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:11/21/2014)... MOUNTAIN VIEW, Calif. , Nov. 20, 2014 /PRNewswire/ ... for higher driver efficiency are piloting the North American ... the number of accidents growing, gesture recognition systems that ... will make a mark in the industry. ... of the Automotive Gesture Recognition Market in ...
(Date:11/18/2014)... , Nov. 17, 2014 The Parenteral Drug ... U.S. regulatory agencies will speak and at least seven more ... Conference at the Omni Shoreham Hotel in Washington ... once again to have significant support from the regulatory agencies ... Europe in our effort to help advance ...
(Date:11/10/2014)... appearing on U.S. store shelves in early 2010, and ... The small packets can be tossed into a washing ... or powder. The convenience, though, has come with risks ... at Nationwide Children,s Hospital found that from 2012 through ... children younger than 6 years of age swallowing, inhaling, ...
Breaking Biology News(10 mins):Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 2Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 3Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 4FDA's Janet Woodcock, EMA's Emer Cooke Headline PDA Quality Metrics Conference 2Study finds laundry detergent pods, serious poisoning risk for children 2
... a study has compared water quality trends in forested streams ... or land cover changes. The study, which draws on ... states and Puerto Rico, underscores the value of long-term data ... in streams and rivers. It is published in the current ...
... sick with colon cancer, received a blood transfusion. Then, unexpectedly, ... on her case, the French medical journal Revue D,Hmatologie identified ... it turns out, Mrs. Vel had developed a potent antibody ... of most people in the worldbut not found on her ...
... Philanthropist, businessman and community leader John Moores has given ... fund the development of a new field test for ... tens of millions of people in Africa, Latin America ... John,s generosity and foresight," said Michael A. Marletta, president ...
Cached Biology News:Study explores long-term water quality trends in near-pristine streams 2Baffling blood problem explained 2Baffling blood problem explained 3John Moores gives $2 million to Scripps Research to develop river blindness field test 2
(Date:12/13/2014)... (PRWEB) December 12, 2014 Trend lines ... in overall global economic growth, Eugene Arthurs, CEO of ... , said in a featured talk at OPTIC (Optics ... at the National Chung Hsing University in Taichung. , ... integrated into future energy supplies and soon to hit ...
(Date:12/13/2014)... 2014 QuickSTAT is making significant investments ... Chain capabilities, and is delighted to announce the opening ... serve Life Science clients in the region. , QuickSTAT ... warehouse, will provide 24/7 transportation and logistics services, as ... patient-clinical specimens, API, following IATA rules and EU GDP ...
(Date:12/13/2014)... 12, 2014  Vaccinex Inc., a clinical-stage ... development of therapeutic monoclonal antibodies to treat ... of a manuscript entitled "SEMA4D compromises blood–brain ... neurodegenerative disease" in the January 2015 issue ... publication highlights an important role for antibodies ...
(Date:12/12/2014)... (PRWEB) December 11, 2014 Graphite Metallizing ... materials for pumps and process equipment, has appointed Kirk ... States and Ontario, Canada. Staller holds a B.S. degree ... in the industrial market place, much of it with ... out of his Michigan office. , “We are ...
Breaking Biology Technology:Photonics Continues Upward Trends Despite Challenges in the Global Economy, Notes SPIE CEO 2Photonics Continues Upward Trends Despite Challenges in the Global Economy, Notes SPIE CEO 3Photonics Continues Upward Trends Despite Challenges in the Global Economy, Notes SPIE CEO 4Photonics Continues Upward Trends Despite Challenges in the Global Economy, Notes SPIE CEO 5Quick Opens Office in France to Serve Life Science Community In France and Neighboring French-Speaking Countries 2Vaccinex announces publication of preclinical studies with an anti-SEMA4D antibody in animal models of neuroinflammatory and demyelinating disease 2Kirk Staller Joins Graphite Metallizing Corporation 2
... Total Site Solutions,(TSS), a Fortress International Group Company ... the planning, design and development of,mission-critical facilities today ... industry has awarded them the construction,management phase of ... performed technology consulting services to analyze,short term and ...
... Allos,Therapeutics, Inc. (Nasdaq: ALTH ), a biopharmaceutical ... molecule therapeutics for,the treatment of cancer, today announced ... a corporate overview at the 2007 UBS Global ... presentation will take place at 3:30 p.m. (Eastern) ...
... leader in,the rapidly evolving field of cancer molecular diagnostics, ... Lindenbergh as Chairman of its,Supervisory Board. Hessel Lindenbergh ... ING,Group N.V.. Currently, Mr. Lindenbergh is chairman of the ... the Royal Numico, Petroplus,International and Gamma Holding. Mr. Lindenbergh ...
Cached Biology Technology:Total Site Solutions Selected to Provide Construction Management Services for Existing Pharmaceutical and Biotech Customer for Data Center Expansion Project 2Total Site Solutions Selected to Provide Construction Management Services for Existing Pharmaceutical and Biotech Customer for Data Center Expansion Project 3Allos Therapeutics to Present at the 2007 UBS Global Life Sciences Conference 2Agendia BV Appoints Mr. Hessel Lindenbergh as Chairman of its Supervisory Board 2
... monoclonal antibody irreversibly crosslinked to protein G-agarose ... PDH complex from heart mitochondria. Also included ... for control immunocapture. ,The pyruvate dehydrogenase complex ... from small amounts of tissue. This facilitates ...
... innovative reagent for highly efficient transfer of ... cells. Unlike DNA transfection, with PULSin Protein ... timing of exogenous proteins in cells can ... be studied. Real time function blocking ...
... ST-195 allows real-time observations of cell cultures ... has 64 different strain parameters in addition ... thin silicon strain chamber used by the ... fluorescence microscopy. ST-195 can be used with ...
... demands on cell and tissue culture assumes ... Therefore, both cell concentration and percentage of ... precisely. The new Vi-CELLTM Cell Viability Analyzer ... to perform the trypan blue dye exclusion ...
Biology Products: