Navigation Links
Fur and feathers keep animals warm by scattering light
Date:1/23/2014

initial calculations that showed heat loss between two bodies separated by air would be dominated by radiation, not conduction. To further explore the radiative heat loss the team created a simple computer model consisting of a hot and a cold thermostat that roughly simulated an animal's warm body and the outside, colder environment. The two thermostats were separated by an empty space into which were added "radiative shields" that could mimic individual hairs in a fur coat.

In one version of the model, the researchers incorporated so-called black-body shields, which absorb all of the radiation that strikes them. In a second version, opaque grey-body shields were used. "A grey body has some transmission and reflection as well," Simonis explains.

Simonis and her colleagues found that as the reflectivity of the radiative shields increased, the rate of heat transfer between the hot and cold thermostat was dramatically reduced. Adding more shields also dramatically reduced the energy loss. All together, the model suggests that the repeated backscattering of infrared light between radiative shields, like individual hairs and barbed feathers, could be the primary mechanism for the thermal insulation properties of fur and feathers.

The light scattering properties of animals' coats can also have dual purposes, Simonis notes. With the right structure, fur and feathers can generate efficient thermal insulation in the far infrared range while also scattering visible light to produce a white appearance in the visible wavelength range. "This is particularly useful to animals, such as mammals and birds, that live in snowy areas," Simonis says, as it provides them with both warmth and camouflage against the white snow.

For humans, focusing on ways to minimize radiative heat loss could lead to the development of new types of ultrathin insulation. "The idea is to multiply the interaction of electromagnetic waves with grey bodies reflecting bo
'/>"/>

Contact: Angela Stark
astark@osa.org
202-416-1443
The Optical Society
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Newly discovered dinosaur implies greater prevalence of feathers
2. Best evidence yet that dinosaurs used feathers for courtship
3. Study suggests why some animals live longer
4. NOAA discovers way to detect low-level exposure to seafood toxin in marine animals
5. Elephant seal tracking reveals hidden lives of deep-diving animals
6. Deep sea animals stowaway on submarines and reach new territory
7. Environmental concerns increasing infectious disease in amphibians, other animals
8. Ion selectivity in neuronal signaling channels evolved twice in animals
9. Super-strong, high-tech material found to be toxic to aquatic animals
10. Fossil study helps pinpoint extinction risks for ocean animals
11. Hunt for superbugs in Australian animals
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Fur and feathers keep animals warm by scattering light
(Date:9/19/2014)... regulate their symbiotic relationship with soil bacteria by ... plant structure from leaves into the roots to ... roots. This collaborative study was conducted by researchers ... Graduate University for Advanced Studies (SOKENDAI), and the ... , Legumes, an important plant family which ...
(Date:9/18/2014)... GSA Bulletin study uses tree rings to document ... Wash in northern New Mexico, USA. By determining burial ... investigators were able to precisely date arroyo sedimentary beds ... data with aerial imagery, LiDAR, longitudinal profiles, and repeat ... Arroyos are deep, oversized channels that have vertical or ...
(Date:9/18/2014)... Colo., USA Miranda, a small, icy moon of ... enigmatic bodies in the solar system. Despite its relatively ... of intense resurfacing that resulted in the formation of ... polygonal-shaped regions called coronae. , These coronae are ... at least 200 km across. Arden corona, the largest, ...
Breaking Biology News(10 mins):For legume plants, a new route from shoot to root 2Tree rings and arroyos 2Tree rings and arroyos 3Tree rings and arroyos 4Tree rings and arroyos 5Tree rings and arroyos 6Tree rings and arroyos 7Miranda: An icy moon deformed by tidal heating 2Miranda: An icy moon deformed by tidal heating 3Miranda: An icy moon deformed by tidal heating 4Miranda: An icy moon deformed by tidal heating 5Miranda: An icy moon deformed by tidal heating 6Miranda: An icy moon deformed by tidal heating 7
... LAFAYETTE, Ind. - Warmer, drier summers and extreme weather ... especially troublesome - possibly fatal - for walnut trees, ... years, Douglass Jacobs, a professor of forestry and natural ... Jacobs who is now a research scientist in the ...
... effects of climate warming on biodiversity pose a serious conservation ... Science .,Marine life may need to relocate faster than ... timing of major life cycle events. This challenges previous thinking ... than species on land because of slower warming in the ...
... of Cambridge study, which set out to investigate DNA methylation ... lifestyle and our health, has now mapped the link in ... collected greatly benefits a field that is still in its ... the researchers were, even 18 months ago. Researcher ...
Cached Biology News:Walnut trees may not be able to withstand climate change 2No plain sailing for marine life as climate warms 2No plain sailing for marine life as climate warms 3Environment and diet leave their prints on the heart 2
(Date:9/18/2014)... /PRNewswire-iReach/ -- DeepResearchReports.com adds "2014 Deep Research Report ... "2014 Deep Research Report on Global and China ... Photo - http://photos.prnewswire.com/prnh/20140918/147058 ... and China Acetic Acid Industry" is a professional ... and Global Acetic Acid Market. The ...
(Date:9/18/2014)... 18, 2014 On Tuesday, Secretary of ... Jim Risch for National Lab Day on the Hill. ... the national laboratory system. Durbin and Risch also formally ... increase awareness of the reach of the national labs ... to address some of our nation's most pressing challenges. ...
(Date:9/18/2014)... TX (PRWEB) September 18, 2014 ... a FM-4910 listed material, to stay competitive in ... These high-performance materials ultimately impact product quality ... President and owner. , Established in 1980 in ... strong as many fabricators have left the business. ...
(Date:9/18/2014)... 2014 Mapi, société créée à ... été depuis 40 ans l,un des pionniers ... par des évaluations recentrées sur le patient ... économiques des traitements. Logo - ... cours d,une récente conférence téléphonique avec l,ensemble ...
Breaking Biology Technology:Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 2Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 3Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 4Lab Day Highlight Labs' Contribution to U.S. Competitiveness and Innovation 2Lab Day Highlight Labs' Contribution to U.S. Competitiveness and Innovation 3Leatherwood Plastics Selects Vycom’s Flametec PVC-C Material to Stay Competitive in Semiconductor and Lab Equipment Industries 21974 - 2014 - Mapi fête ses 40 ans 2
... Business Today ... to Change to VRGE, PLANTATION, Fla., Sept. 4 Viragen,International, ... Bulletin Board: VRAI), today announced that a one for,forty (1:40) reverse ... at the close of business today, September 4, 2007. The ...
... American Oriental,Bioengineering, Inc. (NYSE: AOB ), a ... in China, today,announced that the Company will attend the ... 10, 2007 in Shenzhen, China as well as,the 3rd ... Murray,Carret & Co. on September 11, 2007 in Beijing, ...
... N.J., Sept. 4 Osteotech, Inc.,(Nasdaq: OSTE ... the repair,of the musculoskeletal system, announced today that ... present an overview,of the Company,s strategic direction and ... York Investor Conference. Mr. Owusu-Akyaw is,scheduled to present ...
Cached Biology Technology:Viragen International to Reverse Split Its Common Stock 2Viragen International to Reverse Split Its Common Stock 3American Oriental Bioengineering Announces Participation in September Investor Conferences 2
...
... Kits synthesize RNA probes with specific activities ... High specific activity, single-stranded RNA probes are ... hybridization, and blot hybridizations. MAXIscript Kits can ... modest amounts of unlabeled RNA (2-4 g/20ul ...
Can be used for the quantitative recovery of small amounts of nucleic acids within dilute solutions. 5mg/ml...
... liquid controls for monitoring Aldolase tests. ... abnormal) with targeted manufacturing values at ... ± 3 IU/L. 30-day shelf ... 2-8 C. Level 1: 3 x ...
Biology Products: