and values introduce subjectivity.
One of the main challenges associated with LCA is that the outcome is influenced
by personal values during goal and scope definition [48,49], and in the weighting of
different types of environmental damages [3,46,50,51]. These value differences generate
a lack of consensus on how to properly conduct LCAs [50], which can lead to conflicting
results. Consequently, it is important to provide a basic explanation of the environmental
value system and ethical perspective adopted when conducting an LCA [48]. Other types
of tools that provide insight into the environmental impact of designs, such as GDGs,
likewise involve personal value judgments. Hence, although an LCA will not be
presented in this work, it is important to identify the ethical perspective and
environmental value system adopted here so that the analysis of environmental impact
using GDGs will be as transparent and objective as possible.
2.1.1.2 Environmental Ethics
The field of environmental ethics examines the moral and ethical role of the
environment [5,52,53]. One of the central points of contention among experts in this field
concerns whether the environment and non-human biological organisms are valued as
ends in themselves or only as a means for human benefit. The Stanford Encyclopedia of
Philosophy sets up this distinction as follows:
It is often said to be morally wrong for human beings to pollute and destroy parts
of the natural environment and to consume a huge portion of the planet’s natural
resources. If that is wrong, is it simply because a sustainable environment is
essential to (present and future) human well-being? Or is such behavior also
wrong because the natural environment and/or its various contents have certain
values in their own right so that these values ought to be respected and protected
in any case? [53]
13
The way one answers these questions can have a profound implication on how one
assesses the environmental impact of products through LCA and other environmental
assessment techniques.
Some widely-accepted documents indicate that the environment and biological
organisms should be valued as ends in themselves. For instance, The Earth Charter
states: “all beings are interdependent and every form of life has value regardless of its
worth to human beings” [6], and the preamble to the United Nation’s Convention on
Biological Diversity acknowledges “the intrinsic value of ecological diversity” [54].
However, most people in the Western world have adopted an anthropocentric
ethical perspective and do not accept that the environment has intrinsic value [5,53].
Consequently, many sources aimed at achieving scientific or political consensus present
an ethical perspective that focuses on the instrumental value of the environment for
human beings, i.e. the “ecological, genetic, social, economic, scientific, educational,
cultural, recreation, and aesthetic” value that the environment provides [54]. This
approach has been taken by a number of authors in science [5], government [4], and
international organizations such as the United Nations [54-56].
Because it is widely accepted that the environment possesses instrumental value
for humans, and because this stance on environmental ethics appears to be taken by many
authors aimed at impartiality, that perspective has been adopted here. This document
adopts an anthropocentric view of environmental ethics, and accepts that human beings
have moral obligations to avoid harming other human beings through negative
environmental impacts, while also accepting moral environmental responsibilities
towards future generations. The negative effects environmental change has on human
beings will be emphasized, and environmental changes that negatively affect other
14
organisms will be addressed in terms of how these changes negatively affect the benefits
humans glean from these organisms.
2.1.1.3 Environmental Impact Categories
Because different people have different opinions on how environmental
assessments should be scoped, it is also important to define what is meant by an
‘environmental impact.’ Here, the framework used to define environmental impact is
borrowed from a document [51] written by an international task force nominated by the
United Nations Environmental Program (UNEP) and the Society of Environmental
Toxicology and Chemistry (SETAC). It is intended to provide a common framework for
life cycle impact assessment that is universally accepted [51]. The paper relates
‘environmental impact pathways’ to ‘damage indicators’; this relation is shown in the
diagram below.
Figure 5: The relation of midpoint categories and damage indicators [51].
15
The ethical perspective adopted here focuses on the instrumental value of the
environment (including the biotic and abiotic natural environment, natural resources, and
the man made environment) and both the intrinsic and instrumental values of human life.
Hence, the understanding of environmental impact adopted here is the same as that
discussed in Jolliet et al. [51], with the exception that damages related to the intrinsic
value of the biotic natural environment and the abiotic natural environment (the fourth
and seventh column in the chart below, respectively) are not considered.
Table 1: LCA midpoint categories and damages to environment [51]
2.1.1.4 LCA Challenge #2 - Detailed data are needed.
A second main challenge associated with LCA is that a substantial amount of
detailed data concerning the product’s components, materials, and manufacturing
processes is needed for the analysis to be accurate [57]. As a consequence, it is difficult
to conduct LCA during conceptual design, when little detailed information about a design
16
is known. This requirement poses a major challenge for the field of sustainable product
design because most of a product’s environmental impact is determined during
conceptual design, when decisions are made regarding product performance and
materials [58], meaning that sustainable design techniques are most effective in the early
stages of new product design [59]. For example, a study of thirty companies showed that
those that implemented sustainable design practices before product specification were
able to see larger environmental impact reductions in their products than companies that
used sustainable design methods at a later stage in the design process [60].
2.1.2 Green Design Guidelines (GDGs)
It is critical to have tools to assess the environmental impacts of concepts during
the early phases of product design, so that more sustainable concepts can be selected.
Telenko [61] has compiled a list of 65 green design guidelines (GDGs) to help address
this problem. The GDGs are organized into six categories: (1) sustainability of resources,
(2) healthy inputs and outputs, (3) minimum use of resources in production and
transportation, (4) energy efficiency of resources during use, (5) the appropriate
durability of the product and components, and (6) disassembly, separation, and
purification [61]. The guidelines help designers think about all aspects of the life cycle
that could potentially generate an environmental impact, allowing them to make better-
informed design decisions concerning sustainability during conceptual design. A list of
these guidelines is provided in Appendix D.
The GDGs are similar to the midpoint categories presented in Jolliet et al. [51] in
that they look at a wide range of environmental impacts over the life cycle. However, the
GDGs are specifically focused on assessing the environmental impact of products, with
guidelines such as “GDG#6: specifying mutually compatible materials and fasteners for
17
recycling,” whereas the midpoint categories are more general, e.g. ‘Ozone depletion’.
Hence, the midpoint categories are more widely applicable, but they provide significantly
less guidance to designers working on specific problems.
Additionally, the GDGs do not define ‘environmental impact’ or explain how one
ought to measure environmental impact. For example, GDG #12: “Including labels and
instructions for safe handling of toxic materials” recommends that a designer consider
how toxic materials will be handled and how to communicate to the handlers what should
be done; it does not imply that the process of label-making and label-using is good for the
environment. Having labels (and instructions) in this instance is presumed to be better for
the environment because it is associated with ‘safer’ handling of toxic materials,
presumably equivalent to fewer harmful releases of toxic materials to the environment.
As in LCA, the GDGs must be interpreted using a definition of environmental
impact derived from personal value systems. For instance, GDG #12 does not define
‘safe’ handling of toxic materials. The dumping of materials toxic to humans in an area
where humans are likely to encounter the substance is presumably not ‘safe,’ but is it
‘safe’ to release materials that are toxic to ecosystems but nontoxic to humans? Is the
release of materials damaging to man-made devices but nontoxic to humans ‘safe’?
In the analysis in Chapter 10 of this thesis, the environmental impact of design
concepts are compared to one another using the GDGs and the modified interpretation of
‘environmental impact’ provided in the Jolliet et al. [51] paper. The use of this definition
coupled with the GDGs has a significant influence on the results of the empirical portion
of the study. For instance, noise is not explicitly accounted for in the GDGs, but it is
listed as a ‘midpoint category,’ thereby supporting the decision to account for noise from
the Shinkansen train as ‘noise pollution’ under GDG #8: “Installing protection against the
release of pollutants and hazardous substances,” even though the intent of the guideline
18
may have actually been directed at more traditional types of pollutants. This also comes
into play for products like Sharklet, whose prime environmental advantage is that it does
not contribute to the evolution of antibiotic-resistant bacteria. This type of environmental
impact falls under the midpoint category ‘Species and organism dispersal,’ but is not
directly addressed in the GDGs.
2.2 PREVIOUS WORK
In addition to the work discussed above focused on understanding and measuring
environmental impact, a number of studies from the BID research community are closely
related to the findings discussed throughout this thesis. Below, results from Wadia and
McAdams [62], Wadia [63], Vincent et al. [11], and Biomimicry 3.8 and its affiliated
organizations and founders [21,64,65], related to the discovery of trends in BIDs and
biological organisms, are presented. These findings will be referenced throughout this
thesis, particularly in Chapters 10 and 11, focused on the identification of sustainability-
related trends in existing, sustainable BIDs, where these findings serve to validate the
results of the empirical studies.
2.2.1 BID Design Principles and Guidelines
A 2010 paper from Wadia and McAdams [62] and Wadia’s 2011 thesis [63] both
present studies where 20 and 23 BIDs were analyzed, respectively, to “identify the
inherent characteristics that make the designs robust to their environment” and generate
biomimetic design guidelines [62]. The biomimetic design principles uncovered by
Wadia and McAdams [62] are presented in the table below.
19
Table 2: “Biomimetic design guidelines with examples of corresponding bio-inspired
characteristics and the percentage of reviewed products that display them”
from Wadia and McAdams [62].
Wadia [63] generated slightly different results, which are in the table below,
organized into what he refers to as ‘super groups’:
20
Table 3: Biomimetic design principles categorized into super groups from Wadia [63]
Some of the biomimetic design guidelines extracted in both studies provide
verification for the results of the studies presented in Chapters 10 and 11. Additionally,
Wadia’s thesis [63] analyzes 5 of the same BIDs analyzed in Section 2 of this work –
Eastgate Centre, the shape of the Daimler-Chrysler bionic concept car, the nose cone of
the Shinkansen train, the lotus-inspired self-cleaning surface, and the Shinkansen’s
pantograph. Hence, the notes and analysis from those works can be used as validation for
the analysis of specific designs, the results of which are presented in Chapters 10 and 11.
2.2.2 Design Principles in Biology
Additionally, a number of authors have either formally or informally studied
samples of biological organisms to extract trends or ‘design principles.’ Work from
21
Vincent et al. [11] and Biomimicry 3.8 and its affiliated organizations and founders
[21,64,65] is discussed below.
Vincent et al. [11] conducted a study comparing the principles illustrated by
problem solutions in 500 biological phenomena with those from TRIZ, and found that
there is only a 12% overlap between these principles in biology and engineering. They
also found that biological systems solve problems using information- and structure-based
solutions, whereas problems encountered in technology are typically solved though
energy manipulation [11]. This implies that mechanisms in biology may be less likely to
solve problems with the use of energy than typical engineering designs.
Additionally, organizations and people connected to what is currently called
Biomimicry 3.8 have released a number of non-academic publications with varying
accounts of biological design principles. Three such accounts are presented below and are
of particular interest because Biomimicry 3.8 is also focused on the development of
sustainable design solutions through the use of biological analogies [66].
Benyus, co-founder of Biomimicry 3.8, details “a canon of nature's laws,
strategies, and principles” in her influential 1997 book Biomimicry: Innovation Inspired
by Nature [21], encompassing the following nine items: (1) “Nature runs on sunlight”; (2)
“Nature uses only the energy it needs”; (3) “Nature fits form to function”; (4) “Nature
recycles everything”; (5) “Nature rewards cooperation”; (6) “Nature banks on diversity”;
(7) “Nature demands local expertise”; (8) “Nature curbs excesses from within”; and (9)
“Nature taps the power of limits” [21]. It is not clear how she arrived at this list; she
states only that it was “divine[d]” from the notebooks of ecologists [21].
Additionally, two more recent versions of a list of traits found in biology, known
as “Life’s Principles” – a 2009 version from the Biomimicry Guild [64] and a 2011
version from the Biomimicry Group [65] – are provided below.
23
Figure 6: Life’s Principles, the 2011 version from the Biomimicry Group [65]
Some of the principles put forth in Biomimicry 3.8-affiated documents agree with
the results presented in Chapters 10 and 11 of this work and will be discussed further
there.
24
2.3 CONCLUSION
Chapter 2 has provided a wide range of background information concerning the
understanding of ‘environmental impact’ adopted here, and the measurement of
environmental impact using LCA and GDGs. Additionally, an overview of related work
that identified design principles in BIDs and biological organisms was provided. Now
that this background information is in place, it is possible to shift the focus towards
Section 1, which presents a theoretical study of the potential benefits of BID.
25
Chapter 3: Theoretical Study Overview
Chapter 3 introduces Section 1 and the theoretical study of BID benefits. It
presents an introduction to the BID benefits study, the methodology of the study, and an
overview of the claims identified and analyzed.
3.1 INTRODUCTION TO BID BENEFITS STUDY
Many academic and non-academic sources include accounts of the benefits of
BID. These accounts invoke a small set of claims that recur throughout the literature,
concerning the characteristics of BIDs and the biological systems that inspire them.
Below are four such accounts found from academic sources, provided to show the
diversity of benefits cited. These and 25 other accounts that provide an extended
explanation of the benefits of BID are listed in and are identified with an asterisk
Appendix E.
1. Nagel et al. [67] in the Journal of Mechanical Design state:
The designs of the biological world allow organisms to survive in nearly all of
earth’s challenging environments filling niches from under-sea volcanic vents,
tundras both frozen and desolate, poisonous salt flats, and deserts rarely seeing
rain. Nature’s designs are the most elegant, innovative, and robust solution
principles and strategies allowing for life to survive many of the earth’s
challenges. Biomimetic design aims to leverage the insight of the biological world
into the engineered world.
2. Wilson and Rosen [12] in IDETC/CIE 2007 claim:
With design, engineers strive to produce more economical and efficient solutions
to problems. The duality between engineering and biological systems exists in the
pursuit of this efficiency. Nature has been on this search for many, many years. In
order to survive, natural systems must be efficient, using minimal amounts of
energy as a source for efficiency. In nature, where the fittest survive, all
organisms compete with each other for available energy.
26
3. Ball [68] in Nature explains:
[N]ature does not employ exotic materials, nor extreme energies or high
pressures. The living world comes almost with a guarantee of economy, for that is
evolution’s exigency. Maximum return for minimal (metabolic) outlay: this is the
stipulation that keeps nature lean and, in some sense, optimal.
4. Finally, Bar-Cohen [69] in Biomimetics: Biologically Inspired Technologies
maintains:
After billions of years of evolution, nature developed inventions that work, which
are appropriate for the intended tasks and that last. The evolution of nature led to
the introduction of highly effective and power efficient biological mechanisms.
Failed solutions often led to the extinction of the specific species that became a
fossil. In its evolution, nature archived its solutions in the genes of creatures that
make up the terrestrial life around us. Imitating nature’s mechanisms offers
enormous potentials for the improvement of our life and the tools we use…
Benefits from the study of biomimetics can be seen in many applications,
including stronger fiber, multifunctional materials, improved drugs, superior
robots, and many others.
In Section 1, a study examining such accounts is presented. As can be seen from
the examples above, there is a wide range of claimed benefits authors make on behalf of
the BID process – everything from leveraging the innovative and lasting solutions found
in biology to assisting in developing efficient and multifunctional engineering designs. It
will be shown that upon a deeper inspection of the literature, some of these claims only
hold true in some instances and are disputed within the BID research community. The
results of this study provide insight into the potential of BID and, hence, guidance to
researchers working to develop tools and methodologies for BID.
3.2 METHODOLOGY FOR BID BENEFITS STUDY
Accounts of the benefits of BID from 128 different sources – 114 academic and
14 non-academic – were identified in BID literature and grouped. The accounts represent
the work of 257 different authors, published in 17 journals, 4 conferences, 14 academic
27
books, and 14 non-academic sources. A list of all sources analyzed in this study is
provided in Appendix E. Numerous other sources were also consulted, but were not
directly included in the study. Sources were selected for use in the study when a claim or
explanation of the benefits of BID was found, by chance, in the literature. Many sources
come from the same special issue journals, conferences, and compilation books focused
on BID.
Different sources written by the same author were analyzed separately. Hence,
large numbers of sources containing a particular claim likely indicate that the claim is
widely held and/or is considered important by a small minority of prolific authors. Either
case was deemed sufficient to justify examining the claim in further detail.
Effort was made to ensure a broad search scope by including a wide range of
academic publications and authors. However, no effort was made to select sources
randomly or methodically. Consequently, claims that recur frequently in the study by a
wide range of authors are likely to be pervasive in the field in general, but the ratio of the
number of sources that make a particular claim to the total number of sources analyzed is
unlikely to be numerically representative of the field.
3.3 RESULTS OVERVIEW
Quotations from the accounts were grouped according to meaning into 13
archetypal claims, organized into four groups, as shown in the figure below. These
archetypal claims are the most generalized, confident versions of the claims authors make
when referencing a particular benefit to BID. All of the other claims studied were either
variations of these archetypal claims or particular instances of them.
28
Figure 8: Schematic depicting the 13 archetypal claims found and analyzed in this study.
There is substantial variation in the degree to which authors support the
archetypal claim from which their claim is patterned; this variation is expressed through
differences in the confidence and specificity levels of the claim-related quotations. The
spectrum of affirmation of the archetypal claims is depicted in the figure below with
examples seen in this study. On one end of the spectrum are highly-confident
generalizations about biological systems or BIDs that indicate a high level of agreement
with the archetypal claim in question; at the other are tentative examples of one possible
29
instance of the archetypal claim, indicating a low level of confidence in the archetypal
claim. [70]. [71]. [72]. [73].
Figure 9: Spectrum depicting the varying extent to which authors affirm the archetypal
claims found in BID literature study.
This variation indicates a rather large degree of disagreement or uncertainty in the
BID field. What level of specificity is needed to accurately describe beneficial
characteristics of biology and BID? How should generalizations regarding beneficial
traits in biology and BID be qualified?
The answers to these questions play a role in the development of tools and
methodologies to improve engineered designs through BID. For instance, if it is true that
‘BIDs are always efficient’, new tools and methodologies are unnecessary, and standard
BID tools are sufficient to guarantee efficient designs. On the other hand, if (1) BIDs are
only more likely to be energy efficient than a non-BID if they very closely imitate energy
efficient mechanisms in biology, and (2) energy efficient mechanisms in biology are
more likely to arise in situations where there is strong selection pressure on organisms for
internal metabolic efficiency, then (3) tools and methodologies should be developed to
hone in on biological analogies found in organisms with strong selection pressure for
30
internal metabolic efficiency and to assist in the direct transfer of the efficiency-related
characteristics to engineering.
3.4 CONCLUSION
Chapter 3 presented an introduction to the BID benefits study, the methodology of
the study, and an overview of the claims identified and analyzed. The 13 archetypal
claims identified were grouped into four categories: those related to ideation,
optimization in biology, sustainability in biology, and characteristics of BIDs themselves.
Each of these categories will be analyzed separately in the four following chapters, where
the archetypal claims will be unpacked, interpreted, and discussed using the support of
textbooks and peer-reviewed research from biology and BID. As a result of this analysis,
many of the claims are qualified and explained, providing insight into the development of
future BID tools and methodologies.
31
Chapter 4: Ideation-Related Archetypal Claims
Five ideation-related archetypal claims are commonly referenced in the literature.
These claims are shown in the mindmap in the figure below. One of the claims directly
relates to the results of the BID ideation process; the other four concern characteristics of
biology. Two of the biology-related traits – quantity and variety – are metrics commonly
used to measure the results of ideation techniques; concept generation methods that result
in a greater variety and number of ideas are considered superior to methods that produce
similar or fewer ideas. It is not immediately clear, however, what advantage is conferred
to the design process when the field of potential analogies is varied and numerous,
instead of the pool of concepts generated. The other two biology-related traits concern the
characteristics of biological systems that make them relevant to engineering design
problems and may cause the results of BID to be different than the results of other
design-by-analogy techniques. Each archetypal claim will be discussed in detail in this
chapter.
Figure 10: Mindmap of ideation-related archetypal claims concerning benefits of BID.
4.1 BID HELPS DESIGNERS GENERATE NOVEL IDEAS.
26 sources out of 128 claim that novel, creative, innovative and/or new ideas
result from bioinspired ideation. 14 sources refer directly to the ‘novelty’ of ideas, 5 to
‘new’ ideas, 4 to ‘creative’ ideas, and 10 to ‘innovative’ ideas, through statements such
as: “[B]iology has created and continues to create effective solutions that offer great
32
models… as inspiration for novel engineering methods, processes, materials, algorithms,
etc.” [69]; “[B]iology, bionics, and related fields offer rewarding new insights to
designers” [74]; “[U]nique creative engineered solutions can be generated through
functional analogy with nature” [67]; and “It is evident that nature can inspire innovative
engineering designs” [75].
These claims are grouped and discussed together as the archetypal claim
‘Biological analogies help designers generate novel ideas,’ because each of the claims
has related meanings to that effect and because the supporting evidence for these claims
is the same. Many of these terms are considered synonymous in a broader, non-technical
context, and an examination of the technical definitions of ‘new,’ ‘creative,’ and
‘innovative’ indicates that most sources consider these terms to be either equivalent to, or
subsets of, ‘novel’ concepts. Although frequently the terms ‘novelty,’ ‘newness,’
‘creativity,’ and ‘innovation’ are distinguished from each other within engineering design
literature, generally-accepted technical definitions of a number of these terms remain
“elusive” [76].
Novelty is defined as “a measure of how unusual or unexpected an idea is as
compared to other ideas” [77]. Innovative ideas are either regarded as a subset of creative
ideas that are useful and feasible [78], or they are regarded as a subset of novel ideas
[76]. Similarly, creative ideas are either considered a subset of novel ideas that are
valuable [79], or they are considered synonymous with novel ideas, because creative
ideas are the ideas that are outcomes of creativity and creativity is “a process to evaluate
a problem in an unexpected or unusual fashion in order to generate ideas that are novel”
[78]. Finally, new ideas are either considered synonymous with novel ideas, or they form
a broader category that is not necessarily associated with characteristics desirable for
ideation: “Not every new idea is novel since it may be considered usual or expected to
33
some degree and this is only known after the idea is obtained and analysed” [77]. For the
sake of simplicity, here it is assumed that claims related to new ideas are using the term
‘new’ as a synonym for ‘novel.’ If this were not the case, the only implication would be
that claims related to new ideas would not represent an actual benefit to designers.
Because of their similarities, novel, new, creative, and innovative ideas are all discussed
under the more general umbrella term ‘novel.’
Upon inspection of the literature, it appears that the use of biological analogies in
ideation does indeed help designers generate novel ideas. Wilson et al. [80] found that
designers who used biological analogies in ideation had an increase in the novelty of their
ideas compared to a control group. Additionally, design-by-analogy in general has been
shown to increase the novelty of ideas. Design-by-analogy is a concept generation
technique where designers are primed with visuals and/or text prior to ideation. BID is
one example of a design-by-analogy approach. The primes used in design-by-analogy
encourage designers to think differently and can help solve design problems. The benefits
of design-by-analogy in ideation are well-studied and include the ability to generate “new
relevant structures” [81], enhance creativity during concept generation [82], help
designers develop concepts that are “high quality and novel” [83], and enhance
“innovation” [84].
However, BID is just one of many types of design-by-analogy, meaning these
novelty-related benefits are not unique to BID. In the conclusion of their 2010 paper,
Vattam et al. [85] state that it is an “open question” how analogies from BID differ from
other types of analogies. Virtually anything could be used as analogy by a designer, such
as frequently-used patents and biological systems, but also many less-frequently
discussed potential analogies from anthropology, geology, astronomy, art, and literature,
meaning there is a broad range of potential design-by-analogy processes. While many of
34
these processes are discussed less frequently in design literature than BID, theory related
to design-by-analogy approaches suggests that they would share some of the same
ideation benefits as BID.
Many of these less-commonly discussed design-by-analogy techniques are being
used. For instance, a study from Casakin et al. [81] involved three architectural design
problems where participants were shown “images from the architectural design domain…
as well as images from remote domains… like art, engineering, nature and science.”
Additionally, there is a fair amount of discussion on design inspired by science fiction.
For instance, Vincent and Mann [86] describe science fiction as “a fertile source of ideas
for both technology and TRIZ,” and a news article from NASA explains how the space
elevator concept was “inspired partly by science fiction,” from sources such as Arthur C.
Clark’s book Fountains of Paradise [87].
However, some design researchers argue that the use of biological analogies has
two benefits in ideation above those of typical design-by-analogy approaches. First, some
authors maintain that BID is less prone to design fixation than other design-by-analogy
methods. “Design fixation refers to design conformity that results from exposing
designers to example solutions” [80], resulting in a reduced variety of ideas. Design-by-
analogy has been shown to have negative effects in ideation related to design fixation
[80,83]. Design fixation has also been shown to be a problem in BID: “[N]ovice
designers tend to fixate on irrelevant aspects of biological information” [88]. Mak and
Shu [89,90] have observed issues with fixation on elements of the biological analogy
description and fixation on applying the biological strategies to develop a specific type of
solution during BID. However, design fixation may be less of a problem in BID than in
other design-by-analogy approaches. A study examining the effect of biological analogies
on ideation conducted by Wilson et al. [80] found that participants who used biological
35
analogies and human-engineered analogies both had increases in the novelty of their
ideas, but also that the decrease in variety of design ideas that occurs as a result of using
an analogy from engineering did not occur with biological analogies. Hence, it appears
that BID has the novelty benefits associated with design by analogy without some of the
common drawbacks, such as reduced variety of ideas. However, further research is
needed to confirm these results.
Second, some authors argue that BID is more likely to produce novel ideas
because biological analogies are more likely to be far-field analogies than alternatives.
Some authors, such as Wilson et al. [80], claim that biological analogies are likely to be
far-field because biological organisms share few surface-level attributes with engineering
designs. Numerous previous studies have indicated that far-field analogies – analogies
that come from a domain substantially different from the target domain [91] – promote
novelty [83] and creativity [92] in concepts generated. A number of authors have agreed
[84,89-91,93,94]. However, this novelty comes with a price; new research from Fu et al.
[95] indicates that far-field analogies may be problematic because they are more difficult
to transfer to engineering design, and that mid-field analogies actually result in the best
concepts generated.
Ultimately, using biological analogies during ideation improves the novelty of
concepts generated compared to a control group. This represents a true advantage over
standard ideation techniques, but not over other design-by-analogy approaches, for which
these improvements in novelty are also expected. However, BID may be less prone to
cause design fixation than patent-based design-by-analogy techniques, although more
evidence is needed. Additionally, BID may be more likely to produce novel concepts
than alternative methods of design-by-analogy because biological organisms share few
surface-level attributes with engineering design problems, and consequently a reduced
36
incidence of design fixation. However, the lack of surface-level similarities also means it
is more difficult for engineers to transfer the information from the biological analogy to
the engineering domain.
4.2 QUANTITY: BIOLOGY CONTAINS MANY POTENTIAL ANALOGIES.
20 out of 128 sources claim there are many potential analogies in biology. Sixteen
sources make general statements, such as: “The natural world offers a wealth of potential
design solutions that can be applied to engineering problems” [96]; and “The natural
world provides numerous cases for analogy and inspiration in engineering design” [97].
Additionally, four sources reference specific types of functions that are performed in
many different ways by nature, such as the great number of “specialized sensing tasks”
performed by biological sensors [98]. Having a large number of biological species may
appear advantageous to BID researchers because larger numbers of potential analogies
may make it more likely to find an analogy that is relevant to a particular engineering
problem.
When examined using biological literature, it is clear that there are numerous
potential analogies in biology; however, many of these designs are currently inaccessible
to engineers. “As many as 30 million species of organisms may exist on Earth today”
[99], but in 1988 only 1.5 million species had been discovered and studied by biologists
[100]. This issue has been discussed by authors in BID. For instance, Gorb et al. [101]
mention that only a few adhesive systems have been studied and modeled from the pool
of one million insect species recently known to science. However, there are many
elements of any particular species that could be used as potential analogies – surface
textures, shape of body parts, behaviors, etc. Hence, while there are many species in
37
biology, few can actually be used by engineers. However, the ones that are accessible can
be used in a wide range of ways by engineers.
On the basis of sheer numbers of potential analogies alone, it is unclear what
advantage BID has over other design-by-analogy techniques, patent searches in
particular. According to data from the World Intellectual Property Organization [102], an
agency of the United Nations, approximately 36 million patents applications were filed
worldwide between 1985 and 2011, with 2.14 million filed in 2011 alone. A book
published in 1988 states: “In the United States alone more than 4.7 million patents have
been issued since 1790. If each of these patents is counted as an equivalent of an organic
species, then the technological can be said to have a diversity three times greater than the
organic” [100].
Ultimately, biology does indeed have a very large number of accessible potential
analogies to be used in engineering, despite the fact that only a small percentage of
existing species have been discovered and studied. However, more potential analogies
can be found in engineering. Hence, the great number of potential analogies is a benefit
of BID, but it is not an advantage over existing design-by-analogy techniques that use
patents.
4.3 VARIETY: BIOLOGY IS DIVERSE.
18 of 128 sources appeal to the archetypal claim that ‘biology is diverse’, though
statements such as: “Organisms have evolved an immense variety of shapes and
structures” [103]; “Biological systems which share common structural or functional
principles may come in a large number of variations that almost always exceeds what is
seen in man-made devices by a large margin” [104]; “There is a great diversity in
properties and structures across hard biological materials, from which engineers can ‘tap’
38
for inspiration” [105]; and “With… seemingly simple molecules, natural processes are
capable of fashioning an enormously diverse range of fabrication units” [106].
Diversity in biology is a potential benefit to practitioners of BID if it means that
designers will be more likely to find an analogy relevant to their design problem.
Additionally, if it appears that solutions in biology are more diverse than those in
engineering, there may be an advantage to using biological analogies in those cases
instead of engineered designs because the likelihood of finding a relevant analogy is
higher.
Upon inspection of biological and BID literature, it indeed appears that biology is
diverse. Biological organisms have an enormously broad range of traits and are able to
live in nearly every environment on earth. For instance, a wide range of bacteria and
microscopic plants and animals live in Antarctic sea ice [107], in environments as hot as
113°C [108], and in extreme chemical environments, such as those “contaminated with
toxic metal ions” [109]. Biological diversity arose, in part, as a result of species adapting
to a wide range of different environments. For instance, the evolution of vascular plants
over the past 430 million years “in dramatically different environments over that time
resulted in the formation of an impressive variety of forms and attributes, in a global
diversity that today consists of approximately 260,000 species” [110].
It is unclear, however, whether biology or engineering is more diverse. Vincent
and Mann [86] have observed qualitatively that biological solutions for the problem of
joining two elements are “much more varied” than engineering solutions. However,
Basalla [100] claims that the same level of diversity is also present in engineering
solutions: “The variety of made things is every bit as astonishing as that of living things.
Consider the range that extends from stone tools to microchips, from water wheels to
spacecraft, from thumbtacks to skyscrapers” [100].
39
Ultimately, it appears that there is indeed a great deal of diversity in biology,
meaning many different types of analogies may be found to improve engineering designs,
and the likelihood of finding a relevant biological analogy for a particular problem is
high. However, it is unclear whether there is greater diversity in biology or engineering
and, hence, whether one is more likely to find a relevant analogy to a particular problem
in the population of accessible biological analogies or in the population of patents.
4.4 RELEVANCE: BIOLOGY SOLVES PROBLEMS ENGINEERS WOULD LIKE TO SOLVE.
At least 44 of 128 sources appeal to the archetypal claim that ‘biological systems
solve problems engineers would like to solve’ through statements such as: “[T]hrough
biological and biochemical systems, many of the same problems mankind faces have
been met and solved” in nature [74]; and “Natural systems often solve problems in
adequate, not optimal or maximal ways. However, even ‘adequate’ designs can be an
important and revolutionary source of inspiration for problems we are trying to solve”
[111]. Authors likewise admire a wide range of biological phenomena engineers have yet
to imitate, including “the low friction coefficients in many natural systems” [112]; “how
basilisk lizards walk on water … how penguins minimize drag… and how insects
manage to remain airborne” [113]; the adaptability, multifunctionality, and scalability of
biological materials, as well as “their unique combinations of stiffness and strength”
[105]; and “hydrophobicity, wind resistance, self-assembly, and harnessing solar energy”
[9], among many other features.
This archetypal claim may be one of the most oft-cited reasons for conducting
BID. At the beginning of this study, this claim was not recognized as being of interest
and instances of this claim were not always recorded. Hence, there are likely more than
44 quotes to this effect in the 128 sources studied.
40
The claim ‘Biology solves problems engineers would like to solve’ indeed
appears to hold true. The first part of this claim ‘Biology solves problems’ is essentially
the same as the claims ‘Biology works’ or ‘Biology performs functions’. It is clear that
biology does indeed successfully perform a vast array of functions. The overall
archetypal claim – that the solutions found in biology are of interest to engineers – is also
likely true, since the authors making this statement are frequently also practitioners of
BID. Through their existence, biological systems prove to engineers that it is possible to
perform a particular function and provide an example of a mechanism or problem-solving
approach that works.
Of course, the process by which one learns from biological examples to create a
design in engineering is not without difficulty; authors discuss challenges faced by
engineers because of their limited knowledge of biology [94,114], the need for a more
systematic method of BID [115], and difficulties arising from “copying nature” as
opposed to “using nature as inspiration” by using “its principles to invent far more
effective solutions” [69].
Ultimately it appears that biology does indeed solve a vast array of design
problems and that the design solutions found in biology are of interest to engineers,
despite the challenges engineers may face in trying to implement similar solutions in
engineering designs.
4.5 BIOLOGY SOLVES PROBLEMS DIFFERENTLY THAN ENGINEERING.
Seven out of 128 sources claim that biological systems solve problems differently
than engineering. Five sources make general statements, such as: “nature copes and
invents in a way fundamentally different from what we do” [116]; “evolution produced
sophisticated properties and structures which rarely overlap with methods and products made by
41
man” [117]; “when performing the same task as an organism, humans can often use very
different strategies, for example, aerofoil wings versus flapping wings to achieve flying”
[118]. Additionally, five sources give specific examples of differences between
engineering and biological solutions, such as: “We build dry and stiff structures; nature
mostly makes hers wet and flexible… Our engines expand or spin; hers contract or slide.
We fabricate large devices directly; nature’s large things are cunning proliferations of
tiny components” [116].
A limited amount of BID literature supports the claim that solutions in biology
and engineering are fundamentally different. For example, a study from Vincent et al.
[11] comparing the principles illustrated by problem solutions in biology and
engineering, found, using analysis from TRIZ, that there is only a 12% overlap in these
principles and that biological systems are more likely to solve problems using
information- and structure-based solutions, whereas problems encountered in technology
are typically solved though energy manipulation. Additionally, Vincent [71] generated a
plot showing the differences in the solutions found in biology and engineering at different
length scales, reproduced below. As can be seen from the visual differences in the two
charts in Figure 11, there appears to be a significant difference in the manner in which
problems are solved in biology and engineering.
42
Figure 11: “How problems are solved in (a) technology and in (b) biology, showing all
possible problems (vertical axis) and size range (horizontal axis). While
70% of the technical solutions involve manipulation of energy (amount,
source, type, etc.), the use and manipulation of information, from DNA to
pheromones is most important in biology” [71].
Of course, some sources appear to disagree with the claim that biology and
engineering have fundamentally different types of solutions, emphasizing instead the
similarities between biology and engineering. For instance, Nagel et al. state: “Biological
organisms operate in much the same way that engineered systems operate; each part or
piece in the overall system has an intended function. Function thus provides a common
ground” [119]. However, there is little, if any, evidence in biological and BID literature
43
refuting the empirical differences uncovered in the studies by Vincent and Vincent et al.,
discussed above.
If biological mechanisms truly differ fundamentally from those in engineering,
using biological analogies in ideation would give different results than ideation using
results from a patent search, potentially offering an advantage over just using analogies
found from patent search, or possibly even an advantage over patent-based analogies.
Currently, there is some authoritative literature from the BID community supporting the
claim that biology and engineering are fundamentally different, as discussed above, but
further work is needed to confirm these results and to see if this does indeed result in
further advantages for the BID process.
4.6 CONCLUSION
BID does indeed help designers generate novel ideas. There is significant
evidence indicating that using biological analogies in concept generation produces more
novel concepts than standard concept generation techniques. However, the same is true
for other design-by-analogy techniques, such as those that use patents as analogies. Some
evidence suggests that biological analogies may be less likely to prompt design fixation
than patents, but they may also be more difficult to understand and translate to a new
engineering design than information in patents.
It is also the case that biology contains many potential analogies. Ultimately,
biology does indeed have a very large number of accessible potential analogies to be used
in engineering, despite the fact that only a small percentage of existing species have been
discovered and studied. However, more potential analogies can be found in engineering
patents. Hence, the great number of potential analogies is a benefit of BID, but it is not an
advantage over existing design-by-analogy techniques using patents.
44
Additionally, according to the engineers who make this claim, biology contains
solutions relevant to the problems engineers want to solve.
Ultimately, it appears that there is indeed a great deal of diversity in biology,
meaning many different types of analogies may be found to improve engineering designs,
and the likelihood of finding a relevant biological analogy for a particular problem is
high. However, it is unclear whether there is greater diversity in biology or engineering
and, hence, whether one is more likely to find a relevant analogy to a particular problem
in the population of accessible biological analogies or in the population of patents.
Some preliminary evidence exists suggesting biological mechanisms differ
fundamentally from those in engineering. If true, this may represent an advantage of BID
over only using analogies found from patent search, or possibly even an advantage over
patent-based analogies. However, further work is needed to confirm these results and to
see if this does indeed result in advantages for BID.
45
Chapter 5: Optimization in Biology
38 sources reference the claim ‘Biology is optimized’ through statements such as:
“Nature solves complex real-world problems by maximizing fitness via natural selection.
We see the end product of this optimization in biological structure and function” [120];
“Evolution and natural selection has led to optimized and highly robust biological
systems” [62]; and “Generation of design in natural systems (geometry, pattern, form,
and texture) is a holistic phenomenon that synchronizes all design constituents toward an
overall optimized performance envelope” [121]. These sources also provide specific
examples of optimized biological systems, such as the magnetic properties in
magnetotactic bacteria [122], the nozzle diameter in the ‘combustion chamber’ for the
bombardier beetle [123], and the morphology of flying animals [124].
Quotations from accounts that referenced ‘optimization in biology’ were grouped
into three archetypal claims: (1) Biology is optimal; (2) Biology is optimized by
evolution via natural selection; and (3) Biology is optimized for efficiency – 21 sources.
Claims 1 and 2 are two different possible interpretations of statements related to
‘optimization in biology’ in general and are not associated with a corresponding
quotation count because it is often ambiguous which interpretation is best aligned with
the authors’ intent. These claims are depicted in the figure below.
Figure 12: Mindmap of optimization-related archetypal claims.
46
Additionally, a set of concepts related to optimization in biology were frequently
referenced: (1) Evolution – 37 sources, (2) Natural selection – 9 sources, (3) Evolution as
research and development – 3 sources, (4) Evolution as experimentation – 6 sources, (5)
Evolution as trial and error – 5 sources, (6) Evolution has been occurring longer than
engineers have been developing products – 4 sources, (7) Niches – 6 sources, (8)
Evolution over millions of years – 15 sources, (9) Evolution over billions of years – 25
sources, (10) ‘Fossils are failures’ – 8 sources, and (11) Biology is adaptable – 8 sources.
5.1 BIOLOGY IS OPTIMAL.
References to optimization in biology may mean ‘biology is optimal’ or
‘organisms are perfectly suited to their environment.’ The following quotations seem to
refer to optimization in biology in this sense: Biological “structures have evolved in
nature over eons to the level of seamless integration and perfection with which they serve
their functions” [125]; “The highly specific control of morphology, location, orientation
and crystallographic phase all indicate the existence of an optimized or ‘engineered’
substrate surface” [126]; and “The numerical simulations show that the nozzle diameter
in bombardier beetles appears to be at an optimum value” [123].
However, a number of sources in BID literature disagree. Bar-Cohen [69,127]
claims organisms do not necessarily exhibit optimal performance because they only need
to survive long enough to reproduce. Likewise, Ball [68] describes nature as “lean and, in
some sense, optimal” but makes it clear that biological organisms are not optimized from
an engineering perspective: “The complex of compromises that shape the fitness
landscape of evolution is likely to bear only incidental correspondences to that which
determines the contours of technological and economic viability.”
47
Upon inspection, it is evident that biological organisms are not perfect or
‘optimal’ for four reasons.
First, biological organisms are not ‘optimal’ because many organisms have
vestigial structures that have lost all or most of their historical function. “Vestigialization
begins when a trait is rendered nonfunctional, or becomes a selective liability outright,
due to shifts in the environment. The feature then atrophies over time” [128]. Examples
of vestigial structures include “simplified morphology of parasitic animals, reduced
number of digits in horses, loss of limbs in snakes, the vermiform appendix and coccyx
of humans, vestigial wings of flightless birds, eye and pigment loss of cave-dwelling
organisms” [128] and the hindlimbs in the ancient whale Basilosaurus [129]. Optimal
organisms would not possess functionless features.
Second, biology is not ‘optimal’ because mutations have not arisen to produce all
possible phenotypes, including those that would be extraordinarily beneficial. It is
apparent from studies of species morphology “that forms generated during evolution fall
into distinct, not continuous, classes” [130]. Consequently, traits that would increase
fitness may not be present, and it is not always possible for the evolutionary process to
arrive at the optimal solution. For example, “In the seedcracker, bills of a particular size
have a genetic basis. In experimental crosses between two birds with the two optimal bill
sizes, all offspring had a bill of one size or the other, nothing in between” [131]. If a mid-
size bill were optimal in some environment, the seedcracker as it currently is would not
be able to evolve to be optimal because the genes to produce the optimal phenotype are
not possible. An optimal organism would have the best of all possible features, which
existing organisms do not have.
Third, biology is not ‘optimal’ because not all combinations of traits are possible,
including desirable ones. In some cases, this is because some traits share development
48
pathways that cause them to be inherited together [132]. For instance, “[i]n several
species of poeciliid fish… the process of maturation is governed by an endocrine
pathway that reduces growth rate as it accelerates sexual development,” meaning “the
genetic variation for the combination of large size and rapid maturation is not
immediately available” [132]. In other cases, not all combinations of traits are possible
because of the physical realities of the existing organism. For instance, in a section titled
“Why Natural Selection Cannot Fashion Perfect Organisms” Campbell and Reece state:
“[N]ature abounds with organisms that seem to be less than ideally ‘engineered’ for their
lifestyles”; they provide the example of bird species that might benefit from having four
legs instead of just two, which is not possible because the two limbs evolved to be wings,
leaving only two limbs to remain as legs [133]. An optimal organism would have the best
of all possible combinations of features, which existing organisms do not have.
Finally, biology is not ‘optimal’ because the environment is constantly changing,
making it impossible for biological organisms to be perfectly suited for their environment
at all times. Unlike an engineering optimization problem with a fixed set of constraints
and a fixed global optimum, the environment in the biological world is constantly
changing. Consequently, what qualifies as ‘the optimum’ in biology is a “moving target”
[134], and ‘the fittest’ individuals are “those best adapted to existing conditions at a
particular historical moment in a specific environmental context” [135]. Hence, while
natural selection processes may ‘optimize’ biology, as discussed in the following section,
and favor a particular trait at one point in time, it can later ‘optimize’ and disfavor that
same trait in the same population, solely in response to changing environmental
conditions. Accordingly, if the evolutionary process is one of optimization, there is no
fixed goal to the process, and hence there is no single global optimum to approach. If the
environment were unchanging over many generations, perhaps organisms would begin to
49
approach the ‘optimum’ associated with that environment, but this type of optimization is
not possible in a changing environment. An ‘optimal’ organism should be optimal for all
time, not just ‘optimal’ today and ‘non-optimal’ tomorrow; this is not possible in a
changing environment.
Despite some examples of well-adapted organisms cited in the literature,
biological organisms are not optimal, or perfectly adapted to their environments, because
many have features that evolved historically but no longer serve a purpose, while others
lack traits or combinations of traits that would be beneficial. Additionally, the
environment is constantly changing, making it impossible for biological organisms to be
perfectly suited for their environment at all times.
5.2 BIOLOGY IS OPTIMIZED BY EVOLUTION VIA NATURAL SELECTION.
Alternatively, references to ‘biology is optimized’ can also mean ‘biology is
subject to an optimization process.’ This appears to be the meaning in the following
quotations: “Nature solves complex real-world problems by maximizing fitness via
natural selection. We see the end product of this optimization in biological structure and
function” [120]; biological “approaches have been tested and improved upon for millions
of years; they are continuously being optimized with respect to their function and
environment” [112]; and “flyers in nature have been subjected to strong selection for
optimum morphology” [124].
Authors in the BID community generally agree that the only optimization process
in biology is evolution or, more specifically, evolution via natural selection. 37 out of 128
sources directly reference ‘evolution,’ and 9 reference ‘natural selection’ in their account
of BID; no sources consulted suggest that biology is optimized by another process. While
‘evolution’ does not imply optimization – “evolution simply means heritable change in a
50
line of descent” [131] – natural selection is associated with optimization and adaptation
[133].
5.2.1 Metaphors for ‘Evolution’ in BID Literature
BID authors commonly use three metaphors for evolution via natural selection:
‘research and development’ (R&D) – 3 sources; ‘experimentation’ – 6 sources; and ‘trial
and error’ – 5 sources. They liken these three concepts to evolution through statements
such as: “After 3.8 billion years of research and development, failures are fossils, and
what surrounds us is the secret to survival.” [21]; “After billions of years of trial and error
experiments, which turn failures to fossils, nature has created an enormous pool of
effective solutions” [69]; and “Through the course of 3.8 billion years, nature has gone
through a process of trial and error to refine the living organisms, process, and materials
on planet Earth” [9].
Upon inspection, it does not appear that R&D and experimentation are apt
metaphors for evolution. Ball [68] appropriately remarks:
It would be foolish to assume that natural selection stands proxy for the testing
laboratory or the market, refining a design in just those ways that a new product
demands. The complex of compromises that shape the fitness landscape of
evolution is likely to bear only incidental correspondences with that which
determines the contours of technological and economic viability.
When examined more closely, it is evident that there are substantial and fundamental
differences between the conscious, intentional, goal-oriented processes of R&D and
experimentation and the mechanistic, agent-less, goal-less process of evolution.
These inaccurate metaphors for the evolutionary process prove problematic and
cause authors to draw false conclusions. For instance, four sources claim that biological
analogies are useful because ‘biology has been evolving much longer than humans have
been researching solutions to similar problems.’ Richter and Grunwald [136] claim:
51
“Nature has been developing adhesives for millions of years, mankind for just a few
thousand years. For this reason it is worth having a closer look at what nature does and
how we can develop bio-inspired adhesives for technical and medical applications.” Ball
[68] also states: “[S]everal thousand good engineering heads cannot compete with the
billions of years that evolution has had to experiment, select and refine.” If evolution
were comparable to R&D or experimentation in an engineering context, this argument
makes sense: certainly 3.8 billion years of R&D should have resulted in fabulous designs,
compared to the few hundred thousand years of R&D that could have been undertaken
since the dawn of humanity. Unfortunately, of course, the process by which organisms
evolve in nature and the process by which products are developed are in no way
equivalent and, in fact, are totally and fundamentally different, so the argument does not
hold. Evolution via natural selection does not optimize biological organisms the same
way (or at the same speed) engineers optimize products through R&D or
experimentation.
To distance themselves from the notion that evolution is an intentional process,
five authors instead use the metaphor of ‘trial and error’ for evolution. Yen et al. [137]
pointedly choose this metaphor “to make plain that differences between intentional
design to produce a desired function and the unintentional, trial-and-error process of
evolution.” The notion that evolution is trial and error could be appropriate if one sees
‘errors’ as mutations or traits that prove disadvantageous to a particular organism in a
specific time period and environment.
In all cases, however, these metaphors for evolution lack the scientific detail
necessary to clearly define the ways in which the evolutionary process does and does not
optimize biology. Hence, a detailed discussion of evolution via natural selection is
necessary.
52
5.2.2 Evolution via natural selection optimizes populations.
Evolution via natural selection ‘optimizes’ or ‘adapts’ populations to their
environments. Through natural selection, the fittest individuals in a population, those best
suited for their environment, are most likely to survive and reproduce, causing traits that
confer higher fitness to become more common.
Natural selection adapts populations to particular ecological niches. “The general
idea of ‘niche’ refers to the ecological conditions that a species requires to maintain
populations in a given region, together with the impacts that the species has on its
resources, other interacting species, habitat, and environment” [138]. Ecological niches
are characterized by the dynamic effects between resources and consumers – by both the
“environmental factors” that “allow a species to exist in a given geographic region or in a
given biotic community” and the “effects… the species” has “on those environmental
factors” [138]. Different ecological niches place different demands on the same species,
meaning that the fittest set of traits for a particular species likely differ between
populations in different niches that face different environmental challenges. Six sources
reference ‘niches’ in their accounts of BID.
Additionally, populations become ‘optimized for’ or ‘adapted to’ their ecological
niches via natural selection operating on the relative fitness of different organisms within
the population. This means that the fitness of an organism as a whole – with the effects of
all traits and combinations of traits – is optimized, not the engineering-related
performance characteristics of traits of interest to engineers.
A wide range of authors agree that the fitness of an organism as a whole is
selected for, not the beneficial features of a particular trait. Gunderson and Schiavone
[139] state that it is the way an organism as a whole operates – not any one particular
system within the organism – that makes it successful. Ball [68] suggests it may not be
53
possible or practical to try to isolate a desirable biological feature from the organism that
possesses it. Campbell and Reece [133] discuss adaptations as compromises between
conflicting needs and show that biological organisms face multiple conflicting objectives;
for instance, humans’ prehensile hands and flexible limbs allow us to be more agile and
athletic, but also open us to the threat of ligament injury.
These compromises between conflicting needs can be observed through the many
types of natural selection that operate in biology – including gene selection, kin selection,
frequency-dependent selection, and sexual selection – which proceed via different
mechanisms and affect populations in different ways. In some cases, features favored by
one selection process prove disadvantageous in another process. For instance, the bright
plumage found in male peacocks is selected for through intersexual selection, but it is
costly [140] because it may increase the risk of being eaten by predators and consumes a
significant amount of energy to produce and carry [141]. Additionally, Schluter et al.
[142] discuss opposing selection, where fitness is both enhanced and reduced by the same
trait at different life history stages. One example of opposing selection occurs in the
medium ground finch where “survival selection favors small size in young birds but large
size in adults” [143].
Since evolution via natural selection is a multi-objective optimization process,
where many conflicting needs of an organism are optimized together, an ‘optimized’
kingfisher, for instance, would not have an optimized beak shape, but would instead have
all its features – its organ function, reproduction, behavior, and its beak shape, among
millions of other traits – optimized collectively. Some of these traits have little relevance
to engineering parameters. For instance, features that arise via intersexual selection to
make an individual more appealing to members of the opposite sex are unlikely to be
relevant to engineering.
54
Engineers frequently fail to recognize that optimization in biology has multiple
objectives, and they are unlikely to think about the factors being optimized besides the
engineering parameter of interest to them. For instance, Helms et al. [144] observed that a
common error undergraduates make when conducting BID is to oversimplify
optimization problems: “For example, designers viewed the structure of moss as a surface
area optimization problem for gathering sunlight, while ignoring protection and water
preservation requirements of the plant.”
Hence, evolution via natural selection optimizes populations in the sense that it
causes populations to become better adapted to their unique environmental conditions.
This process optimizes the fitness of organisms as a whole, including many different
objectives related to survival and reproduction, which are reflected in the many types of
selection pressures populations experience. Consequently, individual traits are unlikely to
be optimized for engineering parameters.
5.2.3 Factors that Impede Optimization via Natural Selection
However, evolution involves a number of factors that steer populations away from
‘optimized’ fitness by natural selection. Lynch [145] draws attention to the existence of
these non-adaptive forces in biology:
The vast majority of biologists engaged in evolutionary studies interpret virtually
every aspect of biodiversity in adaptive terms. This narrow view of evolution has
become untenable in light of recent observations from genomic sequencing and
population-genetic theory.
Many of the same factors make it challenging to positively identify optimization of a
population via natural selection when and if it is occurring because they cause non-
beneficial alleles to rise in prevalence. Hence, one cannot claim that a trait is becoming
‘optimized’ in a population simply because the alleles are becoming increasingly
55
prevalent. Below, genetic drift, gene flow, and mutations – particularly the mechanisms
of biased mutation, gene conversion, genetic hitchhiking, and large mutations – will be
discussed in this context of countering optimization by natural selection and/or making it
more difficult to identify true adaptations when they occur.
Genetic drift both counters natural selection and makes it more difficult to
identify true adaptive evolution. Genetic drift is a process whereby the frequencies of
genetic variants fluctuate randomly over generations, “sometimes causing an initially rare
variant to become established (fixed) in a species” [146]. Genetic drift can ultimately
counter optimization via natural selection: “[B]y magnifying the role of chance, genetic
drift indirectly imposes directionality on evolution by encouraging the fixation of mildly
deleterious mutations and discouraging the promotion of beneficial mutations” [145]. It
can also “overwhelm selection” under conditions where the effective population size is
low and selection is sufficiently weak [147]. Because of genetic drift, the observation that
a particular trait has become prevalent in a population does not necessarily mean that the
population is becoming optimized for this trait; it may just be a result of random factors.
This is especially true in small populations, where genetic drift has the largest effect.
Gene flow describes the flow of genes between otherwise separated populations
through mating. Consequently, gene flow “helps keep separated populations genetically
similar” [131], meaning it counteracts any sort of ‘optimization’ arising via natural
selection to make either population better suited for its unique environmental conditions.
While mutations introduce the genetic diversity that enables natural selection to
optimize traits, they also typically lead populations away from the ‘optimum’ introduced
via natural selection. Mutations typically have a negative effect on organisms; “a single
mutational change is about as likely to improve the genome as blindly firing a gunshot
through the hood of a car is likely to improve engine performance” [133]. If a population
56
were, at some point, composed of only individuals possessing the global optimum of a
particular trait, mutations in the offspring of this optimized population would appear, de-
optimizing the population.
“[G]enome composition is governed by biases in mutation and gene conversion”
[145], meaning biases in mutation and gene conversion can have a significant effect on
the traits arising within a population. Biased mutations can change the direction of
evolution, not because that direction of change is better than any other, but because there
are more likely to be mutations – and hence, more likely to be favorable mutations – in
that direction. Stoltzfus and Yampolsky [148] explain how mutation bias is a source of
nonrandomness in evolution, imposing “predictable biases on evolution.” Biased gene
conversion can have a similar effect; “[b]iased gene conversion is a process by which a
heterozygote is converted into a homozygote during recombination; this is often biased in
favour of one of the two alleles, resulting in one allele being driven through the
population” [149]. In both biased mutation and gene conversion, alleles are become more
prevalent in a population as a result of chemical or molecular properties of the genome
itself.
Genetic hitchhiking can cause unfavorable traits to become fixed in a population
because these traits are associated with other, more favorable, mutations. Genetic
hitchhiking occurs when a “favourable mutation arises, and increases to fixation,” giving
“a fortuitous advantage to all the genes with which it was originally associated” [150]. In
some cases, the associated genes can also become fixated in the population. Larger
populations are more likely to experience beneficial mutations and are consequently also
more likely to experience the effects of genetic hitchhiking [151]. “[T]he level of
recombination… influences the sensitivity of a locus to spurious hitch-hiking effects”
[145].
57
In addition, large and otherwise beneficial mutations leading to ‘optimization’ of
a population from an engineering perspective frequently cannot remain in the population
due to biological constraints. Organisms with mutations that result in a drastic change in
the organism often prove lethal or prevent the organism from reproducing [131]. BID
authors, Knippers et al. [152] make reference to this point when they note that the
structures organisms have inherited “and the fact that living beings have to ‘function’
successfully during all phases of evolution confine the potential of natural selection as an
optimizing agent.” Additionally, Vincent [86] states that biological organisms are
unlikely to be able to find global optima via the evolutionary process, except in cases
where environmental factors force temporary de-optimization of organisms away from a
local optimum. This is because mutations that cause major phenotypic differences from
the local optimum are unlikely to survive and reproduce, and small mutations that cause
slight phenotypic differences from the local optima are likely to prove inferior to the local
optima, making them less likely to remain in the population.
Accordingly, evolution via natural selection is an optimization process in the
sense that when selection pressures dominate the other factors that affect evolution – the
rate of gene flow and mutation – a population should be becoming increasingly better
suited to its environment with each successive generation. However, if there is not strong
selection pressure for a particular trait, or if the rates of the other factors are high, this
will not be the case. Likewise, biological realities dictate that large mutations, which
might otherwise be beneficial from an engineering perspective, are rarely viable,
impeding biology’s optimization from an engineering perspective.
58
5.2.4 Macroevolution: Speciation and Extinction in the Context of Optimization
To this point in the chapter, evolution via natural selection has been discussed
only in the context of “adaptive modifications within populations over time,” or
microevolution [153]. Microevolution is presumably what most BID authors have in
mind when discussing optimization in biology when they mention features that evolved
in biology with enviable performance characteristics or ‘evolution over millions of
years.’ 15 sources mention ‘evolution over millions of years’ in their accounts of BID.
However, a subset of BID authors appear to refer to macroevolution, which
involves “speciation and the origin of the divisions of the taxonomic hierarchy above the
species level” [153] and occurs on geologic time scales. Presumably, the 25 BID
accounts discussing the “3.8 billion years of evolution” [21] and “evolution by natural
selection over the past few billion years” [116] refer to macroevolution. Authors also
likely discuss macroevolution when they make statements such as “failures are fossils”
[21] and “the experiment in the evolution of mega-scale terrestrial biology failed… [it]
ended with the extinction the prehistoric mega-creatures (e.g. dinosaurs and mammoths)”
[69]. Eight sources contain quotations to this effect that state or imply that extinct
species are “failures” [21,69], “unsustainable” [28,154], unsuccessful [24,155], poorly
adapted [156], and not adaptable to other environments [154].
The types of characteristics that would evolve via natural selection acting over
billions of years are likely related to the ability of organisms to survive environmental
change and adapt quickly to new environments. 8 BID sources reference ‘adaptability in
biology,’ possibly referring to the evolution of an enhanced ability to adapt to different
environments. An organism’s ability to adapt involves how robust it is to different
environments, how phenotypically plastic it is, and the rates of mutation experienced by
59
the organism. Each of these characteristics and the likelihood that it could arise via
natural selection will be discussed in detail below.
First, it is possible that natural selection over 3.8 billion years would select for
hearty organisms, capable of living as-is in a wide range of environments. Indeed, work
from Payne and Finnegan [157] shows that “geographic range is likely the most
consistently significant predictor of extinction risk in the marine fossil record” for the
Phanerozoic era, with a wide geographic range “significantly and positively associated
with survivorship.” If organisms live over a broad geographic range they are likely to
have the ability to survive in many different environmental conditions, meaning that
many types of small environmental changes are unlikely to devastate their populations, as
they are already environmentally flexible. Additionally, a wide geographic range makes it
more likely that localized environmental changes that might prompt the death of all
affected members of the species are less likely to cause the extinction of the species,
because it reduces the chance that all members of a species will be affected.
Second, evolution over billions of years could have selected for phenotypically
plastic organisms, those that have genotypes that are able to change phenotype as a result
of environmental conditions. In some sense, selection for phenotypic plasticity could be
considered the optimization of “the way in which an individual responds to
environmental influences” [158]. Agrawal [159] maintains that “[t]he evolution of
adaptive phenotypic plasticity has led to the success of organisms in novel habitats,
and… phenotypic responses in species interactions represent modifications that can lead
to… expanded evolutionary potential of species.” However, there is disagreement in the
field regarding the overall effect of phenotypic plasticity and “its role in adaptive
evolution” [158].
60
Third, evolution via natural selection over billions of years may select for blood
lines capable of mutating rapidly to meet changing environmental conditions. For
instance, “Galápagos finches can evolve a 10% change in average body size or bill size in
a population in a single year in response to either droughts or heavy rainfall” [132]. The
evolvability of a biological organism is related to how easily “natural selection directly
advanc[es] features of genomic architecture, genetic networks, and developmental
pathways to promote the future ability of a species to adaptively evolve” [145]. One
component of evolvability could be selection for mutation rate, with populations with
high rates of viable mutations more likely to survive environmental change. Hodgkinson
and Eyre-Walker [149] explain the factors that contribute to whether there will be
selection for the mutation rate – effective population size, current mutation rate, the
degree to which the mutation rate changes, “the number of affected sites and the average
effect of a mutation.” They show that there does not appear to be selection on the
mutation rate in humans and that “[T]he evidence that some genomic regions have been
selected for high or low mutation rates is weak” [149]. Additionally, the existence of
evolvability is controversial, and some authors, including Lynch [145], argue that it is a
myth.
Regardless of the doubts regarding the existence of optimization via
macroevolution, even if this type of optimization does exist, it is unlikely to be applicable
directly to engineering design. Engineers might be able to learn from biology how to
develop mechanisms that can operate in many different types of terrain or different
temperature ranges, as the ‘robust’ or ‘hearty’ organisms do. However, while it would be
wonderful if engineers could also learn how to make functionally plastic designs or more
evolvable designs from biology, the reality is that biology’s mechanism for doing this –
genetic mechanisms operating over many generations – is not relevant to mechanical
61
engineering design. As the human-engineered designs of interest here are not made of
DNA and do not reproduce, the mechanisms of genetics to generate adaptable designs are
not relevant.
‘Fossils are failures’ may hold true in the sense that extinct organisms may not
have been sufficiently robust, sufficiently phenotypically plastic, or had sufficiently-high
mutation rates for any of their descendents to survive in a changed environment.
However, upon inspection it does not seem appropriate to think of all, or any, extinct
species as ‘errors’ or ‘failures’ from an engineering perspective. First, many reasons
unrelated to biological fitness may cause a species to go extinct. For instance, Bar-Cohen
[69] notes:
[T]he extinction of a species is not necessarily the result of a failed solution; it can
be the result of outside influences, such as significant changes in climate, the
impact of asteroids, volcanic activity, and other conditions that seriously affect
the ability of specific creatures to survive.
Reznick and Ricklefs [153] provide similar reasons as the cause of mass extinctions:
“Mass extinctions have external causes, including bolide (large crater-forming projectile)
impacts, major tectonic events, and climate change.” One can hardly call a species that
goes extinct as a result of an unlucky proximity to an asteroid impact or volcanic activity
an ‘error’ on the part of biology. From an engineering perspective, it seems that any
physical system that was once viable in biology has potential to be of interest to
engineers. There is no reason to think that the beak profile of the kingfisher has anything
more to give engineering than the beak profile of a pterosaur, for instance, simply by
virtue of the fact that kingfishers are alive today. Hence, it does not appear that
optimization through macroevolution via natural selection has direct applications in
engineering design the way the microevolution via natural selection does.
62
On the scale of billions of years, macroevolution via natural selection may occur,
optimizing populations to produce hearty organisms capable of surviving in many
different environments, phenotypically plastic organisms, or organisms that are highly
evolvable and have high rates of positive mutations. However, these types of
optimization frequently prove controversial in biological literature. Additionally, it is
unclear how optimization for these favorable genetic processes could be applied to
engineering design.
5.3 BIOLOGY IS OPTIMIZED FOR EFFICIENCY.
21 sources refer to the archetypal claim ‘Biology is optimized for efficiency’,
through statements such as: “Biomimicry refers to the process of using nature’s efficient
design solutions to inspire engineering innovations” [62]; “The evolution of nature led to
the introduction of highly effective and power efficient biological mechanisms” [69];
“Biological materials are produced by self-assembly… in a way that costs minimal
energy” [155]; and “during ~ 3.4 billion years of fierce evolutionary competition nature
has refined energy conversion efficiency” [24].
Because biological organisms have many characteristics that are optimized
together, as discussed above, it is unlikely any specific energy- or materials-related
characteristic is optimized for efficiency from an engineering standpoint. Hambourger
[70] makes a similar point: “[T]hroughout evolutionary history, nature has always
selected the most reproductively fit individuals, not necessarily those with the attributes
most readily adapted to fulfilling human energy needs.”
Efficiency is, however, one of many factors potentially being selected for in
natural selection: “As fitness-related traits are often energetically costly, selection should
also act directly on the energetics of individuals” [160]. A number of authors claim that
63
selection pressure related to energy consumption is present, along with other important
factors, for specific biological systems. For instance, Sengupta et al. [161] “argue that
natural selection for energy-efficiency could help explain both the shape of the action
potential and the underlying biophysics of ionic currents” in mammalian brains. Fong et
al. [128] discuss eye and pigment reduction in cave animals as being the result of “energy
economy in resource-poor environments” and the “flightlessness in some island-dwelling
birds” as occurring as a result of a drive toward metabolic efficiency. Niven and Laughlin
[162] discuss the tradeoffs between the fitness benefits associated with sensory
information and the energetic costs associated with sensory-related muscle- and neural-
energy consumption. Ruxton and Wilkinson [163] maintain that sauropod dinosaurs
would have benefitted energetically from the elongation of their necks, allowing them to
access higher and lower foliage without needing to move their large bodies, but that these
energetic benefits would have been countered by other factors, such as “mechanical
aspects of the support and control of a long structure – or breathing considerations” that
would have countered the energetic benefits at some optimum neck length.
However, efficiency is not always an important factor in selection, and sometimes
organisms actually have a higher fitness because they are inefficient. For example, Barber
[164] maintains that on a global scale, there is low selection pressure promoting energy
efficiency in photosynthesis because the raw materials needed for photosynthesis,
including sunlight, “are available in almost unlimited amounts,” and as a result,
photosynthetic efficiencies are low, rarely exceeding 1 or 2%. Additionally, Boratynski et
al. [160] found that for female bank voles, internal energy efficiency – or a low metabolic
rate – actually reduces fitness levels and increases the likelihood that the voles will die
during the long Finnish winter.
64
Consequently, when analyzed on a case-by-case basis, it quickly becomes
apparent that no generalization can easily be made regarding the selection pressure that
energy consumption applies to organisms. Many organisms are optimized by natural
selection to be efficient, while others are selected to be inefficient.
5.4 CONCLUSION
Although many examples of well-adapted biological organisms exist, organisms
are not perfectly adapted or ‘optimal’ for their environments. Organisms frequently have
features that serve no purpose, and they lack features and combinations of features that
would be highly beneficial to them. Also, since the environment is constantly changing, it
is not possible for organisms to be perfectly adapted to their environments at all times.
All biological organisms are subject to evolution via natural selection, an
optimization process that helps organisms become better suited to their environment. In
some cases, this can be of engineering significance, when the traits being selected for are
aimed at reducing energy consumption or performing a function engineers find
interesting. However, evolution via natural selection maximizes the fitness of the
organism as a whole; it does not optimize solely the specific performance characteristics
of interest to engineers. Additionally, optimization via natural selection is countered by
other evolutionary processes, such as mutation and genetic drift, that introduce diversity
into populations. These processes also make it difficult to identify instances where the
increasing prevalence of a trait in a population occurs as a result of natural selection.
Finally, on a geologic time scale, macroevolution via natural selection occurs, possibly
selecting for highly evolvable and adaptable blood lines capable of rapidly adapting to
and surviving in changing environmental conditions. However, selection for these
65
characteristics is controversial, and these types of traits are much less likely to have
applications in the design of improved engineering systems.
Additionally, there is evidence that there is selection pressure, and hence
optimization, for efficiency in a number of organisms and conditions, although this is not
always the case.
66
Chapter 6: Sustainability-Related Benefits
53 out of 128 sources reference ‘sustainability in biology’ through statements
such as: “Taking a biologically inspired approach, one abstracts ideas from nature, a
sustainable system” [43]; “Emulation of the inherently sustainable living world through
biomimetic design potentially offers one approach to creating sustainable or, at least, less
unsustainable products” [28]; “Biological organisms, phenomena, and strategies…
provide insight into sustainable and adaptable design” [119]. Some authors acknowledge
that their beliefs that biology is sustainable are not proven. For instance, Vincent [71]
states: “I make a single assumption: the biological system that we inherited on this planet
is the paradigm for sustainability.”
Quotations from accounts that referenced ‘sustainability in biology’ were grouped
into three archetypal claims: (1) Biology has withstood the test of time – 9 sources; (2)
Biology is environmentally sustainable (in general) – 9 sources; and (3) Biology has
specific environmental advantages – 51 sources. The third archetypal claim is broken into
7 subsections, for each life cycle stage referenced: (3a) Biological organisms use
renewable and abundant inputs – 9 sources; (3b) Biological materials are nontoxic – 2
sources; (3c) Biological organisms employ sustainable manufacturing processes – 15
sources; (3d) Biological organisms do not pollute – 5 sources; (3e) Materials in biology
are recycled – 9 sources; (3f) Biological organisms are resistant to damage – 9 sources;
and (3g) Biology is efficient – 42 sources. These claims and sub-claims are all depicted in
the figure below.
67
Figure 13: All archetypal claims and sub-claims related to sustainability. The lower-level
claims related to ‘Biology has a small environmental impact’ are not
included in the diagram shown in the methodology section.
6.1 BIOLOGY HAS WITHSTOOD THE TEST OF TIME.
A number of authors define sustainability in the biological world as being related
to life’s ability to endure [28] and persist [43] over billions of years. Nine sources state
that biology is sustainable in this sense, and either reference the ‘lasting’ solutions in
biology or the fact that biology has ‘withstood the test of time.’
The archetypal claim ‘Biology has withstood the test of time’ holds true when
examined more closely; life has indeed persisted for billions of years. Biological
organisms’ ability to collectively survive and remain on earth for such an extended period
of time indicates that biology has the ability to sustain itself. Given the great diversity of
life forms on the planet adapted to a wide range of environments, life is likely to continue
to do so.
However, many biological characteristics have changed significantly since the
first organisms. Over the last 3.8 billion years, the environment has changed dramatically,
68
and the types of biological systems that inhabit the earth have likewise changed. Life as a
whole has endured over this time period, but individual species for the most part have
not. While it appears that there have been long periods of stasis in biology [145] where
species remain relatively unchanged for millions of years [165], few of the organisms that
currently exist – or the characteristics of these organisms – have truly withstood the test
of the last billion years and have remained unchanged over this time period. The
macroscopic traits of plants and animals frequently used as analogies in BID are far from
the traits possessed by single-celled organisms billions of years ago.
Hence, if using biological analogies that have ‘withstood the test of time’ is truly
critical for sustainable design (or BID in general), then perhaps only those characteristics
shared by the first organisms that have truly persisted over these 3.8 billion years should
be the focus of biological analogies. For instance, the molecular components of
organisms – the genetic code and some metabolic pathways – are shared by a diverse
range of organisms [166]. However, even the DNA recombination processes have
changed, for instance, through sexual reproduction and the possible evolution of
evolvability, discussed in Chapter 5.
Additionally, it is incorrect to connect ‘withstanding the test of time’ to ‘having a
small environmental impact.’ Doing so would be committing the logical fallacy of
equivocation. Equivocation is a “verbal sleight of hand” where the argument shifts
“between two senses of a word or expression” [167] and “the force of an argument
depends on such shifts of meaning” [168]. The use of fallacious arguments using
different definitions of the word ‘sustainability’ can lead authors to mistakenly conclude
that BIDs are better for the environment than alternatives. For example, a very simple
fallacious argument along these lines could be constructed as follows:
69
1. Biological systems are sustainable; life has survived over 3.8 billion years and
has withstood the test of time.
2. Systems that are sustainable have a low environmental impact.
ergo, 3. Biological systems have a low environmental impact.
Because environmental sustainability in this context means having a small environmental
impact, and this is not directly related to ‘withstanding the test of time,’ there is no reason
to surmise that biology has a low environmental impact from the fact that it has withstood
the test of time.
In conclusion, some biological organisms and features have ‘withstood the test of
time’ and have remained essentially unchanged for billions of years. However, this is
likely to represent only a small fraction of all potential analogies that could be used from
biology. Additionally, thinking of sustainability in terms of ‘withstanding the test of time’
in this way is wholly unrelated to environmental impact; there is no reason to think that
imitating a biological system that has remained unchanged for billions of years is any
more likely to produce a concept with a smaller environmental impact than a biological
feature that just evolved.
6.2 BIOLOGICAL ORGANISMS ARE ENVIRONMENTALLY SUSTAINABLE.
Nine sources refer to the archetypal claim ‘biology is environmentally
sustainable,’ which is taken to mean: ‘biological organisms have a positive environmental
impact,’ ‘biological organisms are unlikely to have a negative environmental impact,’ or
‘biological organisms have no environmental impact’. The analysis of this archetypal
claim is divided into two sections, the first looking at human-related environmental
impacts and the second dealing with non-human related environmental impacts.
70
6.2.1 Human-Related Environmental Impact
The introduction, preservation, or flourishing of biological organisms is
frequently seen as having a positive environmental impact. For instance, the preservation
of endangered species, such as the manatee, is typically regarded as ‘good for the
environment.’ Tree planting and forest preservation is seen as part of many carbon
control strategies in the face of climate change [169] and can even earn carbon credits
under the Kyoto Protocol [170]. These examples may lead one to believe that the
flourishing of biological systems, in general, is good for the environment.
However, organisms used as natural resources by humans are commonly seen as
having a negative environmental impact. Many biological systems that serve as resources
for humans have had their life cycle environmental impacts studied, including intensive,
extensified and organic grassland farming [171]; fish farms for rainbow trout, sea-bass,
and turbot [172]; and production systems for dairy [173]; red meat [174]; corn grain and
corn stover [175]; ethanol from corn, switchgrass, and wood; and biodiesel from
soybeans, sunflowers [176], and microalgae [177]. These analyses make it clear that
biological organisms used as natural resources can have a negative environmental impact.
As was discussed in the section on environmental ethics in Chapter 2, biological
systems include ‘non-desirable’ organisms that are threatening to humans and,
consequently, their destruction can be seen as ‘good for the environment.’ For instance,
the proliferation of parasites, bacteria, and viruses harmful to humans is typically viewed
negatively and could certainly be considered ‘bad for the human environment.’ Jolliet et
al. [51] likewise observe: “Growth of populations is generally seen as a benefit in the
case of species with a historical trend towards extinction, whilst growth of invasive,
ubiquitous species can be seen as a damage.”
71
Invasive species are another type of ‘non-desirable’ organism that is frequently
considered to have a negative environmental impact. Although invasive species are not
necessarily harmful [178,179], they frequently are regarded as having “negative impacts
on the environment, human activities or human health” [179], “[n]egative interactions”
with native species [180], as causing “economic or environmental damage” [3], and as
being “aggressive” [178], particularly when the invasion is caused by human activity. For
instance, Pimentel et al. [181] estimate that “[i]nvading alien species in the United States
cause major environmental damages and losses adding up to almost $120 billion per
year.” Additionally, because invasive species frequently have traits that make them better
suited to an environment than native species, they can prevent native species from
accessing resources, changing the established ecosystem dynamics with potentially
disastrous consequences. Consequently, invasive species “pose major threats to
biodiversity, ecosystem integrity, agriculture, fisheries, and public health” [179] and have
caused “a massive biotic homogenization of the Earth’s surface” with “consequent
devastation of the endemic biota of specific regions” [178]. In fact, estimates indicate
that “42% of the species on the Threatened or Endangered species lists are at risk
primarily because of alien-invasive species” [181].
Hence, the removal or destruction of invasive species is seen as being ‘good’ for
the environment, the presence of invasive species is considered ‘bad’, and both are
accounted for in LCAs. The United Nations Convention on Biological Diversity states
that contracting parties should “[p]revent the introduction of, control or eradicate those
alien species which threaten ecosystems, habitats or species” [54] to prevent further
environmental damage. For example, the Australian government may award carbon
credits to those who kill feral camels, because camels are responsible for significant
damage to native animal and plant species and are responsible for carbon emissions
72
[182,183]. Additionally, Jolliet et al. [51] discuss how invasive species can be considered
a damage indicator in LCA if the invasion is caused by humans.
Consequently, it is clear that the proliferation of biological organisms in the
context of human activity is not inherently or necessarily good for the environment. The
preservation of ecological diversity is typically viewed as inherently good, as is the
proliferation and protection of carbon-capturing species in the face of climate change.
However, there are a number of organisms typically considered inherently bad – such as
organisms that cause disease in humans – and their destruction is viewed as having a
positive environmental impact. Many other organisms are considered bad in particular
contexts; invasive species, for instance, can wreak environmental havoc on the
ecosystems they invade.
6.2.2 Environmental Impact of Biology Unrelated to Humans
While it is uncommon to conduct an LCA on organisms in the wild, some wild
organisms, particularly those referred to as ‘ecosystem engineers’ are frequently regarded
by biologists as having significant environmental impacts. Ecosystem engineers
physically change the environment “through their behavior or by virtue of their large
collective biomass” [133]. They affect “the availability of resources to other species”
[184] and “modify, maintain and create habitats” [8]. For instance, corals and trees
change the environment through the presence of their physical structures, whereas
woodpeckers and beavers affect the environment though the changes they make to
materials [8].
Jones et al. [8] define the scale of the environmental impact of ecosystem
engineers in terms of six factors:
(i) Life time per capita activity of individual organisms.
(ii) Population density.
(iii) The spatial distribution, both locally and regionally, of the population.
73
(iv) The length of time the population has been present at a site.
(v) The durability of constructs, artifacts and impacts in the absence of the
original engineer.
(vi) The number and types of resource flows that are modulated by the constructs
and artifacts, and the number of other species dependent upon these flows. [8]
The environmental impact of ecosystem engineers can be both positive and negative,
where positive impacts enhance “species richness and abundance” and negative impacts
reduce these traits [185]. “For example, by modifying soils, the black rush Juncus gerardi
increases species richness in some zones of New England salt marshes” [133], meaning
its impact would be considered to be positive.
Beavers, for instance, create habitats for some species while initiating
environmental changes that destroy habitats of others [185]. However, Jones et al. argue
that on a larger scale, the addition of a beaver-engineered habitat results “in a net increase
in the number of habitat types, space, and resources for other species,” allowing a greater
diversity of species to be supported in the same area [185] and that a similar
environmental benefit will be seen in most other cases of ecosystem engineering.
Some organisms besides humans have had a significant and lasting impact on the
global environment [8,131]. For instance, “early photosynthetic prokaryotes… introduced
oxygen into Earth’s atmosphere”, allowing for the formation of the ozone layer and
totally changing the global environment [99]. Additionally, “the production of the
‘greenhouse’ gas methane” by sauropod megaherbivores during digestion “could have
been significant in sustaining warm climates” during the Mesozoic Era [186].
Hence, biological organisms in the wild can also have significant environmental
impacts. These impacts can be both positive and negative, where positive impacts
enhance, and negative impacts reduce, the richness and abundance of species.
74
6.3 BIOLOGY HAS SPECIFIC ENVIRONMENTAL ADVANTAGES.
51 sources claim that biology has a specific environmental advantage. This
archetypal claim is broken down into 7 subsections, one for each type of environmental
advantage referenced. These claims are: (a) Biological organisms use renewable and
abundant inputs; (b) Biological materials are nontoxic; (c) Biological organisms employ
sustainable manufacturing processes; (d) Biological organisms do not pollute; (e)
Materials in biology are recycled; (f) Biological organisms are resistant to damage; and
(g) Biology is efficient. Each of these claims will be discusses separately below.
6.3.1 Biological organisms use renewable and abundant inputs.
Nine sources reference the claim ‘biological organisms use renewable and
abundant inputs’. A number of sources mention that biology runs on sunlight
[21,70,135,187,188], does not consume nonrenewable resources, such as fossil fuels
[21,135,187], and only uses materials abundant in its environment [68]. Many sources
marvel at the photosynthetic process and its ability to harness solar energy [21,189,190].
When researched further, it indeed appears that biological organisms are generally
fueled by renewable and abundant inputs. In the commonly-accepted concept of a food
chain, sunlight is the only initial energy input typically considered; in Golley’s [191]
analysis of the energy dynamics of a food chain in old-field community, for instance, the
only energy input included is solar insolation during the growing season. From a global
perspective, the raw materials needed for photosynthesis – “sunlight, water and carbon
dioxide” – “are available in almost unlimited amounts” [164], although this is of course
not the case in all local environments, such as in deserts. Additionally, prosperous
organisms are likely to rely on food found in abundance that is grown or produced
through other biological processes, such as photosynthesis, and is, hence, renewable as
well.
75
However, one could argue that there are exceptions to this rule, although these
exceptions appear to be relatively rare. Some biological organisms use fossil fuels as
energy inputs; for instance, hundreds of species of bacteria, cyanobacteria, and fungi are
capable of using hydrocarbons as a source of carbon and energy [192]. Additionally, a
number of species require the presence of other species in their environments, and these
other species may not be abundant. For instance, a study examining seed bank dynamics
of Oenothera deltoids ssp. Howellii, a highly endangered plant, found that the lack of
hawkmoths or other effective pollinators in the environment hampered its reproductive
success [193].
Hence, it appears that, in general, biology runs on renewable and abundant inputs,
although there are a few rare exceptions to this rule.
6.3.2 Biological materials are nontoxic.
Two sources mention ‘non-toxicity in biology’ in their accounts of the benefits of
BID, claiming that “organic materials…are self-assembled… with no toxic aftertaste”
[21] and, more specifically, that “natural materials for biological optical systems… are
nontoxic” [194].
When examined using biological literature, it becomes apparent that this does not
generally hold true. While there are numerous examples of non-toxic biological
organisms and substances, there are also many examples of biological organisms that
produce chemicals toxic to other organisms. For instance, some algal blooms release
toxins poisonous to marine organisms and people [195]; “[m]any cyanobacteria are toxic
to zooplankton” [196]; the seeds of the tree Aesculus californica are toxic to vertebrates
[197]; plants used to make botanical insecticides contain compounds toxic to insects
[198]; Sistrurus rattlesnakes have venom toxic to their prey [199]; the wasp Eulophus
76
pennicornis has venom toxic to tomato moth larvae [200]; and bombardier beetles squirt
noxious chemical on their predators as a defense mechanism [123].
Hence, it does not appear that biological materials are generally nontoxic.
6.3.3 Biological organisms employ sustainable manufacturing processes.
Fifteen sources refer to the claim that manufacturing processes in biology are
sustainable. Some refer to biology’s “Life-friendly manufacturing processes” [21], while
others marvel at the production of biological materials at room temperature and pressure
[68,69,73,127,154,201]. In addition, other authors focus on the low level energy inputs
necessary to make materials in biology, such as ceramics [202], biocomposites [126],
bone, collagen, and silk [69,154].
It is true that many manufacturing processes in biology occur at ambient
temperatures and pressures. For instance, spiders produce silk at “close to ambient
temperatures and pressures using water as the solvent,” unlike competing engineered
materials such as Kevlar [15]. Additionally, coral create material with properties similar
to cement at low temperatures and pressures; they extract calcium and magnesium from
seawater and use it to produce their shells and reefs [203]. In this sense, many of the
biological manufacturing processes could serve as examples for engineers to develop
manufacturing processes at ambient temperatures and pressures, potentially making these
processes more energy efficient.
However, when examined more closely, it becomes apparent that some biological
organisms produce materials at high temperatures and pressures. For instance,
bombardier beetles, mentioned above, heat a mixture of noxious chemicals and water to
100 °C which they spray on predators [123]. Additionally, hydrothermal synthesis – “the
synthesis by chemical reaction of substances in a sealed heated solution above ambient
77
temperature and pressure” – is believed to have played a significant role in the origin of
life [204]. Finally, many thermophiles and piezophiles live, grow, and reproduce – i.e.
they self assemble their bodies and produce offspring – in high temperature and high
pressure environments, respectively. Piezophilic bacteria, such as deep-sea Shewanella
violacea, [205] “possess optimal growth rates at pressures above atmospheric pressure”
[206]. Bacillus stearothermophilus is a thermophilic bacterium that is found in the deep
sea and has been shown in laboratory experiments to form colonies “between 39 and 70
C at atmospheric pressure and between 54 and 67 C at 45 MPa” [207].
Additionally, forming materials at low temperatures and pressures is not
necessarily a requirement for sustainable manufacturing processes, nor is it a guarantee of
sustainable manufacturing processes where present. The material synthesis occurring in
organisms living inside volcanoes or at the bottom of the sea is unlikely to have a larger
environmental impact than any other biological process; they just happen to make use of
the physical realities of their environments in their materials synthesis process. Similarly,
the fact that a manufacturing process in biology occurs at low temperatures and pressures
does not guarantee that it has a low environmental impact; organisms may still be highly
energy- or materials- inefficient in manufacturing, or they could produce toxins as a
result of the biological ‘manufacturing’ processes, for instance.
A complete analysis of whether manufacturing in biology is sustainable,
addressing the topics mentioned above, is outside the scope of this work. Such an
analysis would likely involve in-depth research on a broad range of topics: (1) A formal
definition of what ‘manufacturing in biology’ does, and does not, include; (2) An analysis
of the movement of energy and materials through different types of food chains to gain
an understanding of the macro-scale efficiency associated with ‘building’ different types
of organisms, similar to Golley’s [191] study of the energy dynamics of an old-field
78
community food chain; (3) A micro-scale analysis of the energy and materials
efficiencies of ‘self assembly’ in biology, e.g. a study of the metabolic cost of producing
a skeleton, including “the actual calorific value of the skeleton, the work that has to be
done to concentrate the raw materials in one place against a concentration gradient, and
the work that has to be done in organizing the material once it is there” [208]; (4) An
analysis of the outputs (wastes) associated with these processes; and (5) An analysis of
many different types of ‘manufacturing’ processes performed by biological organisms in
the context of tool use and animal artifacts – beaver dam construction, etc. – if deemed
applicable.
Hence, many manufacturing processes in biology could be considered
‘sustainable’ because they typically occur at low temperatures and pressures. However,
there are a number of notable exceptions to this rule in biology. Additionally, having a
low temperature and pressure does not guarantee that a biological process has a low
environmental impact and would be considered ‘sustainable’. Finally, exploring the
environmental impact of all biological manufacturing processes is an extraordinarily
broad and complicated endeavor that is out of the scope of this text.
6.3.4 Biological organisms do not pollute.
Five sources claim that biology is a model for sustainability because non-human
organisms do not pollute. Benyus marvels at biological organisms’ ability to perform
functions that are desirable in engineering without polluting [21,187]. More specifically,
Bar-Cohen discusses the biology’s ability to produce materials without emitting
pollutants [69,127], and Paturi notes that plants are able to perform functions without
generating air or noise pollution [209].
79
However, when a broader swath of literature is examined, it becomes clear that
some biological organisms emit pollutants.
One of the primary examples of pollutants produced by biological organisms is
methane, a greenhouse gas produced by both “the anaerobic decay of organic matter in
rice fields and natural wetlands” and “the anaerobic fermentation of organic matter in the
rumen and lower gut of domestic and wild animals” [210]. Methane emissions from
animals are recognized as having an environmental impact on par with those of human
pollutants. Clark [183], for instance, compares the annual carbon dioxide equivalent
emissions of camels, cows, and cars to a long-haul flight, as is show in the figure below.
Figure 14: Comparison of carbon-dioxide equivalent emissions from Clark [183],
including those from camels and cows.
Similarly, Wilkinson et al. [186] compare methane production in sauropod
megaherbivores in the Mesozoic Era to global methane emissions from cows, pre-
industrial emissions, and current global emissions. They ultimately find that “sauropod
megaherbivores could have been significant in sustaining warm climates” during the
Mesozoic Era [186].
80
Figure 15: Comparison of methane emissions from Wilkinson et al. [186], including
those from sauropods and cows.
Additionally, a 1986 estimate from Crutzen et al. [210] found that methane production by
animals was “one of the most important individual sources within the tropospheric CH4
cycle,” making up “15-25% of the total tropospheric CH4 input,” with only emissions
from rice fields and natural wetlands making up a potentially greater share.
Furthermore, feces from animals are commonly considered pollution. Parveen et
al. [211] state: “Estuarine waters receive fecal pollution from a variety of sources,
including humans and wildlife,” and Geldreich and Kenner [212] discuss species of
bacteria commonly found in animal feces that “may be considered a specific indicator of
non-human animal pollution.” Fecal pollution is most frequently discussed in the context
of its impact on human activities, such as the fact that it “can degrade water quality and
restrict its use for harvesting sea foods, as well as recreational activities” [211].
Numerous other materials emitted by biological organisms could be considered
pollutants, such as toxic releases from some algal blooms into the ocean [195] and the
emission of CO2 by biological organisms during respiration.
81
Hence, some biological organisms do emit pollutants, and these emissions can
have a large-scale effect on the atmosphere and environment globally.
6.3.5 Materials in biology are recycled.
Six sources mention the recycling of materials in nature, through statements such
as: “Nature recycles everything” [21] and “all nature’s engineering products are fully
recyclable” [213]. An additional three sources name examples of materials that are
recycled in biology. For instance, Bar-Cohen discusses the food chain in which plants are
eaten by herbivores, carnivores eat herbivores, and the bodies of carnivores decompose
fertilizing plants [189].
Materials in biology could be said to be recycled when they are eaten by other
organisms through predation or decomposition. When this occurs, the biological material
is broken down and reused in another organism over a short time frame, the same way the
material in a recycled aluminum can is broken down and used again. Along a similar
vein, birds using fallen twigs for building nests could be considered an example of
repurposing in biology, and the use of abandoned shells by hermit crabs [214] could be
considered an example of reuse.
However, there are numerous cases in which biological materials are not recycled,
repurposed, or reused by other organisms on non-geologic time scales, as the engineering
definitions of these terms imply.
For instance, the accumulation of the bodies of dead organisms over geologic
time periods appears to be more aptly likened to landfill disposal of waste than to
recycling. For instance, fossil fuels are made from organisms that lived hundreds of
millions of years ago; coal from the remains of trees and ferns, oil and natural gas from
the remains of ancient marine organisms [215]. Similarly, the “shells, body parts and
82
dead tissues” of organisms “help form sedimentary rocks” [8]. Millions of years from
now, landfills may serve an important geologic role as well, but that does not mean that
human disposal of waste in landfills or the biological disposal of waste in geologic
formations should be considered ‘recycling’.
Additionally, the destruction of organic material by fire does not seem to be
accurately likened to recycling; it more closely resembles the wasting of a potential
energy source, such as the flaring of unwanted natural gas from an oil well, for instance.
While fires play an important ecological and evolutionary role, they do this in a
somewhat more destructive way than the term ‘recycling’ suggests. Fires destroy most of
the living vegetation and organic litter in their path. They “profoundly [alter] the supply
of resources for many other species” [8], volatizing “some elements (notably carbon and
nitrogen) while converting others into biologically more available, mobile forms” [216].
Fires do not breakdown the material in their path in order to maximize its usefulness to
other biological organisms, the way recycling breaks down material for the purposes of
maximizing its usefulness in other applications. They also cause a significant portion of
biological material to become unusable by other organisms; hence, disposal of biological
material in fires cannot be accurately likened to recycling.
In conclusion, it appears that predation and decomposition can be likened to
recycling. However, the accumulation of biological materials and their formation into
fossil fuels or sedimentary rock, along with the burning of biological materials in
wildfires, cannot be accurately described as recycling.
6.3.6 Biology is resistant to damage.
Eight sources appeal to the claim that biology is resistant to damage, through
general statements referring to solutions in biology that “minimize damage profiles”
83
[121] or to specific biological organisms that are resistant to damage, such as drought-
tolerant grasses [110] and the branched design of trees with reconfigurable crowns in
high winds [217].
Upon inspection, it is clear that there is significant variation amongst species
regarding how resistant they are to different types of damage. In coral reefs, for example,
some species already show “far greater tolerance to climate change and coral bleaching
than others” [218]. Hence, it seems likely that the findings from Chapter 5 on
optimization in biology are relevant here. For each organism in question, one must
analyze the traits and selective pressures that have been historically applied to the
population to see if the population is resistant to a particular form of damage, or has
likely been optimized to become resistant to this form of damage.
6.3.7 Biology is efficient.
42 sources appeal to the claim ‘biology is efficient’, through reference to
“nature’s efficient design solutions” [62] and “highly effective and power efficient
biological mechanisms” [69]. Also, BID literature describes many biological organisms
and systems as energy or materials efficient, such as muscles [72,219,220], the legs of
horses [111], and the sensory systems of plants and animals [98].
Literature from biology, discusses a number of examples of efficiency in
biological organisms. For instance, shark skin is shape optimized to reduce energy loss
while swimming; placoid scales, also known as dermal dentricles, with certain
geometries and arrangements on the skin of sharks reduce frictional drag [18]. Jellyfish
interact with their environment efficiently; they are able to attain high swimming speeds,
while minimizing energy consumption, by releasing optimized vortices when water is
ejected through their velum during swimming [16].
84
In addition, work from Vincent et al. [11] found that biological systems solve
problems using information- and structure-based solutions, whereas problems
encountered in technology are typically solved though energy manipulation. This implies
that mechanisms in biology may be less likely to solve problems with the use of energy
than typical engineering designs.
However, biological organisms and systems are not all exceptionally efficient. As
discussed in Chapter 5, many organisms waste materials and energy on body parts that
are ‘useless’ and are present only as a result of the history of the evolutionary process; for
instance, the ancient whale Basilosaurus had unnecessary ankle bones although it did not
walk, and humans have tailbones although we do not have tails [131]. Additionally, some
significant biological energy conversion processes have seemingly very poor energy
conversion efficiencies; for example, the average conversion efficiency of photosynthesis
globally is only 0.3% [221].
Furthermore, when energy conversion efficiencies of biological and engineered
processes are compared directly, it does not appear that biological processes are more
efficient than engineered ones. For instance, French [222] states: “Flapping wings appear
to have poor propulsion efficiency compared with propellers or jets, and muscles are less
efficient than piston engines or gas turbines.” Also, a table published in Tester [221] and
adapted from Smil [223], reproduced below, makes a similar point, listing a wide range
of anthropogenic and biological energy conversion efficiencies, the most efficient of
which are anthropogenic.
85
Table 4: Efficiencies of Common Anthropogenic and Natural Energy Conversion
Efficiencies from Tester [221] and adapted from Smil [223].
However, one cannot directly compare conversion efficiencies in biology to those
in engineering because the processes serve very different functions. For instance,
comparing the energy conversion of lactation in humans to the conversion efficiency of
dry cell batteries is nonsensical.
In addition, there is reason to believe that models of biological systems used by
engineers in BID may frequently be more efficient than the biological organism they are
86
modeling. Weber et al. [224] observe that models of biological systems are frequently
idealized, and when they compared the performance of real and idealized versions of
cetacean flippers in water tunnel testing, they found that “[d]rag performance was
significantly improved by idealization.” Hence, if a final design is more likely to be
efficient when it has been inspired by an efficient analogy, a topic that will be covered in
Chapter 7, engineers conducting BID may see this efficiency advantage either by
carefully selecting an efficient biological analogy, or simply by modeling and idealizing
the biological system.
Therefore, while there are many examples of efficient biological systems and
evidence that biology is less likely to solve problems through energy manipulation than
engineered designs, it is clear that biological organisms are not all exceptionally efficient
and that biological energy conversion efficiencies are universally higher than conversion
efficiencies in engineering. However, there is evidence that the idealized versions of
biological systems used by engineers in BID are likely more efficient than the biological
system they are modeling.
6.4 CONCLUSION
Some biological organisms and traits are sustainable in the sense that they have
withstood the test of time; they have survived millions or billions of years, thereby
proving their staying power. However, most biological systems have changed
substantially over time, meaning their specific mechanisms have not been proven
sustainable in this sense, at least not on the time scales of billions of years. Additionally,
this form of sustainability is unrelated to environmental sustainability; just because
biological organisms have ‘withstood the test of time’ does not mean they are more likely
to have a low environmental impact.
87
The introduction, preservation, and flourishing of biological organisms is
typically seen as having a positive environmental impact. In the field of LCA, common
exceptions include biological organisms that are used as natural resources for humans and
are considered to have a negative environmental impact. However, many organisms in
the wild are regarded by biologists as frequently having a negative environmental impact,
including invasive species and ecosystem engineers that reduce diversity in ecosystems.
Additionally, the environmental impact of biological organisms – both positive and
negative – can be on a global scale.
Finally, some claims made in the literature regarding specific environmental-
impact related characteristics hold true while others do not. In general, biology runs on
renewable and abundant inputs, although there are a few rare exceptions to this rule. It is
not the case that biological organisms are generally nontoxic. Understanding the extent to
which biological manufacturing processes are sustainable is an extraordinarily
complicated issue, but it is clear that not all manufacturing processes in biology occur at
low temperatures and pressures. Some biological organisms do emit pollutants, and these
emissions can have a large-scale effect on the atmosphere and environment globally. It
appears that predation and decomposition can be likened to recycling, but that the
accumulation of biological materials and their formation into fossil fuels or sedimentary
rock, along with the burning of biological materials in wildfires, cannot. Biological
organisms are not universally resistant to the same types of potential damage. Finally, not
all biological organisms are exceptionally efficient, and biological energy conversion
efficiencies are not generally higher than conversion efficiencies in engineering.
88
Chapter 7: BID Benefits
46 of the 128 sources examined make claims directly about beneficial features
found in BIDs. Quotations from these accounts were grouped into two archetypal claims
and one sub-claim: (1) BIDs are optimized – 5 sources; (2) BIDs are sustainable – 43
sources, and (2a) BIDs are efficient – 12 sources. The tally for claim 2 includes the
quotations related to sub-claim 2a. A diagram depicting the relationship between the
claims is shown in the figure below.
Figure 16: Archetypal claims related directly to characteristics of BIDs.
This chapter is structured differently than previous chapters. First, each of the
claims will be introduced briefly with example quotations. The remainder of the chapter
will present caveats common to all claims.
7.1 BIDS ARE OPTIMIZED.
5 sources make statements related to the archetypal claim ‘BIDs are optimized.’
The only general statement to this effect is from Papanek [74] who asserts: “Through
analogues to nature, man’s problems can be solved optimally.” The remaining quotations
discuss examples of BIDs that perform well and exhibit desirable characteristics, such as
dragonfly-inspired airfoils [225] and robotic swarms inspired by the division of labor in
ants [68].
89
7.2 BIDS ARE SUSTAINABLE.
43 out of 128 sources appeal to the archetypal claim: ‘BIDs are sustainable’. 27
sources make general statements such as: “[B]iologically inspired materials and
structured surfaces are eco-friendly or green with minimum human impact on the
environment” [226]; “Emulation of the inherently sustainable living world through
biomimetic design potentially offers one approach to creating sustainable or, at least, less
unsustainable products” [28]; “Biological organisms, phenomena, and strategies…
provide insight into sustainable and adaptable design” [119]; and “Biomimetics…
challenges the current paradigm of technology and suggests more sustainable ways to
manipulate the world” [227]. 16 sources provide examples of sustainable BIDs, claiming
that designs for multifunctional reagents [228], architectural materials [188], and
nanomembranes [229], for instance, offer potential life cycle impact advantages as a
result of their bioinspired features.
7.2.1 BIDs are efficient.
12 sources refer to the sub-claim ‘BIDs are efficient,’ through statements such as:
“It is believed that by utilizing natural systems… current engineering solutions can be
made more efficient” [12]; and “Energy efficiency is one of the most important aspects
linking biomimetic visions with living nature” [230]. Nine sources provide examples of
energy-efficient BIDs, such as ventilation systems inspired by respiration in small birds
and mammals [231] and ceramic processing inspired by energy-efficient materials
synthesis in biology [202].
7.3 SUPPORT FOR ALL BID BENEFITS CLAIMS
Based on the many examples discussed in engineering literature, it indeed appears
that some BIDs are optimized, sustainable, and efficient as a result of their bioinspired
90
features. Many other examples not included in the theoretical study will be discussed in
detail in the upcoming chapters. Thus, these examples will not be discussed further here.
The important takeaway is that there are many such examples.
7.4 CAVEATS COMMON TO ALL BID BENEFITS CLAIMS
However, the claims presented above – that BIDs are optimized, sustainable, and
efficient – do not hold true for all BIDs. For instance, there is no reason to think that
Velcro, inspired by cockleburs [232], would be any more optimized, sustainable, or
efficient than its non-bioinspired counterparts, such as buttons and zippers.
Upon inspection, it is clear that the same set of factors plays a critical role in
determining whether a BID will have a particular desirable characteristic, regardless of
whether the characteristic in question is related to optimization, sustainability, or
efficiency. Hence, the caveats to these three claims will be examined together. Factors
that affect the likelihood of a BID possessing the desirable characteristic of interest
include: (1) whether the designer is intentionally trying to produce a design with the
desired characteristic, (2) whether the biological analogy possesses the characteristic in
question, (3) how closely the biological analogy is being imitated in the engineering
design, (4) whether the desirable feature is actually transferred to the engineering design,
(5) whether the desirable feature retains its desirable properties in the engineering design,
and (6) the nature of the unintended side effects of the desirable features in the
engineering design. Each of these issues will be discussed separately below.
7.4.1 The designer should intentionally try to produce a design with the desired
characteristic.
BID is not a magical methodology that will confer only desirable traits to final
designs without effort on the part of the designer. Gruber et al. [230] echo this sentiment
91
when they warn that the “application of a biomimetic innovation method does not
guarantee an ecological solution” and that “biomimetics… is not a panacea for all global
problems.” Stachelberger et al. [229] do the same when they state: “there is no guarantee
that a technical solution based on biomimetics will be ecofriendly,” as do Reap et al. [28]
when they explain: “Emulation of the inherently sustainable living world through
biomimetic design potentially offers one approach to creating sustainable or, at least, less
unsustainable products… however… current approaches to biomimicry do not
necessarily lead to such ends.” Haphazardly using a biological analogy in a design will
not automatically result in improvement in one’s design.
In cases where no optimization, sustainability, or efficiency advantage is intended
by practitioners of BID, there is no reason to think that the bioinspired features will
confer an optimization, sustainability, or efficiency advantage to the final design. Many
BIDs – such as gecko-inspired robots and echolocation-inspired canes – fit this model;
they involve the incorporation of many additional active energy systems inspired by the
interesting functions observed in nature. In these cases, it is clear that the bioinspired
features are causing the final engineering design to be more energy and materials
intensive – albeit with an associated increased functionality – than the design was
previously. This is because designers are using biological analogies as a way to perform
novel functions, not to perform existing functions in a more optimized, sustainable, or
efficient way.
Hence, not all BIDs are optimized, sustainable, or efficient because these
characteristics do not automatically result from using a biological analogy in the design
process and because many designers are not trying to make their designs have these
characteristics.
92
7.4.2 The pool of potential biological analogies should be scoped to those containing
the trait of interest.
Not all biological analogies are created equal. As was established in Chapter 5,
not all biological organisms and systems are optimized, let alone optimized for
engineering parameters. Likewise, Chapter 6 showed that not all biological organisms
and systems are sustainable, or possess specific sustainability-related characteristics, such
as efficiency.
If a designer has decided to conduct BID for the purposes of generating
optimized, sustainable, or efficient designs, (as opposed to more novel designs, for
instance, as was discussed in Chapter 4), he or she hopes to learn from examples of
optimization, sustainability, or efficiency in biology and use that information in the
design process. Hence, the designer needs to scope his or her pool of potential biological
analogies to only those that possess the characteristic of interest. Otherwise, there is no
information related to optimization, sustainability, or efficiency from biology that the
designer can use. For instance, if one is trying to design a more aerodynamic train profile
to handle the change from low pressure to high pressure air for the purposes of enhancing
energy efficiency, one would likely want to look at organisms that handle a similar
pressure difference efficiently, i.e. one would want to compile information on a wide
range of organisms that deal with high pressure to low pressure transitions – diving birds,
jumping fish, dolphins, etc. – determine which of these handle the pressure differences
efficiently, and then choose a profile based on this research.
A wide range of tools are available to help designers find biological analogies
relevant to their design problem. For instance, DANE, a Design by Analogy to Nature
Engine provides a library of “Structure-Behavior-Function (SBF) models of biological
and engineering systems” and has been used to aide designers in understanding biological
93
systems [233], as has a thesaurus for translating engineering functions to biological
search terms [234]. However, there are no known tools that assist designers in scoping
their pool of potential analogies to determine which have ‘optimized’, ‘sustainable’, or
‘efficient’ traits that may be advantageous to apply to their design problem.
7.4.3 One must focus on the relevant features of the selected analogy.
Similarly, designers should focus on the optimized, sustainable, or efficient
features of the selected analogy. Every potential biological analogy has many different
features that could be used in the design process. Different parts of the organism or
biological system could be imitated on a wide range of length scales – from beak profiles,
to chemical properties of a particular biological material, to its behavior while hunting in
packs. When one has selected a particular biological analogy, and has verified that it
contains the traits intended for the final design, it is critical that the entity actually being
imitated contains this trait as well. There is no use in selecting a kingfisher for its
efficient beak profile and then imitating its feathers, for instance.
7.4.4 How closely does the BID imitate the biological system?
If the BID does not closely resemble the optimized, sustainable, or efficient
feature of the biological system, it seems unlikely these desirable characteristics would be
transferred to the engineered design. Take, for instance, the example of a car frame
inspired by bone growth. If the biological analogy were used very loosely, engineers
could do a stress analysis and ensure that material in the car frame is located in areas that
are stressed, as occurs during bone growth [235,236]. On the other hand, the analogy
could be used very closely, and researchers could, for instance, grow the car frame from
some sort of ultra-strong artificial bone. Feasible engineering solutions to this problem
that take full advantage of the biological feature likely lie somewhere in the middle of
94
this continuum. The bioinspired structure of the Daimler-Chrysler bionic car, for
instance, was created using bone growth-inspired stress analysis software. In any case, if
the biological analogy is used in a very indirect way, the characteristics of interest in the
biological analogy may not transfer to the engineering design.
7.4.5 Will the desirable trait in biology transfer to engineering?
The designer must ensure that the optimized, sustainable, or efficient features of
interest can be transferred to engineering. A number of authors discuss the difficulties
transferring desirable traits from biology to engineering. Vincent [71] states: “The
transfer of a concept or mechanism from living to nonliving systems is not trivial. A
simple and direct replica of the biological prototype is rarely successful, even if it is
possible.” Muller [237] agrees, noting the “objective difficulties… in accommodating the
differences in energy… between biological and human-made systems.” In the case of
Sharklet AFTM
, for instance, which is “manufactured using a photolithographic process…
current manufacturing processes mean that… Sharklet AFTM
cannot match the
topographic and dimensional complexity of real dermal denticles” [238]. In some cases,
such issues in manufacturing biological features may prevent beneficial characteristics of
biological analogies from transferring to engineering.
7.4.6 A desirable biological trait may not continue to be desirable in a BID.
Context matters. Even if the desired characteristics of a biological analogy
transfer to engineering, these characteristics may not prove desirable in the design.
Although the laws of physics still apply to biological organisms [103,239], the constraints
facing biological organisms may be very different from the constraints facing engineered
products [120]. Biological systems are optimized “for very specific needs and
circumstances that may not reflect our requirements and unique capabilities” [240],
95
meaning they may be unsuitable for replicating directly in engineering applications.
Muller [237] agrees, observing that biological organisms are “special-purpose designs”
evolved to meet a specific set of constraints present in their environments, and
consequently they “require additional work to arrive at general principles.”
Biological traits are optimized for – or are sustainable/efficient in – a particular
environmental context. For instance, the same traits that make a polar bear ‘optimized’
for the arctic winters prove detrimental in warmer climates [241], and the same
mongoose lives sustainably in its native habitat but proves environmentally detrimental in
regions where it is an invasive species and has caused the local extinction of a number of
birds, reptiles, and amphibians [242].
Just as in biological systems, the environmental impact of a product varies greatly
depending on the particular environmental conditions where it is used. Reap et al. [243]
make a similar point when they state, in the context of LCA: “Each environment affected
by resource extraction or pollution is, to a greater or lesser extent, unique. As a result,
each local environment is uniquely sensitive to the stresses placed upon it by a particular
product system’s life cycle.” For instance, the amount of energy required to brew tea in
an electric kettle changes depending on the climate where the kettle is used, due to the
altered initial temperature of the water [244].
By translating biological features to engineering, designers remove the biological
features from the environments in which these features were beneficial. Bioinspired
products are not used exclusively in the ecological niches of the organism that inspired
them. A designer ought to consider whether the optimized, sustainable, or efficient traits
from biology will continue to prove efficient in the intended engineering context, e.g.
they should question whether reef coral’s method of manufacturing cement at low
temperatures and pressures – which is sustainable in contexts with unlimited seawater
96
[203] – really would prove sustainable in the desert environment where the cement
factory is planned.
7.4.7 Even beneficial features can have unintended detrimental effects.
Bioinspired optimization, sustainability, or efficiency advantages in engineering
designs may be countered by other, unintended effects that make the final design less
desirable as a whole. Just as in non-bioinspired sustainable design, most sustainability-
related features involve an environmental tradeoff. Whether the feature ultimately
reduces the environmental impact of the product depends on how the inclusion of the
feature affects other aspects of the product and other life cycle phases.
A number of authors discuss this issue in the context of sustainability. Benyus
[187] explains how the biomimetic process can result in an environmentally and socially
unsustainable product when, for instance, a bioinspired feature is mimicked, but no
attention is paid to the life cycle impact of other aspects of the product, such as in
materials and transportation. Along a similar line, work from Raibeck et al. [27] and
Reap et al. [28] has shown that the entire product life cycle must be considered to
determine whether a particular bioinspired feature will confer a sustainability advantage
to the product. A life cycle inventory study of a lotus-inspired self cleaning surface found
that the energy and resource efficiency gained by the bioinspired surface during cleaning
was countered by the increased need for resources and energy for the production of the
surface, ultimately resulting in no clear efficiency or environmental impact advantage
over the product’s life cycle [27].
Hence, designers must consider the potential unintended consequences of
including a desirable feature.
97
7.5 CONCLUSION
While some BIDs are optimized, have reduced environmental impacts, or are
energy efficient as a result of their bioinspired features, this is not generally the case;
many bioinspired features are unrelated to these advantages, and those that are related
only confer these advantages in certain contexts. More specifically, the likelihood that
desirable optimization-, sustainability-, or efficiency-related advantages will transfer to
BIDs increases when: (1) the designer intends to produce a design with these
characteristics, (2) the selected biological analogy contains the trait of interest, (3) the
biological features imitated in the BID also contain the trait of interest, (4) the BID
closely imitates the desirable trait from biology, (5) the desirable trait is able to be
transferred to engineering, (6) the desirable trait can continue to be desirable in a BID,
and (7) the desirable trait has few, if any, unintended effects on the engineered design
that counter the beneficial features conferred by the bioinspired trait.
98
Chapter 8: Theoretical Section Conclusion
Chapter 8 concludes Section 1, which examined the claimed benefits of BID
through careful review of biological and engineering literature. Chapter 3 presented the
methodology for the theoretical study and an overview of the claims identified. Chapters
4 though 7 examined these claims related to ideation benefits, optimization in biology,
sustainability in biology, and advantages that translate to BIDs themselves, respectively.
This chapter is broken into four sections. First, a summary of the findings from
the BID benefits study is presented. Second, claims that were identified during the course
of conducting the study, but were not analyzed, are briefly discussed. Third, the
implications of the theoretical study’s findings regarding what constitutes a biological
system in the context of BID are addressed. The section concludes with an overview of
the theoretical study and places it in context.
8.1 SUMMARY OF FINDINGS FROM BID BENEFITS STUDY
A summary of all claims examined in Section 1 and the related analysis is
provided in the table below.
Table 5: Summary of Findings from Theoretical BID Benefits Study.
Claim Findings 1. BID helps designers generate
novel ideas.
All design-by-analogy (DbA) techniques, including BID, produce
more novel concepts than standard techniques. BID may be less
likely to prompt design fixation than DbA using patents, but
information in biology may be more difficult to translate to
engineering.
2. Quantity: Biology contains
many potential analogies.
Millions of species could serve as analogies in BID. However, many
biological organisms have yet to be discovered and are therefore
inaccessible to engineers. Also, more patents have been filed
worldwide than there are species, meaning this is not an advantage
over DbA using patents.
3. Variety: Biology is diverse. Yes, but it is unclear whether there is greater diversity in biology or
engineering and, hence, whether this is an advantage over DbA using
patents.
99
Table 5, cont.
4. Relevance: Biology solves
problems engineers would
like to solve.
At least according to the engineers who make this claim and those
who use biological analogies, biology contains solutions relevant to
the problems engineers want to solve.
5. Biology solves problems
differently than engineering.
Preliminary evidence using analysis from TRIZ supports this claim.
6. Biology is optimal. Although many examples of well-adapted biological organisms exist,
organisms are not perfectly adapted for their environments. They
frequently have features that serve no purpose, and they lack features
and combinations of features that would be highly beneficial to them.
Also, since the environment is constantly changing, it is not possible
for them to be perfectly adapted to their environments at all times.
7. Biology is optimized by
evolution via natural
selection.
Natural selection helps organisms become better suited to their
environment. In some cases, this can be of engineering significance,
when the traits being selected for are aimed at reducing energy
consumption or performing a function engineers find interesting.
However, evolution via natural selection maximizes the fitness of the
organism as a whole; it does not optimize solely the specific
performance characteristics of interest to engineers. Additionally,
natural selection is countered by other evolutionary processes, such
as mutation and genetic drift, that introduce diversity into
populations. On a geologic time scale, macroevolution via natural
selection occurs, possibly selecting for highly evolvable and
adaptable blood lines capable of rapidly adapting to and surviving in
changing environmental conditions. However, selection for these
characteristics is controversial, and these types of traits are much less
likely to have applications in the design of improved engineering
systems.
8. Biology is optimized for
efficiency.
There is selection pressure, and hence optimization, for efficiency in
a number of organisms and conditions, although this is not generally
the case.
9. Biology has ‘withstood the
test of time’.
Some biological organisms and traits have survived millions or
billions of years, thereby proving their staying power. However,
most biological systems have changed substantially over time.
Additionally, ‘withstanding the test of time’ is unrelated to
environmental sustainability.
10. Biology is environmentally
sustainable.
The introduction, preservation, and flourishing of biological
organisms is typically seen as having a positive environmental
impact. Common exceptions are organisms used as natural resources
for humans. However, many organisms in the wild are regarded by
biologists as having negative environmental impacts, including
invasive species and ecosystem engineers that reduce diversity in
ecosystems.
100
Table 5, cont.
11. Biological organisms meet
specific GDGs:
a. Biological organisms use
renewable and abundant
inputs.
In general, biology runs on renewable and abundant inputs, although
there are a few rare exceptions to this rule.
b. Biological materials are
nontoxic.
It is not the case that biological organisms are generally nontoxic.
c. Biological organisms
employ sustainable
manufacturing processes.
Understanding the extent to which biological manufacturing
processes are sustainable is an extraordinarily complicated issue, but
it clear that not all manufacturing processes in biology occur at low
temperatures and pressures.
d. Biological organisms do
not pollute.
Some biological organisms do emit pollutants, and these emissions
can have a large-scale effect on the atmosphere and environment
globally.
e. Materials in biology are
recycled.
Predation and decomposition can be likened to recycling, but the
accumulation of biological materials and their formation into fossil
fuels or sedimentary rock, along with the burning of biological
materials in wildfires, cannot.
f. Biology is resistant to
damage.
Biological organisms are not universally resistant to the same types
of potential damage.
g. Biology is efficient Not all biological organisms are exceptionally efficient, and
biological energy conversion efficiencies are not generally higher
than conversion efficiencies in engineering.
12. BIDs are optimized.
While some BIDs are optimized, have reduced environmental
impacts, or are energy efficient as a result of their bioinspired
features, this is not generally the case; many bioinspired features are
unrelated to these advantages, and those that are related only confer
these advantages in certain contexts. More specifically, the
likelihood that desirable optimization-, sustainability-, or efficiency-
related advantages will transfer to BIDs increases when: (1) the
designer intends to produce a design with these characteristics, (2)
the selected biological analogy contains the trait of interest, (3) the
biological features imitated in the BID also contain the trait of
interest, (4) the BID closely imitates the desirable trait from biology,
(5) the desirable trait is able to be transferred to engineering, (6) the
desirable trait can continue to be desirable in a BID, and (7) the
desirable trait has few, if any, unintended effects on the engineered
design that counter the beneficial features conferred by the
bioinspired trait.
13. BIDs are sustainable.
a. BIDs are efficient.
101
8.2 OTHER CLAIMS IDENTIFIED BUT NOT ANALYZED
Some other ideas have been proposed in the literature, but are mentioned only
rarely, such as the potential for BID: to aid in the customization of technology [104], to
improve complex products [245], and to help create multifunctional, [137,144],
interdependent [144], more user-friendly [127,154], simpler and more elegant designs
[67,127]. Additionally, authors make a wide range of other claims: that exposing people
to biology through BID will make them more likely to care about sustainability
[137,246], that humans have learned from nature how to survive on earth and “secure a
sustainable future” [69,127], that biological materials are biodegradable [69,127,154],
that symbiosis in biology prevents resource depletion [21], and that biological organisms
themselves are novel [139] and innovative [67]. These claims were not analyzed because
few authors appealed to them.
In contrast, many sources appealed to the idea that BID has been successful in the
past. Authors in BID make statements such as: “Humans have borrowed many ideas from
biology for design” [115]; “Many successful biomimetic designs support the notion that
biology is a good source of analogies” [94]; and “Many elegant solutions to engineering
problems have been inspired by biological phenomena” [247]. Additionally, numerous
sources cite examples of technically and commercially successful BIDs, such as Velcro.
The claim ‘BID has been successful’ was not analyzed formally in the study because its
truth is evident to anyone familiar with the field of BID.
8.3 WHAT COUNTS AS A BIOLOGICAL ANALOGY IN BID?
In the process of conducting the theoretical study, it became apparent that there
are some unresolved issues in the field concerning what constitutes a legitimate
biological analogy in BID. The findings from the BID benefits study have implications
that can be applied to these issues.
102
8.3.1 Genetically Modified Organisms and Human Selection
Should genetically modified organisms (GMO) or organisms subject to human
selection processes, such as dogs, count as a biological system or an engineered one in
the context of BID? If it were true that evolution via natural selection optimizes
organisms for engineering parameters, or that biological organisms automatically possess
certain sustainability-related benefits, then a designer may not wish to use a GMO or a
species that has clearly been subject to human selection processes. However, the analysis
in Chapters 5 and 6 shows that these generalizations do not hold. Hence, the benefits of
using a GMO or an organism subject to human selection are just as likely to produce a
BID with advantageous features. In fact, since GMOs and organisms subject to human
selection have somewhat more conscious intent, it may be clearer to the designer what
these organisms have actually been selected – or ‘optimized’ – for.
8.3.2 Extinct Species
As discussed in Chapter 5, a number of BID authors claim that ‘fossils are
failures’ and organisms currently living have features that make them better suited for life
on earth. Authors who ascribe to such a view would not consider extinct species to be
legitimate biological analogies because they do not believe extinct species possess the
desirable characteristics that make the use of biological analogies in the design process
advantageous. For instance, some argue that the evolution over billions of years has
optimized organisms currently living. Since extinct organisms have not survived
‘optimization’ via evolution, it would not be appropriate to use extinct species when
conducting BID.
However, Chapter 5 showed that organisms can go extinct for a number of
reasons unrelated to their suitableness from an engineering standpoint. It also showed that
the evolution via natural selection over shorter time periods to help a species become
103
better adapted to a particular ecological niche is the type of optimization in biology
related to engineering parameters, not evolution over billions of years. Hence, the use of
extinct species in the design process is just as likely to produce a beneficial engineering
design as the use of a living species.
8.3.3 Tools and Artifacts of Animals
“Science has documented a number of bona fide cases of tool use by nonhuman
species, such as apes, sea otters, birds, and insects” [1]. Do the buildings, tools, and
artifacts of animals count as ‘biology,’ in the context of BID? The answer has
implications for some of the frequently-cited examples of BID, such as Eastgate Centre’s
cooling system, inspired by termite mounds, not termites themselves.
On one hand, some biologists view tools and artifacts as part of an organism’s
biological system that plays an important evolutionary role and has an impact on a
creature’s fitness. “[P]roducts of animal engineering [are] extensions of species'
phenotypes and hence subject to natural selection, including caddis-fly cases, termite
mounds and birds' nests” [8]. If the source of the value of BID lies in the evolutionary
process, then the tools and artifacts that evolve with creatures - such as termite mounds,
beaver dams, monkey sticks, the stones Egyptian vultures drop on eggs [248]– would all
be considered. Termites have evolved to build mounds that allow for proper ventilation
and maintain appropriate temperatures; mounds with temperatures too high or too low are
likely to harm the termites’ ability to survive and reproduce. Additionally, like biological
systems, the tools and artifacts used by most non-human biological systems are made of
plentiful, locally-available materials and run on sunlight. Consequently, it would seem as
though these things have a place as analogies in BID and sustainable BID.
104
On the other hand, this framework would also lead one to include the tools and
artifacts of humans, since humans are also animals. “Genetically, anatomically,
behaviorally, and socially, we have been shaped through natural selection into tool
makers and tool users” [1]. Hence, Hummers, data centers that require lots of cooling
located in Nevada, swimming pools, paper processing, batteries, landfills, cell phones,
bottled water, plastic shopping bags, and lawn fertilizers should all be included. This is
an unintuitive result.
8.4 FUTURE WORK
Biology is a complex and fascinating field, and there are many topics that merit
further research by those interested in developing effective BID tools and methodologies.
In particular, a number of topics arose during the writing of this work related to
optimization in biology that could be explored more fully. Despite fear that doing so will
perpetuate more myths about biology that have not been fully researched, these topics are
outlined briefly below.
It could be highly beneficial to restrict one’s pool of potential biological analogies
to those that have proven adaptively significant, i.e. traits that arose via natural selection
and hence confer a fitness advantage to the organisms that possess them. As was
previously discussed in Chapter 5, it is not always easy to identify instances of adaptively
significant features because of other forces, like biased mutation, that cause non-adaptive
traits to increase in frequency in a population. However, developing a better
understanding of mutation rates and how they can be used to identify cases of true
optimization in biology may prove beneficial. Hodgkinson and Eyre-Walker [149] state:
“Characterizing variation in the rate of mutation… is key to many questions in
evolutionary biology, including… the detection of adaptive evolution.”
105
Additionally, ‘key innovation’ is a term in biology that refers to evolutionary
modifications in structure or function that allow a lineage to “exploit the environment in a
new or more efficient manner” [131] or that are “aspects of organismal phenotype that
promote diversification” and ultimately “may enhance competitive ability, relax adaptive
trade-offs or permit exploitation of a new productive resource base” [249]. Upon a brief
analysis, this appears to be very similar to, or the same as, an adaptively significant trait.
Examples include the evolution of wings, which opened “novel adaptation zones… for
ancestors of birds and bats” [131]. Assuming this is indeed the case, by including the
search term ‘key innovation’ in their internet searches for appropriate biological
analogies, for instance, engineers may be more likely to focus on functionally-significant
features that confer a significant benefit to a particular species in a particular
environmental context, either associated with increased functionality or increased
efficiency.
Finally, instances of morphological convergence could potentially point to
biological features that have been optimized, and also might be more likely to be
optimized for engineering parameters. ‘Morphological convergence’ “refers to cases
where dissimilar body parts evolved in similar ways in evolutionarily distant lineages”
[131]. For example:
The differences between bat, bird, and insect wings are evidence that each of
these animal groups adapted independently to the same physical constraints that
govern how a wing can function in the environment. The wings of all three are
analogous structures. They are not modifications of comparable body parts in
different lineages. They are different responses of dissimilar parts to the same
challenge. [131]
When unrelated organisms evolve similar features, it seems much less likely that these
features are arising in response to common physical challenges. The similarities between
these organisms are likely to point toward some sort of optimum, if the same result keeps
106
appearing, the way starting an optimization problem with different initial conditions and
arriving at the same conclusion indicates that one has found the true optimum. It also
means that the design, which is ‘optimal’ in many different environments, is more likely
to be optimal worldwide, the way engineered products strive to be – instead of just in one
particular ecological niche, the way most biological organisms are optimized.
Of course, all of these topics require much further research, but they may provide
promising avenues for researchers wishing to take this work a step further.
8.5 CONCLUSION
By examining and qualifying the claimed benefits of BID, this section has
contributed to the underlying theory of BID, a topic which few other authors have
addressed in depth. It is critical to have such a theory to guide researchers in the BID
community towards fruitful methodologies and procedures that best leverage biology in
engineering design. While this work is undoubtedly imperfect, it hopefully can serve as a
starting point to openly discuss assumptions and controversies in BID and eventually
arrive at a comprehensive theory of how and why biology can be used to improve
engineering designs.
Now we shift our focus away from the claimed benefits of BID, towards an
assessment of the actual sustainability-related benefits of BID, as observed through
implemented designs.
107
Chapter 9: Research Methods to Find Trends in BIDs
Chapter 9 begins Section 2 of this work, which focuses on the identification of
trends in existing sustainable BIDs. Chapter 9 presents the research methodology for the
first empirical study.
The purpose of this study is to analyze existing sustainable BIDs using green
design guidelines (GDGs) to identify sustainability-related trends. To do this, a list of
existing BIDs was compiled using two different search techniques. Information on the
BIDs was collected, and designs that did not meet selection criteria were eliminated. The
remaining designs were then analyzed to identify their bioinspired sustainability solutions
and find trends. This procedure is presented in Figure 17 and is discussed in detail below.
Figure 17: Overall research methodology for identifying sustainable design solutions in
existing BIDs.
108
9.1 STEP 1: COMPILE A LIST OF BIDS
Two search methods were used to compile a list of existing BIDs – a general,
‘breadth’ search technique and a snowballing-type ‘depth’ search technique. These two
methods were used to ensure that, to the greatest extent possible, the designs analyzed
were a representative sample of BIDs of interest. For this study, only bioinspired physical
products were considered. Consequently, bioinspired elements of computer science,
artificial limbs, and bioinspired methods of social organization, for instance, were not
considered.
9.1.1 Breadth Search
The breadth search involved searching for and comparing lists and databases of
BIDs from general sources. This method was used to ensure that a wide range of
bioinspired products were identified and to increase the variety in the final sample of
BIDs selected for analysis. The technique used here is a form of nonprobability sampling,
“a sampling technique in which units of the sample are selected on the basis of personal
judgment or convenience” [250]. The disadvantage of nonprobability sampling is that
“the probability of any member of the population being chosen is unknown” and “there
are no appropriate statistical techniques for measuring random sampling error from a
nonprobability sample. Thus, projecting the data beyond the sample is statistically
inappropriate” [250]. These disadvantages apply in this study as well. While this search
technique helps introduce breadth into the study, it does not guarantee that the final list
compiled is truly representative of the population of existing BIDs.
The following general sources were used: Wikipedia’s page for ‘Bionics’ [10],
AskNature.org’s database of biomimetic products [251], Bioinspiration and Biomimetics
(vol. 6, no. 1 [252] and vol. 5, no. 4 [253]), and a Japan Times Online article “Natural by
Design” [254]. Selected sources were read, and any examples of BIDs of interest
109
provided in these documents were recorded along with their biological analogy and
source.
Some of the sources selected for the general search are peer-reviewed, some not.
Although content on sources such as Wikipedia is user-submitted and not peer-reviewed,
it is acceptable for use in this case because the general search is followed by rigorous
verification with peer-reviewed sources. The disadvantage of using untrustworthy sources
at this stage is that there is a greater chance that the designs identified in these sources
cannot be substantiated and will later be eliminated, wasting time. The advantage of
using these sources is that they give a broad overview of the field and the types of
designs available.
9.1.2 Depth Search
Subsequently, another search technique was used to ensure depth of results. This
depth search technique is in some ways similar to the snowballing search technique used
in the social sciences to hone in on relevant data. Snowball sampling is “a sampling
procedure in which initial respondents are selected by probability methods and additional
respondents are obtained from information provided by the initial respondents” [250].
Snowball sampling cannot be used as the only search technique because doing so
could significantly bias the search. For instance, if the first BID found were dolphin-
inspired boat hulls and the snowballing technique was then used, materials-based or
dolphin-inspired designs would likely be substantially overrepresented in the sample.
However, the snowballing technique identifies good potential designs more quickly than
general search techniques.
Snowballing searches were conducted based on keywords found in the promising
results of the general search. For instance, the Wikipedia page for ‘Bionics’ used in the
110
general search, states: “Examples of bionics in engineering include the hulls of boats
imitating the thick skin of dolphins” [255]. A Google search of “bioinspired dolphin boat
hulls” provides two scientific articles related to BIDs. The first: “Analysis and
Classification of Broadband Echoes Using Bio-inspired Dolphin Pulses” is related to
dolphins, boats, and bioinspiration and provides the additional examples of a “biomimetic
dolphin based sonar system” and “bio-inspired pulses developed from observations of
bottlenose dolphins” [256]. The second: “Bioinspired Materials for Self-Cleaning and
Self-Healing” was related to bioinspired materials and provides the additional examples
of “composite materials with nacre-like flaw tolerance,” “gecko-inspired reversible
adhesives,” “advanced photonic structures that mimic butterfly wings,” self-cleaning
materials inspired by the lotus leaf, self-healing materials “inspired by living systems in
which minor damage (e.g., a contusion or bruise) triggers an automatic healing response,”
self-cleaning windows, and self-cleaning boat hulls, among others [257]. Each of these
potential BIDs can then be investigated in peer-reviewed literature. A simplified
depiction of this search is shown in the figure below.
111
Figure 18: A snowball sampling search starting with the term “dolphin skin boat hulls” is
more likely to return results related to dolphins or boat hulls than a
randomly-selected and unrelated BID, like “gecko-inspired adhesives.”
Photo credits:[258-263].
9.2 STEP 2: INFORMATION COLLECTION
A wide range of information was collected on the BIDs considered for analysis.
This information is catalogued in ‘Design Library’ entries found in Appendices A-C.
These entries include statements from designers, messages on product websites, patent
claims, journal papers, and books. These sources tell the story of the bioinspiration
process, explain how the design operates, identify competing products, describe how
competing products operate, provide data on the environmental impact of either the BID
or its competing product, and discuss the physical or biological principles that came into
play during product design.
112
Most products analyzed have many different potential competitors. In general,
only one competing product was chosen for comparative analysis, allowing for a more
simplified comparison process. Without a specific competitor in mind, it would be very
difficult to identify sustainability solutions in the BIDs. When there were multiple
competing products, the following types of products were preferred: those with large
market shares, those identified by the designer or company producing the BID as the
intended competitor, those that were the most similar to the BID, and those with easily
accessible information. For instance, in this analysis, self-cleaning surfaces inspired by
the lotus leaf were compared to standard surfaces cleaned using spray and ultrasonic
cleaning methods. These two competing methods were both selected because life cycle
data was available to compare these three methods in a paper from Raibeck et al. [27].
Additionally, Eastgate Centre’s bioinspired passive cooling system was compared to an
electric air conditioner for a building of a similar size in the same location.
9.3 STEP 3: SELECTING DESIGNS TO ANALYZE
The full set of selection criteria is provided in the table below. A detailed
explanation of each criterion follows. During the information collection stage, if a design
was found not to meet one of the criteria described below, it was set aside and not
researched further.
113
Table 6: Design Selection Criteria
1. There must be documented evidence from reputable sources that the design is truly
bioinspired.
2. The design must be feasible.
3. There must be evidence in peer-reviewed literature that the design has a reduced
environmental impact as a result of its bioinspired feature in at least one stage of its
lifecycle, compared to functionally-equivalent competing products.
9.3.1 Criterion 1: The design is bioinspired.
The first criterion, requiring documented evidence from reputable sources
indicating the design is truly bioinspired, is used to ensure that all the designs analyzed
belong in the population of BIDs. This criterion was deemed necessary because
bioinspired status is not a measureable quality that can be determined by looking at the
design itself. It is instead a quality related to the process undergone by the designer.
Given the trendiness of bioinspiration and the enthusiasm people have for it, there is
reason to believe that within the vast expanse of gray literature on the topic, some designs
are misrepresented as bioinspired when, in fact, they are not.
Additionally, even within the realm of authoritative literature on BID there are
discrepancies between different researchers regarding whether specific designs should be
considered bioinspired. For instance, Philip Ball, in a 2001 article in Nature [68], states
that the Eiffel Tower was inspired by bone structure while Julian Vincent et al., in a 2006
article in Journal of the Royal Society Interface [11], state that there are myths that the
Eiffel Tower was inspired by the human femur or a tulip stem, but that it was actually just
designed to resist wind loading. Neither source provides a citation for their statements.
Logically, Ball and Vincent’s contradictory statements cannot both be right. Being
114
incorrect in this case has very little impact on the validity of the work of the authors; in
both cases, the Eiffel Tower was used only as an example to illustrate what BID is (or is
not). However, if this problem is a common one, it could have a large impact on studies,
such as this one, that analyze many BIDs together.
Firsthand accounts from designers or parent companies stating that a design is
bioinspired constitute sufficient evidence to show that a design is truly bioinspired.
Information of this type is frequently found in newspaper interviews with the product’s
inventor, academic papers written by the inventor, patents and patent applications, and
company websites. For instance, to show that Sharklet antibacterial surfaces are truly
bioinspired, Sharket’s website [264], Sharklet patents [265,266], or peer-reviewed papers
from one of Sharklet’s founders, Anthony Brennan [267], are all widely available and
could be used. It is much more challenging to verify older designs, such as the Eiffel
Tower, are truly bioinspired because the inventor can no longer be asked if these designs
were bioinspired or not, and firsthand accounts of the design process are more difficult to
find.
9.3.2 Criterion 2: The design is feasible.
The second criterion, that the design must be feasible, is included to ensure the
findings of the study are limited to those sustainability characteristics that actually can be
transferred to engineering. Frequently, the designs selected are commercially-available
products or a fully-functional prototype, ensuring that they are indeed feasible.
The additional benefit of designs that have clearly been established as feasible is
the increased accuracy with which a product’s mechanisms and environmental impact
can be ascertained. As will be explained in further detail shortly, GDGs are used in this
study to compare the environmental impacts of two products. Since GDGs are used
115
instead of LCA, it is not necessary to have extremely detailed information on all stages of
the products life cycle, as was discussed in Chapter 2. However, it is still incredibly
beneficial to know what the final parts are, what material they are made of, how they are
manufactured and assembled, whether they can be recycled, how much energy they
consume during use, etc. Before a fully-functional prototype exists, many of these aspects
of the product have not yet been determined. Hence using fully-functional prototypes and
commercially available products likely greatly improves the accuracy of the assessment.
9.3.3 Criterion 3: Proof of a reduced environmental impact.
The third criterion is that there must be evidence in peer-reviewed literature that
the design has a reduced environmental impact as a result of its bioinspired feature in at
least one stage of its lifecycle, compared to functionally-equivalent competing products.
Currently, it is trendy to label products as ‘sustainable’ and ‘bioinspired’ for marketing
purposes; there is also a misconception that all BIDs are more sustainable than
alternatives, as was discussed in Chapter 7. The third criterion is used to avoid products
that, in fact, offer no proven environmental advantage as a result of their bioinspired
features.
For example, Velcro is truly a BID [232]. However, when compared to its
competitors – buttons and zippers – there is no logical or fundamental reason why Velcro
would offer a sustainability advantage. There is no evidence in peer-reviewed literature
that Velcro has a reduced environmental impact compared to its competitors as a result of
its bioinspired features. Consequently, Velcro is not included in the analysis.
9.4 ANALYZING INDIVIDUAL DESIGNS USING GREEN DESIGN GUIDELINES (GDGS)
After verifying that the BIDs met the three criteria stated above, and after all
required information had been collected, the designs and their competing products were
116
analyzed using a compilation of 65 GDGs [61]. This analysis was performed by two
researcher independently, using the ‘Design Library’ entries as a resource to learn about
the features of the BIDs and their competing products. These GDGs are reproduced in
Appendix D. The GDGs provide a way to compare the environmental impact of BIDs
with their non-bioinspired equivalents, from the standpoint of a conceptual designer. It is
advantageous to use GDGs instead of LCA tools for this purpose because GDGs are
intended to be used during conceptual design, as are biological analogies, and GDGs are
much faster to use than LCA tools.
For instance, Eastgate Centre, a shopping center and office building in Harare,
Zimbabwe, constructed by Arup and designed by Pearce Partnership, was analyzed using
the GDGs. Instead of having a standard industrially-sized air conditioner, Eastgate Centre
is designed to have a passive cooling system, assisted by fans [29], that mimics cooling in
termite mounds [33,30]. Heat from the building’s people and machinery rises, causing
thermosiphon flow within the building; chimneys on the roof, above the boundary layer
of the wind, prompt induced flow, drawing hot air out the chimney and cool air in at
ground level [34]. According to Arup, Eastgate consumes approximately 50% of the
energy consumed by a comparable building with an air conditioner in Harare [32]. For
the purposes of this analysis, Eastgate Centre was compared to a theoretical similarly-
sized office building in Harare with an industrial-sized electric air-conditioning system.
Consequently, the reduction in energy consumption seen by Eastgate Centre is associated
with a reduction in electricity consumption by the building.
In 2008, the most recent year for which data is available, approximately 53% of
electricity in Zimbabwe came from hydropower, 46% from coal and peat, and the
remainder from petroleum [268]. In general, hydropower is considered a renewable
energy resource because the supply of freshwater in rivers that generate hydropower is
117
naturally replenished. However, these resources are vulnerable to climate change and
extreme weather events, such as drought. Additionally, while the relative environmental
impact of hydropower compared to other electricity resources is small, there are still
significant carbon emissions associated with the construction of dams and flooding of
land for dams, as well as an impact on wildlife in the rivers.
Coal, peat, and petroleum are all nonrenewable fossil fuel resources. Coal and
peat are relatively abundant in Zimbabwe while petroleum is not; over the last 40 years,
Zimbabwe has consistently been able to supply enough coal and peat to meet all of its
own needs, but its oil demand has been wholly supplied by imported sources [268]. Coal,
peat, and oil all have well-know environmentally-damaging effects, particularly with
regard to greenhouse gas emissions.
Figure 19: Example GDG comparison. Photo credits: [36,37].
118
Eastgate performed better than this competing building with regard to five GDGs,
three of which are depicted in the figure above and will be discussed further here. It
performed better with regards to GDG #1:“Specifying renewable and abundant
resources” [61], because air circulation in Eastgate occurs as a result of the buoyancy
properties of the air and the geometric design of the building, allowing for a substantial
reduction in electricity consumption when compared to an industrial air conditioning unit.
The buoyancy of air is both renewable and abundant, compared to the electricity needed
to power an industrial air conditioner. Eastgate meets GDG #11: “Specifying the cleanest
source of energy” [61], better than a building with an air conditioning system for similar
reasons, because it uses geometry and waste heat from buildings along with assisting fans
instead of relying much more heavily on electricity from environmentally-damaging
sources. Eastgate meets GDG #32:“Interconnecting available flows of energy and
materials within the product or between the product and its environment” [61] better than
the competitor because the waste heat from the building is used to drive thermosiphon
flow, and the higher velocity of the air at the top of the chimney drives the induced flow.
In contrast, air conditioners typically are stand-alone units, not designed to take
advantage of the physics of site-specific fluid flows.
9.5 CONCLUSION
Chapter 9 presents the methodology used in the empirical study. This study is
aimed at identifying trends in existing sustainable BIDs. This chapter covers the way in
which a list of potential BIDs was compiled, the type of information that was collected
for the considered designs, the criteria used to select designs for analysis, and the manner
in which the environmental impact of BIDs and their competitors were compared.
119
Chapter 10: Data and Analysis of GDG Trends Study
Chapter 10 presents the data collected from the methodology presented in Chapter
9, along with analysis of the GDG-related trends present in the sustainable BIDs. This
includes a list of BIDs compiled using the depth and breadth searches, the aggregate data
from the GDG study, and a discussion of the results of the study in the context of other
research.
10.1 BREADTH AND DEPTH SEARCH RESULTS
The results of the depth and breadth searches for potential BIDs are shown in
Appendix F. The first six lines of this table are shown in the table below. The BID is
listed, along with the biological system that inspired the design and a list of the sources
that identify this design as ‘bioinspired’.
Table 7: The first six BIDs considered for analysis. The complete version of this list is
provided in Appendix F.
# Design Inspired By Sources
1 Dirt and water-repellent paint/coating Lotus leaf
[11,269-271]
2 Boat hulls Dolphin skin [271,272]
3 Sonar/radar Echolocation of bats [271]
4 Medical ultrasound imaging Echolocation of bats [271]
5 Velcro Burs, burdock plant [11,269,271,273]
6 Horn-shaped, saw-tooth design for
lumberjack blades
Wood-burrowing beetle [271]
Overall, 194 potential BIDs were identified, from 93 different academic and non-
academic sources and 27 different authors. 95 potential BIDs were identified from the
breadth search, with an additional 98 coming from the depth search. When a design was
named in multiple sources during the breath or depth searches, it was counted only once.
The list of designs has breadth; it represents examples from a broad range of
fields – architecture, materials science, mechanical engineering, and electrical
120
engineering, to name a few. Additionally, the list of potential BIDs has depth; a number
of the potential BIDs use the same biological analogies for different purposes, and a
number perform the same task using different analogies.
10.2 HOW BIDS RESEARCHED IN DEPTH FARED AGAINST SELECTION CRITERIA
Of the 194 BIDs listed, only 30 were researched in depth to see if they met the
criteria discussed in Chapter 9, due to time constraints and the lack of available
information for some of the designs. A list of these 30 BIDs is provided in Table 8 below.
The table is color-coded, with the color of the row indicating the extent to which the
design met the three selection criteria. Green (rows 1-9) means the BID met all 3 criteria
and was analyzed using the GDGs. Yellow (rows 10-22) means the design was
researched, but it is still unclear whether it meets all criteria due to deficiencies in
information collected. Grey (rows 23-28) means that the item was researched but did not
meet all criteria. Red (rows 29 and 30) means the item may have a much larger
environmental impact because of its bioinspired feature. An asterisk* in front of the
number of the design indicates that there is a ‘design library’ entry for that the design in
one of the appendices, as explained below.
10.3 DESIGN LIBRARY
The designs listed in the table above with an asterisk have a ‘design library’ entry
in one of the appendices, where all information related to that design was collected and
synthesized. Appendix A contains the design library entries for the nine designs
presented above in green that were selected for GDG analysis because they met all three
design selection criteria. Appendix B contains six entries for the designs presented above
in yellow that were close to containing enough information to be analyzed, but lacked
some significant detail. Appendix C contains three example entries for designs presented
121
Table 8: Designs researched thoroughly and how they fared against the selection criteria.
# Design Inspired By Sources *1 Self-cleaning transparent thin film Lotus leaf
[11,269-271]
*2 Eastgate Centre cooling system Termite mound [35,269,271,274]
*3 Biolytix filter Natural decomposition on a
river’s edge
[275]
*4 Daimler-Chrysler bionic car - shape Boxfish [269,273,274,276]
*5 Daimler-Chrysler bionic car -
structure –SKO method
Initially, adaptive growth of
trees; later bones
[11,274,276,277]
*6 Interface Flor i2 Entropy carpet Forest floor [278,279]
*7 Sharklet antimicrobial surface Shark skin [269,280,281]
*8 Shinkansen 500 series nose cone Kingfisher [254,269,277,282]
*9 Shinkansen 500 series pantograph Owl [254,283]
*10 Airbus 320 Shark skin riblets [113,273]
*11 Baleen water filters Blue whale [284]
*12 Calera cement Skeletons of marine
animals
[285,286]
*13 Geckel Geckos and mussels [270]
*14 HotZone radiant heater Lobster eyes [287]
*15 Passive walking bipedal robots Humans [273]
16 Adhesives Gecko feet [11,269,271,273]
17 Aircraft wings with reduced drag,
Airbus A380
Divided wing tip of birds
with wings of low aspect
ratio (buzzard, vulture,
eagle)
[11,288]
18 Boat hulls Dolphin skin [271,273]
19 Mirasol color electronic screens Morpho butterfly wings [273,289]
20 Pelamis wave converter –
Aguacadoura wave farm
The redundant vertebral
units of snakes
[270]
21 Sonar/radar Echolocation of bats [271]
22 Wood glue without toxins -
Columbia Forest Products
Secretions mussels use to
cling to surfaces
underwater
[290]
*23 Crystal Palace in London Giant water lily [11,68,291]
*24 Eiffel Tower Trabecular struts in the
head of a human femur or
the taper of a tulip stem
[68,11]
*25 Velcro Burs, burdock plant [11,269,271,273]
26 CAO Software Initially bones; later trees [274,276,277]
27 Sharklet Marine boat hull coatings Shark skin [281]
28 Sharklet Medical devices Shark skin [281]
29 Robocane Ecolocation [270]
30 Sonar system Dolphins [256,270]
122
above in grey that had sufficient information but did not meet all three criteria. These
entries can be used as a reference for others trying to locate information on those designs
in particular or locating large numbers of BIDs.
Where available, the following information is presented in each design library
entry: (1) an overview listing the BID, biological analogy, competing product, and
environmental advantage of the BID, (2) a description of the biological analogy, (3) a
description of the bioinspired feature, (4) quotations showing that the BID meets all three
design selection criteria, (5) a description of the competing product, and (6) a written
comparison of the environmental impact of the BID versus its competitor.
10.4 AGGREGATE DATA FROM GDG ANALYSIS
The environmental impacts of the nine BIDs that met all three selection criteria
were compared to their non-BID competitors using the GDGs. A table presenting the full
results of the GDG analysis with justification is provided in Appendix G. A summary of
the results is provided in the table below. A green box with a ‘B’ indicates the BID met
the GDG better than the competing product. A red box with a ‘W’ indicates the BID
performed worse on the guideline. Likewise, a yellow box with ‘U’ indicates it is unclear
which is better but there is reason to believe there could be a difference, and an empty
box implies that no difference is anticipated.
123
Table 9: Summary of GDG Analysis, Organized by both GDG and BID.
Part 1: GDGs 1-33 Part 2: GDGs 34-65
# 1 2 3 4 5 6 7 8 9 # 1 2 3 4 5 6 7 8 9
Gre
en
De
sign
Gu
ide
line
s (G
DG
s)
50
0 S
eri
es
Shin
kan
sen
Pan
togr
aph
50
0 S
eri
es
Shin
kan
sen
no
se c
on
e
Dai
mle
r-C
hry
sle
r C
on
cep
t C
ar S
hap
e
Dai
mle
r-C
hry
sle
r C
on
cep
t C
ar S
tru
ctu
re
East
gate
Ce
ntr
e C
oo
ling
Syst
em
Self
-Cle
anin
g Su
rfac
e
Shar
kle
t A
nti
mic
rob
ial S
urf
ace
Bio
lyti
x B
iow
ate
r Fi
lte
r
Inte
rfac
eFL
OR
's e
ntr
op
y ca
rpe
t ti
les
Gre
en
De
sign
Gu
ide
line
s (G
DG
s)
50
0 S
eri
es
Shin
kan
sen
Pan
togr
aph
50
0 S
eri
es
Shin
kan
sen
no
se c
on
e
Dai
mle
r-C
hry
sle
r C
on
cep
t C
ar S
hap
e
Dai
mle
r-C
hry
sle
r C
on
cep
t C
ar S
tru
ctu
re
East
gate
Ce
ntr
e C
oo
ling
Syst
em
Self
-Cle
anin
g Su
rfac
e
Shar
kle
t A
nti
mic
rob
ial S
urf
ace
Bio
lyti
x B
iow
ate
r Fi
lte
r
Inte
rfac
eFL
OR
's e
ntr
op
y ca
rpe
t ti
les
Gre
en
De
sign
Gu
ide
line
s (G
DG
s)
1 B B B 34
2 B 35
3 36
4 B 37
5 B 38
6 39
7 W 40 B
8 B B 41 B B U
9
B B B 42 B
10 U U B 43
11 B B 44
12 45 B
13 46
14 47
15 48
16 49
17 B 50
18 B B 51
19 W 52
20 B 53
21 54
22 W 55 W
23 56
24 W 57
25 B U B 58 B
26 59
27 B B 60
28 B B B B B B B 61
29 62
30 63
31 64
32
B B B
65
33
124
Similarly, a summary of the GDGs met better by each of the BIDs, organized by
BID, is provided in the table below.
Table 10: GDGs met better by the BIDs.
Bioinspired Design Comparison Product GDGs Met
Better By BID
Biolytix Filter Septic tank 1, 2, 4, 9, 10, 18,
25, 28, 32, 41
Daimler-Chrysler Bionic Car Shape Shape of BMW 3 Series
Sedan 28
Daimler-Chrysler Bionic Car Structure Standard car frame 17, 18, 27, 28
Eastgate Centre Cooling System Electric air conditioner 1, 11, 28, 32
Interface FLOR i2 Entropy Carpet Conventional modular
carpet 5, 20, 40, 45, 58
Self-Cleaning Transparent Thin Film Standard surface, spray
and ultrasonic cleaning
1, 9, 11, 25, 27,
28, 32
Sharklet Antimicrobial Surface Clorox disinfectant
bathroom cleaner 9, 41, 42
Shinkansen 500 Series Nose Cone Shinkansen 300 Series
nose cone 8, 28
Shinkansen 500 Series Pantograph Standard pantograph
without serrations 8, 28
A number of trends were uncovered related to the GDGs that were most
frequently met superiorly by the BIDs compared to their non-BID competitors.
Seven out of 9 BIDs met GDG #28: “Specifying best-in-class energy efficiency
components” [61] better than competitors. For instance, Eastgate Centre met GDG #28
better than an office building in Harare of similar size with an electric air conditioner
because less active energy needed to be brought into the system to get the same amount
of cooling [32].
125
Additionally, 3 GDGs were met better by the BIDs as a result of their bioinspired
features for 3 out of 9 design pairs: (1) GDG #1: “Specifying renewable and abundant
resources,” (2) GDG #9: “Specifying non-hazardous and otherwise environmentally
“clean” substances, especially in regards to user health,” and (3) GDG #32:
“Interconnecting available flows of energy and materials within the product or between
the product and its environment” [61]. For instance, Biolytix met GDG #32 better than
non-BID alternatives because the flow of waste material through the system is
interconnected with the filtration function. As the waste is filtered, it becomes the humus,
which then serves as the filter for the next batch of waste [292]. Additionally, the
Biolytix system itself – which is filled with worms and insects – functions much as a
miniature soil ecosystem, where the living organisms that are a part of the product are
interconnected with the filtering and treatment functions to a greater extent than occurs in
standard septic systems [293,292].
Finally, 6 GDGs were met better by 2 out of 9 BIDs: (1) GDG #8: “Installing
protection against release of pollutants and hazardous substances,” (2) GDG #11:
“Specifying the cleanest source of energy,” (3) GDG #18: “Specifying lightweight
materials and components,” (4) GDG #25: “Implementing reusable supplies or ensuring
the maximum usefulness of consumables,” (5) GDG #27: “Minimizing the volume and
weight of parts and materials to which energy is transferred,” and (6) GDG #41:
“Ensuring minimal maintenance and minimizing failure modes in the product and its
components" [61]. For example, lotus-inspired self-cleaning surfaces met GDG #25
better than standard surfaces that were spray cleaned or cleaned using ultrasonic aqueous
cleaning methods because self-cleaning surfaces minimize the volume of water consumed
during cleaning [27]. Additionally, the structure of the Daimler-Chrysler bionic concept
car met GDG #27 because the bioinspired SKO method reduces the weight of the car’s
126
frame [41,294]. Since energy is transferred to the frame in the process of moving the car,
the bioinspired frame minimizes “the weight of parts and materials to which energy is
transferred” [61].
A diagram depicting these guidelines most frequently met better by the BIDs,
compared to their non-BID competitors, is shown in the figure below.
Figure 20: Trends related to the GDGs most frequently met better by the BIDs than their
competitors.
127
10.5 VALIDATION OF GDG RESULTS
The GDG analysis was validated by having different researchers independently
conduct the analysis and through the comparison of their combined results with related
work of others in the BID community.
10.5.1 Independent Raters
The GDG analysis was performed independently by two researchers – the author
and an undergraduate mechanical engineering student – to ensure the repeatability of the
results. Both researchers had access to the design library entries for the designs analyzed,
the sources cited in the design library entries, and Telenko’s master’s thesis [61], which
contains a detailed explanation of each GDG with examples. Both researchers also
performed internet searches to better understand the designs. The analysis for Eastgate
Centre was provided as a training example to the undergraduate researcher and,
consequently, was not arrived at using this method.
After the GDG analysis had been performed independently, the results of the two
raters were compared, and areas of disagreement discussed. Most disagreements in
ratings were caused by differing interpretations of the GDGs. For instance, one rater
interpreted GDG #25: “Implementing reusable supplies or ensuring the maximum
usefulness of consumables” [61] as applying to cases in which the need for energy inputs
was reduced. In this case, the rater interpreted energy inputs as ‘consumables.’ Upon
consultation with the other rater and others more familiar with the guidelines, it was
determined that energy would not be considered a ‘consumable’ in this sense, and the
reduction in energy inputs would instead be accounted for under GDG #28: “Specifying
best-in-class energy efficiency components” [61]. Most other disagreements had to do
with differences in information concerning the designs themselves. These disagreements
were quickly resolved with the other rater reading the source containing the information
128
of interest and a collective judgment being made related to the new source’s legitimacy
and the information’s relevance to the guideline in question.
10.5.2 Comparison of Results with Other Work
In some cases, it was also possible to validate the results of this study using the
work of other researchers. In particular, a 2010 paper from Wadia and McAdams [62]
and Wadia’s 2011 thesis [63], both discussed in Chapter 2, present studies where BIDs
were analyzed and either biomimetic design guidelines [62] or biomimetic design
principles [63] were generated. Additionally, this work analyzes some of the same BIDs
analyzed here – including Eastgate Centre, the shape of the Daimler-Chrysler bionic
concept car, the nose cone of the Shinkansen train, the lotus-inspired self-cleaning
surface, and the Shinkansen’s pantograph.
Specifically, one of the biomimetic design principles presented in Wadia [63] –
“Use materials and/or energy from the environment to help the product/system
accomplish its function” – and one of the biomimetic design guidelines from Wadia and
McAdams [62] – “Interact with and use environment versus isolation” – seem to get to
the heart of GDG #32 – “Interconnecting available flows of energy and materials within
the product or between the product and its environment” [61]. The examples Wadia [63]
provides for biomimetic design guideline discussed here include Eastgate Centre, the
lotus plant, and shark dentricles. This indicates that Eastgate Centre should likely meet
GDG #32, and that transparent thin films inspired by the lotus leaf and Sharklet may
likely meet this guideline as well, since their biological analogies likely meet GDG #32.
Here, Eastgate Centre and the self-cleaning transparent thin film were both found to meet
GDG #32 better than their comparison products, but Sharklet did not. This discrepancy
can be explained by the description Wadia provides explaining why shark dentricles meet
129
the biomimetic design guideline. He states: “The shark uses the water flowing along its
surface (along with its ribbed dentricles) to keep its skin clean” [63]. This trait does not
transfer to Sharklet because Sharklet does not use water, or any other medium in its
environment, to keep itself clean; instead, it prevents bacteria from forming colonies
through the use of physical barriers. Ultimately, Wadia’s [63] results prove consistent
with the findings presented in the GDG analysis above.
10.6 CONCLUSION
The data and analysis for the GDG study is presented above. Ultimately, the study
uncovered preliminary trends in a pool of nine sustainable BIDs. These designs were
found to frequently meet a number of efficiency-related GDGs, compared to a
functionally equivalent non-BID product. The results of this study were validated through
the use of two raters, along with partial validation from the results of related studies.
130
Chapter 11: Additional Keyword Trends
Chapter 11 presents a keyword study uncovering trends in the sustainable BIDs
discussed in Chapter 10. First, the methodology is presented, along with an in-depth
analysis of three keywords identified – passive mechanisms, multifunctional designs, and
optimized geometries. Each keyword is defined in the context of both biology and
engineering, examples are provided, and the keyword’s connection to a potential
reduction in environmental impact explained. Second, the classification of these three
keywords as true ‘trends’ in sustainable BIDs is validated by analyzing the 9 sustainable
designs discussed in Chapter 10 and by confirming these trends with other BID literature.
11.1 METHODOLOGY OF KEYWORD TRENDS STUDY
While conducting the study outlined in Chapter 9 and collecting the data
summarized in Chapter 10, keywords related to sustainability characteristics of the BIDs
repeatedly arose in the literature. These keywords were researched further to see if the
concepts they referenced point to a meaningful set of design characteristics desirable in
sustainable design and might be accurately applied to the other sustainable BIDs. Each
keyword trait was defined using a wide range of literature from biology and engineering,
with numerous examples of the keyword traits provided. Literature research was
conducted to confirm that the keyword traits are associated with likely sustainability
benefits, and that they are likely to be found in biology and BIDs. Using this information,
each of the 9 sustainable BIDs was analyzed for the keywords that repeatedly arose in the
study, to see if they could be regarded as possessing the trait of interest, even if no
sources in the literature directly described them as possessing those traits. Like in Chapter
10, this analysis was conducted by two independent researchers and the results compared.
The literature research and results of the analysis are provided below.
131
11.2 IDENTIFYING KEYWORDS
The keywords were identified in the literature on the 9 BIDs analyzed in Chapter
10. For instance, 4 out of 9 sustainable BIDs are described as “passive,” indicating that
passive mechanisms may be linked to sustainable BID. Five sources [292,293,295-297]
describe Biolytix as “passive”, along with four sources [29-32] for the cooling system in
Eastgate Centre, one source [266] for Sharklet, and one source [298] describing self-
correction boxfish.
Ultimately, three keywords were identified from the group of sustainable BIDs:
passive mechanisms, multifunctional designs, and optimized geometries. Each of these
terms was found in the literature on one or more of the designs and the related
sustainability characteristic was found to apply to many of the sustainable BIDs analyzed.
These three features will be discussed in detail throughout the remainder of the chapter.
11.3 PASSIVE MECHANISMS
Passive mechanisms are discussed throughout literature in biology and
engineering. Definitions and explanations of passive mechanisms from a wide range of
sources are provided below:
Okada et al. [299] distinguish active and passive compliance in the shoulder
mechanisms of humanoid robots, by explaining that “active compliance is
realized by actuators” whereas “passive compliance means mechanical
compliance of members.”
Wright et al. [300] examine the regulation of impact forces in heel-toe running
and state that “Active changes may consist of altered muscle stimulations of
initial conditions prior to heelstrike” whereas “Passive changes are a
mechanical reaction of the system to altered shoe hardness.”
132
In the context of the control of functional capillary density in red muscle,
Honig et al. [301] explain that active control would be performed “by vascular
smooth muscle,” while passive control is performed “by the rheological
properties of microvascular networks.”
Dietschy [302] states, in the context of a discussion of the mechanisms for the
intestinal absorption of bile acids, that “Net movement of a given substance
across a membrane by a passive mechanism can take place only in the
presence of a favorable electrochemical gradient.”
In the context of prosthetic hand design, Dechev et al. [303] define passive
adaptive grasp as not requiring “sensors or electronic processing” to perform
their required function.
Based on these definitions, it is clear that active mechanisms involve action to perform
the desired effect – mechanical actuators or the stimulation of muscle, for instance –
whereas passive mechanisms perform the desired function without the need for active
energy – for example, through mechanical compliance or the rheological properties of the
environment.
These definitions and explanations of passive mechanisms support the more
general definition of ‘passive mechanisms’ adopted here. Here, passive mechanisms are
defined as mechanisms that use ambient energy and perpetually-existing forces, such as
gravity, to perform functions. Their system inputs are either renewable, such as waste
heat and sunlight, or are not consumed during the operation of the mechanism, such as
gravity and magnetic properties. Other potential inputs to passive systems include
chemical attraction and repulsion, inertia, and the physics of fluid flow, for instance.
133
11.3.1 Examples of Passive Mechanisms
Passive mechanisms are found in numerous non-bioinspired engineering designs,
BIDs, and biological systems. A list of examples described as “passive” in academic
literature is provided in the table below with sources. These examples illustrate the
potentially wide scope of passive mechanisms within engineering, BID, and biology.
Table 11: Examples of passive mechanisms in non-BID engineered systems, BIDs, and
biological systems.
Engineered Systems
(not Bioinspired)
BIDs Biological Systems
1. Use of v-shaped wall
protrusions to reduce
turbulence in channel flow
[304]
2. Passive tuned mass dampers
to reduce vibrations in
buildings [305]
3. “[P]assive elastomeric engine
mounts… for isolating an
airframe from an engine”
[306]
4. Multicomponent phase
change materials used for
“passive solar heating” [307]
5. “Passive ventilation and
heating in a multi-storey
structure, by natural
convection” [308]
6. “Passive solar water-heating”
systems [309]
7. Passive solar lighting systems
for residential or commercial
structures using optical fibers
[310]
8. “[C]ircuts that provide
lossless passive soft
switching” [310]
1. Passive cooling in Eastgate
Centre [29-32]
2. “[P]assive transport of solids
by waste water” [295 ]; “on-
site passive treatment” of
waste water [297 ]; “passive
discharge of raw effluent”
[292 ]; and “Passive
ventilation” [296 ] in
Biolytix
3. Sharklet’s “passive and
nontoxic surface” [266 ]
4. Bipedal robots with passive
walking mechanisms
[311,312]
5. Micro-air vehicles with
passive joints inspired by
seagulls [313]
6. Passive systems to collect
and distribute water inspired
by thorny devils [314]
7. Passive compliance in the
shoulder mechanisms of
humanoid robots [299]
8. Passive adaptive grasp in
prosthetic hand design [303]
1. “Passive self-correction of a
body position in the boxfish”
[298]
2. Muscle actuation in animals
can be performed using
passive mechanisms in the
hinges between joints [68]
3. Passive soft tissue is present
in the subtalar and talo-
crural joints in humans [300]
4. Passive mechanisms in the
wings of fruit flies allow
elastic energy storage [315]
5. Stretching soft tissues in
humans’ hips creates passive
moments [316]
6. Passive mechanisms
contribute to functional
capillary density [301]
7. “[P]assive mechanisms drive
secretory granule
biogenesis” in the parasite
Giardia lamblia” [317]
8. Passive mechanisms cause
“ionic diffusion of bile
acid… across the small
intestine” [302]
9. The buildup of calcium salts
in human arteries can occur
passively [318]
10. “Passive mechanical forces”
are involved in caterpillar
motion [319]
134
11.3.2 Potential Environmental Benefits of Passive Mechanisms
Passive mechanisms use freely-available, clean, renewable energy. They
consequently are connected to a reduction in the consumption of active energy sources,
such as fossil fuels. In some sense, passive mechanisms can also be connected to energy
efficiency. While the technical energy efficiency of a passive mechanism may be low,
because they may use a significant amount of ambient energy, passive mechanisms can
still be considered ‘efficient’ from an environmental standpoint because they require
fewer active energy inputs to achieve the same outputs as competing products.
Many sources discuss the connection between passive mechanisms and energy
efficiency, making it clear that this interpretation of energy efficiency is not at odds with
the rest of the field. Three sources discuss passive mechanisms that allow energy storage
in the wings of fruit flies [315], in compliant members in humanoid robots [299], and in
the hips and ankles of humans [316]. This energy storage capability leads to significant
increases in energy efficiency, accounting for 10% of the inertial power in the wings of
fruit flies [315] and 35% of the net hip moment in humans [316], for instance.
Additionally, passive mechanisms in connectors for metamorphic robots have low or no
power consumption [320], and wall protrusions have been shown to reduce turbulence in
channel flow passively, resulting in as much as a 10% drag reduction compared to a
smooth surface [304].
Hence, designs containing a bioinspired passive mechanism are likely to
outperform competitors without a passive mechanism when compared using the
following GDGs: #1: “Specifying renewable and abundant resources”; #11: “Specifying
the cleanest source of energy”; and #32: “Interconnecting available flows of energy and
materials within the product or between the product and its environment” [61]. When a
reduction in energy inputs to achieve the same outputs is considered energy efficiency, as
135
explained above, GDG #28: “Specifying the best-in-class energy efficiency components”
[61] should also be included in this list.
11.3.3 Passive Mechanisms Conclusion
Passive mechanisms perform functions with the use of clean, renewable, ambient
energy sources and can be found in a wide range of biological systems, BIDs, and non-
BID engineering designs. Passive mechanisms are associated with a number of
environmental benefits related to using renewable, abundant, and clean energy; they are
often also associated with increased energy efficiency because they require the use of
fewer active energy inputs.
11.4 MULTIFUNCTIONAL DESIGNS
Multifunctional components perform numerous functions. For instance,
“[m]ultifunctional materials are integrated systems that serve multiple roles such as
structural load bearing, thermal management” and energy absorption [321]. Component
integration is one way to design multifunctional parts. Component integration is a
“design-for-manufacturing (DFM) strategy” that minimizes the total number of parts,
frequently producing complex parts [322].
Multifunctional designs are a type of integral product architecture, where “a
single chunk implements many functional elements” [322]. Many sources [323-326]
emphasize the connection between multifunctionality and integral product architectures,
stating that products with integral architectures have many functions performed by one or
a few physical parts. In contrast to integral and multifunctional designs, modular
architectures have a one-to-one correspondence between functions performed and
physical elements [322,324,326,327].
136
11.4.1 Examples of Multifunctional Designs
Many non-BID engineering designs, BIDs, and biological systems are described
in academic literature as “multifunctional.” A number of examples are provided in the
table below. Designs described as “integrated” or “integral” that appeared to
multifunctional were also included. These examples show the broad scope that
multifunctional designs have.
Table 12: Examples of multifunctional designs in non-BID engineered systems, BIDs,
and biological systems.
Engineered Systems
(not Bioinspired)
BIDs Biological Systems
1. The physical structure for the
transmission of the BMW
R1100RS motorcycle
provides both structural
support and power
conversion [322]
2. Integrated into “the throttle-
body end of [a] redesigned
intake manifold” “are the
attachments for the EGR
return and the vacuum source
block. These attachments use
a molded ‘push in and turn’
geometry, eliminating the
need for several threaded
fasteners” [322]
3. Stone et al. [324] name
wrenches and screwdrivers as
examples of integral
products, stating that “[a]ll
functions are embodied by
one physical element.”
4. A drawer with an indentation
to accommodate a hand is an
example of an integrated
design because it eliminates
the need for a separate handle
and fasteners [325]
1. Liu and Jiang [328]
provide a list of 13
bioinspired
multifunctional materials
with sources and a list of
their multifunctional
properties, including
fabrics, glass, glass slide,
nickel, PAH-
SPEEK/PAA, PDMS,
PUA, Si wafer, silica,
silicon, UPy, and ZnO.
2. “The Eastgate Complex
integrates the internal
and external
environments reducing
the chances of system
failure” [63]
1. Liu and Jiang [328] provide a list
of 17 multifunctional materials
in biological organisms: butterfly
wings, brittlestars, cicada wings,
fish scales, gecko feet, lotus
leaves, mosquito compound
eyes, nacre, peacock feathers,
polar bear fur, rice leaves, rose
petal, shark skin, spicule, spider
capture silk, spider dragline silk,
and water strider legs.
2. “A striking particularity of nastic
structures is an efficient and
inconspicuous design that
integrates two or more
functions… into one smoothly
operating unit” [329 ]
3. The “natural fibrous composite
material” in the “cuticle of
arthropods” is “multifunctional”
[11 ]
4. The shark’s dermal denticles are
multifunctional because they
both reduce drag and keep the
skin clean” [31]
5. Pandremenos et al. [330] discuss
a number of integrated and
multifunctional designs
including the “highly integrated
modules” in “the metabolic
network of various organisms”
and honeycomb.
137
11.4.2 Potential Environmental Benefits of Multifunctional Designs
Because they are a subset of integral designs, multifunctional designs share the
same environmental benefits.
Integral designs are linked to materials efficiency for a number of reasons. First,
they frequently eliminate redundant parts; for example, a redesigned intake manifold
“eliminat[ed] the need for several fasteners” through the integration of “the attachments
for the EGR return and the vacuum source block” [322]. Additionally, the function-
sharing in integral designs reduces materials usage, and “the geometric nesting of
components” minimizes the volume [322], which is why other authors describe integral
products as “lightweight” and “compact” [330]. For example, the integral architecture of
the BMW R1100RS motorcycle, a non-BID engineered product, helped reduce the mass
and volume of the design [322].
Integral designs are loosely connected to energy efficiency as well. The material
efficiency of integral designs, discussed above, translates to a reduction in the mass, and
a reduction in energy required during transportation and operation. Additionally, products
with integral architectures are linked to a higher degree of optimization than modular
products [322,331], particularly with respect to performance characteristics, such as
“acceleration, energy consumption, aerodynamic drag” and noise that are “driven by the
size, shape, and mass of a product” [322].
As a result of their environmental benefits, multifunctional and integral designs
are likely to meet the following GDGs better than a modular comparison product: #16,
#17, #18, #21, #27, #28, #40, #52, and #59. GDGs #21: “Minimizing the number of
components”; #52: “Minimizing the # and variety of joining elements”; and #59:
“Condensing into a minimal # of parts” [61] are all related to reducing the number of
redundant parts. GDGs #16: “Employing folding, nesting or disassembly to distribute
138
products in a compact state”; #17: “Applying structural techniques and materials to
minimize the total volume of material”; #18: “Specifying lightweight materials and
components”; and #27: “Minimizing the volume and weight of parts and materials to
which energy is transferred” [61] are all associated with minimizing the volume and mass
of parts. Additionally, GDG #28: “Specifying best-in-class energy efficiency
components” [61] is associated with increased optimization for acceleration, energy
consumption, drag, and noise.
11.4.3 Potential Environmental Benefits of Modular Designs
However, modular product architectures are also associated with environmental
impact advantages, primarily during a product’s end-of-life. These advantages include
enhanced ability to be maintained [332,333], reconfigured [334], upgraded [332-334],
reused [332-335], remanufactured [335], recycled [332-335], and have problems
diagnosed and repaired [332]. For example, “the fact that the alternator is a separate
module that can be removed fairly easily (as opposed to being an integral part of the
engine block) aids in both service and in product retirement” [327].
Hence, modular designs are likely to meet the following GDGs better than a
multifunctional or integral comparison product: #38, #39, #55, #57, and #58. GDG #38:
“Reutilizing high-embedded energy components” [61] is related to the increased
reusability of different modules. GDG #39: “Planning for on-going efficiency
improvements” [61] is related to increased upgradability. GDG #55: “Ensuring that
incompatible materials are easily separated” [61] is related to increased recyclability.
GDGs #57: “Organizing in hierarchical modules by aesthetic, repair, and end-of-life
protocol” involves how a product is grouped in modules, and #58: “Implementing
139
reusable/swappable platforms, modules, and components” [61] is directly related to the
existence of modules.
11.4.4 Multifunctional Design Conclusion
Multifunctional designs perform functions with fewer overall components and
less material than modular designs. They can be found in a wide range of biological
systems, BIDs, and non-BID engineering designs. There are many environmental
tradeoffs between modular and integral/multifunctional designs, and the decision of
which type of design to use depends on the specifics of the type of product and its
intended application. Integral, and hence multifunctional, designs are associated with
materials efficiency because they eliminate redundant parts, minimize the mass of parts,
and minimize the volume of parts through nesting. They are also associated with energy
efficiency because of their reduced mass and the fact that they are more likely to be
optimized for energy-related parameters. In contrast, modular designs are associated with
environmental benefits in end-of-life; they can be more easily maintained, repaired,
reused, and recycled, for instance.
11.5 OPTIMIZED GEOMETRIES
‘Optimized geometries’ are shapes that are particularly desirable, for example,
because they are aerodynamic, resistant to deformation, prevent organisms from growing
on their surface, or encourage desirable fluid flow for heat transfer or acoustics. There is
some theoretical support indicating optimized geometries are likely to successfully
transfer their benefits to engineering designs because geometry is a surface-level
attribute, making it easier to replicate in engineering [80].
140
11.5.1 Examples of Optimized Geometries
Many non-bioinspired engineering designs, BIDs, and biological organisms
reportedly have optimized geometries. A list of examples explicitly referenced in
academic literature is provided in the table below. These examples illustrate the scope of
optimized geometries within engineering, BID, and biology.
Table 13: Examples of optimized geometries in non-BID engineered systems, BIDs, and
biological systems.
Engineered Systems
(not Bioinspired)
BIDs Biological Systems
1. “Fiber-optic SERS sensor
with optimized geometry”
[336]
2. “A two-dimensional
lightweight cantilever
structure… comprising 40
rigidly joined beams, of
which the geometry is
optimized to reduce
vibration transmission over
a given bandwidth” [337]
3. Optimizing the geometry of
the chamber in
microchannel reactors
promotes flow uniformity
[338]
4. Optimizing blade
geometries for transonic
compressors using CFD
[339]
5. Optimized gas nozzle
geometries [340]
6. Topology optimization for
scaffolds in bone tissue
engineering [341]
7. Optimized geometries for
vascular stents [342]
1. The surface of some earth-moving
machinery (ploughs) was inspired
by the geometrically optimized
ridges on soil-moving animals [11]
2. Optimized geometries are in the
bionic concept car, and the
Shinkansen’s nose cone and
pantograph [63].
3. In an organ on a chip, “[t]he
geometry of [the]engineered tissue
interface was optimized to
approximate the blood flow rate of
the liver and to align rat
hepatocytes… as they do along the
endothelium-lined sinusoidal barrier
in vivo” [343]
4. “[M]oth-eye anti-reflection
coatings” where “[t]he geometry of
closely packed arrays of nanoripples
was optimized for operation” in
solar cells [344]
5. Using the performance of Ensis
directus, the Atlantic razor clam,
“and the animal’s geometry” Winter
et al. [345] “calculated that an
Ensis-based burrowing/anchoring
system would provide a 10X
improvement.”
6. “[O]ptimum bio-inspired attachment
structures” based on the
“[s]tructure, size, and shape of
contact elements” in “insects,
spiders, and geckos” are being
developed [346].
1. “One of the most
intriguing shapes is the
branching structure of
the “adhesive” hairs on
the foot of the gecko.
They are far finer than
anything generated by
etching processes, being
of nanometric
dimension at the
tipmost branches” [294]
2. “The optimally located
holes in the insect
cuticle deform under
external stimuli” [63]
3. “The microscopic ribs
of the shark’s scales
suppress turbulence in
the boundary-layer
flow,” reducing energy
loss caused by drag [68]
4. “Adaptive geometry of
burrow spacing in two
pocket gopher
populations” [347]
5. Andersen [348]
discusses the adaptive
geometry of geomyid
burrows in the context
of different
environmental
constraints related to
energetics.
141
11.5.2 Potential Environmental Benefits of Optimized Geometries
Ultimately, whether an optimized geometry confers a sustainability-related
benefit depends on the sense in which the geometry is optimal. If a profile on a BID is
optimized to more easily get the attention of consumers, for instance, this would not be
expected to confer a sustainability-related advantage.
In some cases, however, optimized geometries are likely to cause a system to be
more energy efficient. For instance, “The microscopic ribs of the shark’s scales suppress
turbulence in the boundary-layer flow,” reducing energy loss caused by drag [68].
Frequently, when bioinspired optimized geometries are incorporated into products, only
minor changes to the existing geometrical profile of products are required. Unless these
slight changes in geometry require different manufacturing process or materials to be
used, it seems that incorporating optimized geometries would likely have a very small
impact in other stages of the life cycle. Consequently, it is likely that incorporating an
optimized geometry would lead to a more sustainable product overall.
In addition, the models of biological systems used by engineers in BID may
frequently be more ‘optimized’ and ‘efficient’ than the biological organism they are
modeling. Weber et al. [224] observed that models of biological systems are frequently
idealized, and when they compared the performance of real and idealized versions of
cetacean flippers in water tunnel testing, they found that “[d]rag performance was
significantly improved by idealization.” Hence, if a final design is more likely to be
efficient when it has been inspired by an efficient analogy, engineers conducting BID
may see this advantage simply by modeling and idealizing the biological system.
Because of the wide range of ways geometries could be optimized, and the
consequent range of environmental impact advantages they could have, optimized
geometries are not analyzed here in terms of the GDGs they are likely to affect.
142
11.5.3 Optimized Geometries Conclusion
Optimized geometries perform a wide range of functions as a result of their
desirable shape. In some cases, optimized geometries are likely to cause a system to be
more energy efficient. Minor changes in shape to optimize geometries found in products
would likely have a very small environmental impact in other stages of the life cycle.
Hence, incorporating an optimized geometry into a design would likely lead to a more
sustainable product overall.
11.6 VALIDATION OF KEYWORD TRENDS BY ANALYZING 9 SUSTAINABLE BIDS
Two researchers analyzed the nine sustainable BIDs using the same procedure
discussed in Chapter 10 to see which contained bioinspired passive mechanisms,
multifunctional designs, and optimized geometries, and experienced an environmental
impact advantage over their competitors as a result of these bioinspired features. A
summary of these results is show in the table below. An explanation of why each design
was found to have these traits is provided in Appendix H.
Table 14: Keyword trends found in sustainable BIDS.
Bioinspired Designs Analyzed
Passive
Mechanisms
Multifunctional
Designs
Optimized
Geometries
Biolytix Filter X
Daimler-Chrysler Bionic Car - Shape X
Daimler-Chrysler Bionic Car -
Structure
Eastgate Centre Cooling System X X
Interface FLOR i2 Entropy Carpet
Self-Cleaning Transparent Thin Film X X
Sharklet Antimicrobial Surface X
Shinkansen 500 Series Nose Cone X
Shinkansen 500 Series Pantograph X
As is shown in the table above, 3 of the 9 BIDs were found to have bioinspired
passive mechanisms that conferred an environmental impact advantage. To be considered
143
as such, the biological analogy needed to have a passive feature that was then transferred
to engineering and remained passive in the BID. Additionally, they needed to have a
feasible ‘active’ alternative design in engineering. All 3 BIDs with bioinspired passive
mechanisms met many of the GDGs connected to passive mechanisms better than the
competing product; all three met GDGs #1 and #32, and two of the three met GDG #11.
Two of the 9 sustainable BIDs were identified as being more multifunctional than
competing products as a result of their bioinspired features. BIDs were classified as
‘multifunctional’ only if the BID integrated two components that were separate in the
competing product, but were integrated in the biological analogy. Additionally, the
component integration needed to be the cause of the reduced environmental impact. Of
the ten GDGs theoretically associated with integral and multifunctional designs, GDGs
#17, #18, #27, #28, #40 are hit by the 9 BIDs analyzed in the study. The two BIDs
determined to be multifunctional designs hit at least one of these guidelines. With the
exception of Inteface FLOR, which met guideline #58, none of the other BIDs met any of
the GDGs associated with modularity.
Four out of ten of the designs analyzed in the study had optimized geometries that
were transferred from the biological analogy to the engineered design and conferred a
sustainability advantage.
11.6.1 How This Analysis Validates the Three Keyword Trends
This analysis is fundamentally different than the methodology that drove the
discovery of the keywords. Rather than looking in the BID literature for quotations
related to these terms for each of the designs, the designs were analyzed using the
information from the library entries and the definitions of the keywords, provided above,
to see whether or not the designs had each of the potential keyword trends. In many
144
cases, this meant that designs with no reference in the literature to the keywords were
determined to have one of the keyword trends; for instance, no quotations were found
describing the self-cleaning transparent thin film as passive, but it was still found to have
a passive mechanism in the analysis. In other cases, designs with a reference in the
literature to one of the keywords were ultimately found to not have the related keyword
trend; for instance, self-correction boxfish was described as passive in the literature
[298], but the shape of the Daimler-Chrysler concept car was not found to have a passive
mechanism. Hence, this analysis is different from the methodology that originally
developed the list of keyword and can be used to confirm that passive mechanisms,
multifunctional designs, and optimized geometries are trends in sustainable BID.
However, since the keywords were frequently found in the literature on these designs it is
more likely that this particular sample of sustainable BIDs would possess these features,
meaning further support is necessary.
11.7 VALIDATION OF TRENDS USING BID LITERATURE
Other sources in BID literature focused on finding design principles in biology or
biomimetic design principles further confirm that the three keywords identified represent
true trends in sustainable BIDs. In particular, a 2010 conference paper from Wadia and
McAdams on biomimetic guidelines [62], a 2011 thesis from Wadia on biomimetic
design principles [63], a 2009 figure from the Biomimicry Guild on life’s principles [64],
and a 2011 figure from the Biomimicry Group, also on life’s principles [65], are heavily
used. More information on these sources can be found in Chapter 2.
11.7.1 Passive Mechanisms
Three of the sources mentioned above present principles related to passive
mechanisms. Both the Biomimicry Guild and the Biomimicry Group documents deal
145
with the design principles of biology and have the analogous principles: “free energy”
[64] and “use readily available materials and energy” [65], respectively. The Biomimicry
Group also describes the “Operating Conditions” in biology as including “sunlight, water,
and gravity” [65]. These two sources imply that many passive mechanisms in biology
should exist, at least at the initial places on the food chain where this free, readily
available energy from the sun is harnessed. In addition, work confirms that BID can be
used to design products with passive mechanisms. One of Wadia’s [63] biomimetic
design principles – “Use materials and/or energy from the environment to help the
product/system accomplish its function” – is of a similar nature, but is related directly to
BIDs.
Hence, the results presented above from the keyword trends study regarding
passive mechanisms are consistent with, and validated by, the work from Wadia [63],
who used a different methodology on a pool of standard BIDs to arrive at the same trend;
this work is also consistent with efforts from the Biomimicry Guild and Biomimicry
Group, whose methodology is far less transparent, but is likely to be substantially
different from the methodology presented here.
11.7.2 Multifunctional Designs
Many sources confirm the presence of multifunctional designs in biology. The
Biomimicry Group [65] includes three principles related to multifunctional design: (1)
“integrate the unexpected”; (2) “use multi-functional design” under the category “be
resource (material and energy) efficient”; and (3) “combine modular and nested
components” under the category “integrate development with growth.” Similarly, the
Biomimicry Guild [64] lists “multi-functional design” as one of ‘Life’s Principles.’
Additionally, Pandremenos et al. [330] study a number of examples of both modular and
146
integral design architectures in biology, finding that integral architecture is common in
“cases where… strong relations among the different parts are required” “for the
biological systems to function properly.” Both Pandremenos et al. [330] and Liu and
Jiang [328] claim that biological materials are multifunctional. Helms et al. state:
“Biological designs typically result in more multi-functional and interdependent designs
than engineering designs” [144].
Additionally, work from Wadia [63] and Wadia and McAdams [62] confirm that
BID can be used to create multifunctional designs in their similar biomimetic design
principle and biomimetic design guideline – “Make a single part from two or more parts
with distinctive material properties and functionalities” and “incorporate multi-
functionality,” respectively. Wadia and McAdams [62] observed this biomimetic design
guideline in 40% of the 20 BIDs they analyzed.
11.7.3 Optimized Geometries
Both the Biomimicry Group [65] and Biomimicry Guild [64] confirm the
presence of optimized geometries in biology, through the principle: “fit form to
function,” which is under the category “be resource (material and energy) efficient” in the
Biomimicry Group’s version. Additionally, both Wadia and McAdams [62] and Wadia
[63] confirm the ability of BID to generate optimized geometries. Wadia and McAdams
[62] observed instances of “Fit form to function” in 50% of the BIDs they analyzed, and
Wadia’s [63] biomimetic design principles include - “Form: Adapt and optimize the
form/shape/size of the product to meet specific functional needs.” All of this work serves
to validate the idea that ‘optimized geometries’ are a true trend in BIDs.
147
11.8 CONCLUSION
Three keywords were identified from the literature on the 9 BIDs analyzed in
Chapter 10 – passive mechanisms, multifunctional designs, and optimized geometries.
Each of these concepts was defined, and numerous examples of these types of designs in
non-BID engineering, BID, and biology were provided. The relation between each design
type and potential environmental impact reductions were discussed. In particular, all
three design types are associated with either energy or materials efficiency.
To determine whether these keyword design types represent true trends in
sustainable BIDs, the pool of 9 BIDs was then analyzed to see whether they actually
contained bioinspired features of these types, and to see whether these features were
associated with environmental benefits. Of 9 designs analyzed, 3 had passive
mechanisms, 2 were multifunctional, and 4 had optimized geometries. Because the
methodology used to determine the keywords is different from that used to determine
whether these design types are truly present in the BIDs, this analysis partially confirms
that these three design types represent trends in sustainable BIDs. Additionally, work
from the BID community enumerating biology’s design principles and general
biomimetic design principles further confirm the results presented here. Hence, there is
evidence that passive mechanisms, multifunctional designs, and optimized geometries are
true trends in sustainable BIDs.
148
Chapter 12: Section 2 Conclusion
Chapter 12 concludes Section 2, which identified and analyzed trends related to
environmental impact reduction in existing sustainable BIDs. A summary of Section 2 is
provided, followed by a brief discussion of the challenges encountered when conducting
the studies. This chapter concludes with a discussion of opportunities for future work,
including the types of analysis that could be done if more sustainable BIDs were analyzed
and the potential design tools and methodologies that could be developed.
12.1 SUMMARY OF SECTION 2
Chapter 9 presented a methodology for developing a comprehensive list of BIDs,
determining which designs have an environmental impact advantage as a result of their
bioinspired features, and identifying sustainability-related trends in these designs using
GDGs. Extensive information from academic sources was compiled in ‘design library’
entries in Appendices A-C for 15 designs, 9 of which were shown to have sufficient
information and a true environmental impact advantage.
Chapter 10 discussed the results of the GDG analysis for the 9 designs, showing
the types of trends that may arise in the population of sustainable BIDs. A summary of
the GDGs most frequently met better by the sustainable BIDs than competing products is
provided in the table below. Two of the four GDGs – #1 and #9 – are related to materials
selection, using renewable and abundant materials and using clean materials,
respectively; the other two GDGs – # 28 and #32 – are related to efficiency advantages.
149
Table 15: Summary of the GDGs most frequently met better by the 9 sustainable BIDs.
Frequency GDG (from Telenko [61])
3 GDG #1: Specifying renewable and abundant resources
3 GDG #9: Specifying non-hazardous and otherwise environmentally
"clean" substances, especially in regards to user health
7 GDG #28:Specifying best-in-class energy efficiency components
3 GDG #32: Interconnecting available flows of energy and materials
within the product or between the product and its environment
In Chapter 11, passive mechanisms, multifunctional designs, and optimized
geometries were identified as recurring keywords in the pool of 9 sustainable BIDs
related to environmental impact. These keywords were defined, and their connection to
reduced environmental impact – particularly energy and materials efficiency – was
explained. Finally, these keywords were validated and shown to truly represent trends in
sustainable BIDs. A summary of the results from the keyword trends analysis using the 9
sustainable BIDs is provided in the table below.
Table 16: Summary of the keyword trends found in the 9 sustainable BIDs.
Frequency Keyword Trend
3 Passive Mechanisms
2 Multifunctional Designs
4 Optimized Geometries
The results of Section 2 indicate that sustainability-related characteristics from
biology are able to be transferred to engineering, and are currently being transferred via
BID. Hence, it is possible to develop tools and methodologies directed toward using BID
for sustainable engineering design. For all sustainability-related traits, there may be
tradeoffs in other life cycle stages which should be considered before incorporating them
into a product.
150
12.2 CHALLENGES ENCOUNTERED
The process of compiling the information necessary for each of the 9 designs
from academic sources was challenging. Limited reliable information was available for
each BID; numerous sources were needed for each design to verify, qualify, and add to
the information found in the initial source from the breadth and depth searches. It was
especially difficult because implemented bioinspired products with a plausible
sustainability advantage are rare. Frequently, a reference to a BID found in the depth and
breadth searches was a reference to an idea for a BID, not a reference to an actual product
or constructed system; many sources offer one-sentence ideas for BIDs, without any
discussion of what it would take to manufacture, build, use, and dispose of this system.
Additionally, few designs had evidence of a sustainability advantage, fewer still had
evidence of a sustainability advantage as a result of their bioinspired feature, and almost
none had evidence of a sustainability advantage as a result of their bioinspired feature in
peer-reviewed academic literature. It is for these reasons that few designs were analyzed.
12.3 FUTURE WORK
Many avenues exist for future work related to the studies presented in Section 2,
including analyzing more sustainable BIDs, developing sustainable BID tools and
methodologies, and identifying potential advantages of BID over alternative design-by-
analogy techniques.
12.3.1 Analyzing More Sustainable BIDs
Both studies presented in Section 2 would be greatly enhanced by analyzing more
sustainable BIDs. First, the keyword trends study would benefit because additional
keywords related to sustainability-characteristics could be identified, and the existing
keyword trends – passive mechanisms, integral and multifunctional designs, and
151
optimized geometries – could be more thoroughly verified in the population of
sustainable BIDs.
Second, including more BIDs in the GDG analysis would clarify the trends and
would allow for a more sophisticated analysis. A larger pool of sustainable BIDs would
confirm or refute the tendency towards efficiency-related GDGs observed in the 9
sustainable BIDs. Additionally, BIDs could be divided into categories based on field
(architecture, chemical engineering), type of bioinspired feature (surface topology,
behavior, energy conversion process), the presence of particular bioinspired traits
(passive mechanisms, optimized geometries), the scale of the analogy (macro scale vs.
nano scale), the product life cycle phase where the bioinspired sustainability benefit
exists (use, end-of-life), etc. to identify more sophisticated and accurate trends.
Additionally, analyzing more designs would allow researchers to examine
whether some GDGs cannot be met through BID, or are not being met through BID. For
instance, a number of GDGs concern the designer or user, such as GDG #43: “Indicating
on the product which parts are to be cleaned/maintained in a specific way” [61]. As
biology does not have a conscious user who needs instructions, sustainability solutions to
better meet this guideline are unlikely to be uncovered through BID. Likewise, easy
disassembly is typically not a valuable characteristic for organisms, as organisms
typically benefit from having all body parts attached and intact, making it unlikely that
sustainability solutions for GDGs like #62: “Specifying all joints so that they are
separable by hand or only a few, simple tools” [61] would be found using BID. Hence, a
greater number of analyzed sustainable BIDs would allow researchers to better
understand the GDGs that are and are not likely to be met using BID.
152
12.3.2 Developing Tools and Methodologies for Sustainable BID
The results of both studies in Section 2 could also serve as a foundation for
developing design tools and methodologies related to sustainable BID.
For instance, the summary of the GDG Analysis results, in Appendix G, could be
used by engineers to find examples of products that are able to meet particular GDGs. For
instance, if an engineer wanted to reduce energy consumption to better meet GDG #1, he
or she could research the BIDs that met this guideline – the Biolytix BioWater filter,
Eastgate Centre, and the self-cleaning surface inspired by the lotus leaf, as shown in the
figure below – and use these designs and their biological analogies as analogies.
Figure 21: Depiction of a potential design tool that could be used to find examples of
sustainable BIDs that meet a particular GDG. Photo credit: [35,44,349].
Additionally, a number of potential design tools and methodologies could
originate from the keyword trends study. First, a checklist for designers could be created
that explains and provides examples of each keyword trend. Somewhat like the GDGs,
153
this checklist would make designers aware of potential sustainability-related traits they
could incorporate in their designs, such as passive mechanisms. Second, methodologies
could be developed to help engineers generate designs with the keyword traits. For
example, methodologies could be developed to assist in part integration and the
development of multifunctional designs.
12.3.3 Identifying Potential Benefits of BID over Other Design-by-Analogy
Techniques
Finally, researchers could determine whether BID is more likely to generate
designs with a specific keyword trait than other design-by-analogy techniques, by
comparing the frequency of these traits in biology and in the population of alternate
analogies. Assume, for instance, that a designer wants to consider concepts with passive
mechanisms, and that 40% of all biological organisms contain a passive mechanism
while only 5% of all engineered designs do. It would then be advantageous to use
biological organisms rather than patents as analogies, due to the increased likelihood of
finding passive mechanisms in the pool of potential analogies. By comparing the rates of
these sustainability-related traits in different pools of potential analogies, sustainability-
related advantages of different analogy types can be uncovered.
12.4 CONCLUSION
Three main topics were discussed in Chapter 12. First, the results of Section 2
were summarized, establishing that biological analogies are being used by designers to
make more sustainable engineering products and that many of these bioinspired
environmental benefits are related to efficiency. Second, the challenges encountered
while identifying and collecting information on the sustainable BIDs were discussed,
particularly the difficulty in identifying sustainable bioinspired features and the time
154
associated with collecting all necessary information from reputable sources. Finally, a
number of avenues for future work were presented, including analyzing more sustainable
BIDs to allow for increased robustness of the results, developing tools and methodologies
for sustainable BID, and identifying potential benefits of BID over other design-by-
analogy techniques by examining the rates of sustainability traits in different pools of
potential analogies.
155
Chapter 13: Thesis Conclusion
Chapter 13 concludes the thesis and is broken into three sections. First, a brief
summary of the thesis is presentede, followed by a summary of the thesis contributions.
Finally, future work related to the research presented in both Sections 1 and 2 together is
provided.
13.1 SUMMARY OF THESIS
Chapters 1 and 2 serve as an introduction to the thesis. Chapter 1 introduces the
topic and explains the organization of the thesis, while Chapter 2 discusses the
fundamentals of understanding and measuring environmental impact, as well as previous
work related to design principles found in biology and BIDs.
Chapters 3-8 are grouped into Section 1, which examines the claimed benefits of
BID using literature from biology and engineering design. Chapter 3 presents the
methodology of this study. Chapters 4, 5, 6, and 7 examine, respectively, claims related
to ideation, optimization in biology, sustainability in biology, and features of the BIDs
themselves. Chapter 8 concludes the section, discussing claims that were not selected for
analysis, issues that arose regarding what constitutes a biological analogy, and future
work.
Chapters 9-12 are grouped into Section 2, which identifies trends in existing
sustainable BIDs. Chapter 9 presents the methodology for a study comparing sustainable
BIDs and their competitors using GDGs, and Chapter 10 discusses the results of the study
for 9 sustainable BIDs. Chapter 11 delves deeper into the information collected on the
BIDs, identifying sustainability-related trends using keywords that frequently arose in the
literature on the sustainable BIDs. Chapter 12 concludes Section 2, discussing the
difficulty in collecting sufficient information for the sustainable BIDs, the potential
156
benefits of analyzing more sustainable BIDs using the methodologies presented in the
section, potential design tools and methodologies that could be developed related to
sustainable BID, and ways in which an extension of the keyword trends study could help
identify potential benefits of BID over other design-by-analogy techniques.
13.2 DISCUSSION OF THESIS
The central theme of this thesis is two-fold. On one hand, it appears that many of
the claimed benefits of BID, including those related to sustainability in both biology and
engineering, are invalid. On the other hand, it appears that bioinspired features have and
do regularly confer sustainability-related benefits to designs and that there is significant
potential to use biological analogies in sustainable design.
Section 1 showed that there is still much work to be done concerning the
fundamental theory of BID, related to its unique capabilities and advantages over other
design methodologies, including other design-by-analogy techniques. There is substantial
confusion and disagreement related to the benefits of BID, and many of the oft-cited
reasons for conducting BID prove invalid in light of academic work from engineering
design and biology. Additionally, it is clear that the vast majority of accounts of these
benefits – provided in academic books, conference papers and journals – are not
sufficiently rigorous to avoid unintentionally misrepresenting fundamental tenants of
biology or engineering design. Whatever future theories of BID are developed must be
firmly grounded in an advanced understanding of both engineering design methodology
and biology.
Within the design theory and methodology research community, it is popular to
study and focus on the novelty-related benefits of BID in ideation. Consequently, these
benefits are well-documented, as was shown in Chapter 4, and most existing BID
157
methodologies are focused on promoting these benefits – choosing appropriately-
distanced biological analogies, maintaining relevance to the design problem, and
avoiding design fixation. Preliminary efforts in the BID community to conduct research
related to sustainable BID served to dispel the myth ‘All BIDs are sustainable,’ with the
possible unfortunate consequence of directing research efforts elsewhere.
However, there is potential to learn environmental impact reducing techniques
from biological organisms, as was shown theoretically in Chapter 6 and empirically in
Section 2. Section 2 provided examples of the types of sustainability advantages that can
be achieved using BID – both related to the GDGs they are likely to meet and the types of
bioinspired sustainability-related traits that are likely to cause their environmental impact
reductions. While the data used to arrive at the conclusions presented in Chapters 10 and
11 is limited, as only 9 sustainable BIDs were analyzed, these chapters show how
bioinspired sustainability-related features can be identified. These chapters also suggest
that many of the bioinspired sustainability-related advantages are likely to be related to
energy and materials efficiency, and that certain types of biological analogies are likely to
confer certain types of benefits, i.e. a modular biological design is more likely to aid
designers in meeting GDGs #38, #39, #55, #57, and #58 related to end-of-life advantages,
while an integral design is more likely to help designs meet GDGs #16, #17, #18, #21,
#27, #28, #40, #52, and #59 related to materials and energy efficiency.
Hence, it is hoped that this work will inspire renewed interest in the development
of sustainable BID methodologies. These methodologies will likely begin with a specific
environmental impact-related engineering problem: the redesign of a product to better
meet a specific GDG, or a more general environmental benefit, such as increased energy
efficiency in use. If the desired environmental benefit is related to the types of designs
likely to be present in biology, as would be identified through studies such as those
158
presented in Section 2, a BID methodology can then be selected. This BID methodology
will likely involve the identification of biological analogies relevant to the problem of
interest using existing methods – biological databases and experts. Based on the findings
from Section 1, not all biological organisms and systems are likely to have the same
environmental impact characteristics of interest. Hence, the pool of potential analogies
should be scoped further, to include only those with the type of environmental impact
advantage of interest, either using additional software, if possible, or through the use of
experts in biology who can determine whether certain organisms have been selected for
energy efficiency advantages, for instance. Once these analogies have been selected,
methodologies should guide designers to retain these desirable sustainability-related
features in the final design: checklists for verifying that the feature is retained in the
design, probably in conjunction with existing sustainable design tools, such as GDGs.
This transfer process may involve a closer level of mechanism imitation than is
traditionally recommended in BID aimed at producing novel designs, since design
fixation is less of a concern, and it is critical to maintain the sustainability-related benefits
of the feature being imitated in the final design.
13.3 FUTURE WORK
Numerous avenues for future work related to either the theoretical study,
presented in Section 1, or the empirical studies, presented in Section 2, were discussed in
Chapters 8 and 12, respectively. Here, one particular avenue for future work that
combines element from both sections – a theoretical study analyzing the GDGs in the
context of biology – is discussed.
Theoretically analyzing the GDGs in the context of biology would provide a
better understanding of scenarios in which there might be selection pressure in biology
159
for a trait related to each of the GDGs. Work from Chapter 6 analyzing the claims related
to specific GDGs, with explanations of when these claims do and do not hold true, could
be used as a starting point for this analysis. Table 17 below shows the relevant claims
analyzed in Chapter 6 and their analogues in the GDGs.
The results from this analysis could be used to clarify when and how biological
systems could help designers better meet each of the GDGs. For instance, GDGs #62
“Specifying all joints so that they are separable by hand or only a few, simple tools” [61]
is unlikely to frequently be related to sustainable design solutions from biology, but
solutions may be found in rare organisms that experience a fitness advantage by having
easily detachable body parts, such as lizards whose tails separate from their bodies to
increase survival in certain interactions with predators [350]. Hence, this analysis may
make GDGs that are seemingly unrelated to solutions in biology conceptually accessible
to engineers and allow a broader range of sustainability solutions to be found using BID.
Additionally, this theoretical analysis would more fully address the work begun in
Chapter 6 aimed at explaining the ways in which biology is and is not sustainable. One of
the limitations of the work in Section 1 was that only claims frequently made in the
literature on BID were available to be analyzed; no consideration was given to potential
sustainability-related benefits of biological systems that had not already been identified
by other BID authors. The GDGs, intended to capture all the ways in which products can
be made more sustainable throughout their life cycle, provide a much more complete
framework for understanding how biology is and is not sustainable.
160
Table 17: Claims analyzed in Chapter 6 with related GDGs.
Claim GDG (from Telenko [61])
Biological organisms
use renewable and
abundant inputs.
GDG #1: Specifying renewable and abundant resources
Biological materials
are nontoxic.
GDG #9: Specifying non-hazardous and otherwise environmentally
“clean” substances, especially in regards to user health
Biological organisms
employ sustainable
manufacturing
processes.
GDG #13:Specifying clean production processes for the product and in
selection of components
GDG #23:Specifying clean, high-efficiency production processes
Biological organisms
do not pollute.
GDG #8: Installing protection against release of pollutants and
hazardous substances
GDG #9: Specifying non-hazardous and otherwise environmentally
“clean” substances, especially in regards to user health
GDG #10:Ensuring that wastes are water-based or biodegradable
GDG #11:Specifying the cleanest source of energy
GDG #26:Implementing fail-safes against heat and material loss
Materials in biology
are recycled.
GDG #2: Specifying recyclable, or recycled materials, especially those
within the company or for which a market exists or needs to
be stimulated
GDG #4: Exploiting unique properties of recycled materials
Biology is resistant to
damage.
GDG #41:Ensuring minimal maintenance and minimizing failure
modes in the product and its components
GDG #42:Specifying better materials, surface treatments, or structural
arrangements to protect products from dirt, corrosion, and
wear
Biology is efficient. GDG #17:Applying structural techniques and materials to minimize the
total volume of material
GDG #18:Specifying lightweight materials and components
GDG #21:Minimizing the number of components
GDG #22:Specifying materials with low-intensity production and
agriculture
GDG #23:Specifying clean, high-efficiency production processes
GDG #25:Implementing reusable supplies or ensuring the maximum
usefulness of consumables
GDG #26:Implementing fail-safes against heat and material loss
GDG #27:Minimizing the volume and weight of parts and materials to
which energy is transferred
GDG #28:Specifying best-in-class energy efficiency components
GDG #31:Maximizing system efficiency for an entire range of real
world conditions
GDG #32:Interconnecting available flows of energy and materials
within the product or between the product and its
environment
161
One challenge associated with conducting this theoretical analysis is that the
researcher must have a deep and nuanced understanding of evolutionary biology, and
must be aware of a wide range of outlier biological organisms and systems. It would
likely be very difficult and time consuming for someone without a formal background in
biology to conduct such an assessment.
162
Appendix A: Design Library Entries for 9 BIDs That Met All Selection
Criteria and Were Analyzed Using GDGs
Information on 9 sustainable BIDs – Biolytix, Daimler-Chrysler Bionic car shape, Daimler-Chrysler Bionic
car structure, Eastgate Centre cooling system, Interface Flor Entropy Carpet, self-cleaning transparent thin
film, Sharklet antimicrobial surface, Shinkansen 500 series nose cone, and Shinkansen 500 series
pantograph – is presented in Appendix A. First, a summary of the basic information is provided, including
the competing product and the biological analogy. Second, a description of the biological analogy is
provided, followed by a description of the BID, quotations from authoritative sources verifying that the
selection criteria have been met, and a comparison of the environmental impact of the BID and its
competitor.
163
A.1 BIOLYTIX FILTER
Field
Civil Engineering
Biological Analogy
Natural decomposition of debris
on a river’s edge
Environmental Advantage
No chemicals, smaller filtration
system, fewer energy-consuming
parts, less maintenance
Company
Biolytix Competitor
Septic tank Life Cycle Phase
Manufacturing and Use
Biological Analogy Description
Organic matter decomposes naturally in wet environments, such as those found in riparian zones, “land
adjacent to a stream, river, lake, or wetland” [351]. Decomposition occurs more quickly in oxygen-rich
environments because the microbes that break down organic matter use oxygen for cellular respiration
[352]. As organic matter decomposes in these wet environments, the waste and pollutants are filtered by the
riparian zone [353].
Decomposition of plants in a riverbed [354,355].
Bioinspired Design Description
Biolytix is a filtration device for households that mimics the filtration and treatment of waste in riparian
zones. The Biolytix system filters and treats “raw domestic waste water and solid organic waste” [356],
including paper, cloth, sanitary pads, tampons, grass clippings, dust, hair, lint, feces, oil, grease, soap,
detergents, and household chemicals [293]. Biolytix converts this waste into “a valuable soil amendment”
[293]. As the waste travels down the filtration bed, it decomposes and forms humus. This humus “forms the
bulk of the [filtration] bed” and serves as an “active filtration matrix” that filters the wastewater [292].
As in riverbeds, oxygen is required for decomposition. Hence, it is important that the filtration system does
not clog, preventing oxygen to penetrate to the bottom of the filtration matrix. As in riverbed ecosystems,
clogging is prevented in the Biolytix filter through the action of a number of organisms [292], such as
164
“worms, composting beetles, compost flies and such… typical of a soil layer or decomposing manure”
[293]. These larger organisms “create pores throughout the filtration matrix” [292], allowing oxygen to
penetrate the column and encourage decomposition in what otherwise would be an anaerobic environment.
The larger organisms also “work synergistically with fungi, bacteria, protozoa, nematodes and other
microbes” to rapidly and completely decompose all of the solid organic waste deposited [293].
[357]
Selection Criteria Verification
#1: The design is truly bioinspired.
“The Biopod… is an ‘ecosystem in a tank’… After 2.1 billion years of Research and
Development, nature has got it right. All around us, the natural world is treating its waste…
without electricity, without large aerators and without creating septic sludge as a waste
product... Biolytix incorporated nature’s time-tested strategies into its patented BioPod… the
BioPod uses the intelligence of nature to bring you many benefits” [358].
“For about a century, engineers have used water-based processes to treat wastewater. By
studying ecology, nature’s consummate engineer, Biolytix discovered that nature has a different
solution: in nature, the most effective treatment doesn’t happen in water, but in moist soil
ecosystems on rainforest floors and on river banks. This is where organisms convert waste into
cleaning humus. The humus then helps cleanse the wastewater. Using worms and other
organisms to break down organic waste is not an innovation – they have been doing so for
millions of years. Our innovation is using nature’s highly effective biological processes to solve
today’s challenge posed by wastewater” [359].
165
“A design principle to prevent bed buildup on its peripheral surfaces is to enable controlled
erosive surface flow to occur over the surface and sides of each bed element module, but to
provide sufficient protection to the surface of the bed at the intended long term surface level to
prevent erosion of the humus matrix below this level…. The structural support framework can
be made in such a way as to provide inherent stabilization of the surface at a defined level much
as tree roots provide protection from erosive flood flows to the soil on stream banks but allow
material above the root mat to be washed away. A porous net like plastic mesh can provide this
stabilization function” [292].
#2: The design is feasible.
According to the Biolytix Southern Africa’s website: “Biolytix is commercially available”
[360]. A number of other sources echo this statement and discuss Biolytix as an existing
system. However, it appears that Biolytix suffered significant financial losses as a result of a
warranty policy concerning flooding and went bankrupt. Regardless of whether Biolytix filters
currently are commercially available, it is clear that a commercial Biolytix filter once existed
and is therefore feasible.
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
“The Biolytix waste management system draws from the solutions of the natural world to solve
the problem of disposing of sewerage solids and liquids and meets several of the goals outlined
by the WBCSD [the World Business Council for Sustainable Development] concurrently,
thereby creating a more eco-friendly solution” [361].
“A Biolytix filter is the trademark name for an ecological wastewater treatment system that is
totally free of chemical inputs and that has no negative sludge of liquid effluent penetrating the
surrounding ecosystems” [362].
“Due to the efficient manner in which worm farm technology performs, it is not necessary to
add large aerating pumps or chemicals” to the Biolytix filtration system [361]. “This in turn
reduces… the negative costs to the environment” [361].
Biolytix filters are smaller than their competitors yet achieve the same amount of filtration. A
Biolytix patent states: “Filters according to the present invention have the advantage that their
sizes can be significantly less than is required for conventional filters, due to the biological
activity present and as a consequence of this specific biological activity the higher filtration
rates” [296]. A smaller size is frequently associated with lower lifecycle impact in materials,
manufacturing, and transportation.
Competitor Description
The Biolytix filter was compared to a conventional septic tank because septic tanks are the most commonly
used type of decentralized waste disposal system [363]. As can be seen in the diagrams, below, of two
different septic tank designs, septic tanks temporarily store sewage, allowing the sewage to separate based
on density. Solid waste sinks to the bottom, scum is captured on the surface, and liquid waste is removed.
Because the surface scum prevents oxygen from entering the waste [364], anaerobic conditions are present
[363], and anaerobic bacteria cause the solid waste to liquefy [364], making it possible to remove the waste
from the system. Periodically, the sludge needs to be removed. This “sludge is not biodegradable” [365].
166
Different types of septic tanks [366,367].
Comparison of Environmental Impact of BID and Competitor
The Biolytix filtration system is environmentally superior to a septic system for a number of reasons: (1)
Biolytix filters can be smaller than standard filters because of the additional filtration efficiency caused by
the river-inspired biological activity in the filter; (2) Biolytix filters do not require aerating pumps, meaning
less energy is consumed during use and fewer materials are required during production; (3) Biolytix filters
do not require added chemicals, and do not have toxic byproducts; and (4) Biolytix does not have any
byproducts such as sludge, and consequently requires less maintenance and has less of an impact during
use. Each of these items is explained in a corresponding numbered section below.
(1) Biolytix filters can be smaller than their competitors yet achieve the same amount of filtration. A
Biolytix patent claims that their filters can be significantly smaller than conventional filters
because of the higher filtration rates associated with the biological activity in the Biolytix filters
[296]. Consequently, Biolytix filters have a smaller environmental impact than septic systems
during manufacturing and transportation because less materials are required during the production
of the filters, and there is less volume and weight of materials to transport.
(2) Biolytix filter use living organisms – such as worms and insects – to aerate the waste so no
aerating pumps are needed. “Most traditional septic organic waste disposal systems use
technology that leaves the untreated matter in the wastewater. However, to maintain the ecosystem
necessary to break down the waste material several aerating pumps are needed. These pumps
aerate the waste creating bubbles thereby increasing the surface area of the waste material. This
larger physical environment allows a larger population of bacteria to break down waste material”
[361]. For a traditional septic system, “The need for aerating pumps to run continuously increases
the power consumption and complexity of the system” [361]. “Due to the efficient manner in
which worm farm technology performs” in the Biolytix system “it is not necessary to add large
aerating pumps… This in turn reduces… the negative costs to the environment” [361].
(3) Biolytix filters do not require the use of added chemicals to treat the waste, and do not create toxic
by-products. In typical household wastewater treatment systems, “chlorine based disinfection is
typically carried out on the liquid effluent, using hazardous chemicals and resulting in the
production of toxic disinfection by-products” [293]. Alternatively, disinfection could occur
thorough “a process whereby the liquid is exposed to high levels of artificially generated
167
ultraviolet radiation” [361]. However, in Biolytix filters, the “effluent moves slowly through the
bed in a matrix flow” causing the humus to be trapped and accrete in the bed and form “stable
aggregates through the action of living organisms in the biolytic filter ecosystem” [292]. “Due to
the efficient manner in which worm farm technology performs, it is not necessary to add …
chemicals” to the Biolytix filtration system [361]. Hence, “Unlike many conventional treatment
processes” the Biolytix filtration process “uses no chemicals” [360].
(4) “Unlike many conventional treatment processes” the Biolytix filtration “process… does not create
any by-products such as sludge” [360]. Instead, Biolytix’s “biologically activated filters require
little or no maintenance to keep them from blocking” [296]. In contrast, in conventional systems,
“Aqueous media such as sewage effluent, water for consumption, swimming pool water, industrial
effluent, aquaculture pond water… are commonly filtered with particulate filtering materials… to
remove suspended solids and biologically active material. Such filtering materials… are prone to
clogging due to microbial growth on the surface of the filter bed... Many sophisticated
arrangements have been devised to address this problem of clogging… Unfortunately such
methods generally involve high maintenance and have lower treatment performance” [296].
Consequently, many conventional septic waste disposal systems “need an additional ‘sludge’
removal operation to be performed every three to five years to remove the build up of unconsumed
waste. This in turn adds to the cost of running the system, as additional general maintenance is
required as well as the chemicals necessary to sterilize the wastewater” [361].
168
A.2 DAIMLER-CHRYSLER BIONIC CAR – SHAPE
Field
Mechanical Engineering
Biological Analogy
Aerodynamic exterior profile of the
spotted boxfish (Ostracion
meleagris)
Environmental Advantage
Stability and lower coefficient of
friction – reduced fuel consumption
Company
Daimler-Chrysler Competitor
Same car without bioinspired shape,
estimated using BMW 3 Series Sedan
Life Cycle Phase
Use
Biological Analogy Description
The spotted boxfish is a stable and efficient swimmer due to its shape. When a boxfish swims, “tiny
vortices form along the edges on the upper and lower parts of [its] body to stabilize the fish” [368],
allowing it to “maintain a smooth swimming trajectory and a stable position, even in a turbulent sea” [298].
The formation of vortices is controlled, in part, by the keeled carapaces on the boxfish, shown below, that
“produc[e] flows and pressure distributions that comprise an efficient, self-correcting system for pitch and
yaw” [39]. This increased stability caused by the formation of vortices is believed to result in energy
savings during swimming [39,40] because the fish does not have to actively right itself.
Anterior, posterior, and lateral views of the spotted boxfish. Scale bars are 1 cm [39].
Bioinspired Design Description
The shape of the body of the Daimler-Chrysler bionic concept car was inspired by the boxfish (Ostracion
meleagris) [11], and biologists were involved in its design [368]. The concept car was fully manufactured
and can be driven, although it was never produced on a large scale. Despite its boxy shape, the air drag
coefficient of the bionic car is 0.19, which indicates that the car is exceptionally aerodynamic [41]. For
comparison, the drag coefficient (cw) of the BMW 3 Series, the comparison vehicle, is 0.27 [369].
169
Shape evolution from boxfish to car [40].
Selection Criteria Verification
#1: The design is truly bioinspired.
According to Daimler’s website, the Mercedes-Benz bionic concept car is a “vehicle study with
the streamlined contours of a boxfish” [368].
“Applied to automotive engineering, the boxfish is… an ideal example of rigidity and
aerodynamics. Moreover, its rectangular anatomy is practically identical to the cross-section of
a car body. And so the boxfish became the model” for the Daimler-Chrysler bionic concept car
[368].
#2: The design is feasible.
The Daimler website describes the Daimler-Chrysler bioinic concept car as “fully-functioning
and driveable” [368].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
“The application of bionics can easily be illustrated by means of the Mercedes concept car
called Bionic Car…The vehicle study was made with the most favorable contours of the boxfish
as seen from a fluid mechanics point of view. The air drag coefficient of 0.19 was a peak in
aerodynamic performance” [41]. This statement indicates that the bionic car is aerodynamic and
has low drag as a result of its bioinspired shape. These features are likely to result in lower fuel
consumption.
Competitor Description
The competitor of bionic-shaped car is the same car that has a standard body shape. In order to have
approximate environmental data on this theoretical car, the BMW 3 series sedan was selected because it is
approximately the same size as the bionic car. The drag coefficient (cw) of the BMW 3 Series, which is a
function of the shape of the car, is 0.27 [369].
BMW 3 Series Sedan [370].
170
Comparison of Environmental Impact of BID and Competitor
The Daimler-Chrysler bionic car gets 70 miles per gallon, “about 30 percent more than for a standard-
production car” [368]. The Daimler website attributes the low fuel consumption of the bionic concept car to
the bioinspired features of the design: “the optimal aerodynamic properties derived from the boxfish and
[another bioinspired feature] create the conditions for a low fuel consumption and excellent performance”
[368]. A substantial portion of this fuel consumption reduction can likely be attributed to the reduction in
drag of the bioinspired car over a standard similarly-sized car, such as the BMW 3 Series Sedan. According
to the Daimler website: “with a Cd value of 0.19 the fully-functioning and driveable Mercedes-Benz bionic
car is among the aerodynamically most efficient in this size category” [368]. By comparison, the drag
coefficient of the BMW 3 Series Sedan is 0.27 [369], significantly greater than the 0.19 measured for the
Daimler-Chrysler Bionic Car [368].
171
A.3 DAIMLER-CHRYSLER BIONIC CAR – STRUCTURE
Field
Mechanical Engineering
Biological Analogy
Material allocation in bone growth
Environmental Advantage
Less material used in the car
frame; weight and fuel
consumption reduction
Company
DaimlerChrysler Competitor
Same car without bioinspired
structure
Life Cycle Phase
Materials and Use
Biological Analogy Description
Bones change in size and shape depending on how they are stressed in a process called modeling. In
modeling, material is added to bones in high stress areas and is removed from bones in low-stress areas
[235,236,371]. As a result of the modeling process, bones are both “strong and relatively
lightweight”[277].
Porous bone structure [314].
Bioinspired Design Description
The frame of the bionic car was designed to be as lightweight as possible using soft kill option (SKO)
software. SKO is a finite-element model inspired by bone growth [372] that allocates material only where
stresses require.
Model of bionic car’s structure[373].
172
Selection Criteria Verification
#1: The design is truly bioinspired.
According to Daimler’s website, the project to design the Mercedes-Benz bionic concept car
was a “unique research project by biologists and engineers” which utilized a “bionic design
process for intelligent lightweight construction” [368].
The Daimler site also states: “bone structures… show how nature achieves maximum strength
with the minimum use of materials. Bone structures are always in accordance with actual loads
encountered… In consultation with bionics experts, DaimlerChrysler researchers have
developed a computer-assisted process for transferring the growth principle used by nature to
automobile engineering. It is based on the SKO method (Soft Kill Option)… This bionic SKO
process enables an optimal component geometry which meets the requirements of lightweight
construction, safety and durability in equal measure” [368].
On the Daimler press site, the features of the bionic concept car are listed. It states: “Roof
structure with large areas of glass, calculated and designed according to the bionic SKO
method” [374].
In a 2009 paper, Mattheck, the developer of the SKO method, states: “SKO is a FEM-based
method that is inspired by osteoclasts in bones nibbling away non-loaded parts in the bony
structure” [375].
Of course, this design is indirectly bioinspired because the software was created to make bone-like
structures; the structure was not directly taken from the appearance of a bone that is loaded similarly
to how a car is loaded, for instance.
Additionally, there is some controversy regarding whether SKO software is inspired by tree growth.
For instance, Vincent claims that “Soft Kill Option (a finite-element model by Mattheck (1989)
developed from his studies on stress-relieving shapes in the adaptive growth of trees) was used to
design the chassis of the DaimlerChrysler Bionic Car” [11]. I believe Vincent is either confused or
using misleading language here. Mattheck developed two separate optimization tools based on
biological studies. SKO is based on bone, while CAO is based on tree growth. I confirmed in an
email with Mattheck [372] that SKO software is not inspired by tree growth.
#2: The design is feasible.
The Daimler website describes the Daimler-Chrysler bionic concept car as “fully-functioning
and driveable” [368].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
A great potential weight reduction for the bionic structure is associated with the use of
bioinspired SKO software in the design: “If the complete body-in-white structure is considered
according to the SKO method, the weight is decreased by around 30%, while at the same time,
the stability, crash safety, and driving dynamics are excellently maintained” [41]. This weight
reduction will translate to a reduction in fuel consumption, and hence, a reduced environmental
impact.
The following quote from Vincent presents a similar estimate for weight savings: “Parts of the
recent and much-touted boxfish concept car, a design study by Daimler-Chrysler, used a stress-
relieving design tool developed by Claus Mattheck, who studied the growth of trees to gain an
173
insight into how nature would deal with the strength-to-weight problem. The resulting weight
savings was on the order of 40 percent” [294]. Although Vincent is mistaken about the
biological source of inspiration for the design, discussed above, this quote is still included
because the weight savings estimate is presumably still correct. This weight reduction will
translate to a reduction in fuel consumption, and hence, a reduced environmental impact.
Competitor Description
The competitor of the bioinspired structure of the bionic car is the same car that has a standard frame.
Frame of a typical sedan [376].
Comparison of Environmental Impact of BID and Competitor
The Daimler-Chrysler bionic car has around a 30% [41,368] to 40% [294] lower weight and 30% lower
fuel consumption than a standard car [368]. The Daimler website attributes the low fuel consumption of the
bionic concept car to the bioinspired features of the design: “[another bioinspired feature] and a new
lightweight construction concept taken from nature create the conditions for a low fuel consumption and
excellent performance” [368].
174
A.4 EASTGATE CENTRE COOLING SYSTEM
Field
Architecture
Biological Analogy
Cooling in termite mounds
Environmental Advantage
Reduced electricity use
Company
Arup Madrid – Construction
Pearce Partnership - Design
Competitor
Electric air conditioner for a
building of similar size in the
same location
Life Cycle Phase
Use
Biological Analogy Description
At least two models for airflow and cooling exist for termite mounds. The first is for capped chimney
termite mounds. In this model, heat from the colony rises to the top of the mound, where the warm air is
released through the porous surface, and where cooler, denser air comes in and then sinks to the bottom of
the nest [34]. The second model is for open chimney termite mounds. In this model, the top of the mound is
above the boundary layer, meaning air blowing past the top of the mound has a higher velocity than air at
the openings near the ground; this difference in air velocity generates a Venturi flow which draws in air at
ground level, through the mound and out the chimney [34]. These two models are depicted below.
Models of fluid flow in termite mounds [34].
Bioinspired Design Description
Eastgate Centre is structured to promote desirable fluid flow. It has a series of chimneys along its length
and openings at ground level. Rising heat generated by people and machinery in the building causes
thermosiphon flow, and chimneys on the roof, above the boundary layer of the wind, prompt induced flow,
drawing hot air out the chimney and cool air in at ground level [34]. The cooling system in Eastgate is also
designed to take advantage of the 10 to 14 degree Celsius diurnal temperature swings experienced in
Harare, Zimbabwe; the building draws in cool air at night and allows warm air to rise out of the building
during the day [32]. Eastgate Centre’s passive cooling system is assisted by fans [29]. At night, the fans
draw in cool air at ground level at a rate between seven and ten air changes per hour [29-31], cooling the
175
entire building and the concrete mass upon which the building rests. During the day, cool air is drawn into
the building near ground level and is cooled further by the concrete floor that serves as a thermal mass.
.
Eastgate Centre exterior [35]. Diagram of airflow in Eastgate Centre [32].
Selection Criteria Verification
#1: The design is truly bioinspired.
Mick Pearce, the lead architect for Eastgate, quotes a passage from the 2003 Prince Claus
Award he received for the Eastgate design on his curriculum vitae. The passage states: “Based
on the termite mound analogy, Mick Pearce’s Eastgate building uses the mass of the building as
insulation and the diurnal temperature swing outside to keep its interior uniformly cool” [33].
Although the passage on the award is not considered a reputable source for proving that a
design is bioinspired, the fact that Mick Pearce included this passage on his CV indicates that
he is, at least, not opposed to the claims made in the passage.
Additionally, there is a quote from Mick Pearce cited in the book The Architectural Expression
of Environmental Controls where Pearce discusses the design of Eastgate Centre. He states: “If
the termites could create a natural air-conditioning system, we must be able to use that as a
model and that grew and it remained with us for the whole design period” [30].
Although neither of the sources cited above is a direct statement in a primary source, taken together, they
provide sufficient evidence that Eastgate Centre was truly bioinspired.
#2: The design is feasible.
Construction of Eastgate was completed in April 1996 [29].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
The associate director of Arup states in peer-reviewed conference paper that, according to data
monitoring building performance “subsequent to the completion of construction,” Eastgate
“consumes up to 50% less energy than a comparable air conditioned office building” in Harare
[32].
176
Competitor Description
Eastgate Centre’s passive cooling system was compared to a theoretical similarly-sized office building in
Harare with an industrial-sized electric air-conditioning system. A traditional industrial air conditioning
system would involve a substantial mass of equipment and would consume a large amount of electricity. In
2008, the most recent year for which data is available, approximately 53% of electricity in Zimbabwe came
from hydropower, 46% from coal and peat, and the remainder from petroleum [268].
Industrially-sized electric air conditioner [377]. Much electricity in Zimbabwe is from coal[378].
Comparison of Environmental Impact of BID and Competitor
Compared to an industrial air conditioning system run on electricity from hydropower, coal/peat, and
petrolum, Eastgate Centre’s passive cooling system is environmentally superior.
First, Eastgate has reduced number of ‘active’ energy inputs compared to a standard industrial air
conditioner, i.e. Eastgate consumes less electricity, fossil fuels, and energy from engineered energy-
harvesting devices than an industrial air conditioning system would.
Second, Eastgate has reduced carbon emissions because it consumes less electricity than an industrial air
conditioning system, and a large percentage of the electricity in Zimbabwe is produced from carbon-
intensive sources. As stated above, approximately 53% of electricity in Zimbabwe comes from hydropower
[268]. While the relative environmental impact of hydropower compared to other electricity resources is
small, there are still significant carbon emissions associated with the construction of dams and flooding of
land for dams, as well as an impact on wildlife in the rivers. Additionally, coal, peat, and oil, which make
up for the remaining 47% of electricity production in Zimbabwe [268], all have well-know
environmentally-damaging effects, particularly with regard to greenhouse gas emissions.
Finally, the energy resources used in Eastgate Centre are more renewable and abundant than the sources of
electricity that would be needed to power an industrial air conditioner. The passive cooling system in
Eastgate runs for the most part without active energy due to the shape of the building and the dynamics of
fluid flow in those spaces. Essentially, this system runs on ambient heat, which is renewable and abundant.
In contrast, an industrial air conditioner in Zimbabwe runs on electricity from hydropower, coal, peat, and
petroleum. In general, hydropower is considered a renewable energy resource because the supply of
freshwater in rivers that generate hydropower is naturally replenished. However, hydropower resources are
vulnerable to climate change and extreme weather events, such as drought, meaning these resources are not
always renewable and abundant. Additionally, coal, peat, and petroleum are all considered nonrenewable
fossil fuel resources. In terms of the abundance of these resources in Zimbabwean context, coal and peat
are relatively abundant while petroleum is not; over the last 40 years, Zimbabwe has consistently been able
to supply enough coal and peat to meet all of its own needs, but its oil demand has been wholly supplied by
imported sources [268].
177
A.5 INTERFACE FLOR I2 ENTROPY CARPET
Field
Artistic design
Biological Analogy
Random patterns on forest floor
Environmental Advantage
Reduction in scrap rate and
maintenance, longer product life
Company
InterfaceFLOR Competitor
Conventional modular carpet
with a nap orientation that needs
to be from a particular dye lot
Life Cycle Phase
Use
Biological Analogy Description
A forest floor is aesthetically attractive and is covered in leaves, sticks, pinecones and a wide range of other
materials with different shapes and colors that fall to the ground in random positions. This randomness
makes it difficult to spot something that might otherwise look out of place.
A forest floor [379].
Bioinspired Design Description
Interface FLOR’s i2 Entropy modular carpet has an artistic design composed of a seemingly random
assortment of shapes and colors within the individual tiles. Similar to a forest floor, the random shapes and
patterns in the design make it difficult “for any tile to look out of place” [380]. Because of this intentional
randomness, one can place tiles from different dye lots and tiles with different nap orientations next to each
other without ruining the aesthetics of the carpet [380]. Additionally, the random pattern allows old tiles to
be replaced with new tiles from different dye lots, without having the visual differences between old and
new tiles and tiles from different dye lots be problematic [380]. Consequently, the randomness
incorporated into the artistic design of the tile reduces scrap rates during tile production and installation,
and extends the attractive and useful life of the carpet as a whole.
178
i2 Entropy carpet tiles with seemingly random patterns [381].
Selection Criteria Verification
#1: The design is truly bioinspired. According to Eric Nelson, vice president of Interface Americas, “the Interface designed team
looked to nature to find a more efficient, less wasteful approach to design. The team noticed
that nature produced randomness rather than uniformity (every rock is different in size and
shape, no two leaves are the same, etc.). This idea gave birth to Entropy®” [382].
Interface FLOR’s website: “Using the principles of biomimicry, we created i2TM
, our second
design platform. Biomimicry seeks sustainable solutions by using nature as a model. Like
leaves on a forest floor, i2 tiles vary from one to the other – yet they come together to form a
beautiful floor” [279].
The case of Entropy carpet is a borderline case because nature-inspired designs are not necessarily
biologically-inspired. If Entropy was inspired by the fact that no two rocks are the same, it would be a
geologically-inspired design, not a biologically-inspired one. However, one of the quotations above
explicitly states that biomimicry was used to create i2 tiles, and both sources mention being inspired by
leaves on a forest floor. Hence, it the Entropy carpet tiles are assumed to be bioinspired.
#2: The design is feasible.
Entropy was launched in early 2000 [383].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
Entropy carpet “mimics the randomness of the forest floor with small sections, or tiles, each
composed of different shades of color. Because color matching is no longer a problem, only a
worn or damaged section needs replacement” [384]. This suggests that the bioinspired
randomness in the pattern allows the carpet as a whole to have a longer use phase.
Competitor Description
Typical modular carpet tiles with a specific solid color or pattern are used as the competing product. It is
assumed that the patterns on adjacent tiles and their nap direction must be aligned and all tiles - or tiles of
the same type – are from the same dye lot [380].
179
For instance, for the carpet below, it is important that all the logo tiles were created in the same dye lot so
that the colors of all the tiles match; the same is true for all the solid blue tiles. If one of the blue tiles was
from a different dye lot, and was slightly greener for instance, it would stand out. This means that all the
carpet tiles for a particular room and all replacement tiles for that room are purchased at the same time and
come from the same dye lot. It also means that when tiles are replaced, the overall appearance of the carpet
will be diminished. For instance, after ten years, the carpet below will become faded. If one of the blue tiles
were replaced with another from the same dye lot that had been sitting in storage, it would stand out as the
only bright and new tile in the room.
Additionally, it is important for all the logo tiles to be facing the same direction and for the checkerboard
pattern of tiles to be maintained. If this photo depicted the carpet on a smaller scale, it would become
apparent that it is also important to have the nap directions aligned, in much the same way it is important
for someone sewing a striped shirt to ensure that the left side of the shirt does not have horizontally-
oriented stripes when the right side of the same shirt has vertically-oriented stripes.
Typical carpet tiles [385] have a particular orientation matching colors.
Comparison of Environmental Impact of BID and Competitor
The randomness in the artistic design of Entropy carpet tiles reduces scrap rates in production and
installation and increases the useable, aesthetically-pleasing life of the carpet as a whole, compared to
standard modular carpets. “Given the apparent randomness of the pattern and color scheme, worn or soiled
tiles in a particular installation may easily be replaced with and unused tile without the new tile looking as
dramatically different from the remaining tiles as often results with tiles with conventional patterns” [380].
Although not here selected as the competing product for analysis, Entropy also presents a sustainability
advantage over conventional broadloom carpets for the same reasons – less waste in installation and a
longer carpet life. Eric Nelson, vice president of Interface Americas states in an article in Global Business
and Organizational Excellence: “Compared with broadloom, which can entail as much as 14 percent waste,
Entropy tiles can be installed two-and-a-half times faster and with as little as 1.5 percent waste” [382].
180
A.6 SELF-CLEANING TRANSPARENT THIN FILM
Field
Materials Science
Biological Analogy
Lotus leaf Environmental Advantage
Consumes less water and harsh
chemicals during cleaning
Company
The University of Tokyo, Sofia
University, Daido Institute of
Technology
Competitor
Standard surface cleaned using
spray or ultrasonic aqueous
cleaning methods
Life Cycle Phase
Use
Biological Analogy Description
The leaves of Nelumbo nucifera, or lotus, plant are water-repellant, or hydrophobic, causing water to bead
on the surface of the leaf, as is shown in the photograph below. This feature causes the lotus leaf to exhibit
self-cleaning properties: “contaminating particles are picked up by water droplets or they adhere to the
surface of the droplets and are then removed with the droplets as they roll off the leaves” [17]. This process
is depicted in the diagram below on the right. This self-cleaning propensity is known as the ‘lotus effect’
and provides a biological advantage to the plant by allowing it to avoid damage caused by chemical
contamination from the air, as well as protecting the it from pathogens, such as spores and conidia, by
depriving them of water [17].
Water droplets on a lotus leaf [45]. Diagram of self-cleaning process [386].
Bioinspired Design Description
Nakajima et al. [42] present in a 2000 paper a thin film that is transparent, durable, and superhydrophobic,
meaning it repels water as the lotus leaf does. Consequently, like the lotus leaf, this thin film also
distributes self-cleaning properties. The film can potentially be applied to the surface of parts so that they
can be cleaned by spraying a mist of water on the part, as opposed to using spay cleaning or aqueous
cleaning techniques [43]. The dirt particles on the surface of the part can then be absorbed into the beads of
water that form and roll off the part[27].
181
Surface with self-cleaning coating [44]
Selection Criteria Verification
#1: The design is truly bioinspired.
In their 2000 paper in Langmuir, Nakajima et al. mention the connection between their self-
cleaning thin film and the lotus leaf: “the excellent hydrophobicity of … superhydrophobic
surfaces gradually degrades, in general, during long-time outdoor exposure due to the buildup
of stain. This was a crucial and inevitable problem for artificially constructed superhydrophobic
surfaces. Natural lotus leaves avoid this problem by continuous metabolism of their surface wax
layer and maintain their hydrophobicity during their lifetime. Since a proper metabolic
mechanism of lotus leaves is difficult to duplicate, practical applications of superhydrophobic
surfaces have been limited” [42]. The authors of this paper take for granted that the lotus leaf is
a biological analogy for the self-cleaning thin film they are presenting.
#2: The design is feasible.
Nakajima et al. describe their transparent, superhydrophobic thin films with self-cleaning
properties in detail in Langmuir [42]. The thin film is a fully-functional prototype, although the
method by which it is produced is still in development. “Although the preparation of
superhydrophobic surfaces has been extensively studied, only a few methods have been
reported for transparent films thus far”[387], and there is only laboratory scale production.
However, the thin films themselves are fully-functional, and the bioinspired innovation is one
related to behavior of the product in the use phase, not an innovation in production.
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
A life cycle analysis study from Raibeck et al. examined the environmental impact of the use
phase of cleaning gears with a bioinspired self-cleaning surface, compared to gears with a
standard surface, cleaned using aqueous cleaning methods. It found “a large water and energy
savings when using the self-cleaning surface” [43].
From a peer-reviewed conference paper from the same research group presenting life cycle
analysis results on this self-cleaning transparent thin film presented in the Nakajima et al.
paper: “Environmental benefits are obvious in the use phase of a self-cleaning coating, as
compared to industrial cleaning methods. Much less energy and water is consumed when
cleaning a self cleaning surface, as compared to spay or ultrasonic aqueous cleaning methods.
The aqueous cleaning methods also require solvents which create additional environmental
burdens” [27].
182
Competitor Description
The self-cleaning surface was compared to a standard surface on a part regularly cleaned using either
ultrasonic aqueous cleaning or spray cleaning techniques. Raibeck et al. explain the difference between
these two cleaning methods:
In ultrasonic cleaning, the part to be cleaned is submerged in a solution of water and solvent, and
sound waves are used to produce bubbles through cavitation. The vibration of the bubbles removes
contaminants from the part. In spray cleaning, a solution of water and solvent is sprayed from
many angles onto a part. Spray cleaning machines often have additional rinse and drying stations.
[27]
Because ultrasonic cleaning and spray cleaning are both feasible competitors for the self-cleaning thin film,
and because relevant environmental data was available for both methods, both were analyzed.
Ultrasonic cleaning of forceps [388]. Spray cleaning machine [389].
Comparison of Environmental Impact of BID and Competitor
A life cycle inventory study of self-cleaning thin film conducted by Raibeck et al. [27] found that,
compared to both the spray and ultrasonic cleaning methods, the self-cleaning coating provides
environmental benefits during the coating’s use phase because it requires less energy and water. The
potential environmental benefits of the self-cleaning surface are countered by the resource consumption and
emissions resulting from the production of chemicals used to make the coating; “The production of the self-
cleaning coating consumes more than 10 times the energy it takes to clean it” [27]. Consequently, an
engineer designing a system must know how often the system will be cleaned during its lifetime and what
alternative cleaning methods are available, in order to choose the option with the lowest environmental
impact. In this case, if the use phase of the design is expected to overwhelmingly dominate the product’s
environmental impact, it is likely that the incorporation of the bioinspired sustainable design solution from
the lotus leaf will lead to a more sustainable design.
183
A.7 SHARKLET ANTIMICROBIAL SURFACE
Field
Materials Science
Biological Analogy
Surface texture of shark skin Environmental Advantage
Reduced need to clean surface,
leading to reduced consumption of
toxic chemical during cleaning, and
risk of evolution of ‘superbugs’
Company
Sharklet Technologies, Inc. Competitor
Clorox disinfectant bathroom
cleaner
Life Cycle Phase
Use
Biological Analogy Description
“The skin of fast-swimming sharks” has micro ridges on it, called dermal dentricles or riblets [390] that
prevent biofouling, the attachment of unwanted microorganisms on a surface [266,390]. These riblets are
“aligned in the direction of fluid flow” and are spaced in such a way as to prevent organisms from attaching
to the surface [390]. This feature is beneficial to fast-swimming sharks because biofouling organisms create
drag and would require the shark to expend more energy while swimming. Because the skin of fast-
swimming sharks is void of biofouling organisms, it is considered by some to be “a prominent example of a
low friction surface in water” [266].
Left: Topography of shark skin. The bar in the top left is 500 µm [391]. Right: Shark [392].
Bioinspired Design Description
Sharklet antimicrobial surfaces are strips that can be applied to a variety of surfaces, such as bathroom door
panels or countertops, to control bacterial growth between cleanings. Sharklet strips have a patterned
microtopography inspired by shark skin that prevents the growth of bacteria without the use of chemical
biocides. In an experiment measuring biofilm formation of Staphylococcus aureus on Sharket surfaces,
observations suggested that “the protruded features of the topographical surface provided a physical
obstacle to deter the expansion of small clusters of bacteria present in the recesses into microcolonies”
[267]. Because bacterial buildup occurs more slowly on Sharklet surfaces, these surfaces need to be cleaned
184
less frequently, meaning less cleaning chemicals are consumed during the life of the surface. Sharklet strips
have a life of 90 days [393].
Sharklet topography[264] . Sharklet push door plates [394].
Selection Criteria Verification
#1: The design is truly bioinspired.
Sharklet’s website, promotional materials, patents, and academic papers from one of Sharklet’s founders
indicate that the design for Sharklet is bioinspired and was inspired by the topography of shark skin:
Sharket’s website tells the story of how Sharklet was developed when the inventor was working
on preventing algae from coating vessels for the navy and developed an antifouling strategy
based on shark skin. The website states: “Sharklet Technologies is… honored to offer a
biomimetic technology inspired by the shark”[264].
Sharklet promotional materials: “Sharklet is biomimetic – it is inspired by the shape, pattern
and microbe resistant properties of shark skin” [395].
Sharklet patents: “The Sharklet topography is based on the topography of a shark’s skin” [266].
Peer-reviewed papers from one of Sharklet’s founders: The use of a model correlating
wettability with bioadhesion “led to the design concept of a biomimetic structure inspired by
the skin of fast-moving sharks (Sharklet AFTM)” [267].
#2: The design is feasible.
Sharklet Surface Protection samples can currently be purchased online on Sharklet’s website
and more Sharklet products are sold by Tactivex [394].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
According to a Sharklet patent, Sharklet surfaces reduce the energy required during cleaning:
Sharklet surfaces “can provide reduced energy and cost required to clean surfaces of biofouling
by reducing biofouling in the first place. As a result, there can be longer times between
maintenance/cleaning of surfaces” [266].
Sharklet is non-toxic. In the ‘Field of the Invention’ section for another Sharklet-related patent,
it states: “The invention relates to articles and related devices and systems having surface
topography and/or surface elastic properties for providing non-toxic bioadhesion control”
(italics mine) [396]. It also states:
185
The present invention describes a variety of scalable surface topographies for modification of
bio settlement and bioadhesion, such as bioadhesion of biofouling organisms including, but not
limited to, algae, bacteria and barnacles… it has been proven through experimental testing that
surface topographies according to the invention provide a passive and non-toxic surface, which
through selection of appropriate feature sizes and spacing, can significantly… reduce settlement
and adhesion of the most common fouling marine algae known, as well as the settlement of
most barnacles (italics mine) [396].
Additionally, there is reason to believe Sharklet is environmentally advantageous because it
does not support the evolution of superbugs. The Sharklet website (not peer-reviewed) states:
Sharklet “Offers no risk for antimicrobial resistance. It is the Sharklet-textured surface alone
that disrupts bacteria’s ability to survive, not antimicrobial agents that contribute to the
development of ‘superbugs’”[397]. There are no claims found in peer-reviewed literature that
overtly agree with this statement. However, the claim that Sharklet does not contribute to
antimicrobial resistance is supported by biological peer-reviewed literature that describes how
superbugs evolve.
“The term ‘superbugs’ refers to microbes with enhanced morbidity and mortality due to
multiple mutations endowing high levels of resistance to the antibiotic classes specifically
recommended for their treatment” [398]. Superbugs evolve through the widespread use of
antibiotics and biocides, such as those found in cleaning products: “The development of
generations of antibiotic-resistant microbes and their distribution in microbial populations
throughout the biosphere are the results of many years of unremitting selection pressure from
human applications of antibiotics, via underuse, overuse, and misuse” [398]. Additionally, “The
limited scientific evidence available indicates that bacterial resistance to biocides may
contribute to the development and dissemination of antibiotic resistance, which is a serious
concern relative to the worldwide anti-infective therapy for humans and animals” [399]. There
is no evidence to suggest that products, such as Sharklet, that prevent bacterial growth through
non-chemical mechanisms, would contribute to the evolution of superbugs.
Competitor Description
Clorox Disinfecting Bathroom Cleaner was selected as an appropriate competitor for Sharklet antimicrobial
surfaces because both products could be used to prevent bacteria growth in a bathroom. Clorox disinfecting
bathroom cleaner is a chemical cleaner that contains: water, butoxydiglycol, tetrapotassium EDTA
(ethylenediaminetetraacetic acid), alkyl polyglucoside, alkyl dimethyl benzyl ammonium chloride, alkyl
dimethyl ethylbenzyl ammonium chloride, amine oxides, fragrance, and silicone emulsion [400]. It is
meant to be sprayed on dirty bathroom surfaces, allowed to stand for 10 minutes if the user is trying to
disinfect the surface, and then be wiped off the surface [401]. Reportedly, it “kills 99.9% of germs
commonly found in bathrooms” [402].
186
Clorox Disinfecting Bathroom Cleaner [400].
Comparison of Environmental Impact of BID and Competitor
According to its material safety data sheet, Clorox disinfecting bathroom cleaner contains four hazardous
substances: (1) Diethylene glycol monobutyl ether (DGBE), (2) Tetrapotassium ethylenediamine
tetraacetate (ETDA), (3) n-Alkyl dimethyl benzyl ammonium chloride (ADBAC), and (4) n-Alkyl dimethyl
ethylbenzyl ammonium chloride [403].
The second substance listed – ETDA – is not biodegradable. According to DOW Chemical, “Salts of
EDTA do not pass tests as ‘readily biodegradable’ ” [404], meaning that a typical bathroom cleaner, such
as Clorox, is not biodegradable.
There is strong reason to believe that the third substance - ADBAC - contributes to the development of
superbugs. “Although the concentrations of the active agents at the point of application can be generally
controlled, sub-lethal exposure to biocide occurs as they become dissipated in the environment” and can
consequently exert selection pressure [405]. “The widespread incorporation of antibacterial agents into
consumer products has compounded the problem, especially for agents with lower chemical reactivity, such
as the quaternary ammonium compounds” (QACs) [405]. QACs “are biocides that have recently come
under scrutiny for their role in antibiotic resistance… Many studies have shown that exposure to QACs at
subinhibitory concentrations leads to the selection of intrinsically resistant bacteria in a microbial
community or results in the development or acquisition of resistance mechanisms” [399]. The Center for
Disease lists ADBAC as a quatemary ammonium compound [406]. This implies that use of ADBAC could
lead to the development of resistance mechanisms in bacteria and ultimately contribute to the evolution of
superbugs.
Additionally, ADBAC is toxic to many different kinds of animals. The EPA categorizes ADBAC “as
highly toxic to fish… and very highly toxic to aquatic invertebrates… on an acute exposure basis” [407].
ADBAC is also “moderately toxic to birds” and “slightly toxic to mammals on an acute basis” [407].
In contrast to chemical biocides, such as those found in Clorox, Sharklet is nontoxic and does not
contribute to the evolution of superbugs. Instead, the shape, size, and spacing of features on Sharklet’s
surface “physically interfere “with the settlement and adhesion of microorganisms” [396]. Sharklet surfaces
prevent bacteria growth, meaning that these surfaces stay cleaner longer and consequently need to be
cleaned less frequently.
Sharklet has to be thrown away after 90 days and presumably disposed of in a landfill. Clorox most likely
is either rinsed down the drain, or is disposed of in a landfill on paper towels and other cleaning supplies.
187
A.8 SHINKANSEN 500 SERIES NOSE CONE
Field
Mechanical Engineering
Biological Analogy
Piscivore kingfisher beak Environmental Advantage
Reduction in electricity consumption,
Quieter
Company
West Japan Railway Company
Hitachi
N+P Industrial Design
Competitor
A standard nose cone,
approximated using the
Shinkansen 300 Series
Life Cycle Phase
Use
Biological Analogy Description
There are two types of kingfishers: piscivores and insectivores. Piscivore kingfishers have a distinctive bill
shape, described by some as “narrow black spear-shaped bills” [408], or “needlelike mandibles” [409].
These can be seen in the images below.
Kingfishers [410,411].
Bioinspired Design Description
The 500 Series Shinkansen is an award-winning Japanese train that was “Regarded as the fastest electric
train in commercial operation in 1998” [412]. It has a maximum operating speed of 300 km/h, and a
maximum speed of 320 km/hr [413].
However, higher train speeds are associated with higher noise, and “In Japan, noise is said to be the greatest
impediment to raising commercial speeds” of trains [414]. Noise is particularly an issue when tracks run
through tunnels, and “Half of the entire Sanyo Shinkansen Line (from Osaka to Hakata)” – where the 500
series Shinkansen runs – “is made up of tunnel sections” [415]. “When a high-speed railway train enters a
tunnel, a compression wave is generated ahead of the train and propagates along the tunnel. Subsequently
this wave is emitted outward from the exit toward the surrounding area as an impulsive wave which causes
an impulsive noise like a sonic boom produced by a supersonic aircraft” [416]. This boom and aerodynamic
vibration for some trains has been “so intense that residents 400 meters away have registered complaints”
[415]. Consequently, measures had to be taken during the design of the 500 Series Shinkansen to reduce
noise.
188
High speed trains create compression waves in tunnels, causing a loud noise when it exits [417].
One of the noise-reduction measures was to change the shape of the train’s nose cone to better handle the
transition from low pressure air to high pressure air found in tunnels. The shape of the nose cone was
inspired by the shape of a kingfisher’s beak, as described previously. “The Shinkansen bullet train design
uses a conical nose to achieve high speeds and reduce noise while exiting tunnels” [62]. The nose “has a
streamline shape that is 15m in length and almost round in cross section” [415].
Left: Shinkansen nose cone [418]. Right: Sketch connecting Shinkansen’s tunnel exit to kingfisher [419].
Selection Criteria Verification
#1: The design is truly bioinspired.
Eiji Nakatsu, the director responsible for test runs of the 500 Series Shinkansen, recalls how the
nose cone of the Shinkansen came to be inspired by the kingfisher:
[O]ne of our young engineers told me that when the train rushes into a tunnel, he felt
as if the train had shrunk. This must be due to a sudden change in air resistance, I
thought. The question the occurred to me - is there some living thing that manages
sudden changes in air resistance as a part of daily life? … To catch its prey, a
kingfisher dives from the air, which has low resistance, into high-resistance water, and
moreover does this without splashing. I wondered if this is possible because of the
keen edge and streamlined shape of its beak. So we conducted tests to measure
pressure waves arising from shooting bullets of various shapes into a pipe and a
thorough series of simulation tests of running the trains in tunnels, using a space
research super-computer system. Data analysis showed that the ideal shape for this
Shinkansen is almost identical to a kingfisher's beak [415].
189
While overcoming differences across the air/water interface is critical for the kingfisher to be
successful fishing, and this interface represents an abrupt change in pressure, there is no
evidence in biological literature indicating that the shape of the kingfisher’s beak is particularly
well-suited for overcoming this transition. In contrast, a number of authors describe splashes
when the kingfisher dives. Skutch describes the fishing behavior of the Amazon Kingfisher:
“Suddenly the wings close, the hazy circles vanish, the kingfisher plunges swiftly downward,
head foremost and breaks the surface with a splash”[420]. Remson refers to the disruption
caused by the dive of a kingfisher: “After a dive, a kingfisher almost always moved to a new
perch overlooking a new patch of water. The disturbance created by the dive probably alerted
small fishes in the area to surface predation, and it was then presumably more profitable to
move on” [421]. Marshall describes the loud plop Azure Kingfisher’s make while fishing: “It
was interesting to watch the birds dive into water only a few inches deep from a considerable
height, strike the surface with a loud ‘plop,’ turn swiftly, and fly to the same bough with their
catch” [422].
While the biological phenomenon that inspired Nakatsu may not be supported by the biological
literature, or may not be unique to kingfishers and therefore not prominently discussed in
literature on kingfishers, is of little consequence. As in the case of Eastgate Centre’s cooling
system, all that is critical is that the design was inspired by nature, not that the designer
understood the natural system completely.
#2: The design is feasible.
The Shinkansen 500 Series has been in operation since 1997 [413,277].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
Both of the environmental claims made about the nose cone of the Shinkansen 500 series – (1)
that it reduces the electricity consumption of the train and (2) that it is quieter – are somewhat
problematic, although both prove to be sufficiently supported in the literature as representing a
true and meaningful environmental impact reduction.
First, claims are frequently made in gray literature indicating that the shape of the kingfisher-
inspired nose cone has reduced the electricity consumption of the train. For instance, Eiji
Nakatsu states in his Japan for Sustainability Newsletter interview that the shape of the nose
cone “has enabled the new 500-series to reduce air pressure by 30% and electricity use by
15%, even though speeds have increased by 10% over the former series” [415]. This source is
cited in a number of reliable online sources, including Ask Nature [423]. These same numbers
also appear in an article in Wired Science [277].
Additionally, there are numerous related, albeit less explicit, statements in academic literature.
For instance, books on the 500 Series Shinkansen describe the train as a “synthesis of
aerodynamics, technology, and design” [412] and as having “an extremely aerodynamic
profile” [424]. Also, observations have been made indicating that the 500 series generates less
wind than other trains when existing tunnels, despite the fact that it is moving faster [413].
These statements referring to ‘aerodynamic’ profiles and a reduction in wind imply that the
train has less drag and, consequently, would consume less electricity, as is claimed in the gray
literature. These statements taken together indicate that there truly is a reduction in electricity
190
consumption of the Shinkansen as a result of its bioinspired nose cone.
Finally, it is not surprising that the noise-reduction aspects of the nose cone are more heavily
emphasized in the literature than the reduction in electricity consumption. An article in the
Japan Railway and Transport Review confirms: “noise and vibration are two areas of particular
attention in Japan because reducing them ensures a better environment for trackside residents.
In general, aero-acoustic noise is reduced by using smooth exterior surfaces and reduced air
resistance is a bonus” [414]. Since the attention of the designers and Japanese community
members appears to have been on noise reduction – and not environmental impact in general –
it is not surprising that a discussion on the reduced environmental impact is not prominent in
literature on this topic.
Second, numerous academic sources agree that the 500 Series Shinkansen is quieter as a result
of its bioinspired nose cone.
o A refereed conference paper states: “The Shinkansen bullet train design uses a conical
nose to… reduce noise while exiting tunnels” [62].
o A book on the Shinkansen trains agrees: the author observed while “Standing next to
tunnels along the Sanyō Shinkansen,” that “While the 500-series shinkansen was
travelling at 300 km/hr, it was often the 0-series travelling some 90 km/hr slower that
made the most noise” [413].
The noise reduction is likely due to a variety of factors, including the kingfisher-inspired
profile.
Claims are also made in gray literature that the 500 Series Shinkansen is quieter as a result of its
bioinspired nose cone.
o An article in Wired Science states that “By modeling bullet train noses on kingfisher
beaks, West Japan Railway Company engineers created the 500 series… The trains are
quieter, 10 percent faster and use 15 percent less electricity” [277].
o Ask Nature states: “The Shinkansen Bullet Train has a streamlined forefront and
structural adaptations to significantly reduce noise resulting from aerodynamics in
high-speed trains” [282].
This claim that the reduced noise output by the Shinkansen is an environmental benefit may be
problematic because product noise may not be considered a true or significant environmental
impact. Instead, it may be viewed as a purely aesthetic feature of the product, or as a local and
immediate environmental impact that is not of interest if one is looking at environmental impact
from a global or national perspective. However, as discussed in Chapter 2, noise is considered a
true environmental impact in this analysis. Additionally, number of other reputable sources
describe noise as having a true environmental impact.
o The United States Environmental Protection Agency (EPA) considers noise to be
pollution [425].
o Tanaka et al. discuss noise standards as ‘environmental standards’ that affect the
‘living environment’; “very strict environmental quality standard against Shinkansen
noise is applied for the purpose of keeping a pleasant living environment” [426].
o OECD documents refer to ‘noise emissions’ in the context of a discussion on
globalization, transportation, and the environment; “International road and rail freight
transport accounts for a minor, but increasing , share of global transport emissions of
air pollutants (e.g. NOx) and noise emissions” [427].
o Hood refers to noise pollution: “Another significant environmental issue in Japan is
noise pollution” [413]
o Horihata et al. also refer to noise pollution : “In regard to running Shinkansens at high
speed, it is necessary to face… a variety of environmental concerns” such as “the
191
environmental problem of noise pollution” [428].
o Soejima, the president of Japan’s Railway Technology Research Institute (RTRI),
writes in a 2003 article that the most significant environment-related research area for
the railway in Japan has been related to reducing noise from the trains. “[N]oise and
vibration are two areas of particular attention in Japan because reducing them ensures
a better environment for trackside residents” [414]. “So far, environmental R&D in
Japan has been aimed at resolving problems of trackside noise and vibrations. In the
future, greater attention will have to be paid to examining noise sources, analyzing
sound transmission paths, and developing better ways to evaluate low-frequency
vibration. But the impact of railways on the global environment also needs examining
from the perspectives of energy conservation, global warming, waste disposal and
recycling” [414].
Anthropogenic noise has negative effects on human and animal health. In humans, “Noise
interferes with complex task performance, modifies social behavior and causes annoyance.
Studies of occupational and environmental noise exposure suggest an association with
hypertension… In both industrial studies and community studies, noise exposure is related to
catecholamine secretion. In children, chronic aircraft noise exposure impairs reading
comprehension and long-term memory and may be associated with raised blood pressure”
[429].
Noise has also been shown to have a negative impact on birds. “Traffic noise is known to have
a negative impact on bird populations” [430]. “Road traffic has negative impacts on the density
of breeding birds in many parts of the world” [431]. “In open landscapes, only noise and visual
stimuli can explain the observed effects” and in forests, only noise can [431]. Noise from
railways may divide habitats for animals adverse to the noise, “contributing to ‘islandification’,
separating communities and often reducing gene flow” [432]. Islandification may have long-
term evolutionary effects on the species.
Competitor Description
The competitor of the nose cone of the 500 Series Shinkansen train is the nose cone of the 300 Series
Shinkansen train, shown below.
The Shinkansen 300 [433].
192
Comparison of Environmental Impact of BID and Competitor
The use stage of Shinkansen trains has been found to overwhelmingly dominate the life cycle
environmental impact of the trains. A life cycle assessment (LCA) study from Miyauchi et al. [434]
comparing the environmental impact of variations of Shinkansen Series 0, Series 100, and Series 300 trains
found that more than 95% of life cycle energy consumption (LCE) and the lifecycle CO2 emissions
(LCCO2) occurs in the use phase of the train. These findings strongly suggest that the use phase of the
Shinkansen 500 series is likely to dominate the environmental impact of the train.
Miyauchi et al. [434] also found that “Given the same conditions (number of stations where the train stops,
and the maximum speed), both LCE and LCCO2 reduce according to the series number (0 series, 100
series, 300 series). This can be considered to be bought about mainly from the effects of improvement such
as lightening the vehicle, use of the regenerative brake, and reduction of running resistance” [434].
Consequently, it is also likely that seemingly minor improvements in the running resistance of the Series
500 due to the modifications inspired by the kingfisher are likely to substantially reduce the environmental
impact, compared to a standard train, over the life of the train.
The bioinspired nose cone is quieter than a nonbioinspired nose cone, and is also likely more aerodynamic.
Consequently, the bioinspired nose cone on the Series 500 Shinkansen will likely have reduced electricity
consumption, compared to a train with a standard pantograph. Both these environmental benefits occur in
the use phase of the train. Additionally, the information above suggests that even minor improvements in
the efficiency of the train in the use phase are likely to substantially affect the environmental impact of the
train as a whole, since the use phase dominates the environmental impact of trains.
193
A.9 SHINKANSEN 500 SERIES PANTOGRAPH
Field
Mechanical Engineering
Biological Analogy
Owls’ serrated primary feathers Environmental Advantage
Reduction in electricity consumption,
Quieter
Company
West Japan Railway Company
Hitachi
N+P Industrial Design
Competitor
Standard pantograph without
serrations
Life Cycle Phase
Use
Biological Analogy Description
Owls are extraordinarily quiet fliers [415] because of their serrated primary feathers [435,436],
shown in the photograph below. These serrated feathers are located on the leading edge of owls’ wings
[436]. These feathers break “down turbulence into smaller currents called micro-turbulences” which
are then absorbed by the soft feathers on the owl [435]. Because noise is a direct result of turbulence
generated during flight, the noise from the owl’s flight is effectively muffled [435,436].
How Owl Feathers Work[435]; Screech owl’s serrated edge of primary feather [437]; Magnified
“[s]errations of the 10th
primary of a barn owl”[436].
Bioinspired Design Description
The 500 Series Shinkansen is an award-winning Japanese train that was “[r]egarded as the fastest electric
train in commercial operation in 1998” [412]. It has a maximum operating speed of 300 km/h, and a
maximum speed of 320 km/hr [413].
However, higher train speeds are associated with higher noise, and “In Japan, noise is said to be the greatest
impediment to raising commercial speeds” of trains [414]. “One of the most important factors to reduce
noise outside the Shinkansen is the system for transferring current to the train. This system consists of a
pantograph and an insulator” [438]. For an electric train, the pantograph is “The mechanism that collects
electricity from the overhead cables” [413]. “The noise created around the pantograph is due to both the
contact between the pantograph itself and the overhead wires, as well as the air friction upon the
194
pantograph and its shields as the train moves at speed” [413]. “[A] large… noise is generated when the air
hits pantographs, the current collectors that receive electricity from the overhead wires” [415].
To address the problem with noise on the pantograph due to air friction, “‘serrations’ were inscribed on
main part of the pantograph, and this succeeded in reducing noise enough to meet the world's strictest
standards. This technology is called a ‘vortex generator’” and is inspired by owls’ serration feathers [415].
Pantograph mechanism of 500 Series Shinkansen based on serration feathers (note the owl picture
in the museum plaque on right) [439,440].
Selection Criteria Verification
#1: The design is truly bioinspired.
Eiji Nakatsu, an active member of the Wild Bird Society of Japan and “the director responsible
for the test runs of the Shinkansen series” recalls: “I had the honor of meeting Mr. Seiichi
Yajima, then an aircraft design engineer and also a member of the Wild Bird Society of Japan.
From him I learned how much of current aircraft technology has been based on studies of the
functions and structures of birds. I learned that the owl family has the most silent fliers of all
birds... It seems that the owl family has acquired the function of "quiet flying" so that prey such
as mice, will receive no warning that the owl is about to strike. Inspired by this fact, we
conducted wind tunnel tests to analyze the noise level coming from a flying owl, using a stuffed
owl courtesy of the Osaka Municipal Tennoji Zoo. We learned that one of the secrets of the owl
family's low-noise flying lies in their wing plumage, which has many small saw-toothed
feathers protruding from the outer rim of their primary feathers… These saw-toothed wave
feathers are called "serration feathers," and generate small vortexes in the air flow that break up
the larger vortexes which produce noise. It took 4 years of strenuous effort by our younger
engineers to practically apply this principle. Finally, "serrations" were inscribed on main part of
the pantograph, and this succeeded in reducing noise enough to meet the world's strictest
standards” [415].
#2: The design is feasible.
The Shinkansen 500 Series has been in operation since 1997 [413,277].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
It is likely that the owl-inspired serrations on the 500 Series pantograph reduce the drag on the
train. A number of journal and book authors imply that this is the case, although none both
195
make this statement directly and describe the bioinspired feature of the pantograph precisely.
In a journal article, Koganezawa et al. [441] discuss how the incorporation of owl-inspired
serrations in transportation vehicles have been shown to decrease drag, implying that this is
likely the case in the 500 Series pantograph as well: “Generally, flow separations due to
vortices cause the increase of drag force.” “In the air-plane industry, ‘vortex generators’ which
have the same mechanism as” serrations on owl feathers “make small vortices and help
boundary layer separation delay downstream” [441]. By delaying boundary layer separation,
these ‘vortex generators’ reduce the drag force on the plane wing. Vortex generators inspired by
owl serrations “are used to reduce drag force and improve mileage of cars” [441]. They also
state: “To reduce running noise of Shinkansen, Japanese bullet train, the vortex generators have
been also applied to its pantograph” [441], implying that the drag reduction seen in both
airplanes and cars would likely be seen in the case of the pantograph as well.
In a book on Shinkansen trains, Hood states: “The noise created around the pantograph is due to
both the contact between the pantograph itself and the overhead wires, as well as the air friction
upon the pantograph and its shields as the train moves at speed” [413]. This means that a
reduction in noise could be caused by a reduction in air friction on the pantograph, and
consequently would reduce the drag on the train. As shown below, the owl-inspired pantograph
causes a reduction in noise, meaning that there is also possibly a reduction in air friction, and
consequently drag force, on the pantograph as a result.
In a book on Bullet Trains, Biello directly states: “The 500 Series also uses an innovative
pantograph design… which helps reduce wind resistance” [424]. Unfortunately, he describes
the pantograph as being "shaped like a wing” [424] which is somewhat incorrect or inexact; the
pantograph is not shaped like a wing, but it has serrations on it shaped like serrations feathers. It
is possible, however, that the author is correct in stating that the bioinspired feature reduces
wind resistance.
Journal articles and books indicate that the 500 Series Shinkansen is quieter as a result of its
bioinspired pantograph.
o Koganezawa et al. [441] explain: “To reduce running noise of Shinkansen, Japanese
bullet train, the vortex generators” inspired by owl serrations “have been also applied
to its pantograph.”
o In addition, Hood’s observations show that the 500 series is quieter than competitors.
He observed while “Standing next to tunnels along the Sanyō Shinkansen,” that
“While the 500-series shinkansen was travelling at 300 km/hr, it was often the 0-series
travelling some 90 km/hr slower that made the most noise” [413].
The noise reduction is likely due to a variety of factors, including the owl feather-inspired
pantograph.
More explicit claims regarding the reduction in noise from the bioinspired pantograph have
been made in gray literature.
o In his interview with Japan for Sustainability, Nakatsu [415] states that “‘serrations’
were inscribed on the main part of the pantograph, and this succeeded in reducing
noise enough to meet the world’s strictest standards” for the 500 Series Shinkansen.
o AskNature’s site for the Shinkansen states that “Engineers were able to reduce the
pantograph’s noise by adding structures to the main part of the pantograph to create
many small vortices… similar to the way an owl’s primary feathers have serrations”
[282].
196
Additionally, the incorporation of serrations has been shown to reduce noise in studies on
airplanes, increasing the likelihood that they could do so on train pantographs.
o Bachmann et al [436] explain: “In aviation, serrations might act as turbulence
generators at the leading edge of the wing. In a series of papers from the early 1970s…
several wind tunnel experiments were performed to investigate the impact of artificial
two-dimensional serrations of different length and spacing in the flow field. In these
studies, serrations influenced the air flow separation, enhanced lift of the wings, and
reduced noise generated by the wings.”
o Koganezawa et al. [441] concur: “In the air-plane industry, ‘vortex generators’ which
have the same mechanism as the serrations” in owls “have been used in terms of…
noise reduction.”
This claim that the reduced noise output by the Shinkansen is an environmental benefit may be
problematic because product noise may not be considered a true or significant environmental
impact. Instead, it may be viewed as a purely aesthetic feature of the product, or as a local and
immediate environmental impact that is not of interest if one is looking at environmental impact
from a global or national perspective. However, as discussed in Chapter 2, noise is considered a
true environmental impact in this analysis. Additionally, number of other reputable sources
describe noise as having a true environmental impact, as were discussed above in the “Selection
Criteria Verification” section for the Shinkansen 500 series nose cone.
Competitor Description
The competing product is a standard 500 series pantograph without the serrations inspired by the owl
feathers. Instead, the competing pantograph would have smooth sides.
Comparison of Environmental Impact of BID and Competitor
The use stage of Shinkansen trains has been found to overwhelmingly dominate the life cycle
environmental impact of the trains. A life cycle assessment (LCA) study from Miyauchi et al. comparing
the environmental impact of variations of Shinkansen Series 0, Series 100, and Series 300 trains found that
more than 95% of life cycle energy consumption (LCE) and the lifecycle CO2 emissions (LCCO2) occurs in
the use phase of the train [434]. These findings strongly suggest that the use phase of the Shinkansen 500
series is likely to dominate the environmental impact of the train.
Miyauchi et al. also found that “Given the same conditions (number of stations where the train stops, and
the maximum speed), both LCE and LCCO2 reduce according to the series number (0 series, 100 series,
300 series). This can be considered to be bought about mainly from the effects of improvement such as
lightening the vehicle, use of the regenerative brake, and reduction of running resistance” [434].
Consequently, it is also likely that seemingly minor improvements in the running resistance of the Series
500 due to the modifications of the pantograph inspired by owl feathers are likely to substantially reduce
the environmental impact.
The bioinspired pantograph is quieter than a nonbioinspired pantograph, and is also likely more
aerodynamic. Consequently, the bioinspired pantograph on the Series 500 Shinkansen will likely have
reduced electricity consumption, compared to a train with a standard pantograph. Both these environmental
benefits occur in the use phase of the train. Additionally, the information above suggests that even minor
improvements in the efficiency of the train in the use phase are likely to substantially affect the
environmental impact of the train as a whole, since the use phase dominates the environmental impact of
trains.
197
Appendix B: Design Library Designs with Insufficient Information
Information on 6 BIDs – Airbus 320, Baleen Water Filters, Passive Walking Bipedal Robots,
Calera Cement, Geckel, and the HotZone Radiant Heater – is presented in Appendix B. The same format
used for the designs in Appendix A was also intended to be used here. However, designs presented in
Appendix B had insufficient information to positively identify them as sustainable BIDs. Information that
was unavailable is not included. Occasionally information from less-reputable sources, or a source citing
information of interest, was included with the hope that someone continuing the work could confirm this
information in more reliable sources or in the original source. Additionally, as these designs were not
selected for analysis, the information contained in these design library entries is more frequently in the
form of relevant quotations from authoritative sources, as opposed to more synthesized material.
198
B.1 AIRBUS 320
Field
Aeronautical Engineering
Biological Analogy
Shark skin riblets Environmental Advantage
Unconfirmed
Company
Airbus Competitor
Standard surface Life Cycle Phase
Use
Biological Analogy Description
“As do many fast-swimming marine organisms, sharks pay a large metabolic cost to overcome the drag on
their body surface. The skin scales of some sharks possess tiny ridges that run parallel to the longitudinal
body axis. The grooved body surface reduces drag through its influence on the boundary layer ” [273].
“Shark skin has a unique microstructure that appears to serve multiple functions for the shark. In the case of
fast-swimming sharks, arguments can be made that the microgeometry associated with the shark skin
reduces drag allowing for higher swimming speeds and increased turning ability on some species. The
majority of the research has involved deducing the turbulent skin-friction drag-reduction capabilities of the
shark skin microgeometry consisting of streamwise riblets, although the separation control mechanisms that
may be present have also been considered. Finally, current biomimetic technological applications of shark
skin microstructure are reviewed, including shark skin swimsuits to anti-fouling surfaces for ocean-going
vessels” [442].
Bioinspired Design Description
“Riblet sheets, modeled on shark skin, reduced the fuel consumption of an Airbus 320 when placed over
the wings and fuselage.” [273]. “Riblets are small surface protrusions aligned with the direction of flow,
which confer an anisotropic roughness to a surface. They are one of the few techniques that have been
successfully applied to the reduction of the skin friction in turbulent boundary layers, both in the laboratory
and in full aerodynamic configurations” [443].
Selection Criteria Verification
#1: The design is truly bioinspired.
#2: The design is feasible.
“Airbus has launched its new "Sharklet" large wingtip devices, specially designed to enhance
the eco-efficiency and payload-range performance of the A320 Family. Offered as a forward-fit
option, Sharklets are expected to result in at least 3.5 percent reduced fuelburn over longer
sectors, corresponding to an annual CO2 reduction of around 700 tonnes per aircraft. The A320
will be the first model fitted with Sharklets, which will be delivered around the end of 2012, to
be followed by the other A320 Family models from 2013. Air New Zealand is the launch
customer for the Sharklets which are specified for its future A320 fleet” [444].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
199
“Riblet sheets, modeled on shark skin, reduced the fuel consumption of an Airbus 320 when
placed over the wings and fuselage” [273].
“Riblets have been used successfully to reduce the overall drag of aerofoils [12] and aircraft
[13] with optimum riblet spacings of the order of 30–70 mm. Szodruch [14] reports on the
flight tests of a commercial aeroplane (Airbus 320) with riblets over 70 per cent of its surface,
and estimates an overall 2 per cent drag reduction, based on the fuel savings obtained. A
summary of those tests, including maintenance and durability issues, can be found in Robert
[15]. The discrepancy between the optimum laboratory performance and full configurations is
probably to be expected from any method based on the reduction of skin friction. Not all the
drag of an aircraft is friction [16], and much of the latter is distributed over three-dimensional or
geometrically complex areas where drag control is difficult to optimize. Note that those
limitations might not apply to configurations that are very different from commercial aircraft,
such as gliders or other high-performance vehicles” [443].
200
B.2 BALEEN WATER FILTERS
Field
Mechanical Engineering
Biological Analogy
Baleen whales (also called
whalebone whales or great
whales)
Environmental Advantage
Unconfirmed
Company
Baleen Filters Pty Limited Competitor
Standard filter Life Cycle Phase
Use
Biological Analogy Description
“[B]aleen whales such as fin whales (Balaenoptera physalus), which gulp-feed as they swim, use and
inward push in front and outward pull on the side (or lower side) to reopen their enormous mouths and
expand their throats. Contraction of the muscles of the conspicuously corrugated throats pushes water and
food through their baleen plates as the mouth closes. So as the whale swims that combination of muscle
contraction followed by pressure-driven expansion pumps the vast volumes of water it needs to process”
[445].
According to the Baleen Filters website: “The word ‘Baleen’ is an anatomical description for the
whalebone that belongs to a group of filter-feeding whales. The baleen is essentially the filter mechanism
that enables the whale to collect plankton, small fish and other marine organisms from the water during
feeding. The combination of a sweeping action of the tongue and the reversing of the water flows as the
whales dive and re-surface during feeding, enable them to capture and strain food, then clean their baleen
prior to the next dive”[446].
Diagram and photo of baleen whale [447].
201
Bioinspired Design Description
“A new dimension in separation technology, a self-cleaning filter, originally patented by the University of
South Australia and critically tested by industry. It is now being sold under the ‘Baleen’ Trademark…The
Baleen Filter technology is an adaptation of this natural technique used by whales to keep their baleen clean
and free from long-term deposits.”[446]. “Baleen Filter technology provides non-pressurised separation to
25 microns without chemical assistance, and to 3 microns with chemical assistance. The Baleen Filter
removes suspended organics, fines, bacterium and sands from wastewater streams”[448]. According to a
patent related to the filter, the goal of the design was “to produce a filtration system which more readily and
continually clears accumulating contaminants from a filter medium during a filtering process” [449].
“The Baleen Filter uses a double act of high pressure, low volume sprays, one which dislodges material
caught by the filter media, whilst the other spray sweeps the material away for collection. This process
removes even the most troublesome of constituents such as grit, suspended and fibrous matter, grease and
oil from water without blocking the filter. As water flows through the filter media, solids initially
suspended in the water are left behind. But before they accumulate to block the screen media the second
spray transports these contaminants away from the filtering zone, enabling the filtering process to continue
without disruption” [448].
Baleen water filter [450,451].
Selection Criteria Verification
#1: The design is truly bioinspired.
According to the Baleen website: “The baleen is essentially the filter mechanism that enables
the whale to collect plankton, small fish and other marine organisms from the water during
feeding. The combination of a sweeping action of the tongue and the reversing of the water
flows as the whales dive and re-surface during feeding, enable them to capture and strain food,
then clean their baleen prior to the next dive. The Baleen Filter technology is an adaptation of
this natural technique used by whales to keep their baleen clean and free from long-term
deposits.”[446].
#2: The design is feasible.
According to the Baleen Filters website: “The Baleen Filter can be ordered directly from us or
via one of our representatives. You can purchase an appropriate unit or lease one from us”
[452].
202
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
According to one of Baleen’s European patents: “This invention relates to an improved form of
filter, and in particular to a filter having a novel means of clearing contaminants from the
upstream or filtration side of the filter to thereby increase filtering efficiency”[453]. However, it
is unclear that this additional filtering efficiency is a direct result of the bioinspired feature.
Additionally, the Baleen Filters website (a non-peer-reviewed source) provides a list of the
major benefits of the filters for industry. This list includes a number of claimed environmental
benefits, including: “Small footprint - saving valuable land;” “Environmentally friendly,
reduced or no chemicals required;” “Low operating costs, low energy needs and low
maintenance;” and “Simplicity in industrial wastewater management” [448]. It is possible that
some or all of these claims are valid and could be confirmed in peer-reviewed sources.
However, claims made on the Baleen website are not considered sufficient for the purposes of
this analysis.
Conclusion: Evidence that the Baleen filter meets criterion #3 as a result of its bioinspired feature
is likely to be found in peer-reviewed sources but is still required.
Competitor Description
The competing product is a standard filtration system discussed in the Baleen patent. In a standard
filtration system, the particles being filtered out of the fluid are captured in a way that obstructs the fluid
flow and eventually requires cleaning of the filtration device [449]. “Typical cleaning processes include:
periodic back flushing where the direction of fluid flow through the filter medium is reversed; and
mechanical scraping where a scraper traverses the surface of the filter medium to remove contaminants
thereby exposing the filter medium to damage. These cleaning processes interrupt the filtering process and
therefore introduce inefficiencies. Furthermore, in some applications it is impractical to clean the filter
medium frequently enough to prevent build up of contaminant on the filter medium surface using those
cleaning processes and therefore poor filtration efficiencies result. While there exist numerous types of self-
cleaning filters their limitations include: the types of fluids that they are able to filter, their durability, the
flow rates achievable and the operational time of the filtration process before shutdown is required” [449].
203
B.3 PASSIVE WALKING BIPEDAL ROBOT
Field
Robotics
Biological Analogy
Human walking Environmental Advantage
Passive (energy efficient) walking
Company
University researchers Competitor
Actively-controlled walking
robot, Honda Asimo
Life Cycle Phase
Use
Biological Analogy Description
Humans walk efficiently on two legs without high-power or high-frequency actuation [311]. While
walking, humans push off with their ankles and have “powered leg swinging” [311]. Whittington et al.
[316] showed experimentally that the stretching of soft tissues in the hips and ankles of humans creates
passive moments, allowing for energy absorption while the leg swings, accounting for up to “35% of the
net hip flexor moment” and approximately 15% of net plantarflexor work.
Bioinspired Design Description
“In contrast to mainstream robots, which actively control every joint angle at all times, passive-dynamic
walkers do not control any joint angle at any time” [311]. “Passive-dynamic walkers are simple mechanical
devices, composed of solid parts connected by joints, that walk stably down a slope. They have no motors
or controllers, yet can have remarkably humanlike motions… Here we present three robots based on
passive-dynamics, with small active power sources substituted for gravity, which can walk on level ground.
These robots use less control and less energy than other powered robots, yet walk more naturally, further
suggesting the importance of passive-dynamics in human locomotion” [311].
“Three level-ground powered walking robots based on the ramp-walking designs… (A) The Cornell
biped. (B) The Delft biped. (C) The MIT learning biped” [311].
204
Selection Criteria Verification
#1: The design is truly bioinspired.
“Each of the robots here has some design features that are intended to mimic humans. The
Cornell and Delft bipeds use anthropomorphic geometry and mass distributions in their legs and
demonstrate ankle push-off and powered leg swinging, both present in human walking (14, 19).
They do not use high-power or high-frequency actuation, which are also unavailable to humans.
These robots walk with humanlike efficiency and humanlike motions (Fig. 4 and movies S1 to
S3). The motor learning system on the MIT biped uses a learning rule that is biologically
plausible at the neural level (20). The learning problem is formulated as a stochastic optimal
feedback control problem; there is emerging evidence that this formulation can also describe
biological motor learning (21)” [311].
“A common misconception has been that gravity power is essential to passive-dynamic
walking, making it irrelevant to understanding human walking. The machines presented here
demonstrate that there is nothing special about gravity as a power source; we achieve successful
walking using small amounts of power added by ankle or hip actuation. We expect that
humanoid robots will be improved by further developing control of passive-dynamics–based
robots and by paying closer attention to energy efficiency and natural dynamics in joint-
controlled robots (26). Whatever the future of humanoid robots, the success of human mimicry
demonstrated here suggests the importance of passive-dynamic concepts in understanding
human walking” [311].
#2: The design is feasible.
Numerous fully-functional prototypes exist. See photos above.
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
“These robots use less control and less energy than other powered robots, yet walk more
naturally” [311].
In general: “Traditional direct drive actuation system of robotic manipulators is probably one of
the easiest ways to actuate robotic walkers, due to its simplicity in mechanical implementation
and the fact that the rotational motion of motors is directly mapped into rotational motion of the
joints. Consequently, if we just require an appropriate functionality of a robotic walker, the
direct drives with a gear set would be a convenient solution. However, biological walkers that
use an inverted pendulum like mechanism [1, 2, 3] are considered energy efficient relatively
with respect to the state of the art robotic walkers [12, 13], using a different kind of actuators,
the muscles, which can be considered as elastic (stretchable) linear actuators. Energy efficiency
and the level of walk cycle precision and smoothness are among important reasons for
mimicking biological walkers” [312].
Competitor Description
The competitor is the Honda Asimo, an actively-controlled walking robot with motors and actuators
controlling all aspects of the walking motion.
Comparison of Environmental Impact of BID and Competitor
“To compare efficiency between humans and robots of different sizes, it is convenient to use the
dimensionless specific cost of transport, ct 0 (energy used)/(weight _ distance traveled). In order to isolate
205
the effectiveness of the mechanical design and controller from the actuator efficiency, we distinguish
between the specific energetic cost of transport, cet, and the specific mechanical cost of transport, cmt.
Whereas cet uses the total energy consumed by the system (11 W for the Cornell biped), cmt only considers
the positive mechanical work of the actuators (3 W for the Cornell biped). The 13-kg Cornell biped
walking at 0.4 m/s has cet , 0.2 and cmt , 0.055. Humans are similarly energy effective, walking with cet ,
0.2, as estimated by the volume of oxygen they consume (VO2), and cmt , 0.05 (12–14). Measurement of
actuator work on the Delft biped yields cmt , 0.08. Based on the small slopes that it descends when passive,
we estimate the MIT biped to have cmt Q 0.02. Although the MIT and Delft bipeds were not specifically
designed for low-energy use, both inherit energetic features from the passive-dynamic walkers on which
they are based. By contrast, we estimate the state-of-the-art Honda humanoid Asimo to have cet , 3.2 and
cmt , 1.6 (15). Thus Asimo, perhaps representative of joint-angle controlled robots, uses at least 10 times
the energy (scaled) of a typical human” [311].
“The Cornell biped is specifically designed for minimal energy use. The primary energy losses for humans
and robots walking at a constant speed are due to dissipation when a foot hits the ground and to active
braking by the actuators (negative work). The Cornell design demonstrates that it is possible to completely
avoid this negative actuator work. The only work done by the actuators is positive: The left ankle actively
extends when triggered by the right foot hitting the ground, and vice versa. The hip joint is not powered,
and the knee joints only have latches. The average mechanical power (10) of the two ankle joints is about 3
W, almost identical to the scaled gravitational power consumed by the passive-dynamic machine on which
it is based (8). Including electronics, microcontroller, and actuators, the Cornell biped consumes 11 W
(11)” [311].
Conclusion: Passive walking bipedal robots appear to meet all three criteria for selection. However,
too much of the information comes from one source alone. More information from other sources
should be included.
206
B.4 CALERA CEMENT
Field
Process Engineering
Biological Analogy
Growth of reef coral Environmental Advantage
Sequesters carbon
Company
Calera Corporation Competitor
Portland cement Life Cycle Phase
Use
Biological Analogy Description
“Ocean chemistry involves the gradual absorption and mineralization of carbon. Over geologic time, vast
amounts of CO2 are naturally absorbed into the oceans and converted into stable minerals, such as
limestone” [454]. “Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO3) in
the form of the mineral calcite… Most limestones form in shallow, calm, warm marine waters. That type of
environment is where organisms capable of forming calcium carbonate shells and skeletons can easily
extract the needed ingredients from ocean water. When these animals die their shell and skeletal debris
accumulate as a sediment that might be lithified into limestone. Their waste products can also contribute to
the sediment mass. Limestones formed from this type of sediment are biological sedimentary rocks. Their
biological origin is often revealed in the rock by the presence of fossils” [455]. If calcium carbonate
(CaCO3) “is heated to a high temperature in a kiln the products will be a release of carbon dioxide gas
(CO2) and calcium oxide (CaO)” [455].
“[M]arine cement…is produced by coral when making their shells and reefs, taking calcium and
magnesium in seawater and using it to form carbonates at normal temperatures and pressures” [203].
According to Constantz: “Stony corals calcify by nucleation and growth of aragonite fibers on seed nuclei
packets produced by the coral. Aragonite fibers arrange into polycrystalline bundles that lift the coral
upward during fiber growth, entrapping fibrils and tissue sheets, from the undersurface of the calicoblastic
epithelium, between growing crystals. The morphology and arrangement of the aragonite fibers are
controlled by inorganic kinetic factors of crystal growth, akin to inorganically precipitated marine cements.
Corals selectively plane- off extending fibers on completed structures and stop fiber growth. Similar
skeletal construction and maintenance mechanisms are found in other phyla” [456].
Reef coral [285].
207
Bioinspired Design Description
Calera has developed a cement-making process inspired by the mechanisms underlying growth of reef coral
[285]. Calera cement “would capture and store carbon dioxide similarly to how coral absorb calcium and
magnesium to build their shells” [457]. In the Calera process, “CO2 is mineralized in an aqueous
precipitation process. CO2 reacts with calcium or magnesium in e.g. brines resulting in carbonates with can
be used as a building material. Calera supposedly exhibits a CO2 capture efficiency of 70-90% with a good
input conversion. It remains open to what degree these carbonates as the final product show cementitious
properties” [458]. “The heart of the Calera process is the formation of novel, metastable calcium and
magnesium carbonate and bicarbonate minerals, similar to those found in the skeletons of marine animals
and plants, by capturing carbon dioxide from flue gas and converting the gas to stable solid minerals. These
novel 'polymorphs' make it possible to produce high reactive cements without calcining the carbonate as is
the case with conventional portland cement” [459].
Conversion of Carbon Dioxide to Carbonates [460].
Selection Criteria Verification
#1: The design is truly bioinspired.
“[I]n 1984, when Brent Constantz was a graduate student at the University of California at
Santa Cruz” he studied “coral growth mechanisms in the Caribbean and the Indo-Pacific, as
well as the deep sea and temperate latitudes. His insights about the physiochemically-dominated
skeletogentic mechanism of reef coral led” him to become “interested in co-opting coral growth
mechanisms for creating large structures in tropical oceans out of ‘mother-of-pearl’ or synthetic
limestone. His vision was that these mechanisms would be lifted out of the sea in modules and
assembled into massive structures in the built environment, like buildings and bridges…
Constantz contacted Khosla in 2007 with his idea about a new ‘green cement’ to replace the
carbon-intensive Portland cement, the third largest source of anthropogenic carbon dioxide.
Khosla saw the value of the idea immediately and funded Calera... Within a few months,
Constantz had assembled a team that was making carbonate cements from seawater, hauled
208
over from Santa Cruz to their facility in Los Gatos in a water trailer. In October 2007, while
Khosla was visiting the Los Gatos laboratory, the team noted that lack of carbon dioxide in the
seawater was limiting the reaction, and there was a need for more carbon dioxide. An
experiment was in progress, bubbling carbon dioxide through the seawater, and it was noted
that the yield increased eight-fold. Constantz turned to Khosla and asked, ‘Where can we get
large quantities of carbon dioxide?’ ” [285].
“Natural chemical processes in the world’s oceans inspire the Calera's technology. For
millennia these processes have helped to balance the world’s carbon cycle and created massive
formations of carbonate deposits, such as the white cliffs of Dover” [454].
#2: The design is feasible.
“Calera’s technology may be suitable for a variety of facilities, including both retrofits and new
plants. We have successfully retrofitted our technology at the demonstration level to an existing
gas plant in Moss Landing, California” [454].
“Calera has conducted multi-pollutant testing with the process operated on flue gas from a wide
variety of coals in the pilot scale plant” [461].
“We have demonstrated the continuous operation at laboratory scale and have constructed a 1-
ton per day pilot scale system at our facility in Moss Landing” [462].
Currently, a demonstration plant exists at Moss Landing, CA, which uses flue gas from
Dynegy’s Moss Landing natural gas facility [463]. According to Calera, the demonstration unit
has been shown to capture 86% of the CO2 from the incoming flue gas, and similar capture
percentages were also achieved from their “pilot size coal combustion test unit” [464].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
Calera cement, manufactured using flue gas from power plants, has potential to provide an
environmentally sustainable alternative to standard types of cement and standard carbon capture
and sequestration methods [465] because it sequesters CO2 from the flue gas and uses it to
create valuable building materials [466].
“Calera cement can potentially greatly reduce carbon dioxide emissions” [457].
Competitor Description
“Cement is the most widely used building material, having a variety of applications in construction. It is
characterized as a finely crushed, inorganic powder” [457]. “Calera cement can be used as a replacement
for Portland cement” [203]. “The process for creating the most widely used cement, portland cement, is an
energy intensive process, which consumes considerable natural resources, such as limestone. In addition,
portland cement production releases harmful air pollutants, detrimental to human respiratory health, and
also emits significant quantities of carbon dioxide” [457]. Sun et al. [457] detail the production process of
Portland cement - from raw material processing, to clinker formation, to the crushing of clinker with
additives to form Portland cement - and discuss related energy consumption and environmental impacts in
each step.
209
White Portland Cement [467], and Portland Cement [468].
Comparison of Environmental Impact of BID and Competitor
The production of cement has a large negative environmental impact.
“Cement, which is mostly commonly composed of calcium silicates, requires heating limestone
and other ingredients to 2,640 degrees F (1,450 degrees C) by burning fossil fuels… Making one
ton of cement results in the emission of roughly one ton of CO2- and in some cases much more”
[203].
“Cement production emits a wide range of air pollutants (including nitrogen oxides, sulfur
dioxides, and particulate matter (PM)) that affect human health (Marlowe and Mansfield 2002).
Trace and toxic releases of hydrochloric acid, sulfuric acid, ammonia, heavy metals, and organic
compounds are known to occur during cement production (US EPA 2006). Furthermore, cement
production contributes to at least 5% of the global carbon dioxide emissions (Azios 2008)” [457].
Calera cement uses abundant materials, consumes pollutants, and generates valuable resources.
“Nor are there any limitations on the raw materials of the Calera cement: Seawater containing
billions of tons of calcium and magnesium covers 70 percent of the planet and the 2,775 power
plants in the U.S. alone pumped out 2.5 billion metric tons of CO2 in 2006. The process results in
seawater that is stripped of calcium and magnesium—ideal for desalinization technologies—but
safe to be dumped back into the ocean. And attaching the Calera process to the nation's more than
600 coal-fired power plants or even steel mills and other industrial sources is even more attractive
as burning coal results in flue gas with as much as 150,000 parts per million of CO2” [203].
“The heart of the Calera process is the formation of novel, metastable calcium and magnesium
carbonate and bicarbonate minerals, similar to those found in the skeletons of marine animals and
plants, by capturing carbon dioxide from flue gas and converting the gas to stable solid minerals.
These novel 'polymorphs' make it possible to produce high reactive cements without calcining the
carbonate as is the case with conventional portland cement.
“Akin to portland cement and aggregate which derive from mining operations in quarries and
subsequent processing, the precise stoichiometry of Calera's cements will vary somewhat by site
and will include other trace/minor components. In particular, many trace components will be
captured from the flue gas such as sulfur oxides and mercury and will be incorporated into the
solid phase as insoluble sulfates and carbonates. After removal from the water and appropriate
processing, the solids have value in a number of construction applications” [459].
“Calera supposedly exhibits a CO2 capture efficiency of 70-90% with a good input conversion. It
remains open to what degree these carbonates as the final product show cementitious properties.
The inventors claim the product to be carbon negative” [458].
210
Conclusion: A number of recent papers still refer to Calera cement in terms of investors’ beliefs, how
much CO2 the cement “would capture” [457], and what impact there will be for Calera “if
successful” [469], indicating Calera has not proven, at least publicly, that its process is effective and
environmentally-beneficial. Additionally, the FAQ section of Calera’s website has questions such as
“When can we expect to see an actual Calera cement?” and “What is the carbon footprint of your
product?” [464]; Calera’s responses to these questions are vague. The carbon footprint question is
answered with the statement, “The ultimate goal is to produce products that are carbon negative,
and as we scale up and refine our technology, that remains at the forefront,” [464] meaning the
design has not been finalized and it is not clear what the true environmental impact of this cement
will be.
211
B.5 GECKEL
Field
Materials Science
Biological Analogy
Geckos and mussels Environmental Advantage
May not exist
Company
Northwestern University Competitor
Uncertain Life Cycle Phase
None known
Biological Analogy Description
Geckos and mussels have very different strategies for successfully attaching to objects in their
environment. Geckos have the ability to rapidly stick to and detach from surfaces while they are moving
[470,471], using hairlike attachment devices called setae [470,472]. Setae have a branching structure that
ends with very thin foot hairs [294] on the order of 200 nm at the end of the branch [470]. Because of the
adhesive properties of setae, geckos are able to stick to smooth surfaces [270,298] and walk up vertical
surfaces and across ceilings [270,470-472]. However, geckos are unable to stick to wet surfaces [471].
In contrast, mussels are able to attach to surfaces underwater and are able to attach to almost any surface
[21], “including classically adhesion-resistant materials” [473]. Additionally, surface adhesion in mussels
occurs on a much longer time scale than geckos. Adhesion in muscles is intended to anchor the muscle in
the intertidal zone so that it does not get washed out to sea or brought too far inland and broken on rocks
[471]. This ‘anchor,’ called a byssus [21,474], is formed from a chemical glue secreted by the muscle
surfaces [471,472].
Gecko Foot [475], and Mussel Adhesion [471].
Bioinspired Design Description
Geckel is a nanoadhesive inspired by both the dry adhesive properties of geckos and the wet adhesive
properties of mussels [298,470]. It is comprised of essentially “arrays of gecko-mimetic nanoscale pillars
coated with a thin mussel-mimetic polymer film” [470]. A diagram of the fabrication process of geckel is
shown in the figure below. Geckel can be used for a wide range of applications that require wet or dry
temporary adhesives [470,476], such as securing “two wet sides of a cut tissue” in medicine [298].
Additionally, the attachment of geckel adhesive is reversible; after over 1000 cycles of contact and
separation [298,470], there is only a 15% reduction in adhesion strength in water and a 2% reduction in air
[472].
212
[470]
Selection Criteria Verification
#1: The design is truly bioinspired.
A paper in Nature from Lee et al. explains the development of geckel: “We refer to the
resulting flexible organic nanoadhesive as ‘geckel’, reflecting the inspiration from both gecko
and mussel” [470].
In a patent for geckel, Messersmith et al. state: “The present invention provides a unique
‘mimetic’ functional combination of the two unique natural adhesion mechanisms inspired by
geckos and mussels” [472].
Messersmith et al. also state: “Described herein is a new class of hybrid biologically-inspired
adhesives comprising an array of nanofabricated polymer columnar pillars coated with a thin
layer of a synthetic polymer that mimics the wet adhesive proteins found in mussel holdfasts…
This hybrid adhesive, which combines the salient design elements of both gecko and mussel
adhesives, provides a useful reversible attachment means for a variety of surfaces in many
environments” [472].
#2: The design is feasible.
A prototype of geckel exists and the fabrication method is discussed thoroughly in Lee et al.
[470]. While it is likely the manufacturing process would change substantially during large-
scale manufacturing, the environmental impact in the other life cycle phases is likely to remain
the same as is displayed in this prototype of geckel.
213
However, the authors refer to potential future improvements to the functionality of geckel:
“Further refinement of the pillar geometry and spacing, the pillar material, and mussel-mimetic
polymer may lead to even greater improvements in performance of this nanostructured
adhesive” [470]. This suggests that the current prototype may not qualify as ‘fully functional’.
The Messersmith Research Group’s website for geckel states: “Our next step is to scale up the
geckel adhesive for mass production, optimize the pillar geometry, and engineer mussel-
mimetic polymers. We believe geckel adhesives will be used in many applications such as
medical, industrial, and military settings in the future” [474].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
No information was found indicating a reduced environmental impact as a result of BID for
Geckel.
Comparison of Environmental Impact of BID and Competitor
The manufacturing of Geckel is explained below.
“E-beam lithography (eBL) was used to create an array of holes in a polymethyl methacrylate
(PMMA) thin film supported on Silicon (Si) (PMMA/Si master). Casting of
poly(dimethylsiloxane) (PDMS) onto the master followed by curing and lift-off resulted in gecko-
mimetic nanopillar arrays. Finally, a mussel adhesive protein mimetic polymer is coated onto the
fabricated nanopillars. The topmost organic layer contains catechols, a key component of wet
adhesive proteins found in mussel holdfasts” [472].
The purpose of geckel is not to be more sustainable, but to provide a new function – allowing glues to
adhere under water.
Messersmith says in an interview: “adhesion in a wet environment is very difficult to achieve. The
simple fact that a mussel can attach to a wet surface that’s submerged underwater during adhesion
is actually quite remarkable. There are very few man-made adhesives that work well under those
conditions” [471].
The improved functionality of Geckel is also emphasized elsewhere: “Repetitive AFM
measurements showed that geckel adhesive’s wet- and dry-adhesion power was only slightly
diminished during many cycles of adhesion, maintaining 85% in wet (red) and 98% in dry (black)
conditions after 1100 contact cycles (FIG.5). To our knowledge no other gecko-mimetic adhesive
has demonstrated efficacy for more than a few contact cycles,2,8
and none have been shown to
work under water” [472].
Conclusion: To be considered for analysis, sources indicating that Geckel has an environmental
advantage as a result of its bioinspired feature would need to be identified.
214
B.6 HOTZONE RADIANT HEATER
Field
Mechanical Engineering
Biological Analogy
Lobster eyes Environmental Advantage
Unconfirmed
Company
Radiant Optics Competitor
Standard radiant heater Life Cycle Phase
Use
Biological Analogy Description
Lobster eyes, and the eyes of other long-bodied crustaceans of the suborder Macrura, have multiple
radially-oriented square lenses [477-479], as can be seen in the figure below of the shrimp eye. These
lenses act as mirrors and focus the light on “one or more photoreceptors” [298] so that the intensity of the
light in the deep sea environment is amplified [298,477,479]. As a result of these box mirrors, “the eyes of
shrimp and lobsters enjoy more than 250 times the light-catching power of the human eye” [479].
Shrimp eye [479], and Caribbean spiny lobster [480].
Bioinspired Design Description
The HotZone radiant heater is an infrared spot heater that imitates the mirrored lenses found in the lobster
eye to focus heat on a particular point, or to disburse it over a specified area. A patent for the radiant lenses
describes the design in detail:
“[W]hen the face of the unit is disposed out of the plane…then the radiation undergoes a
dispersing effect in the sense that the outgoing rays or lines of reflected radiation tend to diverge
from the axis which intersects the face of the unit…Conversely, when the face of the unit is
disposed below the focal plane… then the radiation undergoes a condensing effect in the sense
that the outgoing rays or lines of reflected radiation tend to converge on the axis in question…
Accordingly, by varying the location of the radiation face of the unit with respect to the focal
plane of the panel, it is possible to vary the extent to which each unit of radiation undergoes
superposition, that is, the extent to which each unit of radiation is imaged or “stacked” in the area
to be heated, together with other units of radiation from the face of the radiation unit. This in turn,
enables the designer to irradiate a specified work space in more or less intensified form than than
the radiation source itself would provide by direct transmission to that space. For example, given a
particular BTU per square foot rating… and a particular area… to be irradiated, the designer can
215
determine not only the best shape and size for the panel, but also the spatial relationship between
the panel and the face of the unit which will provide the best level of heat in the space to be
heated. Furthermore, since the designer is able to concentrate more heat within the space in
question than was possible with a conventional heater having the same BTU per square foot
rating, he can space the heater further above the work space to generate a ‘sun effect’ and
eliminate the discomfort to personnel which occurs when the heater is disposed so close that they
experience ‘swings’ in temperature as they move in an out of its image.
“A similar but opposite effect occurs in the eyes of crustaceans of the suborder Macrura, such as
shrimp, crayfish and lobsters. They have compound mirror lens at the outer peripheries of their
eyes.... They operate to ‘stack’ incoming light at points on the retina of the eyes of the crustaceans,
so that the dim light which is commonly available to them in their natural habitat, is intensified for
the purpose of their vision. Of course, the panel 10 uses this superposition effect to focus points of
radiation on an area below the panel, whereas the lens of the eye of the crustacean uses it to
intensify incoming light on the retina of the eye. However, in other applications of the invention,
the panel 10 can be used to intensify bands of incoming light on points similar to the radiation
points” [477].
Diagrams and photograph of the HotZone Radiant Heater [481,482].
Selection Criteria Verification
#1: The design is truly bioinspired.
“Radiant Optics was founded in 1985… by inventor/entrepreneur Roger Johnson to capitalize
on his lobster-eye inspired compound reflective lens that uniquely focuses and directs infrared
energy… Johnson and his team developed and marketed a complete line of gas, then electric
heaters, fitted with the patented IRLensTM
to allow customers and partners to develop and
implement highly energy efficient spot heating and thermal comfort solutions. Over the years,
tens of thousands of HotZoneTM
heaters have been sold… In 2008, Johnson exclusively
licensed the assets of Radiant Optics to Schaefer Ventilation of Sauk Rapids, MN” [483].
The Schaefer Ventilation Equipment website reads: “Welcome to the home of the HotZone®
heater and the lobster eye-inspired IRLensTM” [484].
#2: The design is feasible.
“Over the years, tens of thousands of HotZoneTM
heaters have been sold into factories,
warehouses, arenas, stores and residences” [483].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
No explicit claims regarding a reduced environmental impact of the heater were found during research
on this design. However, the HotZone website (not peer-reviewed) does have a statement claiming an
216
environmental benefit of the heater. The HotZone website states:
[T]he patented lobster-eye IRLensTM… focuses three to five times more infrared energy into
the center of the beam than heaters without lenses. This revolutionary design makes HotZone®
the most energy-efficient infrared heater on the market… The revolutionary design of the
IRLensTM captures the majority of the infrared wasted by ALL other heaters on the market and
FOCUSES it on a targeted area or zone… As a result, the HotZone® can:
Increase delivered heat by 300-500%...
Reduce total heating costs by 50% or more.
Doesn’t heat areas that don’t need it. [484]
Additionally, a HotZone-related patent discusses how the performance of the reflectors is substantially
reduced when they are hot: “For example, increasing the metal temperature of aluminum from 100 deg. F
to 500 deg. F. may increase its absorption of certain wavelengths of radiant energy by up to a factor of
about three to five” [481]. The patent goes on to discuss ways to reduce the temperature of the reflectors by
“providing cooling air behind the reflector,” or:
by increasing the ability of the reflector surface that is exposed to the radiant energy to provide
energy radiantly. In one example, this includes tailoring or modifying the reflector material’s
emissivity to enhance reflection on the reflective (e.g., toward the radiant surface) or to enhance
radiation from the reflector’s backside better (e.g., away from the radiant heater element’s
surface). This may also be accomplished by designing the geometry of one or more of the
reflectors [481].
It seems likely that changing the geometry of the reflectors, as mentioned in the last sentence, is the
approach taken by HotZone and explains why the website claims the 300-500% increase in heat delivery
with the associated reduction in heating costs.
Competitor Description
The competitor in this case is a standard radiant heater without the boxy bioinspired lenses.
Comparison of Environmental Impact of BID and Competitor
A HotZone-related patent argues that standard radiant heaters are not as efficient as claimed:
Radiant heaters convert gas, electric, or other non-radiant energy… into radiant energy. Other
resulting non-radiant energy output (such as convective) diminishes heater efficiency. Other heater
byproducts may contribute to air pollution. Existing radiant heaters have typically emphasized the
primary radiant energy output. More particularly, they have typically disregarded the energy
wasted by flue product gas… and by other convective gas flow... Electric radiant heater products
typically claim to be 100% efficient on the grounds that all the input electricity is converted into
some sort of heat. Gas radiant heater products (such as tube heaters, for example) typically claim
very high efficiency on the grounds that the wasted flue product includes low unburned chemical
energy. However, existing radiant heaters unnecessarily waste and amount of radiant energy equal
to the convective heat gain in the ambient and/or flue products [481].
Conclusion: Although there may be reason to believe an environmental benefit exists as a result of
the bioinspired feature, a peer-reviewed source is needed to confirm these suspected environmental
benefits.
217
Appendix C: Design Library Designs Eliminated Using 3 Criteria
Information on 3 BIDs – Crystal Palace in London, the Eiffel Tower, and Velcro – is presented in
Appendix C. The same format used for the designs in Appendix A was also intended to be used here.
However, designs presented in Appendix C had were eliminated using at least one of the three criteria.
Hence, a full analysis was not deemed necessary, and some sections are left blank.
218
C.1 CRYSTAL PALACE IN LONDON
Field
Architecture
Biological Analogy
Uncertain – Possibly the Giant
Water Lily
Environmental Advantage
May not exist
Biological Analogy Description
The Giant Water Lily [485,486].
DESIGN DESCRIPTION
The Crystal Palace [487,488].
Selection Criteria Verification
#1: The design is truly bioinspired.
There are no firsthand accounts from Paxton, the designer of the Crystal Palace, indicating that his
design was bioinspired. In addition, secondhand accounts are in disagreement on this issue, as is shown
below.
Phillip Ball, in his 2001 article in Nature, states that Paxton’s design for the Crystal Palace was
inspired by “the ribbed stem of a lily leaf” [68]. Ball does not provide a citation for this
statement.
Ask Nature, a project of the Biomimicry Institute, has a website that agrees with Ball. It states
that Paxton “mimicked the ribs and struts of the giant water-lily to provided the support
needed” for the Crystal Palace [489]. This website does not contain a citation for this statement.
219
However, another AskNature site explains the inspiring strategy behind the Crystal Palace and
provides a quotation from Attenborough explaining Paxton’s process of bioinspiration [490].
Attenborough states that Paxton was both a gardener and an architect. He received one of the
first seedlings from the Amazon water-lily to reach Europe when he was running the Duke of
Devonshire’s gardens in the mid-19th
century [491]. Paxton “built one of the first big
glasshouses. When he came to design the cast-iron supports for his hithero unprecedented
expanse of glass, he remembered the ribs and struts of his giant water-lily that supported
gigantic leaves and used them as the basis of his designs not only for the glass-houses at
Chatsworth but also, a few years later, for his architectural masterpiece, the Crystal Palace in
London”[491]. As is typical of most books, Attenborough does not provide a reference to the
primary source of this information.
Vogel, on the contrary, uses the example of the Crystal Palace as one which shows how the idea
of bioinspiration romanticized a design, even when the design was not truly bioinspired [116]. Vogel finds a speech from Paxton speaking of how a greenhouse he designed before the Crystal
Palace was inspired by a leaf, but concludes that there is no evidence that the Crystal Palace
was inspired by the giant water lily [116].
Julian Vincent et al. cite Vogel’s analysis when discussing bioinspired systems which “may be
apocryphal in their derivation, have the status of urban myth, or be the product of over-
enthusiasm” [11].
#2: The design is feasible.
The Crystal Palace was constructed “in 1851 for the Great Exhibition held in London’s Hyde
Park” [487].
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
There is no evidence of peer-reviewed documentation indicating that the potentially bioinspired
features of the Crystal Palace are environmentally beneficial.
Conclusion: The Crystal Palace meets neither criterion #1 nor #3.
220
C.2 EIFFEL TOWER
Field
Architecture
Biological Analogy
Uncertain – Possibly bone
structure, trabecular struts in the
head of a human femur, or the
taper of a tulip stem
Environmental Advantage
May not exist
Biological Analogy Description
Tulip Stem [492]. Head of human femur [493].
DESIGN DESCRIPTION
Eiffel Tower [494].
Selection Criteria Verification
#1: The design is truly bioinspired.
There are no firsthand accounts from Eiffel, the designer of the Eiffel Tower, indicating that his design
was bioinspired. In addition, secondhand accounts are in disagreement on this issue. Philip Ball, in a
2001 article in Nature, states that the Eiffel Tower was inspired by bone structure [68]. Ball does not
provide a citation for this statement. Julian Vincent et al., in a 2006 article in Journal of the Royal
Society Interface, state that there are myths that the Eiffel Tower was inspired by the human femur or a
221
tulip stem, but that it was actually just designed to resist wind loading [11]. Vincent et al. also do not
provide a citation for their statement. It is easy to see how two contradicting statements in white
literature, which propagate through the literature through citations, may cause confusion. Ball’s
statement, for instance, has been cited by Reap et al. in a 2005 IMECE article [28].
#2: The design is feasible.
The Eiffel Tower was constructed in 1889 for the World’s Fair.
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
There is no evidence of peer-reviewed documentation indicating that the potentially bioinspired features
of the Eiffel Tower are environmentally beneficial.
Conclusion: The Eiffel Tower meets neither criterion #1 nor #3.
222
C.3 VELCRO
Field
Mechanical Engineering
Biological Analogy
Cockleburs Environmental Advantage
May not exist
Company
Velcro, Inc. Competitor
Buttons, zippers, shoelaces Life Cycle Phase
None
Biological Analogy Description
Cockleburs disperse the seeds of plants. Because of their hooked structure that mechanically interlocks
upon contact with fur or cloth, for example, burs are easily able to detach from their plant and attach to
passers-by [495]. This hooked structure is visible in the magnified view below.
Cockleburs [496,497], and magnified hooks on fruit of C. lutetiana [495].
Bioinspired Design Description
Velcro is widely used as a fastener; it is a “separable fastening device comprised of two elements” – one
with loops, and the other with hooks that hold their shape [498]. “[W]hen two layers of this type are
pressed into face to face relation a substantial percentage of hooks engage with one another, and the two
layers are thus hooked one to the other. Separation requires a force of considerable magnitude when it is
attempted to release a large number of hooks at once but separation may be quite readily effected by
progressively peeling the layers apart” [498]. One of the first Velcro-related patents in the US states that
Velcro is “adapted to be used… as closing devices for clothing, blinds or the like” [498]. Some other
applications for Velcro include: shoes, roller skates, memo boards, coats, gloves, costumes, watches,
Velcro walls, knee braces, and products for use in space.
223
Velcro [499,500].
Selection Criteria Verification
#1: The design is truly bioinspired.
Velcro USA’s website tells the story of the bioinspiration for Velcro: “In the early 1940's,
Swiss inventor George de Mestral went on a walk with his dog... Upon his return home, he
noticed that his dog's coat and his pants were covered with cockleburrs. His inventor's curiosity
led him to study the burrs under a microscope, where he discovered their natural hook-like
shape. This was to become the basis for a unique, two-sided fastener - one side with stiff
"hooks" like the burrs and the other side with the soft "loops" like the fabric of his pants. The
result was VELCRO® brand hook and loop fasteners” [232].
#2: The design is feasible.
Velcro is a widely-available commercial product.
#3: The design has a reduced environmental impact as a result of its bioinspired feature.
Velcro is a very general fastening product with a wide range of applications. When compared to
other temporary attachment devices – such as buttons, zippers, strings, and tape – there is no.
logical or fundamental reason why Velcro would offer an environmental advantage as a result
of its bioinspired features. There is no evidence in peer-reviewed literature that this is the case.
In some texts, Velcro is mentioned as a more sustainable alternative to permanent attachment
procedures – such as welding – because it promotes easy disassembly and allows for
remanufacturing. An entry in the Encyclopedia of Production and Manufacturing Management
recommends: “Replace screws, glues and welds with new two-way snap-fit or velcro fasteners.
Taking apart a snap-fitted or Velcro-fitted product is easier, and requires less energy than taking
apart a welded product” [501]. A conference working paper on design for disassembly, provides
a list of ‘traditional’ disassembly methods “in order, from greatest to least disassemblability”
[502]. The list is as follows: “velcro, collets, clips, slip fit, bolted, force fit, welded with same
material and welded with another material or glued” [502].
Competitor Description
One of the first Velcro-related patents in the US states that Velcro is intended to replace “slide fasteners,
buttons and other attachments of this type, particularly when a flexible closure, which is invisible and can
be opened easily, is desirable” [498]. The competitors for Velcro considered here are buttons, zippers, and
shoelaces. These are all temporary attachment devices for clothing-related applications.
224
Buttons [503], Zipper/Slide Fastener [504], Shoelaces [505].
Comparison of Environmental Impact of BID and Competitor
When compared to competing temporary attachment devices – such as buttons, zippers, shoelaces – there is
no logical or fundamental reason why Velcro would offer an environmental advantage. All of these
attachment devices already operate mechanically, using only human energy. Ostensibly, the only
differences in use between these options and Velcro are: (1) the aesthetic appearance of the fastening
device, as well as (2) the level of fine motor skills required in fastening and unfastening the device.
Any environmental impact differences would be unrelated to the bioinspired shape of the hooks and loops
of Velcro, except for, perhaps, the manufacturing processes required to produce the hook and loops.
Examples in the literature that cite Velcro as a more sustainable alternative to welding, for instance, are not
citing the most common applications for Velcro, and their claims would hold true for a wide range of
temporary attachment devices, not just those inspired by the hooks of the cocklebur.
Conclusion: Velcro does not meet criterion #3.
225
Appendix D: Green Design Guidelines Adapted From Telenko [61]
A. Ensure sustainability of resources by: 1. Specifying renewable and abundant resources
2. Specifying recyclable, or recycled materials, especially those within the company or for which a
market exists or needs to be stimulated
3. Layering recycled and virgin material where virgin material is necessary
4. Exploiting unique properties of recycled materials
5. Employing common and remanufactured components across models
6. Specifying mutually compatible materials and fasteners for recycling
7. Specifying one type of material for the product and its subassemblies
B. Ensure healthy inputs and outputs by: 8. Installing protection against release of pollutants and hazardous substances
9. Specifying non-hazardous and otherwise environmentally “clean” substances, especially in regards
to user health
10. Ensuring that wastes are water-based or biodegradable
11. Specifying the cleanest source of energy
12. Including labels and instructions for safe handling of toxic materials
13. Specifying clean production processes for the product and in selection of components
14. Concentrating toxic elements for easy removal and treatment
C. Ensure minimum use of resources in production and transportation phases by: 15. Replacing the functions and appeals of packaging through the product’s design
16. Employing folding, nesting or disassembly to distribute products in a compact state
17. Applying structural techniques and materials to minimize the total volume of material
18. Specifying lightweight materials and components
19. Specifying materials that do not require additional surface treatment of inks
20. Structuring the product to avoid rejects and minimize material waste in production
21. Minimizing the number of components
22. Specifying materials with low-intensity production and agriculture
23. Specifying clean, high-efficiency production processes
24. Employing as few manufacturing steps as possible
D. Ensure energy efficiency of resources during use by: 25. Implementing reusable supplies or ensuring the maximum usefulness of consumables
26. Implementing fail-safes against heat and material loss
27. Minimizing the volume and weight of parts and materials to which energy is transferred
28. Specifying best-in-class energy efficiency components
29. Implementing default power down for subsystems that are not in use
30. Ensuring rapid warm up and power down
31. Maximizing system efficiency for an entire range of real world conditions
32. Interconnecting available flows of energy and materials within the product or between the product
and its environment
226
33. Incorporating part-load operation and permitting users to turn off systems in part or whole
34. Use feedback mechanisms to indicate how much energy or water is being consumed
35. Incorporating intuitive controls for resource-saving features
36. Incorporating features that prevent waste of materials by the user
37. Defaulting mechanisms to automatically reset the product to its most efficient setting
E. Ensure appropriate durability of the product and components by: 38. Reutilizing high-embedded energy components
39. Planning for on-going efficiency improvements
40. Improving aesthetics and functionality to ensure the aesthetic life is equal to the technical life
41. Ensuring minimal maintenance and minimizing failure modes in the product and its components
42. Specifying better materials, surface treatments, or structural arrangements to protect products from
dirt, corrosion, and wear
43. Indicating on the product which parts are to be cleaned/maintained in a specific way
44. Making wear detectable
45. Allowing easy repair and upgrading, especially for components that experience rapid change
46. Requiring few service and inspection tools
47. Facilitating testing of components
48. Allowing for repetitive dis- and re- assembly
F. Ensure disassembly, separation, and purification by: 49. Indicating on the product how it should be opened and make access points obvious
50. Ensuring that joints and fasteners are easily accessible
51. Maintaining stability and part placement during disassembly
52. Minimizing the # and variety of joining elements
53. Ensuring that destructive disassembly techniques do not harm people or reusable components
54. Ensuring reusable parts can be cleaned easily and without damage
55. Ensuring that incompatible materials are easily separated
56. Making component interfaces simple and reversibly separable
57. Organizing in hierarchical modules by aesthetic, repair, and end-of-life protocol
58. Implementing reusable/swappable platforms, modules, and components
59. Condensing into a minimal # of parts
60. Specifying compatible adhesives, labels, surface coatings, pigments, etc. which do not interfere
with cleaning
61. Employing one disassembly direction without reorientation
62. Specifying all joints so that they are separable by hand or only a few, simple tools
63. Minimizing the number and length of operations for detachment
64. Marking materials in moulds with types and reutilization protocol
65. Using a shallow or open structure for easy access to subassemblies
227
Appendix E: 128 Sources Analyzed in BID Benefits Study
Table 18: 128 Sources Analyzed in BID Benefits Study. The first 29 with an asterisk*
provide an extended explanation of BID benefits.
# Source
*1 [506] Chakrabarti, A. and L. H. Shu, 2010, “Biologically Inspired Design,” Artificial Intelligence
for Engineering Design, Analysis, and Manufacturing, Vol. 24, pp. 453-454.
*2 [12] Wilson, J. O. and D. Rosen, 2007, "Systematic Reverse Engineering of Biological Systems,"
IDETC/CIE 2007, Las Vegas, Nevada, DETC2007-35395.
*3 [97] Nagel, J. K. S., R. B. Stone and D. A. McAdams, 2010, "Exploring the Use of Category and
Scale to Scope a Biological Functional Model," IDETC/CIE2010, Montreal, Canada,
DETC2010-28873.
*4 [507] Coelho, D. A. and C. A. M. Versos, 2011, “A Comparative Analysis of Six Bionic Design
Methods,” International Journal of Design Engineering, Vol. 4, No. 2, pp. 114-131.
*5 [508] Vandevenne, D., P.-A. Verhaegen, S. Dewulf and J. R. Duflou, 2012, "Automatically
Populating the Biomimicry Taxonomy for Scalable Systematic Biologically-Inspired
Design," IDETC/CIE 2012, Chicago, IL, DETC2012-70928.
*6 [509] Glier, M. W., J. Tsenn, J. S. Linsey and D. A. McAdams, 2012, "Evaluating the Directed
Method for Bioinspired Design," IDETC/CIE 2012, Chicago, IL, DETC2012-71511.
*7 [127] Bar-Cohen, Y., 2006, “Biomimetics - Using Nature to Inspire Human Innovation,”
Bioinspiration and Biomimetics, Vol. 1, pp. P1-P12.
*8 [86] Vincent, J. F. V. and D. L. Mann, 2002, “Systematic Technology Transfer from Biology to
Engineering,” Philosophical Transactions of the Royal Society A, Vol. 360, pp. 159-173.
*9 [13] Helms, M., A. Goel and S. Vattam, 2010, "The Effect of Functional Modeling on
Understanding Complex Biological Systems," IDETC/CIE 2010, Montreal, Canada,
DETC2010-28939.
*10 [116] Vogel, S., 1998, Cats' Paws and Catapults: Mechanical Worlds of Nature and People,
W.W. Norton & Company, New York.
*11 [117] Solga, A., Z. Cerman, B. F. Striffler, M. Spaeth and W. Barthlott, 2007, “The Dream of
Staying Clean: Lotus and Biomimetic Structures,” Bioinspiration and Biomimetics, Vol. 2,
No. 4, pp. S126-S134.
*12 [72] Bruck, H. A., A. L. Gershon, I. Golden, S. K. Gupta, L. S. G. Jr, E. B. Magrab and B. W.
Spranklin, 2007, “Training Mechanical Engineering Students to Utilize Biological
Inspiration During Product Development,” Bioinspiration and Biomimetics, Vol. 2, No. 4,
pp. S198-S209.
*13 [220] Otero, T., 2008, “Reactive Conducting Polymers as Actuating Sensors and Tactile Muscle,”
Bioinspiration and Biomimetics, Vol. 3, No. 3, pp. 035004.
*14 [510] Forbes, P., 2005, "Something New Under the Sun," The Gecko's Foot: Bio-inspiration:
Engineering New Materials from Nature, W.W. Norton & Company, Inc., New York, NY,
pp. 1-28.
*15 [139] Gunderson, S. L. and R. C. Schiavone, 1995, "Microstructure of an Insect Cuticle and
Applications to Advanced Composites," Biomimetics: Design and Processing of Materials
(M. Sarikaya and I. A. Aksay, Eds.), AIP Press, Woodbury, New York, pp. 163-197.
*16 [122] Frankel, R. B. and D. A. Bazylinski, 1995, "Structure and Function of Magnetosomes in
Magnetotactic Bacteria," Biomimetics: Design and Processing of Materials (M. Sarikaya
and I. A. Aksay, Eds.), AIP Press, Woodbury, New York, pp. 199-215.
*17 [98] Trexler, M. and R. M. Deacon, 2012, "Artificial Senses and Organs: Natural Mechanisms
and Biomimetic Devices," Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.),
CRC Press, Boca Raton, FL, pp. 35-93.
228
Table 18, cont. *18 [239] Masselter, T., G. Bauer, F. Gallenmuller, T. Haushahn, S. Poppinga, C. Schmitt, R. Seidel,
O. Speck, M. Thielen, T. Speck, W. Barthlott, P. Ditsche-Kuru, H. Immink, J. Bertling, N.
Molders, A. Nellesen, M. Rechberger, F. Cichy, M. Gude, M. Hermann, K. Lunz, J.
Knippers, J. Lienhard, S. Schleicher, R. Luchsinger, C. Mattheck, I. Tesari, M. Milwich, T.
Stegmaier, C. Neinhuis and H. Schwager, 2012, "Biomimetic Products," Biomimetics:
Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 377-429.
*19 [229] Stachelberger, H., P. Gruber and I. C. Gebeshuber, 2011, "Biomimetics: Its Technological
and Societal Potential," Biomimetics - Materials, Structures and Processes (P. Gruber, D.
Bruckner, C. Hellmichet al, Eds.), Springer, New York.
*20 [69] Bar-Cohen, Y., 2006, "Introduction to Biomimetics: The Wealth of Inventions in Nature as
an Inspiration for Human Innovation," Biomimetics: Biologically Inspired Technologies (Y.
Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 1-40.
*21 [511] Gruber, P., D. Bruckner, C. Hellmich, H.-B. Schmiedmayer, H. Stachelberger and I. C.
Gebeshuber, 2011, "Preface," Biomimetics - Materials, Structures, and Processes, Springer,
New York.
*22 [67] Nagel, R. L., P. A. Midha, A. Tinsley, R. B. Stone, D. A. McAdams and L. H. Shu, 2008,
“Exploring the Use of Functional Models in Biomimetic Conceptual Design,” Journal of
Mechanical Design, Vol. 130.
*23 [512] Jenkins, C. H. M., 2005, "Preface," Compliant Structures in Nature and Engineering (C. H.
M. Jenkins, Ed.), WIT Press, Billerica, MA.
*24 [68] Ball, P., 2001, “Life's Lessons in Design,” Nature, Vol. 409, pp. 413-416.
*25 [270] Allen, R., 2010, "Introduction," Bulletproof Feathers: How Science Uses Nature's Secrets to
Design Cutting-Edge Technology (R. Allen, Ed.), The University of Chicago Press,
Chicago, pp. 6-21.
*26 [155] Hobaek, T. C., K. G. Leinan, H. P. Linaas and C. Thaulow, 2011, “Surface Nanoengineering
Inspired by Evolution,” BioNanoScience, Vol. 1, No. 3, pp. 63-77.
*27 [43] Raibeck, L., J. Reap and B. Bras, 2008, "Investigating Environmental Benefits of
Biologically Inspired Self-Cleaning Surfaces," 15th CIRP International Conference on Life
Cycle Engineering, Sydney, Australia.
*28 [62] Wadia, A. P. and D. A. McAdams, 2010, "Developing Biomimetic Guidelines for the
Highly Optimized and Robust Design of Complex Products or Their Counterparts,"
IDETC/CIE2010, Montreal, Canada, DETC2010-28708.
*29 [119] Nagel, J. K. S., R. L. Nagel, R. B. Stone and D. A. McAdams, 2010, “Function-Based,
Biologically Inspired Concept Generation,” Artificial Intelligence for Engineering Design,
Analysis, and Manufacturing, Vol. 24, No. 04, pp. 521-535.
30 [156] Langella, C., 2006, "Hybrid Design. Encoding Biological Principles in Sustainable Design,"
Sustainable Consumption and Production: Opportunities and Challenges, Wuppertal,
Germany.
31 [136] Richter, K. and I. Grunwald, 2010, "Bio-inspired Polyphenolic Adhesives for Medical and
Technical Applications: Introduction," Biological Adhesive Systems: From Nature to
Technical and Medical Application (J. v. Byern and I. Grunwald, Eds.), Springer-
Verlang/Wien, Austria, pp. 201-202.
32 [513] Yang, H. T. Y., C.-H. Lin, D. Bridges, C. J. Randall and P. K. Hansma, 2010, “Bio-Inspired
Passive Actuator Simulating an Abalone Shell Mechanism for Structural Control,” Smart
Materials and Structures, Vol. 19, No. 10.
33 [70] Hambourger, M., G. F. Moore, D. M. Kramer, D. Gust, A. L. Moore and T. A. Moore, 2009,
“Biology and Technology for Photochemical Fuel Production,” Chemical Society Reviews
Vol. 38, No. 1, pp. 25-35.
229
Table 18, cont. 34 [152] Knippers, J. and T. Speck, 2012, “Design and Construction Principles in Nature and
Architecture,” Bioinspiration and Biomimetics, Vol. 7, No. 1, pp. 015002.
35 [28] Reap, J., D. Baumeister and B. Bras, 2005, "Holism, Biomimicry and Sustainable
Engineering," ASME IMECE, Orlando, Florida, IMECE2005-81343.
36 [11] Vincent, J. F. V., O. A. Bogatyreva, N. R. Bogatyrev, A. Bowyer and A.-K. Pahl, 2006,
“Biomimetics: Its Practice and Theory,” Journal of the Royal Society Interface, Vol. 3, pp.
471-482.
37 [85] Vattam, S. S., M. E. Helms and A. K. Goel, 2010, “A Content Account of Creative
Analogies in Biologically Inspired Design,” Artificial Intelligence for Engineering Design,
Analysis, and Manufacturing, Vol. 24, No. 4, pp. 467-481.
38 [226] Bhushan, B., 2012, Biomimetics: Bioinspired Hierarchial-Structured Surfaces for Green
Science and Technology, Springer, New York.
39 [514] Sartori, J., U. Pal and A. Chakrabarti, 2010, “A Methodology for Supporting "Transfer" in
Biomimetic Design,” Artificial Intelligence for Engineering Design, Analysis, and
Manufacturing, Vol. 24, pp. 483-505.
40 [14] Nagel, J. K., 2010, "Systematic Design of Biologically-Inspired Engineering Solutions,"
Mechanical Engineering, Oregon State University,
41 [245] Vattam, S. S. and A. K. Goel, 2011, "Foraging for Inspiration: Understanding and
Supporting the Online Information Seeking Practices of Biologically Inspired Designers,"
ASME 2011 International Design Engineering Technical Conferences & Computeres and
Information in Engineering Conference, Washington, DC, DETC2011-48238.
42 [228] Anastas, P. T. and J. C. Warner, 1998, "Future Trends in Green Chemistry," Green
Chemistry: Theory and Practice, Oxford University Press, Oxford, pp. 115-119.
43 [188] Turney, T., 2009, "Future Materials and Performance," Technology, Design and Process
Innovation in the Built Environment (P. Newton, K. Hampson and R. Drogemuller, Eds.),
Taylor & Francis, New York, pp. 31-53.
44 [247 ] Shu, L. H., 2010, “A Natural-Language Approach to Biomimetic Design,” Artificial
Intelligence for Engineering Design, Analysis, and Manufacturing, Vol. 24, No. 4, pp. 507-
519.
45 [114] Chiu, I. and L. H. Shu, 2007, “Biomimetic Design Through Natual Language Analysis to
Facilitate Cross-Domain Information Retrieval,” Artificial Intelligence for Engineering
Design, Analysis, and Manufacturing, Vol. 21, pp. 45-59.
46 [515] Tarascon, J.-M., 2008, “Towards Sustainable and Renewable Systems for Electrochemical
Energy Storage,” ChemSUSChem, Vol. 1, No. 8-9, pp. 777-779.
47 [227] Vincent, J., 2009, “Biomimetics - A Review,” Proceedings of the Institution of Mechanical
Engineers, Part H: Journal of Engineering and Medicine, Vol. 223, No. 8, pp. 919-939.
48 [115] Cheong, H., I. Chiu, L. H. Shu, R. B. Stone and D. A. McAdams, 2011, “Biologically
Meaningful Keywords for Functional Terms of the Functional Basis,” Journal of
Mechanical Design, Vol. 133, No. 2, pp. 021007-1.
49 [94] Ke, J., I. Chiu, J. S. Wallace and L. H. Shu, 2010, "Supporting Biomimetic Design by
Embedding Metadata in Natural-Language Corpora," ASME IDETC/CIE 2010, Montreal,
Canada, DETC2010-29057.
50 [24] Moore, A. L., D. Gust and T. A. Moore, 2007, “Bio-inspired Constructs for Sustainable
Energy Production and Use,” L'Actualite Chimique, No. 308-309, pp. 50-56.
51 [234] Nagel, J. K. S., R. B. Stone and D. A. McAdams, 2010, "An Engineering-to-Biology
Thesaurus for Engineering Design," ASME IDETC/CIE 2010, Montreal, Canada,
DETC2010-28233.
52 [222] French, M., 1994, Invention and Evolution: Design in Nature and Engineering, Cambridge
University Press, New York.
230
Table 18, cont. 53 [88] Cheong, H., I. Chiu and L. H. Shu, 2010, "Extraction and Transfer of Biological Analogies
for Creative Concept Generation," IDETC/CIE 2010, Montreal, Canada, DETC2010-29006.
54 [230] Gruber, P., 2011, "Biomimetics in Architecture [Architekturbionik]," Biomimetics -
Materials, Structures and Processes (P. Gruber, D. Bruckner, C. Hellmichet al, Eds.),
Springer, New York, NY, pp. 127-148.
55 [516] Vincent, J. F. V., 2005, "Compliant Structures and Materials in Animals," Compliant
Structures in Nature and Engineering (C. H. M. Jenkins, Ed.), WIT Press, Billerica, MA,
pp. 3-20.
56 [217] Ennos, A. R., 2005, "Compliance in Plants," Compliant Stuctures in Nature and
Engineering (C. H. M. Jenkins, Ed.), WIT Press, Billerica, MA, pp. 21-37.
57 [517] Jenkins, C. H. M., 2005, "Design of Compliant Structures," Compliant Structures in Nature
and Engineering (C. H. M. Jenkins, Ed.), WIT Press, Billerica, MA, pp. 247-261.
58 [518] Glier, M. W., J. Tsenn, J. S. Linsey and D. A. McAdams, 2011, "Methods for Supporting
Bioinspired Design," International Mechanical Engineering Congress & Exposition,
Denver, Colorado, IMECE2011-63247.
59 [519] Meijer, K., J. C. Moreno and H. H. C. M. Savelberg, 2006, "Biological Mechanisms as
Models for Mimicking: Sarcomere Design, Arrangement and Muscle Function,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 41-56.
60 [240] Lipson, H., 2006, "Evolutionary Robotics and Open-Ended Design Automation,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 129-153.
61 [118] Hanson, D., 2006, "Robotic Biomimesis of Intelligent Mobility, Manipulation, and
Expression," Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC
Press, Boca Raton, FL, pp. 177-200.
62 [520] Ummat, A., A. Dubey and C. Mavroidis, 2006, "Bio-Nanorobotics: A Field Inspired by
Nature," Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC Press,
Boca Raton, FL, pp. 201-227.
63 [106] Zhang, S., H. Yokoi and X. Zhao, 2006, "Molecular Design of Biological and Nano-
Materials," Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC
Press, Boca Raton, FL pp. 229-242.
64 [219] Dennis, R. G. and H. Herr, 2006, "Engineered Muscle Actuators: Cells and Tissues,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 243-266.
65 [521] Bar-Cohen, Y., 2006, "Artificial Muscles Using Electroactive Polymer," Biomimetics:
Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp.
267-290.
66
[522] Szema, R. and L. P. Lee, 2006, "Biologically Inspired Optical Systems," Biomimetics:
Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp.
291-308.
67 [125] Nemat-Nasser, S., S. Nemat-Nasser, T. Plaisted, A. Starr and A. V. Amirkhizi, 2006,
"Mulitfunctional Materials," Biomimetics: Biologically Inspired Technologies (Y. Bar-
Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 309-340.
68 [523] Carlson, J., S. Ghaey, S. Moran, C. A. Tran and D. L. Kaplan, 2006, "Biological Materials
in Engineering Mechanisms," Biomimetics:Biologically Inspired Technologies (Y. Bar-
Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 365-379.
69 [103] Gorb, S. N., 2006, "Functional Surfaces in Biology: Mechanisms and Applications,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raon, FL, pp. 381-397.
231
Table 18, cont. 70 [524] Lou, Z., S. Hosoe and M. Ito, 2006, "Biomimetic and Biologically Inspired Control,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 399-425.
71 [329] Stahlberg, R. and M. Taya, 2006, "Nastic Structures: The Enacting and Mimicking of Plant
Movements," Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC
Press, Boca Raton, FL, pp. 473-493.
72 [104] Muller, R., J. Ma, Z. Yan, C. Grimm and W. Mio, 2011, "Bioinspiration from Biodiversity
in Sensor Design," International Mechanical Engineering Congress & Exposition, Denver,
Colorado, IMECE2011-64487.
73 [208] Wainwright, S. A., W. D. Biggs, J. D. Currey and J. M. Gosline, 1976, Mechanical Design
in Organisms, John Wiley & Sons, Inc., New York.
74 [120] Harris, C. M., 2009, “Biomimetics of Human Movement: Functional or Aesthetic?,”
Bioinspiration and Biomimetics, Vol. 4, No. 3, pp. 033001.
75 [525] Plamondon, N. and M. Nahon, 2009, “A Trajectory Tracking Controller for an Underwater
Hexapod Vehicle,” Bioinspiration and Biomimetics, Vol. 4, No. 3, pp. 036005.
76 [231] Vogel, S., 2009, “Nosehouse: Heat-Conserving Ventilators Based on Nasal Counterflow
Exchangers,” Bioinspiration and Biomimetics, Vol. 4, No. 4, pp. 046004.
77 [526] Armour, R., K. Paskins, A. Bowyer, J. Vincent and W. Megill, 2007, “Jumping Robots: A
Biomimetic Solution to Locomotion Across Rough Terrain,” Bioinspiration and
Biomimetics, Vol. 2, No. 3, pp. S65-S82.
78 [527] Dabiri, J. O., 2007, “Renewable Fluid Dynamic Energy Derived from Aquatic Animal
Locomotion,” Bioinspiration and Biomimetics, Vol. 2, No. 3, pp. L1-L3.
79 [121] Abdel-Aal, H. A. and M. E. Mansori, 2011, "Chapter 4: Reptilian Skin as a Biomimetic
Analogue for the Design of Deterministic " Biomimetics - Materials, Structures and
Processes (P. Gruber, D. Bruckner, C. Hellmichet al, Eds.), Springer, New York, NY, pp.
51-79.
80 [101] Gorb, S. N., M. Sinha, A. Peressadko, K. A. Daltorio and R. D. Quinn, 2007, “Insects Did It
First: A Micropatterned Adhesive Tape for Robotic Applications,” Bioinspiration and
Biomimetics, Vol. 2, No. 4, pp. S117-S125.
81 [144] Helms, M., S. S. Vattam and A. K. Goel, 2009, “Biologically Inspired Design: Process and
Products,” Design Studies, Vol. 30, No. 5, pp. 606-622.
82 [528] Gopal, V. and M. J. Z. Hartmann, 2007, “Using Hardware Models to Quantify Sensory Data
Acquisition Across the Rat Vibrissal Array,” Bioinspiration and Biomimetics, Vol. 2, No. 4,
pp. S135-S145.
83 [237] Muller, R. and R. Kuc, 2007, “Biosonar-Inspired Technology: Goals, Challenges and
Insights,” Bioinspiration and Biomimetics, Vol. 2, No. 4, pp. S146-S161.
84 [213] Liu, C., 2007, “Micromachined Biomimetic Artificial Haircell Sensors,” Bioinspiration and
Biomimetics, Vol. 2, No. 4, pp. S162-S169.
85 [529] Nakrani, S. and C. Tovey, 2007, “From Honeybees to Internet Servers: Biomimicry for
Distributed Management of Internet Hosting Centers,” Bioinspiration and Biomimetics, Vol.
2, No. 4, pp. S182-S197.
86 [75] Nagel, J. K. S. and R. B. Stone, 2011, "A Systematic Approach to Biologically-Inspired
Engineering Design," ASME 2011 International Design Engineering and Technical
Conferences & Computers and Information in Engineering Conference, Washington, DC,
DETC2011-47398.
87 [123] Beheshti, N. and A. C. Mcintosh, 2007, “The Bombardier Beetle and Its Use of a Pressure
Relief Valve System to Deliver a Periodic Pulsed Spray,” Bioinspiration and Biomimetics,
Vol. 2, No. 4, pp. 57-64.
232
Table 18, cont. 88 [530] Margerie, E. d., J. Mouret, S. Doncieux and J.-A. Meyer, 2007, “Artificial Evolution of the
Morphology and Kinematics in a Flapping-Wing Mini-UAV,” Bioinspiration and
Biomimetics, Vol. 2, No. 4, pp. 65-82.
89 [531] Bartol, I., M. Gordon, P. Webb, D. Weihs and M. Gharib, 2008, “Evidence of Self-
Correcting Spiral Flows in Swimming Boxfishes,” Bioinspiration and Biomimetics, Vol. 3,
No. 1, pp. 014001.
90 [225] Vargas, A., R. Mittal and H. Dong, 2008, “A Computational Study of the Aerodynamic
Performance of a Dragonfly Wing Section Gliding in Flight,” 2008, Vol. 3, No. 2, pp.
026004.
91 [96] Glier, M. W., D. A. McAdams and J. S. Linsey, 2011, "Concepts in Biomimetic Design:
Methods and Tools to Incorporate into a Biomimetic Design Course," ASME 2011 Design
Engineering Technical Conferences & Computers and Information in Engineering
Conference, Washington, DC, DETC2011-48571.
92 [532]
Myrick, A., K.-C. Park, J. R. Hetling and T. C. Baker, 2008, “Real-Time Odor
Discrimination Using a Bioelectronic Sensor Array Based on the Insect
Electroantennogram,” Bioinspiration and Biomimetics, Vol. 3, No. 4, pp. 046006.
93 [201]
Wainwright, S. A., 1995, "What We Can Learn from Soft Biomaterials and Structures,"
Biomimetics: Design and Processing of Materials (M. Sarikaya and I. A. Aksay, Eds.), AIP
Press, Woodbury, New York, pp. 1-12.
94 [533] Sarikaya, M., J. Liu and I. A. Aksay, 1995, "Nacre: Properties, Crystallography,
Morphology, and Formation," Biomimetics: Design and Processing of Materials (M.
Sarikaya and I. A. Aksay, Eds.), AIP Press, Woodbury, New York, pp. 35-90.
95 [534] Mann, S., 1995, "Biomineralization, the Inorganic-Organic Interface, and Crystal
Engineering," Biomimetics: Design and Processing of Materials (M. Sarikaya and I. A.
Aksay, Eds.), AIP Press, Woodbury, New York, pp. 91-116.
96 [535] Calvert, P., 1995, "Biomimetic Ceramics and Hard Composites," Biomimetics: Design and
Processing of Materials (M. Sarikaya and I. A. Aksay, Eds.), AIP Press, Woodbury, New
York, pp. 145-161.
97 [82] Mak, T. W. and L. H. Shu, 2004, “Abstraction of Biological Analogies for Design,” CIRP
Annals - Manufacturing Technology, Vol. 53, No. 1, pp. 117-120.
98 [71] Vincent, J. F. V., 2008, “Biomimetic Materials,” Journal of Materials Research, Vol. 23,
No. 12, pp. 3140-3147.
99 [154] Bar-Cohen, Y., 2012, "Introduction: Nature as a Source of Inspiring Innovation,"
Biomimetics:Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL,
pp. 1-34.
100 [536] Vattam, S. S., M. Helms and A. K. Goel, 2010, "Biologically Inspired Design: A
Macrocognitive Account," IDETC/CIE 2010, Montreal, Canada, DETC2010-28567.
101 [537] Potter, K. A., B. Gui and J. R. Capadona, 2012, "Biomimicry at the Cell-Material Interface,"
Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL,
pp. 95-129.
102 [73] Rey, A. D., D. Pasini and Y. K. Murugesan, 2012, "Multiscale Modeling of Plant Cell Wall
Architecture and Tissue Mechanics for Biomimetic Applications," Biomimetics: Nature-
Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 131-168.
103 [202] Strange, D. G. T. and M. L. Oyen, 2012, "Biomimetic Composites," Biomimetics: Nature-
Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 169-212.
104 [194] Wolpert, H. D., 2012, "Biological Optics," Biomimetics: Nature-Based Innovation (Y. Bar-
Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 267-305.
105 [110] Lee, D. W., 2012, "Biomimicry of the Ultimate Optical Device - The Plant," Biomimetics:
Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 307-330.
233
Table 18, cont. 106 [137] Yen, J., M. J. Weissburg, M. Helms and A. K. Goel, 2012, "Biologically Inspired Design: A
Tool for Interdisciplinary Education," Biomimetics: Nature-Based Innovation (Y. Bar-
Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 331-360.
107 [105] Barthelat, F., 2007, “Biomimetics for Next Generation Materials,” Philosophical
Transactions of the Royal Society A, Vol. 365, No. 1861, pp. 2907-2919.
108 [111] Argunsah, H. and B. L. Davis, 2012, "Application of Biomimetics in the Design of Medical
Devices," Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 445-459.
109 [538] Fish, F. E., A. J. Smits, H. Haj-Hariri, H. Bart-Smith and T. Iwasaki, 2012, "Biomimetic
Swimmer Inspired by the Manta Ray," Biomimetics: Nature-Based Innovation (Y. Bar-
Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 495-523.
110 [124] Kulfan, B. M. and A. J. Colozza, 2012, "Biomimetics and Flying Technology,"
Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL,
pp. 525-674.
111 [190] Bar-Cohen, Y., 2012, "Biomimetics - Reality, Challenges, and Outlook," Biomimetics:
Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 693-714.
112 [539] Weiner, S. and P. Zaslansky, 2004, "Structure-Mechanical Function Relations in Bones and
Death," Learning from Nature How to Design New Implantable Biomaterials: From
Biomineralization Fundamentals to Biomimetic Materials and Processing Routes (R. L.
Reis and S. Weiner, Eds.), Kluwer Academic Publishers, Dordrecht, The Netherlands, pp. 3-
13.
113 [126] Leonor, I. B., H. S. Azevedo, I. Pahkuleva, A. L. Oliveira, C. M. Alves and R. L. Reis,
2004, "Learning from Nature How to Design Biomimetic Calcium-Phosphate Coatings,"
Learning from Nature How to Design New Implantable Biomaterials: From
Biomineralization Fundamental to Biomimetic Materials and Processing Routes (R. L. Reis
and S. Weiner, Eds.), Kluwer Academic Publishers, Dordrecht, The Netherlands, Vol. 171,
pp. 123-150.
114 [540] Aizenberg, J. and G. Hendler, 2004, "Learning from Marine Creatures How to Design
Micro-Lenses," Learning from Nature: How to Design New Implantable Biomaterials:
From Biomineralization Fundamentals to Biomimetic Materials and Processing Routes (R.
L. Reis and S. Weiner, Eds.), Kluwer Academic Publishers, Dordrecht, The Netherlands,
Vol. 171, pp. 151-166.
115 [9] Wikipedia,2012, Biomimicry. 2012.
116 [541] Isaacson, A.,2009, Nature Inspiring Green Design for Planes, Train, Autos & More. Popular
Mechanics.
117 [542] Freedman, M.,2010, Nature is the Model Factory. Newsweek.
118 [112] Gebeshuber, I. C., B. Y. Majlis and H. Stachelberger, 2009, “Tribology in Biology:
Biomimetic Studies Across Dimensions and Across Fields,” International Journal of
Mechanical and Materials Engineering, Vol. 4, No. 3, pp. 321-327.
119 [543] Offner, D. H., 1995, "Introduction to Design Homology," Design Homology: An
Introduction to Bionics, David Offner, Urbana, Illinois, pp. 1-12.
120 [209] Paturi, F. R., 1976, "Chapter 16: Where Do We Go from Here?," Nature: Mother of
Invention: The Engineering of Plant Life, Harper & Row, New York, NY, pp. 199-203.
121 [544] Reis, R. L., 2004, "Preface," Learning from Nature How to Design New Implantable
Biomaterials: From Biomimeralization Fundamentals to Biomimetic Materials and
Processing Routes (R. L. Reis and S. Weiner, Eds.), Kluwer Academic Publishers,
Dordrecht, The Netherlands, pp. xi-xiv.
234
Table 18, cont. 122 [74] Papanek, V., 1984, "Chapter 8: The Tree of Knowledge: Biological Prototypes in Design,"
Design for the Real World: Human Ecology and Social Change, Van Nostrand Reinhold,
New York, pp. 186-214.
123 [21] Benyus, J. M., 1997, Biomimicry: Innovation Inspired by Nature, William Morrow and
Company, Inc., New York.
124 [7] Wann, D., 1994, Biologic: Designing with Nature to Protect the Environment, Johnson
Books, Boulder, Colorado.
125 [135] Ausubel, K., 2004, "Introduction," Nature's Operating Instructions: The True
Biotechnologies (K. Ausubel and J. P. Harpignies, Eds.), Sierra Club Books, San Francisco.
126 [187] Benyus, J., 2004, "Biomimicry: What Would Nature Do Here?," Nature's Operating
Instructions: The True Biotechnologies (K. Ausubel and J. P. Harpignies, Eds.), Sierra Club
Books, San Francisco.
127 [113] Dickinson, M. H., 1999, “Bionics: Biological Insight into Mechanical Design,” PNAS:
Proceedings of the National Academy of Sciences, Vol. 96, No. 25, pp. 14208-14209.
128 [246] Yen, J. and M. Weissburg, 2007, “Editorial: Perspectives on Biologically Inspired Design:
Introduction to the Collected Contributions,” Bioinspiration and Biomimetics, Vol. 2, No. 4.
235
Appendix F: BIDs Found from Breadth and Depth Searches
Table 19: BIDs Found from Breadth and Depth Searches. Designs #1-95 were found
using the breadth search; designs #96-194 were found using the depth
search.
# Design Inspired By Sources
1 Dirt and water-repellent paint/coating Lotus leaf
[11,269-271]
2 Boat hulls Dolphin skin [271,272]
3 Sonar/radar Echolocation of bats [271]
4 Medical ultrasound imaging Echolocation of bats [271]
5 Velcro Burs, burdock plant [11,269,271,273]
6 Horn-shaped, saw-tooth design for lumberjack
blades
Wood-burrowing beetle [271]
7 Road reflectors Cat eyes [271]
8 Temperature-adapting clothing Pinecone [271]
9 Morphing aircraft wings Birds [113,271]
10 Morphing aircraft skin Fish scales [271]
11 RFID tags read through water and on metal Wing structure of blue
morpho butterfly
[271,314]
12 Nanosensors to detect explosives Wing structure of butterflies [271]
13 Adhesives Gecko feet [11,269,271,273]
14 Eastgate Centre cooling system Termite mound [35,269,271,274]
15 UAVs Hummingbirds [271]
16 B.I.A.S. Biologically Inspired Acoustic
Systems
Big brown bat [545]
17 Baleen water filters Blue whale [284]
18 BioBASE mooring for wave energy devices Bull kelp [274,546]
19 BioFriend anti-microbial filter Human cells [547]
20 Adhesive tape Insect feet [548]
21 Medical adhesive Sandcastle worm [549]
22 Biolytix water filter Natural decomposition on a
river’s edge
[275]
23 Biomatrica Sample Matrix – stores biological
samples without refrigeration
Brine shrimp (sea monkeys) [550]
24 Biodegradable water-soluble polymers Oyster [551]
25 BioSTREAM tidal energy harvester Bluefin tuna [552]
26 Calera cement-making process Skeletons of marine animals [285,286]
27 Daimler-Chrysler bionic car - shape Boxfish [269,273,274,276]
28 Daimler-Chrysler bionic car - structure –SKO
software
Initially, adaptive growth of
trees; later bones
[11,274,276,277]
29 CAO Software Initially bones; later trees [274,276,277]
30 Capillary faucet energy harvester Coconuts [553]
31 Carbon dioxide-based plastics Plants [554]
32 ChromaFlair color-shifting paint Morpho butterfly [555]
33 Crystal Palace in London Giant water lily [11,68,291]
34 Dew bank bottle Namib desert beetle, bumpy
surface of the elytra of
beetles
[11,556]
236
Table 19, cont. 35 Dyesol solar cells Photosynthesis [557]
36 Eco-machine wastewater treatment system Aquatic ecosystems [558]
37 FLOWE wind farm Fish [559]
38 Fog-catching materials Namib desert beetle [560]
39 Goateck traction hiking sole Mountain goats [561]
40 GreenShield fabric finish Morpho butterfly/lotus [562]
41 GROW Solar Ivy Leaves [563]
42 Heliotrope sun-tracking system for solar
panels
Flowers [564]
43 HotZone radiant heater, using IRLens Lobster eyes [287]
44 Humidity responsive silk fibers Spider [565]
45 Humidity sensor without electronics Hercules beetle [566]
46 i2 modular carpet Forest floor [278,279]
47 IntAct Labs, LLC biosensor Protein in mammalian ear
canals
[567]
48 Joinlox mechanical method of joining
components
Clams and other shellfish [568]
49 Kalundborg, Denmark Ecosystem symbiosis [274,569]
50 LOCUST visual collision detector Locusts swarms [570]
51 Self-cleaning clay roof Lotus, butterfly wings [571]
52 Self-cleaning Lotusan paint Lotus, butterfly wings [11,113,572]
53 Mechanically adaptive polymer
nanocomposites
Sea cucumber [573]
54 Medical implant coating Blue mussel [574]
55 Microfluidic silk assembly Spider [575]
56 Mincor TX TT self-cleaning textile coating Lotus [576]
57 Mirasol color electronic screens Morpho butterfly wings [273,289]
58 Morphotex structural colored fibers Morpho butterfly wings [254,577]
59 MothEye and MARAG anti-glare and anti-
reflective films
Eyes of nocturnal moths [578]
60 Nanosphere self-cleaning fabric Morpho butterfly wings [579]
61 ORNILUX glass that reduces bird collisions UV-reflective spider silk [580]
62 Pangolin backpack from recycled truck tubes Pangolin [581]
63 PAX water mixer Bull kelp [582]
64 PaxFan fans Bull kelp [583]
65 Phillips helmets with external membrane Human head [584]
66 Pipeline leak sealer Platelets [585]
67 Polar thermos cozy Polar bear [586]
68 Power Plastic solar cell Chlorophyll [587]
69 PureBond wood glue Blue mussel [588]
70 Self-cleaning fabric Doves [589]
71 Self-cleaning optical coatings Moth eyes and cicada wings [590]
72 Self-cleaning surface Spider hairs [591]
73 Sharklet antimicrobial surfaces Shark skin [269,280,281]
74 Shinkansen 500 series train - nose cone Kingfisher [254,269,277,282]
75 Shinkansen 500 series train - pantograph Owl [254,283]
76 Tunnel boring machine Shipworm [283]
77 Soil moving equipment Common earthworm [592]
237
Table 19, cont. 78 Solar water still and pump Tree [593]
79 Stabilitech vaccine stabilization technology Spikemoss [594]
80 Swiss Re headquarters building Sea sponge [595]
81 Sycamore ceiling fan Sycamore tree seed pod [596]
82 VitRIS and HydRIS vaccine stabilization
technologies
Anhydrobiosis in plants,
animals, and bacteria
[597]
83 Water-repellent ship coatings Water fern [598]
84 Flapping micro-aerial vehicles (MAVs) Insect flight [599]
85 Solar cells Apposition compound eyes
of some dipterans
[600]
86 Robots with compliant materials in
locomotory system (soft robots)
Tobacco hornworm
caterpillar (Manduca sexta)
[319]
87 Odor-detecting robots Moth behavior [601]
88 Robot that rights itself in midair Gecko [313]
89 Undulating robot that moves through air Snake [313]
90 UAVs that fly in updrafts Storks [313]
91 Micro-air vehicles Birds – hummingbird,
budgerigar
[11,313]
92 Robotic thorax Flies [313]
93 Micro-air vehicles with passive joints Seagulls [313]
94 Radio-controlled gliders Soaring ravens, turkey
vultures, seagulls, and
pelicans
[313]
95 Robotic maple seed Maple seed [313]
96 Earth ceramics with nanopores to control
humidity
Dirt in termite mounds [254]
97 Tiny solar batteries Way leaves turn sunlight into
energy
[254]
98 Body armor African freshwater fish
Polypterus senegalus scales
[254]
99 Pacemaker Humpback whale heart [254]
100 JR Central’s N700 series Shinkansen Front end modeled after an
eagle’s outstretched wings
[254]
101 Suitewall silica coating for exterior tiles Snail shell’s self-cleaning
bumps
[254]
102 Australia’s Biosignal Ltd. Healthcare products Algae’s ability to block
bacteria’s signals
[254]
103 Cooling system in Council House 2 in
Melbourne, Australia
Termite mound’s evaporative
cooling from aquifer water
[274,602]
104 Solar energy cell technology Photosynthesis [274]
105 Carbon Sequestration method from CO2
Solutions
Chemical processes in
mammals during respiration
[274]
106 Novomer carbon-based polymers used for
building materials
Carbon sequestration in
plants
[274]
107 Teatro del Agua- desalinization process in
Canary Islands by Grimshaw Architects
Namib desert beetle [274]
108 London’s Porticullis House Termite mounds [602]
109 Sharklet Marine boat hull coatings Shark skin [281]
238
Table 19, cont. 110 Sharklet Medical devices Shark skin [281]
111 Wind turbine blades Serrated fin of humpback
whale
[269]
112 Anti-counterfeit technology for bank notes,
passports, and credit cards
Iridescent colors of
Indonesian peacock butterfly
[269]
113 Leonardo da Vinci’s flying machines Birds [11,68]
114 Designing buildings from the roof down Bee and spider [11]
115 Henry Mitchell’s design of a pile made of
cones that digs itself into the ground
Forms of seed vessels [11]
116 Clement Ader’s steam powered aircraft (Eole) Bats wings [11]
117 Ignaz and Igo Etrich’s stable wing design Winged seed of Alsomitra
macrocarpa
[11]
118 Jeronimidis material that has glass fiber in
resin matrix making it tough in impact
Cellulose walls in wood,
wood in tension
[11]
119 Surface textures Lotus leaf [11]
120 Antireflective surfaces Insect eyes [11]
121 Antireflective surfaces Insect wings [11]
122 Antireflective surfaces Leaves of plants in the
understory of tropical
rainforests
[11]
123 Antireflective polythene sheet for solar panels
- 10% improvement in capture of light
Insect eyes, wings, or plant
leaves
[11]
124 Robotic control systems Natural neural circuits
especially in insects
[11]
125 Camouflage - Hugh Cott (presumably animals) [11]
126 Motion camouflage (staying in same spot in
visual field)
Dragonfly [11]
127 Surfaces of earth-moving machinery (ploughs,
bulldozers)
Geometrically optimized
ridges and bumps on soil-
moving animals
[11]
128 Hulls of sailing boats Vortices induces by ridges on
shark skin
[11]
129 Lining of pipes carrying liquid Vortices induces by ridges on
shark skin
[11]
130 Aircraft with a drag reduction of 5-10% Vortices induces by ridges on
shark skin
[11]
131 Aircraft wings with reduced drag, Airbus
A380
Divided wing tip of birds
with wings of low aspect
ratio (buzzard, vulture, eagle)
[11,288]
132 Underwater propellers with reduced drag Divided wing tip of birds
with wings of low aspect
ratio (buzzard, vulture, eagle)
[11]
133 Twiddlefish submersibles by Nekton, Inc. Fins of fish [11]
134 Low-drag dirigibles Penguin [11]
135 Lightweight tensile structures in architecture
(Frei Otto)
Spider webs [11]
136 Eiffel Tower Trabecular struts in the head
of a human femur or the taper
of a tulip stem
[11,68]
239
Table 19, cont. 137 Swimsuits Shark skin [11]
138 Entrance gate to world exposition in Paris in
1900
Radiolarians [68]
139 Wright brothers’ plane Swooping vultures [68]
140 C. Culmann’s construction crane Bone [68]
141 Sonar system Dolphins [256,270]
142 Acoustic Pulses Bottlenose dolphins [256]
143 Robocane Ecolocation [270]
144 Fins on modern aircraft wings that improve
airflow and reduce drag
“Fingers” on the wingtips of
birds of prey
[270]
145 Flipper-type propulsion system for underwater
robot vehicle
Turtle [270]
146 Foot-powered propulsion unit for kayak Penguin [270]
147 DIDSON acoustic camera Ecolocation [270]
148 Finnisterre breathable warm waterproof textile
for surfers
Waterproof pelage of seals
and otters
[270]
149 Chronino humanoid robot Human [270]
150 Underwater robotic vehicles that cancel out
departing vortices
Timing of fish tail strokes
and jellyfish pulses to
maximize energy recovery
from vortices
[270]
151 Geckel Geckos and mussels [270]
152 Pelamis wave converter – Aguacadoura wave
farm
The redundant vertebral units
of snakes
[270]
153 Microelectrodes for brain implants that are
stiff for insertion and then relax
Sea cucumber’s body states
that vary in stiffness
[270]
154 Micromechanical systems on AUVs Lateral line of a fish-
mechanoreceptor system
[270]
155 Robot that flies like a bird from Festo Bird- lightweight seagull [603]
156 Convert carpet How nature would
manufacture a floor
[279]
157 Self-repairing concrete Skin [314]
158 Surfboard Humpback whale [314]
159 Less painful needles Mosquito [314]
160 Passive systems to collect and distribute
naturally chilled water
Thorny devil [314]
161 Antifouling coating Adhesives secreted by
muscles
[272]
162 Biomimetic polymer for antifouling – zosteric
acid
Eel grass [272]
163 Antifouling – covalently cross-linked gel Skin of pilot whale [272]
164 X ray telescope Shrimp/lobster eye [478]
165 Collimator for x-ray lithography Lobster eye lens [478]
166 Car Paint Scarab beetle [273]
167 Increased solar cell light capture Hawkmoth [273]
168 Airbus 320 Shark skin riblets [113,273]
169 Bipedal robots Humans [273]
170 Novel, motion producing devices Muscles [273]
240
Table 19, cont. 171 Enzyme activity preservation Diatom [273]
172 Filtration, biosensor filtration, imunoisolation Diatom [273]
173 Surface adhesion Flies [273]
174 Surface adhesion Spiders [273]
175 Evolutionary Computing, Genetic Algorithms DNA [273]
176 Camouflage Moths [273]
177 Micro air vehicles leading edge vortex Hawkmoth [273]
178 Microair vehicles wing design Hummingbird [273]
179 Hydroplane strut wave reduction Bat Toes (for catching fish) [273]
180 Hydroplane strut wave reduction Black Skimmer Mandible [273]
181 Human oscillatory propelled exoskeletons,
flippers, and submarines
Tuna, dolphins, seals [273]
182 Robo-Tuna Tuna, dolphins, seals [273]
183 Underwater sensing, target acquisition,
obstacle avoidance
Mottled sculpin (fish) [273]
184 Data storage and readout, medical diagnostics,
surveillance, photography
Honeybee eye [273]
185 Underwater plume tracing and source finding Moths, lobsters [273]
186 Robotic source tracking using chemotaxis and
c.elegans based on neural network
C. Elegans [273]
187 Fluidic lens Whale eye [273]
188 Hydrophobic surfaces Rose petals [604]
189 Wood glue without toxins - Columbia Forest
Products
Secretions mussels use to
cling to surfaces underwater
[290]
190 Self-Healing Pipelines – Brinker Technology Platelets [290]
191 Biosignal film that prevents bacteria from
colonizing
Seaweed [290]
192 Qualcomm Mirasol display Butterfly wings, peacocks [290]
193 Carbozyme flue scrubber, converts CO2 to
limestone powder
Enzymes of mollusks [290]
194 Norian SRS biomineral bone cement used in
orthopedic surgery
Physiochemically-dominated
skeletogentic mechanism of
reef coral
[285]
241
Appendix G: Comparison of the Environmental Impact of BIDs and
Competitors Using GDGs with Justification
Nine sustainable BIDs were compared to a functionally-equivalent standard product using the
GDGs presented in Appendix D. The analysis is provided below. First, the guidelines met better by the
BIDs than their non-bioinspired competitor are provided, followed by the guidelines met worse by the BID
than their non-bioinspired competing product, if any, and the guidelines for which such an assessment is
uncertain, or only valid in some limited scenarios.
G.1 BIOLYTIX
Table 20: The GDGs met better by Biolytix than by its competitor.
GDG # Guideline Why Bioinspired Design Meets Guideline Better
1 Specifying renewable
and abundant resources
Biolytix uses solid waste in the system along with worms and
insects to filter and treat wastewater. All these inputs are both
renewable and abundant. In contrast, conventional septic systems
require nonrenewable chemical inputs.
2 Specifying recyclable, or
recycled materials,
especially those within
the company or for
which a market exists or
needs to be stimulated
The Biolytix process uses recycled human waste to filter new
wastewater. This does not occur in septic tanks.
4 Exploiting unique
properties of recycled
materials
The Biolytix process uses recycled human waste to filter new
wastewater.
9 Specifying non-
hazardous and otherwise
environmentally "clean"
substances, especially in
regards to user health
Biolytix uses worms and insects to filter and treat wastewater. In
contrast, conventional septic systems require potentially
hazardous chemical inputs for the disinfection process that
creates toxic byproducts.
10 Ensuring that wastes are
water-based or
biodegradable
Biolytix breaks down all waste and does not have the non-
biodegradable sludge byproduct that a traditional septic tank
does. Additionally, Biolytix uses solid waste in the system along
with worms and insects to filter and treat wastewater. In contrast,
conventional septic systems require chemical inputs that are
potentially not water-based or biodegradable. Presumably, the
chemicals used would be harsh biocides – as their function is to
kill all bacteria and pathogens in the waste.
18 Specifying lightweight
materials and
components
Because of the way Biolytix is designed, it is more efficient at
filtering and treating waste than a septic system. Consequently,
for the same amount of filtration, a Biolytix system can be
smaller than a septic system. This means the weight is minimized
and less energy needs to be transferred to the system during
transport of the system to the point of use.
242
Table 20, cont. 25 Implementing reusable
supplies or ensuring the
maximum usefulness of
consumables
Biolytix uses solid waste in the system along with worms and
insects – reusable supplies – to filter and treat wastewater. In
contrast, conventional septic systems require chemical inputs
which cannot be reused.
28 Specifying best-in-class
energy efficiency
components
In terms of energy consumption, Biolytix is more efficient than a
standard septic system. With Biolytix, a user can get the same
filtration output but with less energy input into aerating pumps to
remove the sludge.
32 Interconnecting available
flows of energy and
materials within the
product or between the
product and its
environment
The flow of waste material through the Biolytix filter is
interconnected with the functioning of the product. As the waste
is filtered, it becomes the humus, which then filters the next batch
of waste. Additionally, the Biolytix filter itself – which is filled
with worms and insects – functions much as a miniature soil
ecosystem, where the living organisms that are a part of the
product are interconnected with the filtering and treatment
functions to a greater extent than occurs in septic systems with
anaerobic bacteria.
41 Ensuring minimal
maintenance and
minimizing failure
modes in the product and
its components
Unlike septic systems, Biolytix does not need to be maintained
regularly for sludge removal.
G.2 DAIMLER-CHRYSLER BIONIC CAR – SHAPE
Table 21: The GDGs met better by the shape of the bionic car than by its competitor.
GDG # Guideline Why Bioinspired Design Meets Guideline Better
28 Specifying best-in-class
energy efficiency
components
The reduced drag of the bioinspired car results in fuel savings,
compared to the same car with a standard shape. Consequently,
the bioinspired car uses less fuel to go the same distance as its
nonbioinspired competitor, meaning it is more energy efficient.
243
G.3 DAIMLER-CHRYSLER BIONIC CAR – STRUCTURE
Table 22: The GDGs met better by the structure of the bionic car than by its competitor.
GDG # Guideline Why Bioinspired Design Meets Guideline Better
17 Applying structural
techniques and materials
to minimize the total
volume of material
The SKO method allows for light-weighting by getting rid of
unnecessary material. This method has reduced the frame weight
by 30% [368].
18 Specifying lightweight
materials and
components
The bioinspired SKO method reduces the weight of the car’s
structure by 30% [41].
27 Minimizing the volume,
area and weight of parts
and materials to which
energy is transferred
The bioinspired SKO method reduces the weight of the car
frame. Since energy is transferred to the car frame in the process
of moving the car, the bioinspired frame minimizes the weight of
parts and materials to which energy is transferred.
28 Specifying best-in-class
energy efficiency
components
The bioinspired SKO method reduces the weight of the car
frame. Consequently, the bioinspired car uses less fuel to go the
same distance as its non-bioinspired competitor, meaning it is
more energy efficient than its competitor.
244
G.4 EASTGATE CENTRE COOLING SYSTEM
Table 23: The GDGs met better by the Eastgate Centre’s cooling system than by its
competitor.
GDG # Guideline Why Bioinspired Design Meets Guideline Better
1 Specifying renewable
and abundant resources
Air circulation in Eastgate occurs as a result of the buoyancy
properties of the air and the geometric design of the building,
allowing for a substantial reduction in electricity consumption
when compared to an industrial air conditioning unit. The
buoyancy of air is both renewable and abundant, compared to the
electricity needed to power an industrial air conditioner.
11 Specifying the cleanest
source of energy
Eastgate uses geometry and waste heat from buildings along with
assisting fans instead of relying much more heavily on electricity
from ‘unclean’ sources, such as coal.
28 Specifying best-in-class
energy efficiency
components
Eastgate Centre’s cooling output is the same as a hypothetical
competing industrial air conditioner’s output. However, less
active energy, in the form of electricity, is needed in Eastgate
Centre to achieve this output than would be required by an
industrial air conditioner. Consequently, Eastgate Centre’s
passive cooling system is more energy efficient than the
competing industrial air conditioning system.
32 Interconnecting available
flows of energy and
materials within the
product or between the
product and its
environment
The waste heat from Eastgate Centre drives thermosiphon flow.
The higher velocity air at the top of the chimney drives the
induced flow. These flows of hot and cool air between the
cooling system and the atmosphere around the building produce
cooling. Consequently, Eastgate’s cooling system design
successfully interconnects available flows of air within itself and
between itself and its environment to produce cooling. In
contrast, air conditioners typically are stand-alone units, not
designed to take advantage of the physics of fluid flows outside
of the system.
245
G.5 INTERFACE FLOR I2 ENTROPY CARPET
Table 24: The GDGs met better by Entropy carpet than by its competitor.
GDG # Guideline Why Bioinspired Design Meets Guideline Better
5 Employing common and
remanufactured
components across
models
If each individual carpet or dye lot is viewed as its own model,
Entropy carpet is artistically designed to allow tiles to be used
across models, extending the useful lifetimes of these carpet tiles
and avoiding the need for new tiles to be manufactured.
Consequently, Entropy modular carpet meets the spirit of the
guideline.
20 Structuring the product
to avoid rejects and
minimize material waste
in production
Entropy carpet is artistically designed so that dye aberrations on
individual tiles are not noticed, reducing the scrap rates in
production.
40 Improving aesthetics and
functionality to ensure
the aesthetic life is equal
to the technical life
This guideline is met better by the Entropy carpet design than the
competitor in two ways: (1) Stains on a carpet tile are less
noticeable on entropy carpet, meaning it is less likely that a
stained tile would need to be replaced for aesthetic reasons, i.e.
the aesthetic life of the individual tiles is extended to better meet
the technical life of the tile. (2) If a stain is noticeable and a tile
needs to be replaced, only the stained tile needs to be replaced
with Entropy carpet, and the aesthetic quality of the carpet is
maintained. In this case, the aesthetic life of the carpet is better
maintained after a tile is replaced to better match the technical
life of the carpet.
45 Allowing easy repair and
upgrading, especially for
components that
experience rapid change
Entropy carpet allows for easier repair/upgrading of worn or
stained tiles than standard modular carpet because new Entropy
tiles blend in better with worn tiles, maintaining the appearance
and extending the life of the carpet. In the case of tiles with a
standard design, more tiles might need to be replaced at once, so
that the new tile would not stand out compared to the old tiles, or
the general appearance of the carpet would be compromised,
possibly resulting in a shorter overall lifetime of the carpet.
Additionally, old and new standard tiles would need to be from
the same dye lot and oriented according to nap.
58 Implementing
reusable/swappable
platforms, modules, and
components
Entropy carpet tiles are reusable/swappable carpet components.
Entropy tiles from different dye lots can be used together, in
contrast to standard modular carpets where tiles from different
dye lots cannot be swapped.
246
Table 25: The GDGs Entropy tiles might meet better than standard carpet tiles in some
scenarios.
GDG # Guideline Why Bioinspired Design Probably Meets Guideline Better
41 Ensuring minimal
maintenance and
minimizing failure
modes in the product and
its components
Carpet maintenance would most likely refer to cleaning the
carpet, but it could also refer to replacing tiles. Entropy carpet
tiles are slightly faster to replace than standard carpet tiles
because they do not need to be oriented according to nap
orientation. Consequently, they could be viewed as slightly
reducing the maintenance load compared to a standard carpet.
G.6 SELF-CLEANING TRANSPARENT THIN FILM
Table 26: The GDGs met better by the self-cleaning surface than by its competitor.
GDG # Guideline Why Bioinspired Design Meets Guideline Better
1 Specifying renewable
and abundant resources
The self-cleaning film uses gravity and surface texture in place of
added chemicals, water, and energy which would otherwise be
needed to clean the product
9 Specifying non-
hazardous and otherwise
environmentally "clean"
substances, especially in
regards to user health
Water mist is 'clean'. Trichloroethylene (the chemical cleaning
solvent in the industrially-cleaned scenario) causes cancer in
animals and is linked to kidney and liver disease in humans
[605].
11 Specifying the cleanest
source of energy
The self-cleaning surface uses gravity and the surface texture to
clean, instead of electricity.
25 Implementing reusable
supplies or ensuring the
maximum usefulness of
consumables
The self-cleaning surface uses less water during cleaning in the
use phase than a standard surface cleaned using spray or
ultrasonic aqueous cleaning methods.
27 Minimizing the volume,
area and weight of parts
and materials to which
energy is transferred
With the self-cleaning surface in the use phase, less water is used
(volume/weight are minimized) and less energy consequently
needs to be transferred to these materials during the cleaning
process.
28 Specifying best-in-class
energy efficiency
components
The same cleaning output is achieved by the self-cleaning surface
with less active energy required than when a standard surface is
cleaned using spray or ultrasonic aqueous cleaning methods.
32 Interconnecting available
flows of energy and
materials within the
product or between the
product and its
environment
The self-cleaning surface uses gravity and the texture of the
surface coating, instead of pressurized water and chemicals, to
reduce total energy and water consumption during cleaning. It
thereby utilizes available energy from within the product to
perform cleaning.
247
Table 27: The GDGs met worse by the self-cleaning surface than by its competitor.
GDG # Guideline Why Competitor Design Meets Guideline Better
7 Specifying one type of
material for the product
and its subassemblies
The self-cleaning film must be applied to the original surface
which is made of another type of material. In contrast, a standard
surface would be made of only one type of material.
19 Specifying materials that
do not require additional
surface treatment or inks.
The self-cleaning film is itself a surface treatment of material. A
standard material would not have a thin film or required surface
treatment.
22 Specifying materials
with low-intensity
production and
agriculture
The self-cleaning film is currently produced from titanium
acetylacetonate, aluminum acetylacetonate, boehmite, ethanol,
and a water repellent agent [27]. A lot of energy is consumed in
the production of these materials Raibeck, 2008 #26}. Ethanol,
for instance, is well-known to be an energy- and water-intensive
material.
24 Employing as few
manufacturing steps as
possible
The self-cleaning thin film must be applied to the surface during
manufacturing. For a standard surface, no application step is
required.
55 Ensuring that
incompatible materials
are easily separated.
The thin film and the glass surface probably cannot be recycled
together. The self-cleaning thin film is unlikely to be easily
separated from the surface of the part for recycling purposes,
compared to a standard part where no separation is necessary.
Table 28: The GDGs that might be met better by the self-cleaning surface than by its
competitor, but ambiguity exists.
GDG # Guideline Why Competitor Design Probably Meets Guideline Better
10 Ensuring that wastes are
water-based or
biodegradable
Tricloroethylene displays “very slow biodegradation” and
contamination of groundwater and soil “can be a very serious
problem” [606]. However, if you are cleaning a non-
biodegradable or non-water based substance off the part the
waste will not be guaranteed to be water-based or biodegradable.
Here, we consider the dirt on the part as an inherent part of the
waste being removed.
248
G.7 SHARKLET ANTIMICROBIAL SURFACE
Table 29: The GDGs met better by Sharklet than by its competitor.
GDG # Guideline Why Bioinspired Design Meets Guideline Better
9 Specifying non-
hazardous and otherwise
environmentally "clean"
substances, especially in
regards to user health
Sharklet can be used in place of toxic and biocidal disinfectants
or cleaning agents like Clorox that could directly harm the health
of the user, harm the health of the organisms that will contact the
waste water, or contribute to the evolution of superbugs, which
are environmentally ‘bad’ when taking an instrumental view of
the environment.
41 Ensuring minimal
maintenance and
minimizing failure
modes in the product and
its components
Sharklet ensures that cleaning-related maintenance is minimized.
Instead of cleaning bathroom surfaces daily or weekly
(depending on the location), Sharklet surfaces can be cleaned less
frequently, perhaps as infrequently as once every 90 days (the life
of a Sharklet strip) as a result of its bioinspired topography.
42 Specifying better
materials, surface
treatments, or structural
arrangements to protect
products from dirt,
corrosion, and wear
Sharklet protects the surface it is covering from bacteria by using
better structural arrangements of surface features that prevent
bacteria from adhering to – and growing on – the surface.
Table 30: The GDGs where it is unclear whether Sharklet or its competitor is
environmentally superior.
GDG # Guideline Why It is Unclear Which Design Meets Guideline Better
10 Ensuring that wastes are
water-based or
biodegradable
Sharklet still has to be cleaned with Clorox, just less, so the
wastes from Clorox are equally water-based/biodegradable
during use. We have no information on whether Sharklet is
water-based or biodegradable. This could be a way in which
Sharklet is worse.
25 Implementing reusable
supplies or ensuring the
maximum usefulness of
consumables
In one sense, consumable Sharklet strips can be used to keep
surfaces clean longer than just Clorox, and consequently could be
viewed as ‘ensuring maximum usefulness of consumables’.
However, this perspective may not be valid because the intent of
this guideline is most likely to compare two different quantities
of the same type of consumables. In the case of Sharklet,
however, we are comparing the usefulness of two different types
of consumables (a little Clorox with Sharklet strips vs. a lot of
Clorox). This is an apples to oranges comparison, and the
environmentally superior choice is unclear, but a significant
difference as a result of the bioinspired feature is likely to exist.
249
G.8 SHINKANSEN 500 SERIES NOSE CONE
Table 31: The GDGs met better by the Shinkansen nose cone than by its competitor.
GDG # Guideline Why Bioinspired Design Meets Guideline Better
8 Installing protection
against release of
pollutants and hazardous
substances
The kingfisher-inspired nose cone is designed to minimize noise
pollution.
28 Specifying best-in-class
energy efficiency
components
The reduced drag on the bioinspired nose cone results in
electricity savings, compared to the nose cone on the 300 Series
Shinkansen. Consequently, the 500 Series train with the
bioinspired nose cone uses less fuel to go the same distance as its
nonbioinspired competitor, meaning it is more energy efficient.
G.9 SHINKANSEN 500 SERIES PANTOGRAPH
Table 32: The GDGs met better by the Shinkansen pantograph than by its competitor.
GDG # Guideline Why Bioinspired Design Probably Meets Guideline Better
8 Installing protection
against release of
pollutants and hazardous
substances
The owl feather-inspired pantograph is designed to minimize
noise pollution.
28 Specifying best-in-class
energy efficiency
components
The reduced drag on the bioinspired pantograph results in
electricity savings, compared to the same pantograph with a
standard shape. Consequently, the train with the bioinspired
pantograph uses less fuel to go the same distance as its
nonbioinspired competitor, meaning it is more energy efficient.
250
Appendix H: Analysis of 9 Sustainable BIDs for Passive Mechanisms,
Multifunctional Designs, and Optimized Geometries
Nine sustainable BIDs were analyzed to identify passive mechanisms, multifunctional designs,
and optimized geometries. Justification for each determination of whether the keyword trend was present is
provided for each design, along with relevant quotations from other sources, in particular Wadia [63].,
which support this analysis.
H.1 BIOLYTIX
Table 33: Keyword Trends Analysis for Biolytix.
Keyword
Trend
Trend
Present? Justification
Passive
Mechanisms
Yes The Biolytix system filters and treats domestic waste water and solid
organic waste [293,356] passively [297], with “passive ventilation” and the
“passive transport” of waste through the system [296]. This occurs without
active cleaning of the filtration device [296] or the use of active chemical
inputs [360,361]. It uses gravity to transport material and the renewable
bioenergy in worms and insects to provide ventilation.
Multifunctional
Designs
No There is no reason to believe that Biolytix has multifunctional
characteristics as a result of its bioinspired feature.
Optimized
Geometries
No The decomposition process in nature is being mimicked, not any particular
geometry.
H.2 DAIMLER-CHRYSLER BIONIC CAR – SHAPE
Table 34: Keyword Trends Analysis for the Shape of the Bionic Car.
Keyword
Trend
Trend
Present? Justification
Passive
Mechanisms
No The shape of the bionic car does not use passive energy sources to perform
a function.
Multifunctional
Designs
No There is no reason to believe that the shape of the bionic car has
multifunctional characteristics as a result of its bioinspired feature.
Optimized
Geometries
Yes The streamlined shape of the car was inspired by the boxfish. Due in part to
its bioinspired shape, the air drag coefficient of the bionic car is 0.19,
which indicates that the car is exceptionally aerodynamic [41] compared to
the BMW 3 Series, which has a drag coefficient of 0.27 [369]. This
consequently reduces fuel consumption. The boxfish is a stable and energy
efficient swimmer because of the desirable vortices formed along its body
during swimming [39,40]. The optimized geometry was transferred from
biology to engineering, presumably with slight modifications. Wadia
agrees: “The shape of the car is optimized to reduce air drag coefficient
leading to higher efficiency” [63].
251
H.3 DAIMLER-CHRYSLER BIONIC CAR – STRUCTURE
Table 35: Keyword Trends Analysis for the Structure of the Bionic Car.
Keyword
Trend
Trend
Present? Justification
Passive
Mechanisms
No The structure of the bionic car does not use passive energy sources to
perform a function.
Multifunctional
Designs
No There is no reason to believe that the structure of the bionic car has
multifunctional characteristics as a result of its bioinspired feature.
Optimized
Geometries
No The structure of the bionic concept car is not inspired by a biological
geometry, but by a process of putting material in highly stressed areas, i.e.
an optimized structure. This structure does not directly imitate the structure
in bones, but the process of developing the optimized structure in the car
mimics the process of developing the optimized structure in bones.
H.4 EASTGATE CENTRE COOLING SYSTEM
Table 36: Keyword Trends Analysis for Eastgate Centre’s Cooling System.
Keyword
Trend
Trend
Present? Justification
Passive
Mechanisms
Yes The cooling system in Eastgate Centre is classified as passive in
architectural literature [31] because the layout of the building promotes the
rise of hot air through the chimneys and away from the building’s
inhabitants [34]. This cooling is fueled by the physical properties of fluid
flow and the structure of the building, eliminating the need for energy-
intensive air conditioning and reducing the energy consumption of the
building by approximately 50% [32]. An active cooling system would be a
traditional industrial air conditioner. Wadia agrees: “The concrete floors
serve as an energy source (passive cooling: thermal energy exchange with
air drawn from the exterior) in the termite mound inspired Eastgate
Building” [63].
Multifunctional
Designs
Yes Eastgate integrates the structure of the building with the building’s cooling
system, eliminating the need for an industrial air conditioner. The design of
Eastgate’s cooling system “incorporates a number of air shafts and voids,
integral with the structure which allows cool air to enter the building at its
base and warm air to discharge at roof level” [32]. Wadia agrees that
integration occurs in Eastgate Centre: “The Eastgate Complex integrates
the internal and external environments reducing the chances of system
failure” [63].
Optimized
Geometries
No Eastgate imitates the fluid flow in termite mounds, allowing for heat to rise
and cool air to enter the way termite mounds do. This is related to
mimicking the structure of termite mounds through chimneys, not
mimicking the actual geometry of the termite mounds.
252
H.5 INTERFACE FLOR I2 ENTROPY CARPET
Table 37: Keyword Trends Analysis for Entropy Carpet.
Keyword
Trend
Trend
Present? Justification
Passive
Mechanisms
No The artistic design of the carpet tiles does not use passive inputs to perform
a function.
Multifunctional
Designs
No There is no sense in which two components or systems are integrated in the
aesthetic design of the carpet that were not also integrated in the competing
design.
Optimized
Geometries
No The design of the bioinspired carpet tiles mimics color schemes and the
random visual pattern found on forest floors, not a shape or geometry.
H.6 SELF-CLEANING TRANSPARENT THIN FILM
Table 38: Keyword Trends Analysis for the Self-Cleaning Surface.
Keyword
Trend
Trend
Present? Justification
Passive
Mechanisms
Yes Gravity and the surface texture of the self-cleaning transparent thin film are
the inputs that allow cleaning to occur more passively than spray or
ultrasonic aqueous cleaning methods. While self-cleaning surfaces still
require a mist of water to be introduced, the cleaning process itself is more
passive than in alternative cleaning options; cleaning here happens with
less active energy and in response to the existing chemical conditions
inherent in the coating, instead of in response to the active dissolution of
dirt particles and the action of the pressurized water pushing the particles
off the surface.
Multifunctional
Designs
Yes The surface of the part itself and the cleaning mechanism are integrated in
the self-cleaning transparent thin film, allowing for the elimination of
additional cleaning modules. Liu and Jiang [328] discuss the lotus leaf as
an example of “biological materials with function integration,” saying that
it “Superhydrophobicity, low adhesion” and “self-cleaning” functions.
Optimized
Geometries
No The surface texture of the self-cleaning thin film allows water to bead up
because the contact angle is high. However, this texture does not mimic the
actual geometry of the lotus leaf.
253
H.7 SHARKLET ANTIMICROBIAL SURFACE
Table 39: Keyword Trends Analysis for Sharklet Antimicrobial.
Keyword
Trend
Trend
Present? Justification
Passive
Mechanisms
No Sharklet antimicrobial surface prevents bacteria growth through their shape.
However, the prevention of bacteria growth is not the same as containing a
mechanism for passive cleaning. Hence, Sharklet antimicrobial surface
does not contain a passive mechanism. This result may confusing to those
knowledgeable about Sharklet because Sharklet marine is described as
having a passive cleaning mechanism. According to one of the Sharklet
patents: “it has been proven through experimental testing that surface
topographies according to the invention provide a passive and nontoxic
surface, which through selection of appropriate feature sizes and spacing,
can significantly… reduce settlement and adhesion of the most common
marine algae known, as well as the settlement of barnacles” [266]. Sharklet
marine would act as a self-cleaning surface and would be passive for the
same reasons the self-cleaning transparent thin film is, but Sharklet
antimicrobial is not.
Multifunctional
Designs
No Sharklet antimicrobial is a bacteria-prevention module separate from the
door or surface where it would be applied. It is an additional module added
to the door and cleaning systems. While it reduces the amount of Clorox
required for cleaning, it is not multifunctional compared to the standard
door and cleaning system and does not reduce the number of modules or
components the system requires.
Optimized
Geometries
Yes Sharklet antimicrobial surfaces have geometries inspired by shark skin that
are optimized to prevent bioadhesion [396,266]. According to one of the
Sharklet patents: “the geometric shape and arrangement of individual
features of Sharklet was likely critical because it enhanced anti-settlement
effectiveness over topographies of equivalent dimensions” [266]. This
message is echoed in another Sharklet patent as well [396].
H.8 SHINKANSEN 500 SERIES NOSE CONE
Table 40: Keyword Trends Analysis for the Shinkansen 500 Series Nose Cone.
Keyword
Trend
Trend
Present? Justification
Passive
Mechanisms
No The geometry of the nose cone does not use passive inputs to perform a
function.
Multifunctional
Designs
No There is no sense in which components have been integrated in the
bioinspired design to produce more functional parts.
Optimized
Geometries
Yes The geometry of the kingfisher was transferred to the nose cone, making it
more aerodynamic, reducing drag, and ultimately saving energy. Wadia
agrees: “The nose’s optimized shape manipulates air flowing over it to
reduce air pressure accumulation” [63].
254
H.9 SHINKANSEN 500 SERIES PANTOGRAPH
Table 41: Keyword Trends Analysis for the Shinkansen 500 Series Pantograph.
Keyword
Trend
Trend
Present? Justification
Passive
Mechanisms
No The pantograph serrations do not use passive inputs to perform a function.
Multifunctional
Designs
No There is no sense in which components have been integrated in the
bioinspired design to produce more functional parts.
Optimized
Geometries
Yes The serrations on owl's feathers are mimicked geometrically in the
Shinkansen's pantograph. Wadia agrees: “The shape of the edges on the
pantograph is optimized to create smaller vortices in the airflow that in turn
help with noise regulation” [63]
255
References
[1]Schick, K. D. and N. Toth, 1993, Making Silent Stones Speak: Human Evolution and
the Dawn of Technology, Simon & Schuster, New York.
[2]May, R. M., J. H. Lawton and N. E. Stork, 1995, "Assessing Extinction Rates,"
Extinction Rates (J. H. Lawton and R. M. May, Eds.), Oxford University Press,
Oxford, pp. 1-24.
[3]Lodge, D. and K. Shrader-Frechette, 2003, “Nonindigenous Species: Ecological
Explanation, Environmental Ethics, and Public Policy,” Conservation Biology,
Vol. 17, No. 1, pp. 31-37.
[4]EPA, 1999, Considering Ecological Processes in Envionmental Impact Assessments,
United States Environmental Protection Agency (US EPA) Office of Federal
Activities.
[5]Chapin III, F. S., E. S. Zavaleta, V. T. Eviner, R. L. Naylor, P. M. Vitousek, H. L.
Reynolds, D. U. Hooper, S. Lavorel, O. E. Sala, S. E. Hobbie, M. C. Mack and S.
Diaz, 2000, “Consequences of Changing Biodiversity,” Nature, Vol. 405, pp.
234-242.
[6]The Earth Charter Initiative,2000, The Earth Charter.
[7]Wann, D., 1994, Biologic: Designing with Nature to Protect the Environment, Johnson
Books, Boulder, Colorado.
[8]Jones, C. G., J. H. Lawton and M. Shachak, 1994, “Organisms as Ecosystem
Engineers,” Oikos, Vol. 69, No. 3, pp. 373-386.
[9]Wikipedia,2012, Biomimicry. 2012, http://en.wikipedia.org/wiki/Biomimicry.
[10]Wikipedia,2012, Bionics. 2012, http://en.wikipedia.org/wiki/Bionics.
[11]Vincent, J. F. V., O. A. Bogatyreva, N. R. Bogatyrev, A. Bowyer and A.-K. Pahl,
2006, “Biomimetics: Its Practice and Theory,” Journal of the Royal Society
Interface, Vol. 3, pp. 471-482.
[12]Wilson, J. O. and D. Rosen, 2007, "Systematic Reverse Engineering of Biological
Systems," IDETC/CIE 2007, Las Vegas, Nevada, DETC2007-35395.
256
[13]Helms, M., A. Goel and S. Vattam, 2010, "The Effect of Functional Modeling on
Understanding Complex Biological Systems," IDETC/CIE 2010, Montreal,
Canada, DETC2010-28939.
[14]Nagel, J. K., 2010, "Systematic Design of Biologically-Inspired Engineering
Solutions," Mechanical Engineering, Oregon State University,
[15]Vollrath, F. and D. P. Knight, 2001, “Liquid Crystalline Spinning of Spider Silk,”
Nature, Vol. 410, pp. 541-548.
[16]Dabiri, J. O., S. P. Colin and J. H. Costello, 2006, “Fast-swimming Hydromedusae
Exploit Velar Kinematics to Form an Optimal Vortex Wake,” The Journal of
Experimental Biology, Vol. 209, pp. 2025-2033.
[17]Barthlott, W. and C. Neinhuis, 1997, “Purity of the Sacred Lotus, or Escape from
Contamination in Biological Surfaces,” Planta, Vol. 202, pp. 1-8.
[18]Raschi, W. and C. Tabit, 1992, “Functional Aspects of Placoid Scales: A Review and
Update,” Australian Journal of Marine and Freshwater Research, Vol. 43, pp.
123-147.
[19]North Shore City Government, ,Environmental Education. 2013,
http://www2.northshorecity.govt.nz/our_environment/Environmental_education/S
hopping_default.htm.
[20]Davies, C., 2006, Robot Gecko Wind Time Approval. 2013,
http://www.slashgear.com/robot-gecko-wins-time-approval-
072397/#entrycontent.
[21]Benyus, J. M., 1997, Biomimicry: Innovation Inspired by Nature, William Morrow
and Company, Inc., New York.
[22]Earthsky.org,2011, Biomimicry Offers Sustainable Solutions Inspired by Nature, Fast
Company. 2012, http://www.fastcompany.com/1734291/biomimicry-offers-
sustainable-solutions-inspired-by-nature.
[23]Merchant, B.,2011, How Biomimicry Drives Sustainability: From Fish-Inspired Wind
Turbines to the Future of 3-D Printing, Treehugger.com. 2012,
http://www.treehugger.com/clean-technology/how-biomimicry-drives-
sustainability-from-fish-inspired-wind-turbines-to-the-future-of-3-d-printing-
video.html.
257
[24]Moore, A. L., D. Gust and T. A. Moore, 2007, “Bio-inspired Constructs for
Sustainable Energy Production and Use,” L'Actualite Chimique, No. 308-309, pp.
50-56.
[25]Faure, E., P. Lecomte, S. Lenoir, C. Vreuls, C. V. D. Weerdt, C. Archambeau, J.
Martial, C. Jerome, A.-S. Duwez and C. Detrembleur, 2011, “Sustainable and
Bio-inspired Chemistry for Robust Antibacterial Activity of Stainless Steel,”
Journal of Materials Chemistry, Vol. 21, pp. 7901-7904.
[26]Evans, M.,2012, What is Biomimicry? Design Emulating Nature, About.com. 2012,
http://sustainability.about.com/od/GreenBuilding/a/What-Is-Biomimicry.htm.
[27]Raibeck, L., J. Reap and B. Bras, 2008, "Life Cycle Inventory Study of Biologically
Inspired Self-Cleaning Surfaces," ASME IDETC/CIE 2008, Brooklyn, New York,
DETC2008-49848.
[28]Reap, J., D. Baumeister and B. Bras, 2005, "Holism, Biomimicry and Sustainable
Engineering," ASME IMECE, Orlando, Florida, IMECE2005-81343.
[29]Jones, D. L., 1998, Architecture and the Environment: Bioclimatic Building Design,
The Overlook Press, Woodstock, New York.
[30]Baird, G., 2001 The Architectural Expression of Environmental Controls, Spon
Press, New York.
[31]Thomas, D., 2002, Architecture and the Urban Environment: A Vision for the New
Age, Architectural Press, Woburn, Massachusetts.
[32]Chown, M., 2003, "Building Simulation as an Aide to Design," Eighth International
IBPSA Conference, Eindhoven, Netherlands.
[33]Curriculum Vitae: Mick Pearce, Architects for Peace. 2011,
http://www.architectsforpeace.org/mickprofile.php.
[34]Turner, J. S. and R. C. Soar, 2008, "Beyond Biomimicry: What Termites Can Tell Us
About Realizing the Living Building," First International Conference on
Industrialized, Intelligent Construction (I3CON), Loughborough University.
[35]Biomimicry Institute,2010, Eastgate Centre Building, Ask Nature. 2010,
http://www.asknature.org/product/373ec79cd6dba791bc00ed32203706a1.
[36]California Air-Conditioning Systems, Inc. Lomita, CA. 2013,
http://www.californiaac.com/.
258
[37]Patterson, M.,2009, Eastgate Center, Ask Nature,
http://www.asknature.org/product/373ec79cd6dba791bc00ed32203706a1#change
Tab.
[38]Ask Nature,2013, Eastgate Centre Building. 2013, http://www.asknature.org/browse.
[39]Bartol, I. K., M. Gharib, P. W. Webb, D. Weihs and M. S. Gordon, 2005, “Body-
Induced Vortical Flows: A Common Mechanism for Self-Corrective Trimming
Control in Boxfishes,” The Journal of Experimental Biology, Vol. 208, pp. 327-
344.
[40]Choi, J.-g. and M. Kim, 2009, "The Usage and Evaluation of Anthropomorphic Form
in Robot Design," Undisciplined!: Design Research Society Conference,
Sheffield, United Kingdom.
[41]Thomer, K. W., 2007, "Materials and Concepts in Body Construction," Automotive
Paintings and Coatings (H.-J. Streitberger and K.-F. Dossel, Eds.), Wiley-VCH,
Weinheim, Germany, pp. 23-25.
[42]Nakajima, A., K. Hashimoto, T. Watanabe, K. Takai, G. Yamauchi and A. Fujishima,
2000, “Transparent Superhydrophobic Thin Films with Self-Cleaning Properties,”
Langmuir, Vol. 16, pp. 7044-7047.
[43]Raibeck, L., J. Reap and B. Bras, 2008, "Investigating Environmental Benefits of
Biologically Inspired Self-Cleaning Surfaces," 15th CIRP International
Conference on Life Cycle Engineering, Sydney, Australia.
[44]Srivathsan, A.,2006, Smart Materials and Self-Cleaning Bathrooms. The Hindu,
http://www.hindu.com/pp/2006/06/03/stories/2006060300360300.htm.
[45]2012, Ask Nature. 2012, http://www.asknature.org/strategy/714e970954253ace485ab
f1cee376ad8.
[46]ISO, ,2006, ISO 14040: Environmental Management - Life Cycle Assessment -
Principles and Framework, 2nd Edition. Geneva, Switzerland.
[47]ISO, 2007,"ISO Standards for Life Cycle Assessment to Promote Sustainable
Development," 2011, http://www.iso.org/iso/pressrelease.htm?refid=Ref1019.
[48]ISO.,2006, ISO 14044: Environmental Management - Life Cycle Assessment -
Requirements and Guidelines. Geneva, Switzerland.
259
[49]Reap, J., F. Roman, S. Duncan and B. Bras, 2008, “A Survey of Unresolved
Problems in Life Cycle Assessment: Part 1: Goal and Scope and Inventory
Analysis,” International Journal of Life Cycle Assessment, Vol. 13, pp. 290-300.
[50]Finnveden, G., 2000, “On the Limitations of Life Cycle Assessment and
Environmental Systems Analysis Tools in General,” International Journal of Life
Cycle Assessment, Vol. 5, No. 4, pp. 229-238.
[51]Jolliet, O., R. Muller-Wenk, J. Bare, A. Brent, M. Goedkoop, R. Heijungs, N. Itsubo,
C. Pena, D. Pennington, J. Potting, G. Rebitzer, M. Stewart, H. U. d. Haes and B.
Weidema, 2004, “The LCIA Midpoint-Damage Framework of the UNEP/SETAC
Life Cycle Initiative,” International Journal of Life Cycle Assessment, Vol. 9, No.
6, pp. 394-404.
[52]Nash, R. F., 1989, The Rights of Nature: A History of Environmental Ethics, The
University of Wisconsin Press, Madison, WI.
[53]Brennan, A. and Y.-S. Lo, 2011, "Environmental Ethics," Stanford Encyclopedia of
Philosophy (E. N. Zalta, Ed.).
[54]United Nations, 1992, Convention on Biological Diversity. 2012,
http://www.cbd.int/convention/text/.
[55]United Nations,1992, Report of the United Nations Conference on Environment and
Development: Rio Declaration on Environment and Development. Rio de Janeiro.
2012.
[56]UNESCO,1997, Declaration on the Responsibilities of the Present Generations
Towards Future Generations. Paris, UNESCO: Culture of Peace Programme.
[57]Millet, D., L. Bistangnino, C. Lanzavecchia, R. Camous and T. Poldma, 2007, “Does
the potential of the use of LCA match the team design needs?,” Journal of
Cleaner Production, Vol. 15, pp. 335-346.
[58]Lewis, H. and J. Gertsakis, 2001, Design + Environment: A Global Guide to
Designing Greener Goods, Greenleaf Publishing Limited, Sheffield.
[59]Sroufe, R., S. Curkovic, F. Montabon and S. A. Melnyk, 2000, “The New Product
Design Process and Design for Environment: Crossing the Chasm,” International
Journal of Operations and Production Management, Vol. 20, No. 2, pp. 267-291.
[60]Bhamra, T. A., S. Evans, T. C. McAloone, M. Simon, S. Poole and A. Sweatman,
1999, "Integrating Environmental Decisions into the Product Development
260
Process: Part1 The Early Stages," First International Symposium on
Environmentally Conscious Design and Inverse Manufacturing, Tokyo, IEEE.
[61]Telenko, C., 2009, "Developing Green Design Guidelines: A Formal Method and
Case Study," MS Thesis,Mechanical Engineering, University of Texas at Austin,
Austin, Texas.
[62]Wadia, A. P. and D. A. McAdams, 2010, "Developing Biomimetic Guidelines for the
Highly Optimized and Robust Design of Complex Products or Their
Counterparts," IDETC/CIE2010, Montreal, Canada, DETC2010-28708.
[63]Wadia, A. P., 2011, "Developing Biomimetic Design Principles for the Highly
Optimized and Robust Design of Products or Their Components," Mechanical
Engineering, Texas A&M University,
[64]Biomimicry Guild, 2009, Life's Principles, http://osbsustainablefuture.org/home/
section-newsletter/20101spring6isleleitch/.
[65]Biomimicry Group,2011, Life's Principles, http://bouncingideas.files.wordpress.com/
2012/01/lifes-principles.png.
[66]Biomimicry 3.8, 2012, Frequently Answered Q's. 2013,
http://biomimicry.net/about/biomimicry38/frequently-answered-qs/#faq12.
[67]Nagel, R. L., P. A. Midha, A. Tinsley, R. B. Stone, D. A. McAdams and L. H. Shu,
2008, “Exploring the Use of Functional Models in Biomimetic Conceptual
Design,” Journal of Mechanical Design, Vol. 130.
[68]Ball, P., 2001, “Life's Lessons in Design,” Nature, Vol. 409, pp. 413-416.
[69]Bar-Cohen, Y., 2006, "Introduction to Biomimetics: The Wealth of Inventions in
Nature as an Inspiration for Human Innovation," Biomimetics: Biologically
Inspired Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 1-
40.
[70]Hambourger, M., G. F. Moore, D. M. Kramer, D. Gust, A. L. Moore and T. A.
Moore, 2009, “Biology and Technology for Photochemical Fuel Production,”
Chemical Society Reviews Vol. 38, No. 1, pp. 25-35.
[71]Vincent, J. F. V., 2008, “Biomimetic Materials,” Journal of Materials Research, Vol.
23, No. 12, pp. 3140-3147.
261
[72]Bruck, H. A., A. L. Gershon, I. Golden, S. K. Gupta, L. S. G. Jr, E. B. Magrab and B.
W. Spranklin, 2007, “Training Mechanical Engineering Students to Utilize
Biological Inspiration During Product Development,” Bioinspiration and
Biomimetics, Vol. 2, No. 4, pp. S198-S209.
[73]Rey, A. D., D. Pasini and Y. K. Murugesan, 2012, "Multiscale Modeling of Plant
Cell Wall Architecture and Tissue Mechanics for Biomimetic Applications,"
Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 131-168.
[74]Papanek, V., 1984, "Chapter 8: The Tree of Knowledge: Biological Prototypes in
Design," Design for the Real World: Human Ecology and Social Change, Van
Nostrand Reinhold, New York, pp. 186-214.
[75]Nagel, J. K. S. and R. B. Stone, 2011, "A Systematic Approach to Biologically-
Inspired Engineering Design," ASME 2011 International Design Engineering and
Technical Conferences & Computers and Information in Engineering Conference,
Washington, DC, DETC2011-47398.
[76]Markman, A. B. and K. L. Wood, 2009, "The Cognitive Science of Innovation
Tools," Tools for Innovation (A. B. Markman and K. L. Wood, Eds.), Oxford
University Press, New York, NY, pp. 3-22.
[77]Shah, J. J., N. Vargas-Hernandez and S. M. Smith, 2003, “Metrics for Measuring
Ideation Effectiveness,” Design Studies, Vol. 24, pp. 111-134.
[78]Oman, S. K., I. Y. Tumer, K. Wood and C. Seepersad, 2012, “A Comparison of
Creativity and Innovation Metrics and Sample Validation Through In-Class
Design Projects,” Research in Engineering Design, pp. DOI 10.1007/s00163-012-
0138-9.
[79]Boden, M. A., 2004, The Creative Mind: Myths and Mechanisms, Routledge,
London.
[80]Wilson, J. O., D. Rosen, B. A. Nelson and J. Yen, 2010, “The Effects of Biological
Examples in Idea Generation,” Design Studies, Vol. 31, No. 2, pp. 169-186.
[81]Casakin, H. and G. Goldschmidt, 1999, “Expertise and the Use of Visual Analogy:
Implications for Design Education,” Design Studies, Vol. 20, pp. 153-175.
[82]Mak, T. W. and L. H. Shu, 2004, “Abstraction of Biological Analogies for Design,”
CIRP Annals - Manufacturing Technology, Vol. 53, No. 1, pp. 117-120.
262
[83]Chan, J., K. Fu, C. Schunn, J. Cagan, K. Wood and K. Kotovsky, 2011, “On the
Benefits and Pitfalls of Analogies for Innovative Design: Ideation Performance
Based on Analogical Distance, Commonness, and Modality of Examples,”
Journal of Mechanical Design, Vol. 133, No. 8, pp. 081004-1
[84]Lopez, R., J. S. Linsey and S. M. Smith, 2011, "Characterizing the Effect of Domain
Distance in Design-by-analogy," ASME 2011 International Design Engineering
Technical Conferences & Computers and Information in Engineering Conference,
Washington, DC, DETC2011-48428.
[85]Vattam, S. S., M. E. Helms and A. K. Goel, 2010, “A Content Account of Creative
Analogies in Biologically Inspired Design,” Artificial Intelligence for
Engineering Design, Analysis, and Manufacturing, Vol. 24, No. 4, pp. 467-481.
[86]Vincent, J. F. V. and D. L. Mann, 2002, “Systematic Technology Transfer from
Biology to Engineering,” Philosophical Transactions of the Royal Society A, Vol.
360, pp. 159-173.
[87]Price, S.,2000, Audacious & Outrageous: Space Elevators. Science News. T.
Phillips, National Aeronautics and Space Administration (NASA). 2012,
http://science.nasa.gov/science-news/science-at-nasa/2000/ast07sep_1/.
[88]Cheong, H., I. Chiu and L. H. Shu, 2010, "Extraction and Transfer of Biological
Analogies for Creative Concept Generation," IDETC/CIE 2010, Montreal,
Canada, DETC2010-29006.
[89]Mak, T. W. and L. H. Shu, 2004, "Use of Biological Phenomena in Design by
Analogy," ASME 2004 Design Engineering Technical Conferences and
Computers and Information in Engineering Conference, Salt Lake City, Utah,
USA, DETC2004-57303.
[90]Mak, T. W. and L. H. Shu, 2008, “Using Descriptions of Biological Phenomena for
Idea Generation,” Research in Engineering Design, Vol. 19, pp. 21-28.
[91]Dahl, D. W. and P. Moreau, 2002, “The Influence and Value of Analogical Thinking
During New Product Ideation,” Journal of Marketing Research, Vol. 39, No. 1,
pp. 47-60.
[92]Benami, O. and Y. Jin, 2002, "Creative Stimulation in Conceptual Design," ASME
2002 Design Engineering Technical Conferences and Computer and Information
in Engineering Conference, Montreal, Canada, DETC2002/DTM-34023.
263
[93]Christensen, B. T. and C. D. Schunn, 2007, “The Relationship of Analogical
Distance to Analogical Function and Preinventive Structure: The Case of
Engineering Design,” Memory & Cognition, Vol. 35, No. 1, pp. 29-38.
[94]Ke, J., I. Chiu, J. S. Wallace and L. H. Shu, 2010, "Supporting Biomimetic Design by
Embedding Metadata in Natural-Language Corpora," ASME IDETC/CIE 2010,
Montreal, Canada, DETC2010-29057.
[95]Fu, K., J. Chan, J. Cagan, K. Kotovsky, C. Schunn and K. Wood, 2012, "The
Meaning of 'Near' and 'Far': The Impact of Structuring Design Databases and the
Effect of Distance of Analogy on Design Output," IDECTC/CIE 2012, Chicago,
IL.
[96]Glier, M. W., D. A. McAdams and J. S. Linsey, 2011, "Concepts in Biomimetic
Design: Methods and Tools to Incorporate into a Biomimetic Design Course,"
ASME 2011 Design Engineering Technical Conferences & Computers and
Information in Engineering Conference, Washington, DC, DETC2011-48571.
[97]Nagel, J. K. S., R. B. Stone and D. A. McAdams, 2010, "Exploring the Use of
Category and Scale to Scope a Biological Functional Model," IDETC/CIE2010,
Montreal, Canada, DETC2010-28873.
[98]Trexler, M. and R. M. Deacon, 2012, "Artificial Senses and Organs: Natural
Mechanisms and Biomimetic Devices," Biomimetics: Nature-Based Innovation
(Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 35-93.
[99]Sadava, D., H. C. Heller, G. H. Orians, W. K. Purves and D. M. Hillis, 2008, Life:
The Science of Biology, Sinauer Associates, Inc., Sunderland, MA.
[100]Basalla, G., 1988, "Chapter 1: Diversity, Necessity, and Evolution," The Evolution
of Technology (G. Basalla and W. Coleman, Eds.), Cambridge University Press,
Cambridge, United Kingdom.
[101]Gorb, S. N., M. Sinha, A. Peressadko, K. A. Daltorio and R. D. Quinn, 2007,
“Insects Did It First: A Micropatterned Adhesive Tape for Robotic Applications,”
Bioinspiration and Biomimetics, Vol. 2, No. 4, pp. S117-S125.
[102]World Intellectual Property Organization, 2012, WIPO IP Statistics Data Center.
Geneva, Switzerland, United Nations. 2013,
http://ipstatsdb.wipo.org/ipstats/patentsSearch.
264
[103]Gorb, S. N., 2006, "Functional Surfaces in Biology: Mechanisms and Applications,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC
Press, Boca Raon, FL, pp. 381-397.
[104]Muller, R., J. Ma, Z. Yan, C. Grimm and W. Mio, 2011, "Bioinspiration from
Biodiversity in Sensor Design," International Mechanical Engineering Congress
& Exposition, Denver, Colorado, IMECE2011-64487.
[105]Barthelat, F., 2007, “Biomimetics for Next Generation Materials,” Philosophical
Transactions of the Royal Society A, Vol. 365, No. 1861, pp. 2907-2919.
[106]Zhang, S., H. Yokoi and X. Zhao, 2006, "Molecular Design of Biological and
Nano-Materials," Biomimetics: Biologically Inspired Technologies (Y. Bar-
Cohen, Ed.), CRC Press, Boca Raton, FL pp. 229-242.
[107]Thomas, D. N. and G. S. Dieckmann, 2002, “Antartic Sea Ice - A Habitat for
Extremophiles,” Science, Vol. 295, pp. 641-644.
[108]Stetter, K. O., 1999, “Extremophiles and Their Adaptation to Hot Environments,”
FEBS Letters, Vol. 452, pp. 22-25.
[109]Nies, D. H., 2000, “Heavy Metal-Resistant Bacteria as Extremophiles: Molecular
Physiology and Biotechnological Use of Ralstonia sp. CH34,” Extremophiles,
Vol. 4, pp. 77-82.
[110]Lee, D. W., 2012, "Biomimicry of the Ultimate Optical Device - The Plant,"
Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 307-330.
[111]Argunsah, H. and B. L. Davis, 2012, "Application of Biomimetics in the Design of
Medical Devices," Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.),
CRC Press, Boca Raton, FL, pp. 445-459.
[112]Gebeshuber, I. C., B. Y. Majlis and H. Stachelberger, 2009, “Tribology in Biology:
Biomimetic Studies Across Dimensions and Across Fields,” International Journal
of Mechanical and Materials Engineering, Vol. 4, No. 3, pp. 321-327.
[113]Dickinson, M. H., 1999, “Bionics: Biological Insight into Mechanical Design,”
PNAS: Proceedings of the National Academy of Sciences, Vol. 96, No. 25, pp.
14208-14209.
[114]Chiu, I. and L. H. Shu, 2007, “Biomimetic Design Through Natual Language
Analysis to Facilitate Cross-Domain Information Retrieval,” Artificial
265
Intelligence for Engineering Design, Analysis, and Manufacturing, Vol. 21, pp.
45-59.
[115]Cheong, H., I. Chiu, L. H. Shu, R. B. Stone and D. A. McAdams, 2011,
“Biologically Meaningful Keywords for Functional Terms of the Functional
Basis,” Journal of Mechanical Design, Vol. 133, No. 2, pp. 021007-1.
[116]Vogel, S., 1998, Cats' Paws and Catapults: Mechanical Worlds of Nature and
People, W.W. Norton & Company, New York.
[117]Solga, A., Z. Cerman, B. F. Striffler, M. Spaeth and W. Barthlott, 2007, “The
Dream of Staying Clean: Lotus and Biomimetic Structures,” Bioinspiration and
Biomimetics, Vol. 2, No. 4, pp. S126-S134.
[118]Hanson, D., 2006, "Robotic Biomimesis of Intelligent Mobility, Manipulation, and
Expression," Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen,
Ed.), CRC Press, Boca Raton, FL, pp. 177-200.
[119]Nagel, J. K. S., R. L. Nagel, R. B. Stone and D. A. McAdams, 2010, “Function-
Based, Biologically Inspired Concept Generation,” Artificial Intelligence for
Engineering Design, Analysis, and Manufacturing, Vol. 24, No. 04, pp. 521-535.
[120]Harris, C. M., 2009, “Biomimetics of Human Movement: Functional or Aesthetic?,”
Bioinspiration and Biomimetics, Vol. 4, No. 3, pp. 033001.
[121]Abdel-Aal, H. A. and M. E. Mansori, 2011, "Chapter 4: Reptilian Skin as a
Biomimetic Analogue for the Design of Deterministic " Biomimetics - Materials,
Structures and Processes (P. Gruber, D. Bruckner, C. Hellmichet al, Eds.),
Springer, New York, NY, pp. 51-79.
[122]Frankel, R. B. and D. A. Bazylinski, 1995, "Structure and Function of
Magnetosomes in Magnetotactic Bacteria," Biomimetics: Design and Processing
of Materials (M. Sarikaya and I. A. Aksay, Eds.), AIP Press, Woodbury, New
York, pp. 199-215.
[123]Beheshti, N. and A. C. Mcintosh, 2007, “The Bombardier Beetle and Its Use of a
Pressure Relief Valve System to Deliver a Periodic Pulsed Spray,” Bioinspiration
and Biomimetics, Vol. 2, No. 4, pp. 57-64.
[124]Kulfan, B. M. and A. J. Colozza, 2012, "Biomimetics and Flying Technology,"
Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 525-674.
266
[125]Nemat-Nasser, S., S. Nemat-Nasser, T. Plaisted, A. Starr and A. V. Amirkhizi,
2006, "Mulitfunctional Materials," Biomimetics: Biologically Inspired
Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 309-340.
[126]Leonor, I. B., H. S. Azevedo, I. Pahkuleva, A. L. Oliveira, C. M. Alves and R. L.
Reis, 2004, "Learning from Nature How to Design Biomimetic Calcium-
Phosphate Coatings," Learning from Nature How to Design New Implantable
Biomaterials: From Biomineralization Fundamental to Biomimetic Materials and
Processing Routes (R. L. Reis and S. Weiner, Eds.), Kluwer Academic
Publishers, Dordrecht, The Netherlands, Vol. 171, pp. 123-150.
[127]Bar-Cohen, Y., 2006, “Biomimetics - Using Nature to Inspire Human Innovation,”
Bioinspiration and Biomimetics, Vol. 1, pp. P1-P12.
[128]Fong, D. W., T. C. Kane and D. C. Culver, 1995, “Vestigialization and Loss of
Nonfunctional Characters,” Annual Review of Ecology and Systematics, Vol. 26,
pp. 249-268.
[129]Bejder, L. and B. K. Hall, 2002, “Limbs in Whales and Limblessness in Other
Vertebrates: Mechanisms of Evolutionary and Developmental Transformation and
Loss,” Evolution and Development, Vol. 4, No. 6, pp. 445-458.
[130]Goodwin, B., 2009, "Beyond the Darwinian Pardigm: Understanding Biological
Forms," Evolution: The First Four Billion Years (M. Ruse and J. Travis, Eds.),
The Belknap Press of Harvard University Press, Cambridge, MA, pp. 299-312.
[131]Starr, C., C. A. Evers and L. Starr, 2006, Basic Concepts in Biology, Thomson
Brooks/Cole, Belmont, CA.
[132]Travis, J. and D. N. Reznick, 2009, "Adaptation," Evolution: The First Four Billion
Years (M. Ruse and J. Travis, Eds.), The Belknap Press of Harvard University
Press, Cambridge, MA, pp. 105-131.
[133]Campbell, N. A. and J. B. Reece, 2005, Biology, Pearson Benjamin Cummings, San
Francisco.
[134]Drezner, T. and Z. Drezner, 2006, "Genetic Algorithms: Mimicking Evolution and
Natural Selection in Optimization Models," Biomimetics: Biologically Inspired
Technologies (Y. Bar-Cohen, Ed.), CRC Press Boca Raton, FL, pp. 157-175.
[135]Ausubel, K., 2004, "Introduction," Nature's Operating Instructions: The True
Biotechnologies (K. Ausubel and J. P. Harpignies, Eds.), Sierra Club Books, San
Francisco.
267
[136]Richter, K. and I. Grunwald, 2010, "Bio-inspired Polyphenolic Adhesives for
Medical and Technical Applications: Introduction," Biological Adhesive Systems:
From Nature to Technical and Medical Application (J. v. Byern and I. Grunwald,
Eds.), Springer-Verlang/Wien, Austria, pp. 201-202.
[137]Yen, J., M. J. Weissburg, M. Helms and A. K. Goel, 2012, "Biologically Inspired
Design: A Tool for Interdisciplinary Education," Biomimetics: Nature-Based
Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 331-360.
[138]Peterson, A. T., J. Soberon, R. G. Pearson, R. P. Anderson, E. Martinez-Meyer, M.
Nakamura and M. B. Araujo, 2011, "Chapter 2: Concepts of Niches," Ecological
Niches and Geographic Distributions, Princeton University Press, Princeton, New
Jersey, pp. 7-22.
[139]Gunderson, S. L. and R. C. Schiavone, 1995, "Microstructure of an Insect Cuticle
and Applications to Advanced Composites," Biomimetics: Design and Processing
of Materials (M. Sarikaya and I. A. Aksay, Eds.), AIP Press, Woodbury, New
York, pp. 163-197.
[140]Houde, A. E., 1987, “Mate Choice Based Upon Naturally Occurring Color-Pattern
Variation in a Guppy Population,” Evolution, Vol. 41, No. 1, pp. 1-10.
[141]Walther, B. A., 2003, “Do Peacocks Devote Maintenance Time to Their Ornamental
Plumage? Time Budgets of Male Blue Peafoul Pavo cristatus,” Ludiana, Vol. 4,
No. 2, pp. 149-154.
[142]Schluter, D., T. D. Price and L. Rowe, 1991, “Conflicting Selection Pressures and
Life History Trade-Offs,” Proceedings of the Royal Society B: Biological
Sciences, Vol. 246, No. 1315, pp. 11-17.
[143]Andersson, M., 1994, Sexual Selection, Princeton University Press, Princeton, NJ.
[144]Helms, M., S. S. Vattam and A. K. Goel, 2009, “Biologically Inspired Design:
Process and Products,” Design Studies, Vol. 30, No. 5, pp. 606-622.
[145]Lynch, M., 2007, “The Frailty of Adaptive Hypotheses for the Origins of
Organismal Complexity,” PNAS: Proceedings of the National Academy of
Sciences, Vol. 104, No. 1, pp. 8597-8604.
[146]Charlesworth, B. and D. Charlesworth, 2009, "Evolution of the Genome,"
Evolution: The First Four Billion Years (M. Ruse and J. Travis, Eds.), The
Belknap Press of Harvard University Press, Cambridge, MA, pp. 152 - 176.
268
[147]Barton, N. and L. Partridge, 2000, “Limits to Natural Selection,” BioEssays, Vol.
22, pp. 1075-1084.
[148]Stoltzfus, A. and L. Y. Yampolsky, 2009, “Climbing Mount Probable: Mutation as a
Cause of Nonrandomness in Evolution,” Journal of Heredity, Vol. 100, No. 5, pp.
637-647.
[149]Hodgkinson, A. and A. Eyre-Walker, 2011, “Variation in the Mutation Rate Across
Mammalian Genomes,” Nature Reviews, Vol. 12, pp. 756-766.
[150]Barton, N. H., 2000, “Genetic Hitchhiking,” Philosophical Transactions of the
Royal Society B, Vol. 355, pp. 1553-1562.
[151]Meiklejohn, C. D., K. L. Montooth and D. M. Rand, 2000, “Positive and Negative
Selection on the Mitochondrial Genome,” TRENDS in Genetics, Vol. 23, No. 6,
pp. 259-263.
[152]Knippers, J. and T. Speck, 2012, “Design and Construction Principles in Nature and
Architecture,” Bioinspiration and Biomimetics, Vol. 7, No. 1, pp. 015002.
[153]Reznick, D. N. and R. E. Recklefs, 2009, “Darwin's Bridge Between
Microevolution and Macroevolution,” Nature, Vol. 457, pp. 837-842.
[154]Bar-Cohen, Y., 2012, "Introduction: Nature as a Source of Inspiring Innovation,"
Biomimetics:Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 1-34.
[155]Hobaek, T. C., K. G. Leinan, H. P. Linaas and C. Thaulow, 2011, “Surface
Nanoengineering Inspired by Evolution,” BioNanoScience, Vol. 1, No. 3, pp. 63-
77.
[156]Langella, C., 2006, "Hybrid Design. Encoding Biological Principles in Sustainable
Design," Sustainable Consumption and Production: Opportunities and
Challenges, Wuppertal, Germany.
[157]Payne, J. L. and S. Finnegan, 2007, “The Effect of Geographic Range on the
Extinction Risk During Background and Mass Extinction,” PNAS: Proceedings of
the National Academy of Sciences, Vol. 104, No. 25, pp. 10506-10511.
[158]Fusco, G. and A. Minelli, 2010, “Phenotypic Plasticity in Development and
Evolution: Facts and Concepts,” Philosophical Transactions of the Royal Society
B, Vol. 365, pp. 547-556.
269
[159]Agrawal, A. A.,2001, Phenotypic Plasticity in the Interaction and Evolution of
Species. Science. 294: 321-326.
[160]Boratynski, Z., E. Koskela, T. Mappes and T. A. Oksanen, 2010, “Sex-Specific
Selection on Energy Metabolism - Selection Coefficients for Winter Survival,”
Journal of Evolutionary Biology, Vol. 23, pp. 1969-1978.
[161]Sengupta, B., M. Stemmler, S. B. Laughlin and J. E. Niven, 2010, “Action Potential
Energy Efficiency Varies Among Neuron Types in Vertebrates and
Invertebrates,” PLoS Computational Biology, No. 7, pp. e1000840.
[162]Niven, J. E. and S. B. Laughlin, 2008, “Energy Limitation as a Selective Pressure
on the Evolution of Sensory Systems,” The Journal of Experimental Biology, Vol.
211, pp. 1792-1804.
[163]Ruxton, G. D. and D. M. Wilkinson, 2011, “The Energetics of Low Browsing in
Sauropods,” Biology Letters, Vol. 7, pp. 779-781.
[164]Barber, J., 2009, “Photosynthetic Energy Conversion: Natural and Artificial,”
Chemical Society Reviews, Vol. 38, pp. 185-196.
[165]Gee, H., R. Howlett and P. Campbell, 2009, “15 Evolutionary Gems,” Nature, pp.
doi:10.1038/nature07740.
[166]Ayala, F. J., 2009, "Molecular Evolution," Evolution: The First Four Billion Years
(M. Ruse and J. Travis, Eds.), The Belknoap Press of Harvard University Press,
Cambridge, MA, pp. 132 -151.
[167]Green, M. S., 2006, Engaging Philosophy: A Brief Introduction, Hackett Publishing
Company, Indianapolis.
[168]Salmon, M. H., 2007, Introduction to Logic and Critical Thinking, Cengage
Learning, Belmont, CA.
[169]World Commission on the Ethics of Scientific Knowledge and Technology,2010,
The Ethical Implications of Global Climate Change. Paris, France, United
Nations Educational, Scientific and Cultural Organization (UNESCO): 7-39.
[170]United Nations, 1998, Kyoto Protocol to the United Nations Framework Convention
on Climate Change.
270
[171]Haas, G., F. Wetterich and U. Kopke, 2001, “Comparing Intensive, Extensified and
Organic Grassland farming in Southern Germany by Process Life Cycle
Assessment,” Agriculture, Ecosystems & Environment, Vol. 83, No. 1-2, pp. 43-
53.
[172]Aubin, J., E. Papatryphon, H. M. G. v. d. Werf and S. Chatzifotis, 2009,
“Assessment of the Environmental Impact of Carnivorous Finfish Production
Systems Using Life Cycle Assessment,” Journal of Cleaner Production, Vol. 17,
No. 3, pp. 354-361.
[173]Rotz, C. A., F. Montes and D. S. Chianese, 2010, “The Carbon Footprint of Dairy
Production Systems Through Partial Life Cycle Assessment,” Journal of Dairy
Science, Vol. 93, No. 3, pp. 1266-1286.
[174]Peters, G. M., H. V. Rowley, S. Wiedemann, R. Tucker, M. D. Short and M. Schulz,
2010, “Red Meat Production in Australia: Life Cycle Assessment and
Comparison with Overseas Studies,” Environmental Science & Technology, Vol.
44, No. 4, pp. 1327-1332.
[175]Kim, S., B. E. Dale and R. Jenkins, 2009, “Life Cycle Assessment of Corn Grain
and Corn Stover in the United States,” International Journal of Life Cycle
Assessment, Vol. 14, No. 2, pp. 160-174.
[176]Pimentel, D. and T. W. Patzek, 2005, “Ethanol Production Using Corn,
Switchgrass, and Wood; Biodiesel Production Using Soybean and Sunflower,”
Natural Resources Research, Vol. 14, No. 1, pp. 65-76.
[177]Lardon, L., A. Helias, B. Sialve, J.-P. Seyer and O. Bernard, 2009, “Life-Cycle
Assessment of Biodiesel Production from Microalgae,” Environmental Science &
Technology, Vol. 43, No. 17, pp. 6475-6481.
[178]Mooney, H. A. and R. J. Hobbs, 2000, "Introduction," Invasive Species in a
Changing World (H. A. Mooney and R. J. Hobbs, Eds.), Island Press,
Washington, DC.
[179]Lee, C. E., 2002, “Evolutionary Genetics of Invasive Species,” Trends in Ecology &
Evolution, Vol. 17, No. 8, pp. 386-391.
[180]Crooks, J. A., 2002, “Characterizing Ecosystem-Level Consequences of Biological
Invasions: The Role of Ecosystem Engineers,” Oikos, Vol. 97, pp. 153-166.
271
[181]Pimentel, D., R. Zuniga and D. Morrison, 2005, “Update on the Environmental and
Economic Costs Associated with Alien-Invasive Species in the United States,”
Ecological Economics, Vol. 52, No. 3, pp. 273-288.
[182]National Resource Management Ministerial Council - Vertebrate Pests Committee,
2010, National Feral Camel Action Plan: A National Strategy for the
Management of Feral Camels in Australia. Barton, Australian Capital Territory,
Commonwealth of Australia, http://www.environment.gov.au/biodiversity/
invasive/publications/pubs/feral-camel-action-plan.pdf
[183]Clark, P.,2011, Australia Poised to Allow Camel Cull. The Financial Times.
London.
[184]Coleman, F. C. and S. L. Williams, 2002, “Overexploiting Marine Ecosystem
Engineers: Potential Consequences for Biodiversity,” Trends in Ecology &
Evolution, Vol. 17, No. 1, pp. 40-44.
[185]Jones, C. G., J. H. Lawton and M. Shachak, 1997, “Positive and Negative Effects of
Organisms as Physical Ecosystem Engineers,” Ecology, Vol. 78, No. 7, pp. 1946-
1957.
[186]Wilkinson, D. M., E. G. Nisbet and G. D. Ruxton, 2012, “Could Methane Produced
by Sauropod Dinosaurs Have Helped Drive Mesozoic Climate Warmth?,”
Current Biology, Vol. 22, No. 9, pp. R292-R293.
[187]Benyus, J., 2004, "Biomimicry: What Would Nature Do Here?," Nature's Operating
Instructions: The True Biotechnologies (K. Ausubel and J. P. Harpignies, Eds.),
Sierra Club Books, San Francisco.
[188]Turney, T., 2009, "Future Materials and Performance," Technology, Design and
Process Innovation in the Built Environment (P. Newton, K. Hampson and R.
Drogemuller, Eds.), Taylor & Francis, New York, pp. 31-53.
[189]Bar-Cohen, Y., 2006, "Biomimetics: Reality, Challenges, and Outlook,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC
Press, Boca Raton, FL, pp. 495-513.
[190]Bar-Cohen, Y., 2012, "Biomimetics - Reality, Challenges, and Outlook,"
Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca
Raton, FL, pp. 693-714.
[191]Golley, F. B., 1960, “Energy Dynamics of a Food Chain of an Old-Field
Community,” Ecological Monographs, Vol. 30, No. 2, pp. 187-206.
272
[192]Yakimov, M. M., K. N. Timmis and P. N. Golyshin, 2007, “Obligate Oil-Degrading
Marine Bacteria,” Current Opinion in Biotechnology, Vol. 18, pp. 257-266.
[193]Pavlik, B. M. and E. Manning, 1993, “Assessing Limitations on the Growth of
Endangered Plant Populations, II. Seed Production and Seed Bank Dynamics of
Erysimum capitatum ssp. Angustatum and Oenothera deltoides ssp. Howellii,”
Biological Conservation, Vol. 65, No. 3, pp. 267-278.
[194]Wolpert, H. D., 2012, "Biological Optics," Biomimetics: Nature-Based Innovation
(Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 267-305.
[195]Kalaitzis, J. A., R. Chau, G. S. Kohli, S. A. Murray and B. A. Neilman, 2012,
“Biosynthesis of Toxic Naturally-Occuring Seafood Contaminants,” Toxicon,
Vol. 56, No. 2, pp. 244-258.
[196]Ferrao-Filho, A. S., S. M. F. O. Azevedo and W. R. DeMott, 2000, “Effects of
Toxic and Non-Toxic Cyanobacteria on the Life History of Tropical and
Temperate Cladocerans,” Freshwater Biology, Vol. 45, pp. 1-19.
[197]Mendoza, E. and R. Dirzo, 2009, “Seed Tolerance to Predation: Evidence from the
Toxic Seeds of the Buckeye Tree (Aesculus californica; Sapindaceae),” American
Journal of Botany, Vol. 96, No. 7, pp. 1255-1261.
[198]Akhtar, Y., M. B. Isman, L. A. Niehaus, C.-H. Lee and H.-S. Lee, 2012,
“Antifeedant and Toxic Effects of Naturally Occuring and Synthetic Quinones to
the Cabbage Looper, Trichoplusia ni,” Crop Protection, Vol. 31, No. 1, pp. 8-14.
[199]Gibbs, H. L. and S. P. Mackessy, 2009, “Functional Basis of a Molecular
Adaptation: Prey-Specific Toxic Effects of Venom from Sistrurus Rattlesnakes,”
Toxicon, Vol. 53, No. 6, pp. 672-679.
[200]Price, D. R. G., H. A. Bell, G. Hinchliffe, E. Fitches, R. Weaver and J. A.
Gatehouse, 2009, “A Venom Metalloproteinase from the Parasitic Wasp Eulophus
pennicornis is toxic towards its host, tomato moth (Lacanobia oleracae),” Insect
Molecular Biology, Vol. 18, No. 2, pp. 195-202.
[201]Wainwright, S. A., 1995, "What We Can Learn from Soft Biomaterials and
Structures," Biomimetics: Design and Processing of Materials (M. Sarikaya and I.
A. Aksay, Eds.), AIP Press, Woodbury, New York, pp. 1-12.
273
[202]Strange, D. G. T. and M. L. Oyen, 2012, "Biomimetic Composites," Biomimetics:
Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp.
169-212.
[203]Biello, D.,2008, Cement from CO2: A Concrete Cure for Global Warming?
Scientific American, http://www.scientificamerican.com/article.cfm?id=cement-
from-carbon-dioxide.
[204]Feng, S. and R. Xu, 2001, “New Materials in Hydrothermal Synthesis,” Accounts of
Chemical Research, Vol. 34, No. 3, pp. 239-247.
[205]Kato, C. and Y. Nogi, 2001, “Correlation Between Phylogenetic Structure and
Function: Examples from Deep-Sea Shewanella,” FEMS Microbiology Ecology,
Vol. 35, pp. 223-230.
[206]Abe, F. and K. Horikoshi, 2001, “The Biotechnological Potential of Piezophiles,”
TRENDS in Biotechnology Vol. 19, No. 3, pp. 102-108.
[207]Yayanos, A. A., R. V. Boxtel and A. S. Dietz, 1983, “Reproduction of Bacillus
stearothermophilus as a Function of Temperature and Pressure,” Applied and
Environmental Microbiology, Vol. 46, No. 6, pp. 1357-1363.
[208]Wainwright, S. A., W. D. Biggs, J. D. Currey and J. M. Gosline, 1976, Mechanical
Design in Organisms, John Wiley & Sons, Inc., New York.
[209]Paturi, F. R., 1976, "Chapter 16: Where Do We Go from Here?," Nature: Mother of
Invention: The Engineering of Plant Life, Harper & Row, New York, NY, pp.
199-203.
[210]Crutzen, P. J., I. Aselmann and W. Seiler, 1986, “Methane Production by Domestic
Animals, Wild Ruminants, Other Herbivorous Fauna, and Humans,” Tellus, Vol.
38B, pp. 271-284.
[211]Parveen, S., K. M. Portier, K. Robinson, L. Edmiston and M. L. Tamplin, 1999,
“Discriminant Analysis of Ribotype Profiles of Escherichia coli for
Differentiating Human and Nonhuman Sources of Fecal Pollution,” Applied and
Environmental Microbiology, Vol. 65, No. 7, pp. 3142-3147.
[212]Geldreich, E. E. and B. A. Kenner, 1969, “Concepts of Fecal Streptococci in Stream
Pollution,” Water Pollution Control Federation, Vol. 41, No. 8, pp. R336-R352.
[213]Liu, C., 2007, “Micromachined Biomimetic Artificial Haircell Sensors,”
Bioinspiration and Biomimetics, Vol. 2, No. 4, pp. S162-S169.
274
[214]Fotheringham, N., 1976, “Population Consequences of Shell Utilization by Hermit
Crabs,” Ecology, Vol. 57, No. 3, pp. 570-578.
[215]Department of Energy, 2013, How Fossil Fuels Were Formed. Washington, D.C.
2013,
http://www.fossil.energy.gov/education/energylessons/coal/gen_howformed.html.
[216]Bond, W. J. and J. E. Keeley, 2005, “Fire as a Global 'Herbivore': The Ecology and
Evolution of Flammable Ecosystems,” Trends in Ecology & Evolution, Vol. 20,
No. 7, pp. 387-394.
[217]Ennos, A. R., 2005, "Compliance in Plants," Compliant Stuctures in Nature and
Engineering (C. H. M. Jenkins, Ed.), WIT Press, Billerica, MA, pp. 21-37.
[218]Hughes, T. P., A. H. Baird, D. R. Bellwood, M. Card, S. R. Connolly, C. Folke, R.
Grosberg, O. Hoegh-Guldberg, J. B. C. Jackson, J. Kleypas, J. M. Lough, P.
Marshall, M. Nystrom, S. R. Palumbi, J. M. Pandolfi, B. Rosen and J.
Roughgarden, 2003, “Climate Change, Human Impacts, and the Resilience of
Coral Reefs,” Science, Vol. 301, pp. 929-933.
[219]Dennis, R. G. and H. Herr, 2006, "Engineered Muscle Actuators: Cells and
Tissues," Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.),
CRC Press, Boca Raton, FL, pp. 243-266.
[220]Otero, T., 2008, “Reactive Conducting Polymers as Actuating Sensors and Tactile
Muscle,” Bioinspiration and Biomimetics, Vol. 3, No. 3, pp. 035004.
[221]Tester, J. W., E. M. Drake, M. J. Driscoll, M. W. Golay and W. A. Peters, 2005,
Sustainable Energy: Choosing Among Options, MIT Press, Cambridge, MA.
[222]French, M., 1994, Invention and Evolution: Design in Nature and Engineering,
Cambridge University Press, New York.
[223]Smil, V., 1999, Energies: An Illustrated Guide to the Biosphere and Civilization,
MIT Press, Cambridge, MA.
[224]Weber, P. W., M. M. Murray, L. E. Howle and F. E. Fish, 2009, “Comparison of
Real and Idealized Cetacean Flippers,” Bioinspiration and Biomimetics, Vol. 4,
No. 4, pp. 046001.
275
[225]Vargas, A., R. Mittal and H. Dong, 2008, “A Computational Study of the
Aerodynamic Performance of a Dragonfly Wing Section Gliding in Flight,” 2008,
Vol. 3, No. 2, pp. 026004.
[226]Bhushan, B., 2012, Biomimetics: Bioinspired Hierarchial-Structured Surfaces for
Green Science and Technology, Springer, New York.
[227]Vincent, J., 2009, “Biomimetics - A Review,” Proceedings of the Institution of
Mechanical Engineers, Part H: Journal of Engineering and Medicine, Vol. 223,
No. 8, pp. 919-939.
[228]Anastas, P. T. and J. C. Warner, 1998, "Future Trends in Green Chemistry," Green
Chemistry: Theory and Practice, Oxford University Press, Oxford, pp. 115-119.
[229]Stachelberger, H., P. Gruber and I. C. Gebeshuber, 2011, "Biomimetics: Its
Technological and Societal Potential," Biomimetics - Materials, Structures and
Processes (P. Gruber, D. Bruckner, C. Hellmichet al, Eds.), Springer, New York.
[230]Gruber, P., 2011, "Biomimetics in Architecture [Architekturbionik]," Biomimetics -
Materials, Structures and Processes (P. Gruber, D. Bruckner, C. Hellmichet al,
Eds.), Springer, New York, NY, pp. 127-148.
[231]Vogel, S., 2009, “Nosehouse: Heat-Conserving Ventilators Based on Nasal
Counterflow Exchangers,” Bioinspiration and Biomimetics, Vol. 4, No. 4, pp.
046004.
[232]Velcro,2011, Who is Velcro USA Inc.? 2012,
http://www.velcro.com/index.php?page=company.
[233]Vattam, S., B. Wiltgen, M. Helms, A. K. Goel and J. Yen, 2011, "DANE: Fostering
Creativity in and through Biologically Inspired Design," Design Creativity 2010
(T. Taura and Y. Nagai, Eds.), Springer-Verlag London Limited, pp. 115-122.
[234]Nagel, J. K. S., R. B. Stone and D. A. McAdams, 2010, "An Engineering-to-
Biology Thesaurus for Engineering Design," ASME IDETC/CIE 2010, Montreal,
Canada, DETC2010-28233.
[235]Turner, C. H., 2006, “Bone Strength: Current Concepts,” Annals of the New York
Academy of Sciences, Vol. 1068, No. 1, pp. 429-446.
[236]Weinkamer, R. and P. Fratzl, 2011, “Mechanical Adaptation of Biological Materials
- The Examples of Bone and Wood,” Materials Science and Engineering C, Vol.
31, pp. 1164-1173.
276
[237]Muller, R. and R. Kuc, 2007, “Biosonar-Inspired Technology: Goals, Challenges
and Insights,” Bioinspiration and Biomimetics, Vol. 2, No. 4, pp. S146-S161.
[238]Sullivan, T. and F. Regan, 2011, “The Characterization, Replication and Testing of
Dermal Denticles of Scyliorhinus canicula for Physical Mechanisms of
Biofouling Prevention,” Bioinspiration and Biomimetics, Vol. 6, No. 4, pp. 1-11.
[239]Masselter, T., G. Bauer, F. Gallenmuller, T. Haushahn, S. Poppinga, C. Schmitt, R.
Seidel, O. Speck, M. Thielen, T. Speck, W. Barthlott, P. Ditsche-Kuru, H.
Immink, J. Bertling, N. Molders, A. Nellesen, M. Rechberger, F. Cichy, M. Gude,
M. Hermann, K. Lunz, J. Knippers, J. Lienhard, S. Schleicher, R. Luchsinger, C.
Mattheck, I. Tesari, M. Milwich, T. Stegmaier, C. Neinhuis and H. Schwager,
2012, "Biomimetic Products," Biomimetics: Nature-Based Innovation (Y. Bar-
Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 377-429.
[240]Lipson, H., 2006, "Evolutionary Robotics and Open-Ended Design Automation,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC
Press, Boca Raton, FL, pp. 129-153.
[241]Nelson, R. A., J. G. Edgar Folk, E. W. Pfeiffer, J. J. Craighead, C. J. Jonkel and D.
L. Steiger, 1983, "Behavior, Biochemistry, and Hibernation in Black, Grizzly, and
Polar Bears," Fifth International Conference on Bear Research and Management,
Madison, Wisconsin.
[242]Lowe, S., M. Browne, S. Boudjelas and M. D. Poorter,2000, 100 of the World's
Worst Invasive Alien Species: A Selection from the Global Invasive Species
Database. Auckland, New Zealand, The Invasive Species Specialist Group
(ISSG). 2013, http://calendar.k-state.edu/withlab/consbiol/IUCN_invaders.pdf.
[243]Reap, J., F. Roman, S. Duncan and B. Bras, 2008, “A Survey of Unresolved
Problems in Life Cycle Assessment: Part 2: Impact Assessment and
Interpretation,” International Journal of Life Cycle Assessment, Vol. 13, pp. 374-
388.
[244]Telenko, C., 2012, "Probabilistic Graphical Modeling as a Use Stage Inventory
Method for Environmentally Concious Design," Mechanical Engineering, Texas,
Austin.
[245]Vattam, S. S. and A. K. Goel, 2011, "Foraging for Inspiration: Understanding and
Supporting the Online Information Seeking Practices of Biologically Inspired
Designers," ASME 2011 International Design Engineering Technical Conferences
277
& Computeres and Information in Engineering Conference, Washington, DC,
DETC2011-48238.
[246]Yen, J. and M. Weissburg, 2007, “Editorial: Perspectives on Biologically Inspired
Design: Introduction to the Collected Contributions,” Bioinspiration and
Biomimetics, Vol. 2, No. 4.
[247]Shu, L. H., 2010, “A Natural-Language Approach to Biomimetic Design,” Artificial
Intelligence for Engineering Design, Analysis, and Manufacturing, Vol. 24, No.
4, pp. 507-519.
[248]Beck, B. B., 1980, Animal Tool Behavior: The Use and Manufacture of Tools by
Animals, Garland Publishing, Inc. , New York.
[249]Hunter, J. P., 1998, “Key Innovations and the Ecology of Macroevolution,” Trends
in Ecology & Evolution, Vol. 13, No. 1, pp. 31-36.
[250]Zikmund, W. G., 2003, Business Research Methods, Thomson Southwestern,
Mason, Ohio.
[251]Ask Nature, 2013, Browse Biomimicry, The Biomimicry 3.8 Institute. 2013,
http://www.asknature.org/browse.
[252]2011, Bioinspiration and Biomimetics, Vol. 6, No. 1, pp. 014001-019501,
http://iopscience.iop.org/1748-3190/6/1.
[253]2010, “Special Issue on Bioinspired Flight,” Bioinspiration and Biomimetics, Vol.
5, No. 4, pp. 040401-049901.
[254]Bird, W.,2008, Natural by Design. The Japan Times Online,
http://search.japantimes.co.jp/cgi-bin/fl20080824x1.html.
[255]Bionics, Wikipedia. 2011, http://en.wikipedia.org/wiki/Bionics.
[256]Pailhas, Y., C. Capus, K. Brown and P. Moore, 2010, “Analysis and Classification
of Broadband Echoes Using Bio-Inspired Dolphin Pulses,” Journal of the
Acoustical Society of America, Vol. 127, No. 6, pp. 3809-3820.
[257]Youngblood, J. P. and N. R. Sottos, 2008, “Bioinspired Materials for Self-Cleaning
and Self-Healing,” MRS Bulletin, Vol. 33, pp. 732-738.
278
[258]Development of Oil Resistant Material That Prevents Fingerprint Smutching, Say
People. 2013, http://saypeople.com/2011/12/05/development-of-oil-resistant-
material-that-prevents-fingerprint-smutching/#axzz2ReHWxT3H.
[259]HitchScan Wireless Trailer System - Wireless Sensor, RVFun Products. 2013,
http://www.rvfunproducts.com/hitchscan-wireless-trailer-system-wireless-sensor-
p-2291.html.
[260]Joanne,Top 10 Cutest Animals Threatened by BP Oil Spill, Ranker. 2013,
http://www.ranker.com/list/top-10-cutest-animals-threatened-by-bp-oil-
spill/joanne.
[261]Palter, S. F.,2006, Geckos Grabbing Gizmos in the Or, docinthemachine.com. 2013,
http://docinthemachine.com/geckosintheor/.
[262]Karp, J.,2008, Sticky Tape to Heal Surgical Incisions, MIT Technology Review,
http://www.technologyreview.com/news/409625/sticky-tape-to-heal-surgical-
incisions/.
[263]Ushnaroy,2010, The Exciting Glass Bottom Boat Ride on Blue Bay Marine Park,
Mauritius. 2013, http://www.travelihub.com/the-exciting-glass-bottom-boat-ride-
on-blue-bay-marine-park-mauritius/.
[264]Sharklet Technologies Inc., 2010, Technology: Inspired by Nature. 2012,
http://www.sharklet.com/technology/.
[265]Brennan, A. B., R. H. Baney, M. L. Carman, T. G. Estes, A. W. Feinberg, L. H.
Wilson and J. F. Schumacher,2010, Surface Topographies for Non-Toxic
Bioadhesion Control. United States. US 7,650,848 B2.
[266]Brennan, A. B., C. J. Long, J. W. Bagan, J. F. Schumacher and M. M.
Spiecker,2010, Surface Topographies for Non-Toxic Bioadhesion Control. United
States. US 2010/0226943 A1.
[267]Chung, K. K., J. F. Schumacher, E. M. Sampson, R. A. Burne, P. J. Antonelli and
A. B. Brennan, 2007, “Impact of Engineered Surface Microtopography on
Biofilm Formation of Staphylococcus Aureus,” Biointerphases, Vol. 2, No. 2, pp.
89-94.
[268]IEA,2010, Energy Balances of Non-OECD Countries 2010. Paris, France,
International Energy Agency: II.303-II.304.
279
[269]2010, Test Your Knowledge of Biomimicry, CNN Tech. 2011,
http://www.cnn.com/2010/TECH/innovation/06/21/biomimicry.design.quiz/index
.html.
[270]Allen, R., 2010, "Introduction," Bulletproof Feathers: How Science Uses Nature's
Secrets to Design Cutting-Edge Technology (R. Allen, Ed.), The University of
Chicago Press, Chicago, pp. 6-21.
[271]Wikipedia,2010, Bionics. 2010, http://en.wikipedia.org/wiki/Bionics.
[272]Kohli, N.,2007, Biofouling and Design of a Biomimetic Hull-Grooming Tool. West
Bethesda, Maryland, Naval Surface Warefare Center: Carderock Division: 1-38.
[273]Vattam, S., M. Helms and A. K. Goel,2007, Biologically-Inspired Innovation in
Engineering Design: A Cognitive Study, Graphics, Visualization and Usability
Center, Georgia Institute of Technology.
[274]Zari, M. P., 2010, “Biomimetic Design for Climate Change Adaptation and
Mitigation,” Architectural Science Review, Vol. 53, No. 2, pp. 172-183.
[275]Biomimicry Institute, 2010, Biolytix Water Filter, Ask Nature. 2010,
http://www.asknature.org/product/f9d2ab73e15de8d6e44bc15cac4549a3.
[276]Biomimicry Institute, 2010, CAO and SKO Design Software, Ask Nature. 2010,
http://www.asknature.org/product/99d6740a0a07a9d003480f1c414ee177.
[277]Venton, D.,2011, Mother Nature as Engineer: 9 Design Tricks Borrowed from
Biology. Wired Science, http://www.wired.com/wiredscience/2011/08/
biomimicry-gallery/?pid=1785.
[278]Biomimicry Institute, 2010, i2 Modular Carpet, Ask Nature. 2010,
http://www.asknature.org/product/a84a9167f21f1cc690e0e673c4808833.
[279]FLOR, I.,2012, About Our Products. 2012,
http://www.interfaceflor.com/Default.aspx?Section=2&Sub=3.
[280]Biomimicry Institute, 2010, Sharklet AF, Ask Nature. 2010,
http://www.asknature.org/product/3c21a56f0ba2ae549894a2bf79372bda.
[281]Sharklet Technologies, Inc., 2010, Home. 2011, http://www.sharklet.com/.
[282]Biomimicry Institute,2010, Shinkansen Train, Ask Nature. 2010,
http://www.asknature.org/product/6273d963ef015b98f641fc2b67992a5e.
280
[283]Biomimicry Institute, 2009, Sir Marc Isambard Brunel’s Tunnel Borer, Ask Nature.
2010, http://www.asknature.org/product/689fd8eaadf3fb570097fa5c4ffb7049.
[284]Biomimicry Institute, 2009, Baleen Filters Water Filters, Ask Nature. 2010,
http://www.asknature.org/product/0fdee3b68d08f075009711803dc93c16.
[285]Calera,Our Story. 2012, http://calera.com/index.php/about_us/our_story/.
[286]Biomimicry Institute, 2010, Calera MAP Cement-Making Process, Ask Nature.
2010, http://www.asknature.org/product/9242c6b587aba1877c788cd8409d60ac.
[287]Biomimicry Institute, 2009, HotZone Radiant Heater, Using IRLens, Ask Nature.
2010, http://www.asknature.org/product/0571c3e5e3376604c4c51840dbc3281d.
[288]Airbus,2012, Biomimicry, Imitating Nature's Best Ideas. 2012,
http://www.airbus.com/innovation/eco-efficiency/design/biomimicry/?contentId=
[_TABLE%3Att_content%3B_FIELD%3Auid]%2C&cHash=22935adfac92fcbbd
4ba4e1441d13383.
[289]Biomimicry Institute, 2010, Mirasol Display Technology, Ask Nature. 2010,
http://www.asknature.org/product/af429a05af212ee9fc74977247408bf5.
[290]Vella, M.,Design Tips from Mother Nature. Bloomberg Businessweek. 2012,
http://images.businessweek.com/ss/08/02/0209_green_biomimic/source/1.htm.
[291]Biomimicry Institute, 2010, Crystal Palace in London, Ask Nature. 2010,
http://www.asknature.org/product/a13b2a14313fcc7123e827269a1d8a73.
[292]Cameron, D. O.,2005, Biolytic Filtration. USPTO. United States, Dowmus Pty. Ltd.
US 6,890,439 B2.
[293]Cameron, D. O.,1997, Method for Treating Wastewater and Solid Organic Waste.
USPTO. United States, Dowmus Pty Ltd. 5,633,163.
[294]Vincent, J., 2010, "Chapter 6: New Materials and Natural Design," Bulletproof
Feathers: How Science Uses Nature's Secrets to Design Cutting-Edge Technology
(R. Allen, Ed.), The University of Chicago Press, Chicago, pp. 132-171.
[295]Cameron, D. O.,1999, Effluent Treatment System. USPTO. United States, Downus
Pty. Ltd. 5,919,366.
281
[296]Cameron, D. O.,1999, Self-Cleansing Filter. USPTO. United States, Dowmus Pty
Ltd. 5,976,374.
[297]Biolytix Water, 2011, Why Biolytix? 2011, http://www.biolytix.co.nz/commercial/
why_biolytix_25_key_benefits/.
[298]Yen, J., 2010, "Chapter 1: Marine Dynamics," Bulletproof Feathers: How Science
Uses Nature's Secrets to Design Cutting-Edge Technology (R. Allen, Ed.), The
University of Chicago Press, Chicago, pp. 22-43.
[299]Okada, M., Y. Nakamura and S. Ban, 2001, "Design of Programmable Passive
Compliance Shoulder Mechanism," Proceedings of the 2001 IEEE International
Conference on Robotics & Automation, Seoul, Korea.
[300]Wright, I. C., R. R. Neptune, A. J. v. d. Bogert and B. M. Nigg, 1998, “Passive
Regulation of Impact Forces in Heel-Toe Running,” Clinical Biomechanics, Vol.
13, pp. 521-531.
[301]Honig, C. R., C. L. Odoroff and J. L. Frierson, 1982, “Active and Passive Capillary
Control in Red Muscle at Rest and in Excercise,” American Journal of Physiology
- Heart and Circulatory Physiology, Vol. 243, pp. H196-H206.
[302]Dietschy, J. M., 1968, “Mechanisms for the Intestinal Absorption of Bile Acids,”
Journal of Lipid Research, Vol. 9, pp. 297-309.
[303]Dechev, N., W. L. Cleghorn and S. Naumann, 2001, “Multiple Finger, Passive
Adaptive Grasp Prosthetic Hand,” Mechanism and Machine Theory, Vol. 36, pp.
1157-1173.
[304]Sirovich, L. and S. Karlsson, 1997, “Turbulent Drag Reduction by Passive
Mechanisms,” Nature, Vol. 388.
[305]Lin, C.-C., J.-M. Ueng and T.-C. Huang, 1999, “Seismic Response Reduction of
Irregular Buildings Using Passive Tuned Mass Dampers,” Engineering
Structures, Vol. 22, pp. 513-524.
[306]Jolly, M. R., D. J. Rossetti, M. A. Norris and L. R. Miller,1998, Hybrid Active-
Passive Noise and Vibration Control System for Aircraft. USPTO. United States,
Lord Corporation. 5,845,236.
[307]Peippo, K., P. Kauranen and P. D. Lund, 1991, “A Multicomponent PCM Wall
Optimized for Passive Solar Heating,” Energy and Buildings, Vol. 17, pp. 259-
270.
282
[308]Letan, R., V. Dubovsky and G. Ziskind, 2003, “Passive Ventilation and Heating by
Natural Convection in a Multi-Storey Building,” Building and Environment, Vol.
38, pp. 197-208.
[309]Canbazoglu, S., A. Sahinaslan, A. Ekmekyapar, Y. G. Aksoy and F. Akarsu, 2005,
“Enhancement of Solar Thermal Energy Storage Performance Using Sodium
Thiosulfate Pentahydrate of a Conventional Solar Water-Heating System,”
Energy and Buildings, Vol. 37, pp. 235-242.
[310]Grise, W. and C. Patrick, 2002, “Passive Solar Lighting Using Fiber Optics,”
Journal of Industrial Technology, Vol. 19, No. 1, pp. 2-7.
[311]Collins, S., A. Ruina, R. Tedrake and M. Wisse, 2005, “Efficient Bipedal Robots
Based on Passive-Dynamic Walkers,” Science, Vol. 307, No. 5712, pp. 1082-
1085.
[312]Kljuno, E., J. J. Zhu, R. L. W. II and S. M. Reilly, 2011, "A Biomimetic Elastic
Cable Driven Quadruped Robot - The Robocat," International Mechanical
Engineering Congress & Exposition, Denver, Colorado, IMECE2011-63534.
[313]Lentink, D. and A. A. Biewener, 2010, “Nature-Inspired Flight - Beyond the Leap,”
Bioinspiration and Biomimetics, Vol. 5, No. 4, pp. 1-9.
[314]Dem Bones Dem Bones, Simply Healthy. 2012,
http://simplyhealthy4u.blogspot.com/.
[315]Dickinson, M. H. and M. S. Tu, 1997, “The Function of Dipteran Flight Muscle,”
Comparative Biochemistry and Physiology, Vol. 116A, No. 3, pp. 223-238.
[316]Whittington, B., A. Silder, B. Heiderscheit and D. G. Thelen, 2008, “The
Contribution of Passive-Elastic Mechanisms to Lower Extremity Joing Kinetics
During Human Walking,” Gait & Posture, Vol. 27, No. 4, pp. 628-634.
[317]Gottig, N., E. V. Elias, R. Quiroga, M. J. Nores, A. J. Solari, M. C. Touz and H. D.
Lujan, 2006, “Active and Passive Mechanisms Drive Secretory Granule
Biogenesis During Differentiation of the Intestinal Parasite Giardia lamblia,”
Journal of Biological Chemistry, Vol. 281, No. 26, pp. 18156-18166.
[318]Doherty, T. M., K. Asotra, L. A. Fitzpatrick, J.-H. Qiao, D. J. Wilkin, R. C.
Detrano, C. R. Dunstan, P. K. Shah and T. B. Rajavashisth, 2003, “Calcification
in Atherosclerosis: Bone Biology and Chronic Inflammation at the Arterial
283
Crossroads,” Proceedings of the National Academy of Sciences of the United
States of America, Vol. 100, No. 20, pp. 11201-11206.
[319]Saunders, F., B. A. Trimmer and J. Rife, 2011, “Modeling Locomotion of a Soft-
Bodied Arthropod Using Inverse Dynamics,” Bioinspiration and Biomimetics,
Vol. 6, pp. 016001.
[320]Pamecha, A., C.-J. Chiang, D. Stein and G. Chirikjian, 1996, "Design and
Implementation of Metamorphic Robots," The 1996 ASME Design Engineering
Technical Conference and Computers in Engineering Conference, Irvine,
California, 96-DETC/MECH-1149.
[321]Seepersad, C. C., B. M. Dempsey, J. K. Allen, F. Mistree and D. L. McDowell,
2004, “Design of Multifunctional Honeycomb Materials,” American Institute of
Aeronautics and Astronautics Journal, Vol. 42, No. 5, pp. 1025-1033.
[322]Ulrich, K. T. and S. D. Eppinger, 2004, Product Design and Development, 3rd
Edition, McGraw-Hill/Irwin, New York.
[323]Cutherell, D., 1996, "Chapter 16: Product Architecture," The PDMA Handbook of
New Product Development (J. Milton D. Rosenau, A. Griffin, G. A. Castellion
and N. F.Anschuetz, Eds.), John Wiley & Sons, New York, pp. 217-235.
[324]Stone, R. B., K. L. Wood and R. H. Crawford, 2000, “A Heuristic Method for
Identifying Modules for Product Architectures,” Design Studies, Vol. 21, No. 1,
pp. 5-31.
[325]Otto, K. and K. Wood, 2001, Product Design: Techniques in Reverse Engineering
and New Product Development, Prentice Hall, Upper Saddle Ridge, New Jersey.
[326]Sosa, M. E., S. D. Eppinger and C. M. Rowles, 2003, “Identifying Modular and
Integrative Systems and Their Impact on Design Team Interactions,” Journal of
Mechanical Design, Vol. 125, pp. 240-252.
[327]Newcomb, P. J., B. Bras and D. W. Rosen, 1996, "Implications of Modularity on
Product Design for the Life Cycle," The 1996 ASME Design Engineering
Technical Conferences and Computers in Engineering Conference, Irvine,
California, 96-DETC/DTM-1516.
[328]Liu, K. and L. Jiang, 2011, “Bio-Inspired Design of Multiscale Structures for
Function Integration,” Nano Today, Vol. 6, pp. 155-175.
284
[329]Stahlberg, R. and M. Taya, 2006, "Nastic Structures: The Enacting and Mimicking
of Plant Movements," Biomimetics: Biologically Inspired Technologies (Y. Bar-
Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 473-493.
[330]Pandremenos, J., E. Vasiliadis and G. Chryssolouris, 2012, “Design Architectures in
Biology,” Procedia CIRP, Vol. 3, pp. 448-452.
[331]Jose, A. and M. Tollenaere, 2005, “Modular and Platform Methods for Product
Family Design: Literature Analysis,” Journal of Intelligent Manufacturing, Vol.
16, pp. 371-390.
[332]Tseng, H.-E., C.-C. Chang and J.-D. Li, 2008, “Modular Design to Support Green
Life-Cycle Engineering,” Expert Systems with Applications, Vol. 34, pp. 2524-
2537.
[333]Umeda, Y., S. Fukushige, K. Tonoike and S. Kondoh, 2008, “Product Modularity
for Life Cycle Design,” CIRP Annals - Manufacturing Technology, Vol. 57, pp.
13-16.
[334]Gu, P., M. Hashemian and S. Sosale, 1997, “An Integrated Modular Design
Methodology for Life-Cycle Engineering,” Annals of the CIRP, Vol. 46, No. 1,
pp. 71-74.
[335]Gu, P. and S. Sosale, 1999, “Product Modularization for Life Cycle Engineering,”
Robotics and Computer Integrated Manufacturing, Vol. 15, pp. 387-401.
[336]Lucotti, A. and G. Zerbi, 2007, “Fiber-Optic SERS Sensor with Optimized
Geometry,” Sensors and Actuators B, Vol. 121, pp. 356-364.
[337]Anthony, D. K., S. J. Elliott and A. J. Keane, 2000, “Robustness of Optimal Design
Solutions to Reduce Vibration Transmission in a Lightweight 2-D Structure, Part
I: Geometric Design,” Journal of Sound and Vibration, Vol. 229, No. 3, pp. 505-
528.
[338]Commenge, J. M., L. Falk, J. P. Corriou and M. Matlosz, 2002, “Optimal Design
Flow Uniformity in Microchannel Reactors,” AIChE Journal, Vol. 48, No. 2, pp.
345-358.
[339]Benini, E., 2004, “Three-Dimensional Multi-Objective Design Optimization of a
Transonic Compressor Rotor,” Journal of Propulsion and Power, Vol. 20, No. 3,
pp. 559-565.
285
[340]Kohlmann, K. T., M. Thiemann and W. H. Brunger, 1991, “E-Beam Induced X-Ray
Mask Repair with Optimized Gas Nozzle Geometry,” Microelectronic
Engineering, Vol. 13, pp. 279-282.
[341]Lin, C.-Y., R. M. Schek, A. S. Mistry, X. Shi, A. G. Mikos, P. H. Krebsbach and S.
J. Hollister, 2005, “Functional Bone Engineering Using ex Vivo Gene Therapy
and Topology-Optimized, Biodegradable Polymer Composite Scaffolds,” Tissue
Engineering, Vol. 11, pp. 1589-1598.
[342]Timmins, L. H., M. R. Moreno, C. A. Meyer, J. C. Criscione, A. Rachev and J. E.
M. Jr., 2007, “Stented Artery Biomechanics and Device Design Optimization,”
Medical & Biological Engineering and Computing, Vol. 45, pp. 505-513.
[343]Huh, D., Y.-s. Torisawa, G. A. Hamilton, H. J. Kim and D. E. Ingber, 2012,
“Microengineered Physiological Biomimicry: Organs-on-Chips,” Lab on a Chip,
Vol. 12, pp. 2156-2164.
[344]Martin-Palma, R. J. and A. Lakhtakia, 2012, “Engineered Biomimicry for
Harvesting Solar Energy: A Bird's Eye View,” International Journal of Smart and
Nano Materials, pp. 1-8.
[345]Winter, A. G., A. H. Slocum, A. E. Hosoi and R. L. H. Deits, 2009, "The Design
and Testing of Roboclam: A Machine Used to Investigate and Optimize Razor
Clam-Inspired Burrowing Mechanisms for Engineering Applications,"
IDETC/CIE 2009, San Diego, California, DETC2009-86808.
[346]Arzt, E., 2006, “Biological and Artificial Attachment Devices: Lessons for
Materials Scientists from Flies and Geckos,” Materials Science and Engineering
C, Vol. 26, pp. 1245-1250.
[347]Reichman, O. J., T. G. Whitham and G. A. Ruffner, 1982, “Adaptive Geometry of
Burrow Spacing in Two Pocket Gopher Populations,” Ecology, Vol. 63, No. 3,
pp. 687-695.
[348]Andersen, D. C., 1982, “Belowground Herbivory: The Adaptive Geometry of
Geomyid Burrows,” The American Naturalist, Vol. 119, No. 1, pp. 18-28.
[349]Biolytix. 2012, http://www.environmentalplumbingsolutions.com.au/biolytix.htm.
[350]Naya, D. E., C. Veloso, J. L. P. Munoz and F. Bozinovic, 2007, “Some Vaguely
Explored (But Not Trivial) Costs of Tail Autotomy in Lizards,” Comparative
Biochemistry and Physiology, Part A, Vol. 146, No. 2, pp. 189-193.
286
[351]Gregorich, E. G., L. W. Turchenek, M. R. Carter and D. A. Angers, Eds., 2001, Soil
and Environmental Science Dictionary, CRC Press, Boca Raton, FL.
[352]Phillips, M., 2002, "Wetlands," Biology (R. Robinson, Ed.), New York, Vol. 4, pp.
197-198.
[353]The American Heritage Science Dictionary, 2005, Riparian. The Free Dictionary,
Farlex, Inc. 2012, http://www.thefreedictionary.com/riparian.
[354]Green, K.,2009, Maintaining Composure While Decomposing. Gardening for
Nature. 2012, http://gardeningfornature.blogspot.com/2009/11/maintaining-
composure-while-decomposing.html.
[355]Jo-Ann,2011, The Lay of the Land. 2012, http://bilberryhill.wordpress.com/.
[356]Taylor, M., W. P. Clarke and P. F. Greenfield, 2003, “The Treatment of Domestic
Wastewater Using Small-Scale Vermicompost Filter Beds,” Ecological
Engineering, Vol. 21, pp. 197-203.
[357]Biolytix,How it Works: In Pictures. 2012, http://www.biolytix.com/in-pictures/.
[358]Biolytix,Biolytix... Award Winning Wastewater Treatment Systems. 2012,
http://www.biolytix.com/.
[359]Biolytix,How It Works: Biolytix Copies Nature. 2012,
http://www.biolytix.com/copies-nature/.
[360]Biolytix Southren Africa, 2008, How Biolytix Works. 2012,
http://www.biolytix.co.za/?page_id=4.
[361]Turner, S., 2009, “ASIT - A Problem Solving Strategy for Education and Eco-
Friendly Sustainable Design,” International Journal of Technology and Design
Education, Vol. 19, No. 2, pp. 221-235.
[362]Swilling, M. and E. Annecke, 2006, “Building Sustainable Neighbourhoods in
South Africa: Learning from the Lynedoch Case,” Environment and
Urbanization, Vol. 18, No. 2, pp. 315-332.
[363]Qasim, S. R., 2006, "Small Flow Wastewater Treatment Technology for Domestic
and Special Applications," Encyclopedia of Environmental Science and
Engineering (J. R. Pfafflin and E. N. Ziegler, Eds.), CRC Press, Boca Raton, FL,
Vol. 2, pp. 1082 - 1093.
287
[364]The Columbia Electronic Encyclopedia, 2007, Septic Tank. The Free Dictionary,
Farlex, Inc. 2012, http://encyclopedia2.thefreedictionary.com/Septic+Tank.
[365]Pro-Pump,Understanding Septic Systems. 2013, http://www.propump.com/
septic.asp.
[366]Wikipedia,2010, Scheme of Septic Tank. 2012, http://en.wikipedia.org/wiki/
File:Septic_tank_EN.svg.
[367]Sheldon Farm Septic Tank Service, I.,2012, How Septic Systems Work. Ashby, MA.
2012, http://www.pottyon.com/How_Septic_Systems_Work.html.
[368]Daimler,2005, The Mercedes-Benz Bionic Car: Streamlined and Light, Like a Fish
in Water - Economical and Environmentally Friendly Thanks to the Latest Diesel
Technology. Press Kit: The Mecedes-Benz Bionic Car as a Concept Vehicle.
Washington. 2011, http://media.daimler.com/dcmedia/0-921-885913-1-815003-1-
0-0-815031-0-1-11702-854934-0-1-0-0-0-0-0.html?TS=1320351831755.
[369]BMW, BMW 3 Series Sedan: All the Facts. 2011,
http://www.bmw.com/com/en/newvehicles/3series/sedan/2008/allfacts/engine/tec
hnical_data.html.
[370]NewCarBuyingGuide.Com. 2011, http://newcarbuyingguide.com/images/articles/
reviews/bmw/BMW3Series01.jpg.
[371]Office of the Surgeon General, 2004, "The Basics of Bone in Health and Disease,"
Bone Health and Osteoporosis: A Report of the Surgeon General, U.S.
Department of Health & Human Services.
[372]Personal Communication. Mattheck, C., Feb 16, 2012, Bionic Car. J. O'Rourke.
[373] 2011, http://newark1.com/uploaded_images/boxfish-design1-720183.jpg.
[374]2005, At a Glance: More Special Technical and Stylistic Features of the Concept
Car. Washington, Daimler. 2012, http://media.daimler.com/dcmedia/0-921-
885913-1-815020-1-0-0-0-0-1-11702-854934-0-1-0-0-0-0-
0.html?TS=1329513791918.
[375]Mattheck, C., K. Bethge, A. Sauer, J. Sorensen, C. Wissner and O. Kraft, 2009,
“About Cracks, Dunce Caps and a New Way to Stop Cracks,” Fatigue &
Fracture of Engineering Materials & Structures, Vol. 32, pp. 484-492.
[376]CarWireFire,Car Audio. 2012, http://carwirefire.com/noise_solutions.html.
288
[377]Building Sizes that Require an Industrial Air Conditioner, Must Know How. 2011,
http://www.mustknowhow.com/index.php/air-conditioning/building-sizes-that-
require-an-industrial-air-conditioner.
[378]2010, Economists: Every $1 of Electricity from Coal Does $2 in Damage to U.S.,
inagist. 2011, http://inagist.com/greenforall/119485680350011393/Economists
%3A_Every_$1_of_electricity_from_coal_does_$2_in_damage_to_U.S.
[379]2010, Philly Bagged Leaf Drive Kicks Off Nov 8th, GreenPhillyBlog.com. 2012,
http://www.greenphillyblog.com/tag/2010/.
[380]Daniel, S. D. and D. D. Oakey,2009, Random Installation Carpet Tiles. USPTO.
United States, Interface, Inc. 7,601,413 B2.
[381]2011, Get the Complete Picture at Greenbuild, Jetson Green. 2011,
http://www.jetsongreen.com/2011/10/get-the-complete-picture-epd-
greenbuild.html.
[382]Nelson, E., 2009, “How Interface Innovates with Suppliers to Create Sustainablity
Solutions,” Global Business and Organizational Excellence, Vol. 28, No. 6, pp.
22-30.
[383]FLOR, I.,2012, i2TM
Modular Carpet - How Nature Would Design a Floor. 2012,
http://www.interfaceflor.com/Default.aspx?Section=3&Sub=11.
[384]Robbins, J.,2002, Second Nature. Smithsonian, http://www.smithsonianmag.com/
science-nature/Second_Nature.html.
[385]2012, Jacksonville Jaguars Tile, Jacksonville Jaguars: Jerseys & Memorabilia
Shopping. 2012, http://www.jaguarsfootballdeals.com/fan/jacksonville-jaguars-
tile.
[386]Poole, B.,2007, Biomimetics: Borrowing from Biology. Science Articles: The Naked
Scientists: Science Radio & Science Podcasts, http://www.thenaked
scientists.com/HTML/articles/article/biomimeticsborrowingfrombiology/.
[387]Nakajima, A., A. Fujishima, K. Hashimoto and T. Watanabe, 1999, “Preparation of
Transparent Superhydrophobic Boehmite and Silica Films by Sublimation of
Aluminum Acetylacetonate,” Advanced Materials, Vol. 11, No. 16, pp. 1365-
1368.
289
[388]Ultrawave,2012, Ultrasonic Technology - How Ultrasonic Cleaning Works. 2012,
http://www.ultrawave.co.uk/pages/Ultrasonic-Technology-54.php.
[389]Direct Industry, Karcher: Parts Solvent Cleaning Machine (Spray). 2012,
http://www.directindustry.com/prod/karcher/part-cleaning-machines-spray-5768-
212991.html#.
[390]Dean, B. and B. Bhushan, 2010, “Shark-Skin Surfaces for Fluid-Drag Reduction in
Turbulent Flow: A Review,” Philosophical Transactions of the Royal Society A,
Vol. 368, pp. 4775-4806.
[391]2010, Shark Skin Boat Hulls Are on the Horizon, Maritime Journal. 2012,
http://www.maritimejournal.com/features101/vessel-build-and-
maintenance/vessel-repair-and-maintenance/shark-skin-boat-hulls-are-on-the-
horizon.
[392]A Walk in the Woods, The Huffington Post. 2012, http://i.huffpost.com/
gadgets/slideshows/203250/slide_203250_587234_small.jpg.
[393]2010, Sharklet Technologies, Inc. 2011, http://www.sharklet.com/sharklet-
products/push-door-plate-skin/.
[394]2010, SharkletTM
Surface Protection, Sharklet Technologies, Inc. 2012,
http://www.sharklet.com/sharklet-products/sharklet-safetouch-for-commercial/.
[395]Sharklet Technologies, Inc., Sharklet Safetouch. 2012, http://www.sharklet.com/wp-
content/themes/sharklet/pdfs/Sharklet-SafeTouch-Commercial-2010.pdf.
[396]Brennan, A. B., R. H. Baney, M. C. Turnage, T. G. Estes, A. W. Feinberg, L. H.
Wilson and J. F. Schumacher,2010, Surface Topographies for Non-Toxic
Bioadhesion Control. USPTO. United States, University of Florida Research
Foundation. US 2010/1026404 A1.
[397]Sharklet Technologies, Inc., 2010, SharkletTM
Surface Protection. 2012,
http://www.sharklet.com/sharklet-products/sharklet-safetouch-for-commercial/.
[398]Davies, J. and D. Davies, 2010, “Origins and Evolution of Antibiotic Resistance,”
Microbiology and Molecular Biology Reviews, Vol. 74, No. 3, pp. 417-433.
[399]Tezel, U. and S. G. Pavlostathis, 2012, "Role of Quaternary Ammonium
Compounds on Antimicrobial Resistance in the Environment," Antimicrobial
Resistance in the Environment (P. L. Keen and M. H. M. M. Montforts, Eds.),
Wiley, Hoboken, NJ.
290
[400]Clorox,2012, What's in Clorox Disinfecting Bathroom Cleaner?, The Clorox
Company. 2012, http://www.clorox.com/products/clorox-disinfecting-bathroom-
cleaner/ingredients-and-safety/.
[401]Clorox,2012, Clorox Disinfecting Bathroom Cleaner: Usage Instructions. 2012,
http://www.clorox.com/products/clorox-disinfecting-bathroom-cleaner/how-to/.
[402]Clorox,2012, Clorox Disinfecting Cleaner: About. 2012,
http://www.clorox.com/products/clorox-disinfecting-bathroom-cleaner/.
[403]Clorox,2004, Material Safety Data Sheet: Clorox Disinfecting Bathroom Cleaner.
Oakland, CA, Clorox Professional Products Company: 1,
http://www.thecloroxcompany.com/downloads/msds/cloroxdisinfectingcleaners/cl
oroxdisinfectingbathroomcleaner11-04.pdf.
[404]DOW,2012, Product Safety Assessment (PSA):Salts of Ethylenediaminetetraacetic
Acid (EDTA). 2012, http://www.dow.com/productsafety/finder/edta.htm.
[405]McBain, A., A. Richard and P. Gilbert, 2002, “Possible Implications of Biocide
Accumulation in the Environment on the Prevalence of Bacterial Antibiotic
Resistance,” Journal of Industrial Microbiology & Biotechnology, Vol. 29, pp.
326-330.
[406]Rutala, W. A., D. J. Weber and Heathcare Infection Control Practices Advisory
Committee, 2008, Guideline for Disinfection and Sterilization in Healthcare
Facilities, CDC Centers for Disease Control: 1-158.
[407]EPA, 2006, Reregistration Eligibility Decision for Alkyl Dimethyl Benzyl
Ammonium Chloride (ADBAC). Washington, D.C., Office of Prevention,
Pesticides, and Toxic Substances, http://www.epa.gov/oppsrrd1/
REDs/adbac_red.pdf.
[408]Moyle, R. G., J. Fuchs, E. Pasquet and B. B. Marks, 2007, “Feeding Behavior, Toe
Count, and the Phylogenetic Relationships Among Alcedinine Kingfishers
(Alcedininae),” Journal of Avian Biology, Vol. 38, No. 3, pp. 317-326.
[409]Katzir, G. and J. M. Camhi, 1993, “Escape Response of Black Mollies (Poecilia
sphenops) to Predatory Dives of a Pied Kingfisher (Ceryl rudis),” Copeia, Vol.
1993, No. 2, pp. 549-553.
[410]Amazing Photo of Kingfisher Diving, Alistair.pott. 2012,
http://alistairpott.com/2009/05/20/amazing-photo-of-kingfisher-diving.
291
[411]Swiss/Japan Association for Engineers and Scientists, 2006, Train-Kingfisher, Cnet.
2012, http://news.cnet.com/2300-11395_3-6130045-5.html?tag=mncol.
[412]Lovegrove, K., 2004, Railway: Identity, Design and Culture, Laurence King
Publishing, London.
[413]Hood, C. P., 2006, Shinkansen: From Bullet Train to Symbol of Modern Japan,
Routledge, New York, NY.
[414]Soejima, H.,2003, Railway Technology in Japan - Challenges and Strategies. Japan
Railway & Transport Review: 4-13.
[415]Kobayashi, K.,2005, JFS Bio-mimicry Interview Series: No.6 Technologies Learned
from Living Things: "Shinkansen Technology Learned from an Owl?" - The Story
of Eiji Nakatsu. Japan for Sustainability Newsletter. #031,
http://www.japanfs.org/en_/newsletter/200503-2.html.
[416]Mashimo, S., E. Nakatsu, T. Aoki and K. Matsuo, 1997, “Attenuation and
Distortion of a Compression Wave Propagating in a High-Speed Railway
Tunnel,” JSME International Journal, Series B: Fluids and Thermal Engineering,
Vol. 40, No. 1, pp. 51-57.
[417]High-Speed Trains, Design and the Universe. 2012, http://designanduniverse.com/
articles/high-speed_trains.php.
[418]N+P Industrial Design GmbH, 2012, Shinkansen 500 Nozomi. 2012,
http://www.neumeister-partner.com/en/node/405.
[419]T, G.,2011, One Kingfisher Can Set a Rapid Speed Train Back on Track. 2012,
http://www.groept.be/www/bachelor_programs/vision_of_engineering/
kingfisher/.
[420]Skutch, A. F., 1957, “Life History of the Amazon Kingfisher,” The Condor, Vol.
59, No. 4, pp. 217-229.
[421]Remsen, J. V., 1991, Community Ecology of Neotropical Kingfishers, University of
California Press, Berkely, CA.
[422]Marshall, A. J., 1931, “The Azure Kingfisher,” The Emu, Vol. 31, No. 1, pp. 44-47.
[423]2011, Beak Provides Streamlining: Common Kingfisher, Ask Nature. 2012,
http://www.asknature.org/strategy/4c3d00f23cae38c1d23517b6378859ee.
292
[424]Biello, D., 2002, Bullet Trains: Inside and Out, The Rosen Publishing Group, New
York.
[425]EPA, 2011, Air and Radiation: Noise Pollution. 2012,
http://www.epa.gov/air/noise.html.
[426]Tanaka, Y., R. Takahashi and T. Tamada, 2003, "Noise Control of Sanyo
Shinkansen," The 32nd International Congress and Exposition on Noise Control
Engineering, Seogwipo, Korea.
[427]OECD, Globalisation, Transport and the Environment. 2012,
http://www.oecd.org/dataoecd/19/45/45095528.pdf.
[428]Horihata, K., H. Sakamoto, H. Kitabayashi and A. Ishikawa,2008, Environmentally
Friendly Railway-Car Technology. Hitachi Review. 57: 18-22.
[429]Stansfeld, S. A. and M. P. Matheson, 2003, “Noise Pollution: Non-Audiory Effects
on Health,” British Medical Bulletin, Vol. 68, pp. 243-257.
[430]Rheindt, F. E., 2003, “The Impact of Roads on Birds: Does Song Frequency Play a
Role in Determining Susceptibility to Noise Pollution?,” Journal of Ornithology,
Vol. 144, No. 3, pp. 295-306.
[431]Reijnen, R. and R. Foppen, 2006, "Chapter 12: Impact of Road Traffic on Breeding
Bird Populations," Ecology of Transportation: Managing Mobility for the
Environment (J. Davenport and J. L. Davenport, Eds.), Springer, Dordrecht, The
Netherlands, Vol. 10, pp. 255-274.
[432]Davenport, J. and J. L. Davenport, 2006, "Introduction," Ecology of Transportation:
Managing Mobility for the Environment (J. Davenport and J. L. Davenport, Eds.),
Springer, Dordrecht, The Netherlands, Vol. 10.
[433]Riihimaki, J.,2007, High Speed Trains - Sokol, Nieie, 4rail.net. 2012,
http://4rail.net/ref_fast_sokol.html.
[434]Miyauchi, T., T. Nagatomo, T. Tsujimura and H. Tsuchiya, 1999, “Fundamental
Investigations of LCA of Shinkansen Vehicles,” Quarterly Report of the Railway
Technical Research Institute (RTRI), Vol. 40, No. 4, pp. 204-209.
[435]Winkler, S.,How Can Owls Fly Silently?, How Stuff Works. 2012,
http://science.howstuffworks.com/environmental/life/zoology/birds/owl-fly-
silently1.htm.
293
[436]Bachmann, T. and H. Wagner, 2011, “The Three-Dimensional Shape of Serrations
at Barn Owl Wings: Towards a Typical Natural Serration as a Role Model for
Biomimetic Applications,” Journal of Anatomy, Vol. 219, No. 2, pp. 192-202.
[437]Conner, J.,2012, Winter Birds, Mixed Shots, SmugMug. 2012,
http://nacotejack.smugmug.com/Murky-Bird-Pix/Winter-Birds-mixed-
shots/1053283_YhoUo/2/50339724_rfYsU#!i=50339724&k=rfYsU.
[438]Matsumoto, M., K. Masai and T. Wajima,1999, New Technologies for Railway
Trains. Hitachi Review: 134-138.
[439]2006, Pantograph Mechanism of 500 Series Shinkansen Based on Owl Feather.
2012, http://opencage.info/pics.e/large_6708.asp.
[440]Kubotake,2010, 500 Series Shinkansen Set W1 Passing Maibara Station on the
"Nozomi 29" Service, Wikipedia. 2012, http://en.wikipedia.org/wiki/File:
JRW_Shinkansen_Series_500_W1_sets.jpg.
[441]Koganezawa, S., S. Ohtsuka and K. Funabashi, 2011, “Linear Protrusion Structure
on Carriage-Arm Surface for Reduction of Flow-Induced Carriage Vibration in
Hard Disk Drives,” Microsystem Technologies, Vol. 17, No. 5-7, pp. 799-804.
[442]Lang, A. W., 2009, "Chapter 2: The Shark Skin Effect," Functional Properties of
Bio-Inspired Surfaces (E. A. Favret and N. O. Fuentes, Eds.), World Scientific,
Hackensack, NJ, pp. 17-38.
[443]Garcia-Mayoral, R. and J. Jimenez, 2011, “Drag Reduction by Riblets,”
Philosophical Transactions of the Royal Society A, Vol. 369, No. 1940, pp. 1412-
1427.
[444]Airbus,2009, Airbus launches "Sharklet" Large Wingtip Devices for A320 Family
with Commitment from Air New Zealand. 2012, http://www.airbus.com/
newsevents/news-events-single/detail/airbus-launches-sharklet-large-wingtip-
devices-for-a320-family-with-commitment-from-air-new-zealan/.
[445]Vogel, S., 2010, "Moving Heat and Fluids," Bulletproof Feathers (R. Allen, Ed.),
The University of Chicago Press, Chicago, pp. 110-131.
[446]Baleen Filters Pty Limited, 2011, About Baleen: Overview. 2012,
http://www.baleenfilters.com/about.asp.
294
[447]Factzoo.com,2010, Baleen Whales - World's Largest Creature, Filter-Feeders.
2012, http://www.factzoo.com/mammals/worlds-largest-creatures-filter-feeding-
whales.html.
[448]Baleen Filters Pty. Limited, ,2011, The Product: Overview. 2012,
http://www.baleenfilters.com/product.asp.
[449]Obst, Y.,2002, Filter with Counter Flow Clearing. USPTO. United States,
University of South Australia. US 6,354,442 B1.
[450]Water, Waste & Environmental Ltd, 2010, Technologies. 2012, http://ww-
e.co.uk/index.php?p=1_2_Technologies.
[451]JDV Equipment Corporation, 2011, Baleen Filter. 2012,
http://www.jdvequipment.com/baleen-filter.
[452]Baleen Filters Pty Limited, 2011, How to Order. 2012,
http://www.baleenfilters.com/how_to_order.asp.
[453]Obst, Y.,2003, Filter with Counter Flow Clearing. European Patent Office. AT BE
CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE, Baleen Filters Pty
Limited. EP 0946248 B1.
[454]Calera,Carbon Dioxide Technology. 2012, http://calera.com/index.php/technology/
technology_vision/.
[455]King, H.,2012, Limestone, geology.com. 2012, http://geology.com/rocks/
limestone.shtml.
[456]Constantz, B. R., 1986, “Coral Skeleton Construction: A Physiochemically
Dominated Process,” PALAIOS, Vol. 1, No. 2, pp. 152-157.
[457]Sun, H., R. Jain, K. Nguyen and J. Zuckerman, 2010, “Sialite Technology -
Sustainable Alternative to Portland Cement,” Clean Technologies and
Environmental Policy, Vol. 12, pp. 503-516.
[458]Schneider, M., M. Romer, M. Tschudin and H. Bolio, 2011, “Sustainable Cement
Production - Present and Future,” Cement and Concrete Research, Vol. 41, No. 7,
pp. 642-650.
[459]Calera,The Science: Carbonate Formation. 2012, http://calera.com/index.php/
technology/the_science/.
295
[460]Calera,Our Process. 2012, http://calera.com/index.php/technology/our_process/.
[461]Calera,Criteria Pollutant Control. 2012, http://calera.com/index.php/technology/
pollution_control/.
[462]Calera,Electrochemistry. 2012, http://calera.com/index.php/technology/
electrochemistry/.
[463]Calera,2011, Case Study: Moss Landing. 2011, http://www.calera.com/index.php/
case_studies/.
[464]Calera,2011, Frequently Asked Questions. 2011, http://www.calera.com/index.php
/about_us/faqs/.
[465]Kolstad, C. and D. Young,2010, Cost Analysis of Carbon Capture and Storage for
the Latrobe Valley, University of Califonia, Santa Barbara.
[466]Constantz, B. R., A. Youngs and T. C. Holland,2010, CO2-Sequestering Formed
Building Materials. United States. US 7,771684 B2.
[467]Portland Cement Association, 2012, Architectural and Decorative Concrete. 2012,
http://www.cement.org/decorative/overview.asp.
[468]Aubuchon Hardware, 2012, Portland Cement, 47 Lb. 2012, http://paint-and-
supplies.hardwarestore.com/50-276-concrete-patch/portland-cement-221101.aspx.
[469]Nidumolu, R., C. K. Prahalad and M. R. Rangaswami,2009, Why Sustainability Is
Now the Key Driver of Innovation. Harvard Business Review: 57-64.
[470]Lee, H., B. P. Lee and P. B. Messersmith, 2007, “A Reversible Wet/Dry Adhesive
Inspired by Mussels and Geckos,” Nature, Vol. 448, pp. 338-341.
[471]Dolan, R.,2010, Stuck on Mussel Research to Develop Medical Adhsives. Medill
Reports Chicago. Chicago, IL.
[472]Messersmith, P. B., H. Lee and B. P. Lee,2008, Biomimetic Modular Adhesive
Complex: Materials, Methods and Applications Therefore. USPTO. United States.
US 2008/0169059 A1.
[473]Lee, H., S. M. Dellatore, W. M. Miller and P. B. Messersmith, 2007, “Mussel-
Inspired Surface Chemistry for Multifunctional Coatings,” Science, Vol. 318, pp.
426-430.
296
[474]Messersmith Research Group, 2010, Gecko-Mussel Mimetic Adhesive. Evanston,
IL, Northwestern University. 2012, http://biomaterials.bme.
northwestern.edu/gecko.asp.
[475]Greenemeier, L.,2008, Sticky Science: Gecko Toes Key to Adhesive that Doesn't
Lose Its Tackiness. Scientific American.
[476]Greiner, C., 2010, "Gecko-Inspired Nanomaterials," Biomimetic and Bioinspired
Nanomaterials (C. Kumar, Ed.), Wiley, Weinheim, Germany, pp. 1-40.
[477]Johnson, R. N.,1990, Lens-Like Radiant Energy Transmission Control Means.
USPTO. United States, Radiant Optics, Inc. 4,896,656.
[478]Land, M. F., 2000, “Eyes with Mirror Optics,” Journal of Optics A: Pure and
Applied Optics, Vol. 2, No. 6, pp. R44-R50.
[479]Ings, S., 2008, “Darwin 200: An Eye for the Eye,” Nature, Vol. 456, pp. 304-209.
[480]Lohmann, K. J., 2010, “Magnetic-Field Perception,” Nature, Vol. 464, pp. 1140-
1142.
[481]Johnson, R. N.,2004, Radiant Energy Source Systems, Devices, and Methods
Capturing, Controlling, or Recycling Gas Flows. USPTO. United States. US
2004/0255927 A1.
[482]Drillspot,2012, Hot Zone Wall Mount Radiant Heater. 2012,
http://www.drillspot.com/products/1410875/Hot_Zone_HZE15120SW_Electric_I
nfrared_heater.
[483]HotZone,2008, HotZone: History. Sauk Rapids, MN, Schaefer Ventilation
Equipment. 2012, http://www.radiantoptics.com/History.htm.
[484]Schaefer Ventilation Equipment, 2008, Hotzone Radiant Heaters. 2012,
http://www.schaeferfan.com/HOTZONE_RADIANT_HEATERS_C1983.cfm.
[485]Giant Amazon Water Lily Gaining Size, The Living Rainforest. 2012,
http://www.livingrainforest.org/news/giant-amazon-water-lily-gaining-size/.
[486]Ramakrishnan, R. and R. R. Konwar,2010, Wet, Wild, and Wonderful, The Hindu.
2012, http://www.thehindu.com/life-and-style/kids/article98282.ece.
[487]BBC,2004, Crystal Palace. London. 2012, http://www.bbc.co.uk/london/content/
articles/2004/07/27/history_feature.shtml.
297
[488]Wikipedia,2012, The Crystal Palace. 2012, http://en.wikipedia.org/wiki/
The_Crystal_Palace.
[489]2010, Crystal Palace in London, Ask Nature. 2011, http://www.asknature.org/
product/a13b2a14313fcc7123e827269a1d8a73#changeTab.
[490]Leaves Given Structural Support: Giant Water-Lily Ask Nature. 2011,
http://www.asknature.org/strategy/902666afb8d8548320ae0afcd54d02ae.
[491]Attenborough, D., 1995, The Private Life of Plants: A Natural History of Plant
Behaviour, Princeton University Press.
[492]2012, 30" Tulip Stem, GD International China Trade Online. 2012, http://www.gd-
wholesale.com/chinaproduct/mf23d/av1191to1bv/30-tulip-stem-m59743.html.
[493]Hossler, F.,Head of a Human Femur, Science Photo Library. 2012,
http://www.sciencephoto.com/media/118847/enlarge.
[494]2011, The Beauty of the Eiffel Tower, Beautiful Tourism. 2012,
http://www.idntourism.com/the-beauty-of-eiffel-tower/.
[495]Gorb, E. and S. Gorv, 2002, “Contact Separation Force of the Fruit Burrs in Four
Plant Species to Dispersal by Mechanical Interlocking,” Plant Physiology and
Biochemistry, Vol. 40, pp. 373-381.
[496]2012, http://www.forestryimages.org/images/3072x2048/5392712.jpg.
[497]Knight, D. J.,2009, Inspired by Nature. New York State Conservationist, New York
Department of Environmental Conservation. 2012.
[498]de Mestral, G. 1961, Separable Fastening Device. USPTO. United States,
International Velcro Company. 3,009,235.
[499]Use of Velcro, Interesting Topics. 2012, http://www.interestingtopics.net/use-of-
velcro-id-342.
[500]Anderson, T. E.,2005, Velcro Being Pulled Apart (94x), Small World Nikon. 2012,
http://www.nikonsmallworld.com/gallery/year/2005/21.
[501]Gupta, S. M. and P. Veerakamolmal, 2000, "Environmental Issues: Reuse and
Recycling in Manufacturing Systems," Encyclopedia of Production (P. M.
Swamidass, Ed.), Kluwer Academic Publishers, Norwell, MA, pp. 192-197.
298
[502]Justel, D., R. Vidal and M. Chiner, 2005, "TRIZ Applied for Eco-Innovation in
Design for Disassembly," 1st IFIP TC-5 Working Conference on CAI, Ulm,
Germany.
[503]2011, Button Button Whos Got the Button. Norfolk, MA, In the Loop. 2012,
http://keepyourneedleshappy.com/inspiration-of-the-month/button-button-whos-
got-the-button/.
[504]2012, Stock Photo - Detail of a Green Zipper (Slide Fastener) on White
Background, 123RF, http://www.123rf.com/photo_4421188_detail-of-a-green-
zipper-slide-fastener-on-white-background.html.
[505]2009, Science of the Shoelace, Homeschooling 100 Digits,
http://100digits.com/?p=1743.
[506]Chakrabarti, A. and L. H. Shu, 2010, “Biologically Inspired Design,” Artificial
Intelligence for Engineering Design, Analysis, and Manufacturing, Vol. 24, pp.
453-454.
[507]Coelho, D. A. and C. A. M. Versos, 2011, “A Comparative Analysis of Six Bionic
Design Methods,” International Journal of Design Engineering, Vol. 4, No. 2, pp.
114-131.
[508]Vandevenne, D., P.-A. Verhaegen, S. Dewulf and J. R. Duflou, 2012,
"Automatically Populating the Biomimicry Taxonomy for Scalable Systematic
Biologically-Inspired Design," IDETC/CIE 2012, Chicago, IL, DETC2012-
70928.
[509]Glier, M. W., J. Tsenn, J. S. Linsey and D. A. McAdams, 2012, "Evaluating the
Directed Method for Bioinspired Design," IDETC/CIE 2012, Chicago, IL,
DETC2012-71511.
[510]Forbes, P., 2005, "Something New Under the Sun," The Gecko's Foot: Bio-
inspiration: Engineering New Materials from Nature, W.W. Norton & Company,
Inc., New York, NY, pp. 1-28.
[511]Gruber, P., D. Bruckner, C. Hellmich, H.-B. Schmiedmayer, H. Stachelberger and I.
C. Gebeshuber, 2011, "Preface," Biomimetics - Materials, Structures, and
Processes, Springer, New York.
[512]Jenkins, C. H. M., 2005, "Preface," Compliant Structures in Nature and
Engineering (C. H. M. Jenkins, Ed.), WIT Press, Billerica, MA.
299
[513]Yang, H. T. Y., C.-H. Lin, D. Bridges, C. J. Randall and P. K. Hansma, 2010, “Bio-
Inspired Passive Actuator Simulating an Abalone Shell Mechanism for Structural
Control,” Smart Materials and Structures, Vol. 19, No. 10.
[514]Sartori, J., U. Pal and A. Chakrabarti, 2010, “A Methodology for Supporting
"Transfer" in Biomimetic Design,” Artificial Intelligence for Engineering Design,
Analysis, and Manufacturing, Vol. 24, pp. 483-505.
[515]Tarascon, J.-M., 2008, “Towards Sustainable and Renewable Systems for
Electrochemical Energy Storage,” ChemSUSChem, Vol. 1, No. 8-9, pp. 777-779.
[516]Vincent, J. F. V., 2005, "Compliant Structures and Materials in Animals,"
Compliant Structures in Nature and Engineering (C. H. M. Jenkins, Ed.), WIT
Press, Billerica, MA, pp. 3-20.
[517]Jenkins, C. H. M., 2005, "Design of Compliant Structures," Compliant Structures in
Nature and Engineering (C. H. M. Jenkins, Ed.), WIT Press, Billerica, MA, pp.
247-261.
[518]Glier, M. W., J. Tsenn, J. S. Linsey and D. A. McAdams, 2011, "Methods for
Supporting Bioinspired Design," International Mechanical Engineering Congress
& Exposition, Denver, Colorado, IMECE2011-63247.
[519]Meijer, K., J. C. Moreno and H. H. C. M. Savelberg, 2006, "Biological Mechanisms
as Models for Mimicking: Sarcomere Design, Arrangement and Muscle
Function," Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.),
CRC Press, Boca Raton, FL, pp. 41-56.
[520]Ummat, A., A. Dubey and C. Mavroidis, 2006, "Bio-Nanorobotics: A Field Inspired
by Nature," Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen,
Ed.), CRC Press, Boca Raton, FL, pp. 201-227.
[521]Bar-Cohen, Y., 2006, "Artificial Muscles Using Electroactive Polymer,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC
Press, Boca Raton, FL, pp. 267-290.
[522]Szema, R. and L. P. Lee, 2006, "Biologically Inspired Optical Systems,"
Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.), CRC
Press, Boca Raton, FL, pp. 291-308.
300
[523]Carlson, J., S. Ghaey, S. Moran, C. A. Tran and D. L. Kaplan, 2006, "Biological
Materials in Engineering Mechanisms," Biomimetics:Biologically Inspired
Technologies (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 365-379.
[524]Lou, Z., S. Hosoe and M. Ito, 2006, "Biomimetic and Biologically Inspired
Control," Biomimetics: Biologically Inspired Technologies (Y. Bar-Cohen, Ed.),
CRC Press, Boca Raton, FL, pp. 399-425.
[525]Plamondon, N. and M. Nahon, 2009, “A Trajectory Tracking Controller for an
Underwater Hexapod Vehicle,” Bioinspiration and Biomimetics, Vol. 4, No. 3,
pp. 036005.
[526]Armour, R., K. Paskins, A. Bowyer, J. Vincent and W. Megill, 2007, “Jumping
Robots: A Biomimetic Solution to Locomotion Across Rough Terrain,”
Bioinspiration and Biomimetics, Vol. 2, No. 3, pp. S65-S82.
[527]Dabiri, J. O., 2007, “Renewable Fluid Dynamic Energy Derived from Aquatic
Animal Locomotion,” Bioinspiration and Biomimetics, Vol. 2, No. 3, pp. L1-L3.
[528]Gopal, V. and M. J. Z. Hartmann, 2007, “Using Hardware Models to Quantify
Sensory Data Acquisition Across the Rat Vibrissal Array,” Bioinspiration and
Biomimetics, Vol. 2, No. 4, pp. S135-S145.
[529]Nakrani, S. and C. Tovey, 2007, “From Honeybees to Internet Servers: Biomimicry
for Distributed Management of Internet Hosting Centers,” Bioinspiration and
Biomimetics, Vol. 2, No. 4, pp. S182-S197.
[530]Margerie, E. d., J. Mouret, S. Doncieux and J.-A. Meyer, 2007, “Artificial
Evolution of the Morphology and Kinematics in a Flapping-Wing Mini-UAV,”
Bioinspiration and Biomimetics, Vol. 2, No. 4, pp. 65-82.
[531]Bartol, I., M. Gordon, P. Webb, D. Weihs and M. Gharib, 2008, “Evidence of Self-
Correcting Spiral Flows in Swimming Boxfishes,” Bioinspiration and
Biomimetics, Vol. 3, No. 1, pp. 014001.
[532]Myrick, A., K.-C. Park, J. R. Hetling and T. C. Baker, 2008, “Real-Time Odor
Discrimination Using a Bioelectronic Sensor Array Based on the Insect
Electroantennogram,” Bioinspiration and Biomimetics, Vol. 3, No. 4, pp. 046006.
[533]Sarikaya, M., J. Liu and I. A. Aksay, 1995, "Nacre: Properties, Crystallography,
Morphology, and Formation," Biomimetics: Design and Processing of Materials
(M. Sarikaya and I. A. Aksay, Eds.), AIP Press, Woodbury, New York, pp. 35-90.
301
[534]Mann, S., 1995, "Biomineralization, the Inorganic-Organic Interface, and Crystal
Engineering," Biomimetics: Design and Processing of Materials (M. Sarikaya and
I. A. Aksay, Eds.), AIP Press, Woodbury, New York, pp. 91-116.
[535]Calvert, P., 1995, "Biomimetic Ceramics and Hard Composites," Biomimetics:
Design and Processing of Materials (M. Sarikaya and I. A. Aksay, Eds.), AIP
Press, Woodbury, New York, pp. 145-161.
[536]Vattam, S. S., M. Helms and A. K. Goel, 2010, "Biologically Inspired Design: A
Macrocognitive Account," IDETC/CIE 2010, Montreal, Canada, DETC2010-
28567.
[537]Potter, K. A., B. Gui and J. R. Capadona, 2012, "Biomimicry at the Cell-Material
Interface," Biomimetics: Nature-Based Innovation (Y. Bar-Cohen, Ed.), CRC
Press, Boca Raton, FL, pp. 95-129.
[538]Fish, F. E., A. J. Smits, H. Haj-Hariri, H. Bart-Smith and T. Iwasaki, 2012,
"Biomimetic Swimmer Inspired by the Manta Ray," Biomimetics: Nature-Based
Innovation (Y. Bar-Cohen, Ed.), CRC Press, Boca Raton, FL, pp. 495-523.
[539]Weiner, S. and P. Zaslansky, 2004, "Structure-Mechanical Function Relations in
Bones and Death," Learning from Nature How to Design New Implantable
Biomaterials: From Biomineralization Fundamentals to Biomimetic Materials
and Processing Routes (R. L. Reis and S. Weiner, Eds.), Kluwer Academic
Publishers, Dordrecht, The Netherlands, pp. 3-13.
[540]Aizenberg, J. and G. Hendler, 2004, "Learning from Marine Creatures How to
Design Micro-Lenses," Learning from Nature: How to Design New Implantable
Biomaterials: From Biomineralization Fundamentals to Biomimetic Materials
and Processing Routes (R. L. Reis and S. Weiner, Eds.), Kluwer Academic
Publishers, Dordrecht, The Netherlands, Vol. 171, pp. 151-166.
[541]Isaacson, A.,2009, Nature Inspiring Green Design for Planes, Train, Autos & More.
Popular Mechanics.
[542]Freedman, M.,2010, Nature is the Model Factory. Newsweek.
[543]Offner, D. H., 1995, "Introduction to Design Homology," Design Homology: An
Introduction to Bionics, David Offner, Urbana, Illinois, pp. 1-12.
[544]Reis, R. L., 2004, "Preface," Learning from Nature How to Design New Implantable
Biomaterials: From Biomimeralization Fundamentals to Biomimetic Materials
302
and Processing Routes (R. L. Reis and S. Weiner, Eds.), Kluwer Academic
Publishers, Dordrecht, The Netherlands, pp. xi-xiv.
[545]Biomimicry Institute, 2010, B.I.A.S. Biologically Inspired Acoustic Systems, Ask
Nature. 2010, http://www.asknature.org/product/0fdee3b68d08f0750097
11803dc93c16.
[546]Biomimicry Institute, 2009, bioBASE Mooring System, Ask Nature. 2010,
http://www.asknature.org/product/0af0cefd471050bcc5de19367aae3237.
[547]Biomimicry Institute, 2010, BioFriend Anti-Microbial, Ask Nature. 2010,
http://www.asknature.org/product/4535c47d225d0585cd4139133629f19d.
[548]Biomimicry Institute, 2010, Bioinspired Adhesive Tape, Ask Nature. 2010,
http://www.asknature.org/product/2dbddc320a256b0c84fb3ef7b9131e1d.
[549]Biomimicry Institute, 2010, Bioinspired Material Adhesive, Ask Nature. 2010,
http://www.asknature.org/product/65bba2940a2ce1e9de9f0e2e0164ced3.
[550]Biomimicry Institute, 2010, Biomatrica Sample Matrix, Ask Nature. 2010,
http://www.asknature.org/product/df78111ca0805a840a4b9a32628d9c79.
[551]Biomimicry Institute, 2010, Biopolymers, Ask Nature. 2010,
http://www.asknature.org/product/a3dda50e918bfd34b509b96f2ca62979.
[552]Biomimicry Institute, 2008, BioSTREAM Tidal Energy, Ask Nature. 2010,
http://www.asknature.org/product/a3676b91b1431c1727ab8517d1575f5e.
[553]Biomimicry Institute, 2010, Capillary Faucets, Ask Nature. 2010,
http://www.asknature.org/product/7a6f6ce2f13399d9f9dcbc2bfae10d1b.
[554]Biomimicry Institute, 2010, Carbon Dioxide-Based Plastics, Ask Nature. 2010,
http://www.asknature.org/product/c3143ba9e46e4adafb11645a7f1b7b95.
[555]Biomimicry Institute, 2010, ChromaFlair Color-Shifting Paints, Ask Nature. 2010,
http://www.asknature.org/product/b3a96e92b68e9de4226c40e058409d30.
[556]Biomimicry Institute, 2010, Dew Bank Bottle, Ask Nature. 2010,
http://www.asknature.org/product/313a2fdcdc072fbfc7ae7e69962eab80.
[557]Biomimicry Institute, 2010, Dye Solar Cell Technology, Ask Nature. 2010,
http://www.asknature.org/product/313a2fdcdc072fbfc7ae7e69962eab80.
303
[558]Biomimicry Institute, 2010, Wastewater Treatment Without Chemicals, Ask Nature.
2010, http://www.asknature.org/product/d0a39e225aea22ee036e9602369c6ee0.
[559]Biomimicry Institute, 2010, FLOWE Wind Farm Design, Ask Nature. 2010,
http://www.asknature.org/product/20015e39f852cfc1382828afef82b916.
[560]Biomimicry Institute, 2010, Fog-Catching Materials, Ask Nature. 2010,
http://www.asknature.org/product/ce46c846e11fb2e99eff7f1143df3bd3.
[561]Biomimicry Institute, 2009, Goatek Traction Hiking Sole, Ask Nature. 2010,
http://www.asknature.org/product/e53fed91dd6e8d4a348f3454493d4c90.
[562]Biomimicry Institute, 2009, GreenShield Fabric Finish, Ask Nature. 2010,
http://www.asknature.org/product/28dac96ae850e0972f1a61db94844994.
[563]Biomimicry Institute, 2010, GROW Solar Ivy, Ask Nature. 2010,
http://www.asknature.org/product/256b9f497821497773d9f0c442ab367a.
[564]Biomimicry Institute, 2010, Heliotrope Sun-Tracking System, Ask Nature. 2010,
http://www.asknature.org/product/347aedb6508fed4c9a373bf3fc7eca65.
[565]Biomimicry Institute, 2009, Humidity Responsive Fibers, Ask Nature. 2010,
http://www.asknature.org/product/f09a2bc54034f51a9084bd423524cb60.
[566]Biomimicry Institute, 2010, Humidity Sensor, Ask Nature. 2010,
http://www.asknature.org/product/971a4991263e78d44efcbe5a3053d159.
[567]Biomimicry Institute, 2009, IntAct Labs, LLC Biosensor, Ask Nature. 2010,
http://www.asknature.org/product/7084aacc31039ca27ab8fd02ffbbcd98.
[568]Biomimicry Institute, 2009, Joinlox, Ask Nature. 2010,
http://www.asknature.org/product/0e663bb73680a395ec14d29d02f6a5ae.
[569]Biomimicry Institute, 2009, Kalundborg Industrial Symbiosis, Ask Nature. 2010,
http://www.asknature.org/product/b08979c20b2d379a8af64fa83826db34.
[570]Biomimicry Institute, 2010, LOCUST Visual Collision Detector, Ask Nature. 2010,
http://www.asknature.org/product/4912392abba072c917725028dc47c2c7.
[571]Biomimicry Institute, 2008, Lotus Clay Roofing Tiles, Ask Nature. 2010,
http://www.asknature.org/product/aaef0c685b83f9240a61863b8a27b81e.
304
[572]Biomimicry Institute, 2008, Lotusan Paint, Ask Nature. 2010,
http://www.asknature.org/product/6b8342fc3e784201e4950dbd80510455.
[573]Biomimicry Institute, 2010, Mechanically Adaptive Polymer Nanocomposites, Ask
Nature. 2010, http://www.asknature.org/product/4482a19d387bc20978550e
7490799fbd.
[574]Biomimicry Institute, 2010, Medical Implant Coating, Ask Nature. 2010,
http://www.asknature.org/product/c16a58d2f0fb8a4b6098ef89f1fbce29.
[575]Biomimicry Institute, 2010, Microfluidic Silk Assembly, Ask Nature. 2010,
http://www.asknature.org/product/db078b01d8a8cda426c5d81317034080.
[576]Biomimicry Institute, 2010, Mincor TX TT Textile Coating, Ask Nature. 2010,
http://www.asknature.org/product/b0b23316d7587d93d3e5891df168d19e.
[577]Biomimicry Institute, 2010, Morphotex Structural Colored Fibers, Ask Nature.
2010, http://www.asknature.org/product/4c0e62f66bcccabf55a1f189da30acb3.
[578]Biomimicry Institute, 2010, MothEYE and MARAG Films, Ask Nature. 2010,
http://www.asknature.org/product/b7fd4cfaf7380bb1f00e8759cfddc7e6.
[579]Biomimicry Institute, 2010, NanoSphere Fabric Finish, Ask Nature. 2010,
http://www.asknature.org/product/600e2a50746fa6339870554b2a7a36fd.
[580]Biomimicry Institute, 2010, ORNILUX, Ask Nature. 2010,
http://www.asknature.org/product/077e9d44e8e12f039458729f8de1ada9.
[581]Biomimicry Institute, 2010, Pangolin Backpack, Ask Nature. 2010,
http://www.asknature.org/product/cb31d079e6398e2c9e78e92443940a11.
[582]Biomimicry Institute, 2010, PAX Water Mixer, Ask Nature. 2010,
http://www.asknature.org/product/1a119e978284900963298a0aac59a120.
[583]Biomimicry Institute, 2009, PaxFan Fans, Ask Nature. 2010,
http://www.asknature.org/product/91eebf530a565f2024b894d7dd661733.
[584]Biomimicry Institute, 2010, Phillips Head Protection Systems (PHPS), Ask Nature.
2010, http://www.asknature.org/product/52b0b0cd3c9afbf7d6cbb8ed83aac6af.
[585]Biomimicry Institute, 2010, Platelet Technology Leak Sealer, Ask Nature. 2010,
http://www.asknature.org/product/897d0e619743c41d4cbb528e1a8bac95.
305
[586]Biomimicry Institute, 2010, Polar Thermos Cozy, Ask Nature. 2010,
http://www.asknature.org/product/2d8d7cd3ed6cb2ee83704bf7ebf161dc.
[587]Biomimicry Institute, 2010, Power Plastic Solar Cell Technology, Ask Nature.
2010, http://www.asknature.org/product/a21fcbc8ff5a053c793164e3fdffc249.
[588]Biomimicry Institute, 2010, PureBond Technology, Ask Nature. 2010,
http://www.asknature.org/product/22aa5601fcdb68b5d2dc9e3d3a22f7f1.
[589]Biomimicry Institute, 2008, Self-Cleaning Fabric, Ask Nature. 2010,
http://www.asknature.org/product/a0c03b1905b495f3b8d65728b09c8ae3.
[590]Biomimicry Institute, 2008, Self-Cleaning Optical Coatings, Ask Nature. 2010,
http://www.asknature.org/product/ea0c697201031255bfcbc2f6a22a7a99.
[591]Biomimicry Institute, 2010, Self-Cleaning Surface, Ask Nature. 2010,
http://www.asknature.org/product/a0c03b1905b495f3b8d65728b09c8ae3.
[592]Biomimicry Institute, 2008, Soil-Moving Equipment, Ask Nature. 2010,
http://www.asknature.org/product/012cdf8145f7d47924ce686a9fb033a0.
[593]Biomimicry Institute, 2010, Solar Water Still and Pump, Ask Nature. 2010,
http://www.asknature.org/product/1c404f66d0f4746f5f4810a2a92ecf1c.
[594]Biomimicry Institute, 2010, Stabilitech Vaccine Stabilization Technology, Ask
Nature. 2010, http://www.asknature.org/product/107c8e637bde3ccd25f19
fc97ce20f7b.
[595]Biomimicry Institute, 2010, Swiss Re Building, Ask Nature. 2010,
http://www.asknature.org/product/b8b39318c66e6c873137da2910785413.
[596]Biomimicry Institute, 2010, Sycamore Ceiling Fan, Ask Nature. 2010,
http://www.asknature.org/product/dd0648940077b68055b2a01cac1f50cc.
[597]Biomimicry Institute, 2010, VitRIS and HydRIS Vaccine Stabilization Technologies,
Ask Nature. 2010, http://www.asknature.org/product/fd6de0964dc5224631
c8d67aa3713937.
[598]Biomimicry Institute, 2010, Water-Repellent Ship Coatings. 2010,
http://www.asknature.org/product/b554d0e2babb24b9bb6858b889ea8178.
[599]Mengesha, T. E., R. R. Vallance and R. Mittal, 2011, “Stiffness of Desiccating
Insect Wings,” Bioinspiration and Biomimetics, Vol. 6, No. 1, pp. 014001.
306
[600]Chiadini, F., V. Fiumara, A. Scaglione and A. Lakhtakia, 2011, “Simulation and
Analysis of Prismatic Bioinspired Compound Lenses for Solar Cells: II.
Multifrequency Analysis,” Bioinspiration and Biomimetics, Vol. 6, No. 1, pp.
014002.
[601]Myrick, A. and T. Baker, 2011, “Locating a Compact Odor Source Using a Four-
Channel Insect Electroantennogram Sensor,” Bioinspiration and Biomimetics,
Vol. 6, No. 1, pp. 016002.
[602]French, J. J. R. and B. M. Ahmed, 2010, “Commentary: The Challenge of
Biomimetic Design for Carbon-Neutral Buildings Using Termite Engineering,”
Insect Science, Vol. 17, No. 2, pp. 154-162.
[603]Talk, T.,2011, A Robot that Flies Like a Bird, http://www.youtube.com/
watch?v=Fg_JcKSHUtQ&feature=player_embedded&noredirect=1.
[604]Bhushan, B. and M. Nosonovsky, 2010, “The Rose Petal Effect and the Modes of
Superhydrophobicity,” Philosophical Transactions of the Royal Society A, Vol.
368, No. 1929, pp. 4713-4728.
[605]NIOSCH,2010, Trichloroethylene, Centers for Disease Control and Prevention
(CDC). 2012, http://www.cdc.gov/niosh/npg/npgd0629.html.
[606]DOW,2010, Chlorinated Solvents Biodegradability. DOW Answer Center, The
DOW Chemical Company. 2012, https://dow-answer.custhelp.com/app/
answers/detail/a_id/1338/kw/chlorinated%20solvents%20biodegradability.