Navigation Links
Otter adaptations: How do otters remain sleek and warm

Otters cavorting in the water is a scene with which we're all familiar. Yet, unlike many other mammals that spend a considerable amount of time in the water–polar bears, seals, dolphins, and whales–river otters do not have a thick layer of body fat to keep warm. They rely, instead, on a few unique adaptations; namely, their fur and the densely packed layer of specially adapted underhairs.

Using scanning electron microscopy and polarizing light microsopy, John W. Weisel, PhD, Professor of Cell and Developmental Biology at the University of Pennsylvania School of Medicine, and colleagues, examined the structure of these hairs for clues to their exceptional insulation abilities. They found that the cuticle surface structure of the underhairs and base of the less-abundant guard hairs are distinctively shaped to interlock, with wedge-shaped fins or petals fitting into wedge-shaped grooves between fins of adjacent hairs. Weisel and colleagues report their findings in the Canadian Journal of Zoology.

Weisel and Research Specialist Chandrasekaran Nagaswami, MD, also in Penn's Department of Cell and Developmental Biology, usually work on defining the physical properties of blood clots and applying this knowledge to find better treatments for heart disease. Two years ago when Weisel, an avid hiker, climber, and white-water kayaker, took a month of his sabbatical year to study wolves–a life-long interest–on Isle Royale National Park in Lake Superior, Michigan, he also collected hair samples from the island's mammals--including wolves, moose, and otters. (The ecological studies of wolves and moose on Isle Royale, which started in 1959, are part of the longest-running animal ecology study in the world. Isle Royale has been a training ground for many ecologists, and lessons learned here have been applied to the re-introduction of wolves to Yellowstone National Park.)

Weisel examined wolf prey hair with light and electron microscopy with the idea of accurate
'"/>

Source:University of Pennsylvania School of Medicine


Page: 1 2 3

Related biology news :

1. Exxon Valdez oil found in tidal feeding grounds of ducks, sea otters
2. Fitting in: Newly evolved genes adopt a variety of strategies to remain in the gene pool
3. Students discover 11,000 year old remains of Irish Elk
4. Soil-bound prions that cause CWD remain infectious
5. How ancient whales lost their legs, got sleek and conquered the oceans
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Otter adaptations How otters remain sleek and warm

(Date:8/21/2014)... RUSTON, La. A team of researchers ... innovative method for using affordable, consumer-grade 3D ... implants that can contain antibacterial and chemotherapeutic ... team comprised of doctoral students and research ... nanosystems engineering programs collaborated to create filament ...
(Date:8/21/2014)... Carolina State University have developed a novel and versatile ... applications for creating new materials as well as for ... technique allows us to model much larger and more ... quickly," says Nan Li, lead author of a paper ... State,s Department of Materials Science and Engineering. "This is ...
(Date:8/20/2014)... a John and Rebecca Moores Professor of Biology and Biochemistry ... in the International Society for the Study of the Origin ... members two from the U.S., one from France and ... are elected every three years, and 36 have been named ... 20 countries, the ISSOL includes researchers from disciplines as varied ...
Breaking Biology News(10 mins):Louisiana Tech University researchers use 3D printers to create custom medical implants 2Louisiana Tech University researchers use 3D printers to create custom medical implants 3Researchers develop models to study polyelectrolytes, including DNA and RNA 2UH professor named fellow by International Astrobiology Society 2
... mouth bacteria behaving badly and the hundreds of microbial ... of the highlights at the Society for General Microbiology,s ... event takes place on 6-9 September at the Jubilee ... will present cutting-edge scientific research covering a wide range ...
... Ohio Normally, the brilliant red of a male cardinal ... that may not be true of cardinals living in urban ... bright red feather coloration of male northern cardinals (Cardinalis cardinalis) ... urban forests than it is for those in rural forests. ...
... Penetrating pores . . . Using neutron scattering ... of the country, Larry Anovitz, David Cole and Gernot Rother ... geologic processes. The researchers are especially interested in studying how ... can range from nano-scale to room-size and are a primary ...
Cached Biology News:Study: The bright red of cardinals means less in urban areas 2Story tips from the US Department of Energy's Oak Ridge National Laboratory, September 2010 2Story tips from the US Department of Energy's Oak Ridge National Laboratory, September 2010 3
(Date:8/21/2014)... 2014 ... the addition of the  "Global Hormone Replacement ...      (Logo: http://photos.prnewswire.com/prnh/20130307/600769) ,Hormone replacement ... a means of replacing hormones that are ... This type of therapy is usually initiated ...
(Date:8/21/2014)... New Rochelle, N.Y. (PRWEB) August 21, 2014 ... it is the first private college in the Mid-Hudson ... The College will now begin accepting applications from qualified ... , “We are very pleased to have been ... to support Governor Cuomo’s transformative initiative to stimulate economic ...
(Date:8/21/2014)... NEW YORK , Aug. 21, 2014 /PRNewswire/ ... OTCM) congratulates Immune Pharmaceuticals Inc., a biotechnology company, ... Capital Market.  Immune previously traded on OTCQX®, the ... operated by OTC Markets Group. Logo - ... Immune Pharmaceuticals on the successful execution of its ...
(Date:8/21/2014)... Chester, NJ (PRWEB) August 21, 2014 ... of personal selling optimization technology and services for ... publication of “Grading Pharma’s Use of New Commercial ... of Measurement & Analytics. , The article examines ... marketing yield that are being tested in the ...
Breaking Biology Technology:Global Hormone Replacement Therapy Market 2014-2018: Key Vendors are Actavis, Bayer, Merck & Co, Novartis and Novo Nordisk 2The College of New Rochelle Becomes First Private College in Mid-Hudson Region to Earn START-UP NY Designation 2The College of New Rochelle Becomes First Private College in Mid-Hudson Region to Earn START-UP NY Designation 3OTC Markets Group Congratulates Immune Pharmaceuticals on NASDAQ Listing 2Pursuit's Peter Robinson Publishes "Grading Pharma's Use of New Commercial Sales Models" 2
... 14 (http://www.amdl.com ) AMDL,Inc., (Amex: ADL ... in China and the US, announced that the,AMDL-ELISA DR- ... useful test for the,detection of cancer in clinical practice ... Medical Department II at the University Hospital,in Frankfurt Germany. ...
... Liquids) will be held in Göteborg, Sweden on October 13-14, 2008 ... discussing commercialization of BTL. Technological advancements & worldwide growth of BTL ... insights on biomass to liquid industry prospect , ... ...
... Rankings Include 170 Hospitals and Medical Centers in 16 Specialties, ... 19 Hospitals Included in ... Group today,announced the 2008 publication of America,s Best Hospitals, accessible,today ... July 14., Authoritative and influential, the 2008 America,s Best ...
Cached Biology Technology:AMDL ELISA DR-70(R) (FDP) is Promising as Effective Cancer Detection Test 2AMDL ELISA DR-70(R) (FDP) is Promising as Effective Cancer Detection Test 3Will New Technological Advances Offer Fresh Capabilities for Commercialization and Enhance BTL Investments? 2Will New Technological Advances Offer Fresh Capabilities for Commercialization and Enhance BTL Investments? 3U.S. News Media Group Releases 19th Edition of America's Best Hospitals 2U.S. News Media Group Releases 19th Edition of America's Best Hospitals 3
Raised to 5-HIAA coupled to BSA with paraformaldehyde....
Request Info...
NuCycl DAPI Kit Application: Flow Cytometry Reactivity: Human...
Anti-hamster Ig HRP detection kit...
Biology Products: