Navigation Links
Alaska frogs reach record lows in extreme temperature survival
Date:7/22/2014

Freezing and thawing might not be good for the average steak, but it seems to help wood frogs each fall as they prepare to survive Alaska's winter cold.

"Alaska wood frogs spend more time freezing and thawing outside than a steak does in your freezer and the frog comes back to life in the spring in better shape than the steak," said Don Larson, University of Alaska Fairbanks graduate student and lead author on a recent paper demonstrating that freeze tolerance in Alaska wood frogs is more extreme than previously thought.

Although wood frogs are well-studied freeze-tolerant amphibians, Larson's research is believed to be the first to examine the frogs under natural conditions.

In subarctic Interior Alaska, wood frogs overwinter in the ground covered by duff and leaf litter, creating a hibernacula, where temperatures can remain below freezing for more than six months with minimum temperatures of minus four (minus 20 Celsius).

Tracking wood frogs to their natural hibernacula, and using a fenced hibernacula in the Biological Reserve north of the UAF campus, Larson and co-author Brian Barnes, director of the UAF Institute of Arctic Biology and an expert in cold-climate physiology, wanted to know how cold and how long Alaska's wood frogs could survive in their natural habitat.

"Imagine what happens when you suck on a freeze pop," said Larson. "After you've sucked out all the sweet stuff, you're left with just ice. That's what happens to cells when they freeze. As ice formation pulls the water out of cells, the cells desiccate or dry out and eventually die."

Frogs prevent this freeze-pop effect by packing their cells with glucose (a kind of sugar) that reduces drying and stabilizes cells, a process scientists call cryoprotection.

"Concentrating sugar inside the cell helps balance the concentration of salts outside the cell that occurs as ice forms," said Barnes. "Less water leaves the cell than if su
'/>"/>

Contact: Marie Thoms
methoms@alaska.edu
907-474-7412
University of Alaska Fairbanks
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. New technology tracks sparrow migration for first time from California to Alaska
2. Funny River Fire, Alaska
3. Update on Funny River Fire, southern Alaska
4. Alaska neuroscientist receives national mentor award
5. Athletic frogs have faster-changing genomes
6. Richer parasite diversity leads to healthier frogs, says University of Colorado study
7. Preserved frogs hold clues to deadly pathogen
8. Genetic matchmaking saves endangered frogs
9. What do American bullfrogs eat when theyre away from home? Practically everything!
10. New scientific studies reveal Midwestern frogs decline, mammal populations altered by invasive plant
11. Croaking chorus of Cuban frogs make noisy new neighbors
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Alaska frogs reach record lows in extreme temperature survival
(Date:11/11/2014)... 2014  Forensicon, Inc., a Chicago ... announce the promotion of Yaniv Schiff from ... In Schiff,s new role as Director, he will lead ... forensics examiners and provide leadership within the company,s digital ... http://photos.prnewswire.com/prnh/20141110/157719 Schiff joined Forensicon in ...
(Date:11/6/2014)... groundbreaking paper from a team of Florida State University ... plants could adapt to and survive environmental swings such ... the latest issue of the journal The Plant ... of DNA and proteins) is organized in a cell ... genes are turned on and others are turned off. ...
(Date:11/5/2014)... has dedicated his career to understanding the Earth,s ... audience. , As deputy director and regional climatologist ... Desert Research Institute, Redmond has more than three ... dissemination of climate data to the general public. ... San Francisco on December 15-19, 2014 the American ...
Breaking Biology News(10 mins):Yaniv Schiff Promoted to Director of Digital Forensics at Forensicon, Inc. 2Maize analysis yields whole new world of genetic science 2Nevada climatologist to be honored at AGU Fall Meeting for lifetime of public outreach 2
... tracts (guts) of healthy American children have numerous antibiotic ... by scientists at Washington University School of Medicine in ... they can be shared with harmful microbes, interfering with ... to serious illness and, in some cases, death. ...
... researchers report that the deletion of any single gene in ... leading to a mutation in another gene. Their discovery, which ... DNA is conserved across species, could have significant consequences for ... areas of research, they say. Summarized in a report ...
... of Oceanography at UC San Diego and their colleagues ... that produces a dazzling bioluminescent display in the form ... Found around the world in muddy environments, from shallow ... Chaetopterus marine wormcommonly known as the "parchment ...
Cached Biology News:Gut microbes in healthy kids carry antibiotic resistance genes 2Gut microbes in healthy kids carry antibiotic resistance genes 3Deletion of any single gene provokes mutations elsewhere in the genome 2Deletion of any single gene provokes mutations elsewhere in the genome 3Nature's glowing slime: Scientists peek into hidden sea worm's light 2Nature's glowing slime: Scientists peek into hidden sea worm's light 3
(Date:11/21/2014)... 21, 2014 2014 Deep Research ... is a professional and in-depth research report on ... information, like its definition, classification, application, and ... This report covers the international market analysis, including ... as the US, Europe, Asia, China, Japan etc. ...
(Date:11/21/2014)... VANCOUVER , Nov. 20, 2014 /CNW/ - ... pleased to announce that it has closed a ... special warrants for approximately C$3.7 million.  Cormark Securities ... agents in the Brokered Offering for a syndicate ... and PI Financial Corp. (collectively the "Agents"). Concurrently ...
(Date:11/18/2014)... SAN BRUNO, Calif. , Nov. 18, 2014 ... is a platinum sponsor of the 10th Annual World Stem ... and regenerative medicine stakeholders. The 2014 World Stem Cell Summit ... San Antonio, Texas . ... the discovery and development of lifesaving cures and therapies, convening ...
(Date:11/18/2014)... (PRWEB) November 17, 2014 pH measurement ... processes across the pharmaceutical, chemical, and food and beverage ... so important, and how do pH sensors work? METTLER ... assist those in process industries with these questions and ... pH measurement in the process industries. The actual sensor, ...
Breaking Biology Technology:Sodium Ferrocyanide Market: Analysis for Global & China Regions Development Trends Available at DeepResearchReports.com 2Sodium Ferrocyanide Market: Analysis for Global & China Regions Development Trends Available at DeepResearchReports.com 3Aequus Pharmaceuticals closes $4.2 million private placement financing 2Aequus Pharmaceuticals closes $4.2 million private placement financing 3Cord Blood Registry Sponsors 2014 World Stem Cell Summit 2Cord Blood Registry Sponsors 2014 World Stem Cell Summit 3pH Guide from METTLER TOLEDO Explains Measurement, Theory and Practice of pH Applications 2
... End of 2008, NOVATO, Calif., Sept. 25 ... today that its partner Merck,Serono, a division of ... for Kuvan(R) (sapropterin dihydrochloride) as an oral,treatment for ... (BH4) deficiency from the Committee for,Medicinal Products for ...
... 25 Bion Environmental Technologies,Inc. (OTC Bulletin Board: BNET) ... entitled, "Low Oxygen Organic Waste,Bioconversion System" has been granted ... Standard Patent number of 2002227224. The,official filing date is ... be,in force until an expiration date of November 8, ...
... ... in FUNCTIONAL FOOD market-- LAVAL, QC, Sept. ... TSX.V.NTB) reported today,that it entered a worldwide alliance with Marine ... Nutrition for the distribution,of dietary supplements and functional food products ...
Cached Biology Technology:Kuvan Receives Positive Opinion From CHMP for European Approval 2Kuvan Receives Positive Opinion From CHMP for European Approval 3Kuvan Receives Positive Opinion From CHMP for European Approval 4Bion Announces Approval of New Australian Patent for Low Oxygen Organic Waste Bioconversion for Livestock Waste Environmental Treatment 2Neptune Technologies and Marine Life Sciences enter worldwide distribution alliance with Weider Global Nutrition 2Neptune Technologies and Marine Life Sciences enter worldwide distribution alliance with Weider Global Nutrition 3Neptune Technologies and Marine Life Sciences enter worldwide distribution alliance with Weider Global Nutrition 4
Mouse Cell Line Slides...
Request Info...
Human Cell Line Slides...
... Level 2 Detection System combines the ... bonding principle and Signets unique formulation ... specificity and reliablility. Signet reagents will ... manual and automated protocols. ,Signets USA ...
Biology Products: