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Tokek gecko tetap menggenggam dalam habitat alami basah
.........Kemampuan Tokek batu untuk
menempel di pohon dan
daun selama hujan telah terpesona ilmuwan selama beberapa dekade, ........ sekelompok
peneliti untuk memecahkan misteri...................
Geckos keep firm grip in wet natural habitat
Date:
April 1,
2013
Source:
University of Akron
Summary:
Geckos' ability to stick to trees
and leaves during rainforest downpours has fascinated scientists for decades,
leading a group of researchers to solve the mystery.
.........................
Geckos' ability to stick to trees and leaves during
rainforest downpours has fascinated scientists for decades, leading a group of
University of Akron researchers to solve the mystery.
They
discovered that wet, hydrophobic (water-repellent) surfaces like those of
leaves and tree trunks secure a gecko's grip similar to the way dry surfaces
do. The finding brings UA integrated bioscience doctoral candidate Alyssa Stark
and her research colleagues closer to developing a synthetic adhesive that
sticks when wet.
Principal
investigator Stark and her fellow UA researchers Ila Badge, Nicholas Wucinich,
Timothy Sullivan, Peter Niewiarowski and Ali Dhinojwala study the adhesive
qualities of gecko pads, which have tiny, clingy hairs that stick like Velcro
to dry surfaces. In a 2012 study, the team discovered that geckos lose their
grip on wet glass. This finding led the scientists to explore how the lizards
function in their natural environments.
The
scientists studied the clinging power of six geckos, which they outfitted with
harnesses and tugged upon gently as the lizards clung to surfaces in wet and
dry conditions.
Link between
adhesion and 'wettability'
The
researchers found that the effect of water on adhesive strength correlates with
wettability, or the ability of a liquid to maintain contact with a solid
surface. On glass, which has high wettability, a film of water forms between
the surface and the gecko's foot, decreasing adhesion.
Conversely,
on surfaces with low wettability, such as waxy leaves on tropical plants, the
areas in contact with the gecko's toes remain dry and adhesion, firm.
"The
geckos stuck just as well under water as they did on a dry surface, as long as
the surface was hydrophobic," Stark explains. "We believe this is how
geckos stick to wet leaves and tree trunks in their natural environment."
The
discovery, "Surface Wettability Plays a Significant Role in Gecko Adhesion
Underwater," was published April 1, 2013 by the Proceedings of the
National Academy of Sciences. The study has implications for the design of
a synthetic gecko-inspired adhesive.
Story
Source:
The above
story is based on materials provided by University of Akron. Note: Materials may be edited
for content and length.
Journal
Reference:
- A. Y. Stark, I. Badge, N. A. Wucinich, T. W. Sullivan, P. H. Niewiarowski, A. Dhinojwala. Surface wettability plays a significant role in gecko adhesion underwater. Proceedings of the National Academy of Sciences, 2013; DOI: 10.1073/pnas.1219317110
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