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

WASHINGTON, Jan. 23In work that has major implications for improving the performance of building insulation, scientists at the University of Namur in Belgium and the University of Hassan I in Morocco have calculated that hairs that reflect infrared light may contribute significant insulating power to the exceptionally warm winter coats of polar bears and other animals. The research was published today in The Optical Society's (OSA) open-access journal, Optics Express.

Biophotonics expert Priscilla Simonis, a researcher at the University of Namur and lead author of the Optics Express paper, was intrigued by the ability of polar bears to insulate their bodies to temperatures of 37 degrees Celsius (98.6 F) even during long, cold winters when outside temperatures are a frigid -40 C (-40 F). The feat was especially impressive given that the bears have a layer of fur that is only 5 centimeters thick.

The insulating power of the animals' coats made Simonis wonder why thermal insulation in buildings doesn't work as well. "Why do we need at least 60 cm of rockwool or glasswool" common types of building insulation made from minerals or glass fibers "to get a temperature of 20 degrees Celsius inside from about -5 degrees Celsius outside?" she asked. "Why is the polar bear fur much more efficient than what we can develop for our housing?"

Simonis and her team tackled the question by re-examining two of the different ways heat can travel: radiation, which transfers thermal energy through electromagnetic waves, and conduction, which transfers thermal energy through the vibrations of neighboring atoms and molecules. Most people assume that fur and feathers keep animals warm primarily by trapping a layer of air that slows thermal conduction, says Simonis. But she and her colleagues suspected that radiation might play a bigger role.

The scientists performed some
'/>"/>

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:10/31/2014)... been studying the behavior of approximately 300 wild ... They observed that ravens slowly build alliances through ... they also observed that these affiliative interactions were ... about 50 % of the cases these interventions ... ravens, intervening can be potentially risky when the ...
(Date:10/30/2014)... Restoring wetlands can help reduce or reverse soil ... research in California,s Sacramento-San Joaquin River Delta by ... study, which is one of the first to ... methane as they cycle through wetlands, appears in ... . , Worldwide, agricultural drainage of organic ...
(Date:10/30/2014)... life, cells immediately begin accepting assignments to become a ... humans, are special. The cells of mammalian embryos get ... the protective placenta or to commit to forming the ... research from Michigan State University has revealed key discoveries. ... PLOS Genetics , provide insights into where ...
Breaking Biology News(10 mins):Dartmouth study finds restoring wetlands can lessen soil sinkage, greenhouse gas emissions 2Identifying the source of stem cells 2
... (NYSE: A) today introduced a high-performance ion trap ... life-science researchers to identify 60 to 80 percent ... such as protein identification and biomarker discovery, potentially ... cancer and speeding drug development efforts. The Agilent ...
... frequency of drug resistance in isolates of the AIDS ... urgent necessity. Host genes required to support the replication ... targets, but relatively few appropriate target genes have been ... conducted by Dr. Suzanne Sandmeyer and colleagues at the ...
... D. Anderson Cancer Center have developed a way to test ... chemotherapy drug Taxol are effectively killing tumor cells. They say ... to accurately assess whether patients are responding to these agents, ... , In two different studies being presented at the ...
Cached Biology News:Product improves peptide identification for proteomics research 2Study reveals candidate targets for anti-retroviral therapeutics 2Measuring Enzymes At End Of Cancer Pathway Predicts Outcome Of Tarceva, Taxol 2Measuring Enzymes At End Of Cancer Pathway Predicts Outcome Of Tarceva, Taxol 3
(Date:10/30/2014)... Grace Century portfolio project, Provia Laboratories , ... the Board, to the National Stem Cell Ethics Committee ... by the Ministry of Health on behalf of the Government ... More than a year after Bahamian Parliament passed the ... Christie said the government has completed the accompanying regulations and ...
(Date:10/30/2014)... , Oct. 30, 2014  Regado Biosciences, Inc. (Nasdaq: ... hold a conference call and live audio webcast on ... discuss its third quarter 2014 financial results. ... by dialing (888) 347-1165 for domestic callers or (412) ... webcast live under the investor relations section of the ...
(Date:10/27/2014)... 27, 2014 Ryan Carfley , Managing ... to sit down with Bryan Hamilton, the publisher of the ... discuss talent in the Research Triangle region of North Carolina. ... highlighted at the roundtable include the role of social ... of work/life balance and the unique role that Millennials play ...
(Date:10/27/2014)... and TORONTO , ... ( www.generex.com ) (OTCQB: GNBT) today announced two ... response triggered by its novel proprietary cancer immunotherapeutic ... in breast cancer patients. The AE37 cancer vaccine ... Antigen Express, Inc. ( www.antigenexpress.com ). The presentations ...
Breaking Biology Technology:Grace Century’s Stem Cell Biobank Project Announces Chairman’s Appointment to National Stem Cell Ethics Committee of The Bahamas 2Grace Century’s Stem Cell Biobank Project Announces Chairman’s Appointment to National Stem Cell Ethics Committee of The Bahamas 3Regado Biosciences to Provide Third Quarter 2014 Financial Results 2Personify's Ryan Carfley Talks Recruiting with Triangle Business Journal, RPG Solutions 2Personify's Ryan Carfley Talks Recruiting with Triangle Business Journal, RPG Solutions 3Generex Announces Presentations Correlating Immunological Response with Reduced Recurrence in Phase II Study of AE37 Breast Cancer Vaccine in Patients at the American College of Surgeons 2Generex Announces Presentations Correlating Immunological Response with Reduced Recurrence in Phase II Study of AE37 Breast Cancer Vaccine in Patients at the American College of Surgeons 3Generex Announces Presentations Correlating Immunological Response with Reduced Recurrence in Phase II Study of AE37 Breast Cancer Vaccine in Patients at the American College of Surgeons 4
... the price of soybean seed skyrocketing, soybean growers are looking for ... seeding rate. The research and education director of the North Central ... and profit potential in 2009. , ... Urbandale, Iowa ...
... (ASX: CYT) has today circulated a letter and ... shareholders. The letter provides an update on the ... 2009 and provides recommendations on how to vote ... 2009.(Photo: http://www.newscom.com/cgi-bin/prnh/20090225/NY75105 )The letter and the sample ...
... SEATTLE, Feb. 24 Implicit,Bioscience Ltd today announced ... Eli Lilly and Company. Implicit has paid an,undisclosed ... will also,receive a royalty on future IC14 sales. ... substantial expertise and passion to the,treatment of patients ...
Cached Biology Technology:NCSRP Research Director: "Earlier Planting can Increase Soybean Yields" 2NCSRP Research Director: "Earlier Planting can Increase Soybean Yields" 3Cytopia Letter to Progen Shareholders 2Cytopia Letter to Progen Shareholders 3Cytopia Letter to Progen Shareholders 4Cytopia Letter to Progen Shareholders 5Implicit Licenses Clinical Stage Antibody Program From Lilly 2Implicit Licenses Clinical Stage Antibody Program From Lilly 3
BD BioCoat Fibronectin 35 mm Culture Dishes, tissue-culture treated polystyrene with a uniform application of human fibronectin....
... a positive selection for creating baculovirus recombinants ... insect cells. The kit improves on the ... eliminating the time-consuming steps of plaque purification. ... with a portion of the essential open ...
... General description: Dish uses include large-scale colony-counting ... with PBA Flexys TM automated colony ... is a new product number, created to ... no availability yet, please order under the ...
Mouse monoclonal [7B9] to beta II Tubulin ( Abpromise for all tested applications). Antigen: Synthetic peptide, CEEEEGEDEA found at the c-terminus of beta II tubulin. Entrez GeneID: 10383 ...
Biology Products: