X-Message-Number: 13958 Date: Fri, 16 Jun 2000 05:19:20 -0700 (PDT) From: Doug Skrecky <> Subject: a different type of life extension Title Freeze avoidance in a mammal: body temperatures below 0 degree C in an Arctic hibernator. Source Science. 244(4912):1593-5, 1989 Jun 30. Abstract Hibernating arctic ground squirrels, Spermophilus parryii, were able to adopt and spontaneously arouse from core body temperatures as low as -2.9 degrees C without freezing. Abdominal body temperatures of ground squirrels hibernating in outdoor burrows were recorded with temperature-sensitive radiotransmitter implants. Body temperatures and soil temperatures at hibernaculum depth reached average minima during February of -1.9 degrees and -6 degrees C, respectively. Laboratory-housed ground squirrels hibernating in ambient temperatures of -4.3 degrees C maintained above 0 degree C thoracic temperatures but decreased colonic temperatures to as low as -1.3 degrees C. Plasma sampled from animals with below 0 degree C body temperatures had normal solute concentrations and showed no evidence of containing antifreeze molecules. Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=13958