Navigation Links
Amazing skin gives sharks a push
Date:2/9/2012

Streamlined sharks are legendary for their effortless swimming. George Lauder from Harvard University, USA, explains that the fish have long inspired human engineers, but more recently attention has focused on how the fish's remarkable skin boosts swimming. Coated in razor sharp tooth-like scales, called denticles, the skin is thought to behave like the dimples on a golf ball, disturbing the flow of water over the surface to reduce the drag. But something didn't quite sit right with Lauder. 'All of the shark skin studies were done on flat shark skin mimics that were held straight and immovable. But shark skin moves', recalls Lauder. So, when Masters student Johannes Oeffner joined his lab, Lauder suggested that they take a look at the fluid dynamics of shark skin and its analogues to find out how the fish's motion affects fluid flowing over the rough surface. The duo publishes its discovery that shark skin actually generates thrust to give the fish an additional boost in The Journal of Experimental Biology at http://jeb.biologists.org/.

But first the scientists had to get hold of some fresh shark skin, so they went to a market in Boston where they found several large makos. Back in the lab, Oeffner carefully removed sections from a mako's skin and attached them to both sides of a rigid aluminium foil. Then he immersed the foil in a flow tank, reproduced the swimming motion of a fish by wiggling it from side to side and measured the rigid 'swimming' foil's speed by matching it with the flow of water moving in the opposite direction.

Having measured the foil's swimming speeds with intact skin compete with denticles Oeffner carefully sanded off the denticles and set the foil swimming again. However, instead of slowing down as the duo had expected the denticle-free foil speeded up. So the shark skin's denticle surface impeded the rigid swimmer. 'But then we remembered our premise that the sharks
'/>"/>

Contact: Kathryn Knight
kathryn@biologists.com
44-078-763-44333
The Company of Biologists
Source:Eurekalert

Page: 1 2

Related biology news :

1. The amazing maze of maize evolution
2. Scientists find amazing new pondlife on nature reserve
3. See amazing new sun images from NJITs Big Bear Solar Observatory
4. Frogs amazing leaps due to springy tendons
5. Rare genetic disorder gives clues to autism, epilepsy, mental retardation
6. Dunn Foundation gives Rice $3M for collaborative research grants
7. Soybean grant gives researchers tools to unravel better bean
8. UBC researcher gives first-ever estimate of worldwide fish biomass and impact on climate change
9. Gardening gives older adults benefits like hand strength and self esteem
10. Gardening gives older adults benefits like hand strength and self-esteem
11. Worlds biggest snake gives climate clues
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/30/2015)... , July 30, 2015 Cellecta, ... for gene function analysis and biomarker discovery, announced ... (sgRNA) Knockout Library targeting all human protein coding ... permanently "knock out" a gene,s function. Cellecta,s new ... high throughput screening tool so that researchers can ...
(Date:7/23/2015)... 2015 Research and Markets ( http://www.researchandmarkets.com/research/rzzp3v/global_outlook_of ... "Global Outlook of the Biometrics Industry 2015 " ... The global biometrics market is likely to witness ... owing to the uptake of multiple technologies available. ... enhances the growth of biometrics in existing applications ...
(Date:7/20/2015)... 2015  Acuity Market Intelligence,s latest research "The ... Commerce and Privacy" forecasts that between 2014 and ... be downloaded to smart mobile devices by 2.2 ... is projected to generate more than $67.9 billion ... forecast period.    "Biometrics is at ...
Breaking Biology News(10 mins):CELLECTA, INC. Announces Launch of Human Whole Genome CRISPR Knockout Library 2Global Outlook of the Biometrics Industry 2015 2Global Outlook of the Biometrics Industry 2015 3Biometrics on Smart Mobile Devices to Redefine Digital Identity with 12.9 Billion Biometric App Downloads between 2014 and 2020 2
... associate professor Karen Warkentin, working at the Smithsonian ... that frog embryos at a very early developmental ... eggas reported in the Nov. 7, 2008 issue ... These initial responses to the environment may be ...
... receive all recommended flu vaccine appear to be less likely ... 20,000 children every year. This is according to new ... Rochester Medical Center. The study looked at children between 6 ... years old in 2003-2004 and 2004-2005. The study found that, ...
... cause human blood and plasma to clota process that ... course of vertebrate evolution, according to new research at ... Infectious Diseases, and Institut Pasteur in Paris. Their findings ... Chemical Biology . , The discovery will improve scientists, ...
Cached Biology News:Red-eyed treefrog embryos actively avoid asphyxiation inside their eggs 2Flu shot protects kids -- even during years with a bad vaccine match 2Nature study demonstrates that bacterial clotting depends on clustering 2
(Date:8/3/2015)... Aug. 3, 2015  Merck KGaA, Darmstadt, ... top-quality high-tech products in the healthcare, life science and ... company Nano-C, their development and launch of promising new ... (OPV). Merck KGaA, Darmstadt, Germany , ... OPV sector. Novel derivatives: highly stable, easy ...
(Date:8/3/2015)... 2015   Intrexon Corporation (NYSE: XON ... second quarter 2015 financial results after the market closes ... will host a conference call at 5:30 PM ET ... update. The conference call may be accessed ... asking to join the "Intrexon Corporation Call."  Participants may ...
(Date:7/31/2015)... July 31, 2015 In today,s fast ... help them drive positive health outcomes, improve profitability ... of patient care in their communities. At ThoughtSpot ... and conference, AmerisourceBergen announced a new set of ... Administration Organization and help independent pharmacies endure the ...
(Date:7/30/2015)... ... ... Ralco is honored to announce that it is the primary sponsor of ... 5-9 in Marshall. The Ralco Enrichment Center is an interactive experience where the public ... daily lives. This unique exhibit also features a birthing center for fair goers to ...
Breaking Biology Technology:Merck KGaA, Darmstadt, Germany, and Nano-C Present Enhanced Materials for Organic Photovoltaics 2Merck KGaA, Darmstadt, Germany, and Nano-C Present Enhanced Materials for Organic Photovoltaics 3Merck KGaA, Darmstadt, Germany, and Nano-C Present Enhanced Materials for Organic Photovoltaics 4Intrexon to Announce First Half and Second Quarter 2015 Financial Results and Host Conference Call on August 10th 2AmerisourceBergen Unveils Suite of Enhanced Capabilities for Independent Pharmacies at ThoughtSpot 2015 2AmerisourceBergen Unveils Suite of Enhanced Capabilities for Independent Pharmacies at ThoughtSpot 2015 3Ralco Announces Primary Sponsorship of Ralco Enrichment Center at Lyon County Fair 2
... NEW YORK, Sept. 6, 2011 Reportlinker.com announces ... available in its catalogue: ... http://www.reportlinker.com/p0610872/Industrial-Biotechnology-China-News-1108.html#utm_source=prnewswire&utm_medium=pr&utm_campaign=Biotechnology In ... break the foreign enterprises, monopoly in the ...
... is invisible it,s at the farthest end of the ... explosives at the airport to designing drugs to diagnosing skin ... Department of Energy,s Lawrence Berkeley National Laboratory (Berkeley Lab) and ... device made of graphene the remarkable form of carbon ...
... , , , , ... AUDIO: This audio file is a brief ... Click here for more information. , ... , , , , ...
Cached Biology Technology:Industrial Biotechnology China News 1108 2Industrial Biotechnology China News 1108 3A whole new light on graphene metamaterials 2A whole new light on graphene metamaterials 3MIABE standard opens up new opportunities in drug discovery 2MIABE standard opens up new opportunities in drug discovery 3
Mycoplasma tested...
... SAGE (serial analysis of gene ... expression analysis. Expression profiles generated ... to detect low-abundance transcripts making ... genes. The I-SAGE Kit is ...
Human LAIR2 Biotinylated Affinity Purified PAb...
... The mycobacteria in ... cells to the injection site which enhances ... Freund's Adjuvant is used for the initial ... the subsequent boosts. Antigens (preferably in saline) ...
Biology Products: