Accession Number:

AD0276017

Title:

OSMOTIC REGULATION IN THE TISSUES OF HIBERNATING MAMMALS

Descriptive Note:

Corporate Author:

ARCTIC AEROMEDICAL LAB FORT WAINWRIGHT ALASKA

Personal Author(s):

Report Date:

1961-10-01

Pagination or Media Count:

1.0

Abstract:

A new type of freezing point depression osmometer is described which utilizes stream-mixing as a mechanism of temperature control. When hydration of diaphragm sections incubated at 6 C was compared to that of diaphragm sections incubated at 37 C and to maximally hydrated diaghragm sections, it was found that hamster tissues swell less in vitro at low temperatures than do those of rats. Diaphragms of hibernating hamsters seemed to be more consistent than those of awake hamsters in this respect. Diaphragms of ground squirrels may also swell less than those of rats by this criterion. Loss of solids from incubated diaphragms is less at 6 C than at 37 C in vitro in all groups except awake ground squirrels. In awake hamster incubated diaphragms, solid loss is increased at 6 C by the presence of NaF. Diaphragms of hibernating hamsters and ground squirrels, however, resist this effect. Saturated fat in the diet of awake hamsters tends to abolish the resistance of their diaphragms to cold swelling. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE