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:12/22/2014)... 2014  NXT-ID, Inc. (NASDAQ: NXTD and NXTDW) ... the growing mobile commerce market, announces it has retained famous ... the 2015 International CES debut of the Wocket™ biometric smart ... at the NXT-ID booth January 6th and 7 th , ...
(Date:12/22/2014)... 2014 Holiday Season may be the brightest ever for ... the long anticipated floodgates for consumer biometrics may finally ... phones, tablets, and wearable mobile devices that incorporate biometrics ... with nearly 4.8 billion biometric devices by 2020.   ...
(Date:12/19/2014)... Research and Markets ( http://www.researchandmarkets.com/research/86ncd6/micro_market ) has announced ... Perimeter Security Systems Market" report to their offering. ... American perimeter security market is estimated to grow at a ... market holds a larger share in this market, ...
Breaking Biology News(10 mins):NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 2NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 3NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 4First Season of Holiday Shopping with Mobile Biometric Payments Wraps Up With a Present for Biometrics Industry: A Rosy Forecast for More Than 2 Billion Users of 4.8 Billion Mobile Biometric Devices by 2020 2Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 2Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 3
... a detailed picture of how and when opsins evolved, ... including humans. The evolutionary origins of vision remain ... relationships among the earliest opsin-possessing animals. Dr Davide ... at NUI Maynooth performed a computational analysis to test ...
... scattering experiments have provided new insights into the origin ... all over the world. The analysis conducted by scientists ... Grenoble, and published in Scientific Reports , follows ... reduce these harmful complications. Wherever you are in ...
... in Toronto have established that a drug recently approved ... a rare form of cystic fibrosis works in an ... various forms of cystic fibrosis. Cystic fibrosis is ... world. Cystic fibrosis patients carry a defective gene that ...
Cached Biology News:Neutrons help explain why antibiotics prescribed for chemotherapy cause kidney failure 2Neutrons help explain why antibiotics prescribed for chemotherapy cause kidney failure 3Neutrons help explain why antibiotics prescribed for chemotherapy cause kidney failure 4Insights into a new therapy for a rare form of cystic fibrosis 2
(Date:1/22/2015)... , Jan. 22, 2015   Cypher Genomics, Inc., ... Inc. (NASDAQ: SQNM ), the leading ... for next generation noninvasive prenatal tests (NIPT). Through ... technology, called Mantis™, to advance analysis of clinically-relevant ...
(Date:1/22/2015)... , Jan. 22, 2015  Derma Sciences, Inc. ... company focused on advanced wound care, announces that ... tissues, have been added to the Premier, Inc. ... the opportunity for the AMNIOEXCEL® and AMNIOMATRIX® product ...
(Date:12/24/2014)... , Dec. 24, 2014 PlasmaTech Biopharmaceuticals, Inc. (NASDAQ: PTBI, ... announced the closing of an underwritten public offering of 3,500,000 ... an aggregate 3,500,000 shares of common stock, at an offering ... warrants have a per share exercise price of $5.00, are ...
(Date:12/24/2014)... 2014 “Preparative & Process Chromatography ... Consumables (Columns, Solvents, Buffers, Valves, Guages, Seals), Accessories, ... - Forecasts to 2019” provides a detailed overview ... market trends, and strategies impacting the preparative and ...
Breaking Biology Technology:Cypher Genomics and Sequenom Announce Development Agreement 2Cypher Genomics and Sequenom Announce Development Agreement 3Cypher Genomics and Sequenom Announce Development Agreement 4Derma Sciences Expands Access of its AMNIOTIC TISSUE Product Line with New Premier, Inc. Agreement 2Derma Sciences Expands Access of its AMNIOTIC TISSUE Product Line with New Premier, Inc. Agreement 3Derma Sciences Expands Access of its AMNIOTIC TISSUE Product Line with New Premier, Inc. Agreement 4Derma Sciences Expands Access of its AMNIOTIC TISSUE Product Line with New Premier, Inc. Agreement 5PlasmaTech Biopharmaceuticals, Inc. Announces Closing of Public Offering 2PlasmaTech Biopharmaceuticals, Inc. Announces Closing of Public Offering 3Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 2Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 3Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 4
... Wis. Wisconsin businesses and individuals are invited ... Products Awards Competition, which recognizes benefits coming from ... technologies. , ,Governor's New Products Awards are ... or more employees); large companies (500-999 employees); medium ...
... latest business venture of Mike Strand in Eau Claire ... competition, has landed $250,000 from the Chippewa Valley ... has a plan to put video screens showing advertising ... the statewide business-plan competition finals, it won the emerging ...
... Wis. — Sonic Foundry posted mixed financial numbers for ... while still posting a net loss. , ,Revenues were $8.3 ... with unit sales up 74 percent, owing to multiple unit ... , ,Operating expenses increased by 20 percent, however, and the ...
Cached Biology Technology:
... weight determinations for petroleum-based applications. Multiple solvents can be used, such as water, benzene, formamide, ... ... ... ...
rat Leptin...
SHEEP ANTI ESCHERICHIA COLI...
... culture chambered coverslips are convenient ... staining and imaging. The chambered ... with standard optical-quality coverslips and ... to use. Preassembled CultureWell systems ...
Biology Products: