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

gar was not present and sugar and other cryoprotectants are thought to "hold" water inside the cell."

The curious thing Larson discovered is that when wood frogs are outside in their natural environment they accumulate much higher concentrations of glucose in their tissues than do frogs frozen in the lab.

Glucose concentrations in the outside frogs were 13-fold higher in muscle tissue, 10-fold higher in heart tissue and 3.3-fold higher in liver tissue compared to lab-frozen frogs, as described in their paper published in the Journal of Experimental Biology.

This extra protection enabled frogs to survive colder temperatures for a longer time than scientists previously thought, but Larson and Barnes wondered how they accumulated so much glucose?

Larson thinks the process that creates freezer burn on a frozen steak gives frogs the ability to survive being frozen at minimum temperatures below zero (minus 18 Celsius) for up to 218 days with 100 percent survival.

Frogs collected from sites in the Eastern U.S. and Canada have previously been shown to only survive being frozen for a few weeks and to no lower than about 19 degrees (minus 7.2 Celsius).

"In the field in early Autumn it's freezing during the night, thawing slightly during the day, and these repeated freezing episodes stimulate the frogs to release more and more glucose," Larson said. "It's not warm enough for long enough for the frog to reclaim much of that glucose and over time it accumulates giving the frog more protection against cell damage."

Lab-frozen frogs are held at a constant temperature and without the freeze-thaw cycles Larson observed in the wild and so the frogs made glucose only when they initially froze and that was that.

"Whether the extremes in freezing tolerance in Alaska frogs as compared to more southern populations are due to patterns of temperature change during freezing or are due to genetic differences
'/>"/>

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:4/14/2015)...  HYPR Corp. today announced it has joined ... tm , an industry consortium transforming online authentication ... technology and collaborate to deliver open specifications for ... and private, and easier to use. ... sensitive user information and eliminates the dependency on ...
(Date:4/13/2015)... 2015  higi, a leading cloud-based consumer engagement platform ... engage with their communities around health and wellness, announced ... secure API.  ... affordable, and convenient vehicle to receive validated health information ... The API will allow higi,s trusted partners, on ...
(Date:4/8/2015)... , April 8, 2015  Infinisource, a ... and services, and Morpho, a leading supplier of ... to produce the market,s most advanced biometrically-enabled time ... iSolved NXG time clock is setting a bold, ... labor data for the small and mid-size employer. ...
Breaking Biology News(10 mins):HYPR Corp. Joins the FIDO Alliance 2HYPR Corp. Joins the FIDO Alliance 3higi Launches Seamless Access to HIPAA-Compliant Health Outcomes and Activity Data 2higi Launches Seamless Access to HIPAA-Compliant Health Outcomes and Activity Data 3iSolved Time Clock Offers Unmatched Accuracy due to Morpho Biometrics 2iSolved Time Clock Offers Unmatched Accuracy due to Morpho Biometrics 3
... percent of the major global cereal crops rice, ... possible yields in farmers, fields, according to University of ... . These findings raise concerns about efforts to increase ... these crops have recently decreased or plateaued. Future projections ...
... shrub that grows on just a single island in the ... and genus. It is also one of the oldest flowering ... ago. Now, researchers from Indiana University, with the U.S. Department ... and the Institute of Research for Development in New Caledonia, ...
... constant reconfiguration of the connections between nerve cells. Two ... mechanisms that underlie the learning process. Learning and ... nerve connections in the brain. Both processes are based ... cells the so-called synapses which alter their ...
Cached Biology News:UNL research raises concerns about global crop projections 2A gluttonous plant reveals how its cellular power plant devours foreign DNA 2A gluttonous plant reveals how its cellular power plant devours foreign DNA 3Neurobiology: The logistics of learning 2Neurobiology: The logistics of learning 3
(Date:5/28/2015)... 28, 2015 The Fertility Centers of ... Dr. Danielle Vitiello has taken on a new and ... Vitiello will provide guidance, leadership, oversight and quality assurance ... Dr. Vitiello among our team of experienced reproductive endocrinologists,” ... Joseph A. Hill, M.D. “Her expertise and compassionate, individualized ...
(Date:5/28/2015)... 28, 2015 Global futurist and ... to ask his audiences if they are ready ... robotics, solar cells, fuel cells, rapid health care ... battery storage technology, driverless cars, artificial intelligence masquerading ... inexpensive online education. , While the majority ...
(Date:5/28/2015)... 28, 2015 In two different ... Sherley, M.D., Ph.D., will present the company’s unique approach ... a conference talk, he will describe Asymmetrex ’s ... with computer simulation to produce the first-ever technology for ... quality over time in culture. When leading an ...
(Date:5/27/2015)... , May 27, 2015 RXi ... company focused on discovering and developing innovative therapies ... today announced that it has commenced a public offering ... purchase shares of its common stock and overallotment ... stock. The shares of common stock, warrants and ...
Breaking Biology Technology:Danielle Vitiello, MD of Fertility Centers of New England, Named New Medical Director 2Futurist Jack Uldrich to Deliver 4 Keynote Addresses in June 2Asymmetrex Will Discuss the Importance of Adult Tissue Stem Cell Time with 3D Tissue Engineers at the 14th Annual World Preclinical Congress in Boston in June 2Asymmetrex Will Discuss the Importance of Adult Tissue Stem Cell Time with 3D Tissue Engineers at the 14th Annual World Preclinical Congress in Boston in June 3RXi Pharmaceuticals Announces Proposed Public Offering of Common Stock and Warrants 2RXi Pharmaceuticals Announces Proposed Public Offering of Common Stock and Warrants 3
... 7 The winners of the Ferring Research,Infertility ... the,European Society for Human Reproduction & Embryology Congress. ... University Medical Centre Utrecht, The,Netherlands and the Universitair ... winning research institutions were selected for their outstanding,proposals ...
... 7 Neurobiological,Technologies, Inc. (NTI(R)) (Nasdaq: NTII ), ... officer (CEO), has announced his,intent to retire on December ... serve on the Board. Mr. Freiman is the former ... Mr. Freiman is retiring after 11 years of ...
... New Leaf Venture Partners Commit To Purchase ... $200 to $300 Million ... Angiotech Debt, VANCOUVER, July 7 /PRNewswire-FirstCall/ - Angiotech ... specialty pharmaceutical and,medical device company, today announced that Angiotech,s ...
Cached Biology Technology:Ferring Research Infertility and Gynaecology GrAnt (FRIGGA) 2008 Winners Announced 2Ferring Research Infertility and Gynaecology GrAnt (FRIGGA) 2008 Winners Announced 3Neurobiological Technologies' CEO to Retire on December 31, 2008 2Angiotech to Establish Separate Operating and Royalty Businesses 2Angiotech to Establish Separate Operating and Royalty Businesses 3Angiotech to Establish Separate Operating and Royalty Businesses 4Angiotech to Establish Separate Operating and Royalty Businesses 5Angiotech to Establish Separate Operating and Royalty Businesses 6Angiotech to Establish Separate Operating and Royalty Businesses 7Angiotech to Establish Separate Operating and Royalty Businesses 8Angiotech to Establish Separate Operating and Royalty Businesses 9Angiotech to Establish Separate Operating and Royalty Businesses 10Angiotech to Establish Separate Operating and Royalty Businesses 11Angiotech to Establish Separate Operating and Royalty Businesses 12Angiotech to Establish Separate Operating and Royalty Businesses 13Angiotech to Establish Separate Operating and Royalty Businesses 14
... powerful application for DNA and protein ... Expression makes complex computational analyses of ... the very latest computing technology to ... sequences are analysed. Features include: Sequence ...
... Cytokeratin TYPE II Reacts with most ... epidermal cell keratin of 86 and 58kD ... Broad keratin reactivity is found on human ... Immunogen: Human epidermal cells ...
... Colorimetric Detection System is intended for use ... generated by an in-house validated in vitro ... of interest. • ... a hybridization capture assay designed to detect ...
Mouse Anti-Human Killer cell immunoglobulin-like receptor, two domains, long cytoplasmic tail, 4 (KIR2DL4 Monoclonal Antibody Family: New...
Biology Products: