. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. MAM MALIAN MIRKRXATIOX 503 of about. (' and an oxygen consumption of ml/gm/hr. When ;i dosage of aboul ,000 r lias been reached, the rectal temperature and oxygen consumption begin to rise and reach values of 10-12°C and ml/gm/hr, respectively. At this time the bats are awake and active. Ground squirrels that are exposed to 1000 r during hibernation at 5°C remain dormant during irradiation but become fully awake and active about one hour later. The animals stay awake for several hours and enter hiberna
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. MAM MALIAN MIRKRXATIOX 503 of about. (' and an oxygen consumption of ml/gm/hr. When ;i dosage of aboul ,000 r lias been reached, the rectal temperature and oxygen consumption begin to rise and reach values of 10-12°C and ml/gm/hr, respectively. At this time the bats are awake and active. Ground squirrels that are exposed to 1000 r during hibernation at 5°C remain dormant during irradiation but become fully awake and active about one hour later. The animals stay awake for several hours and enter hibernation once again. IOO 90 -J 80 70 > or 60 Z> CO 50 1- 40 <i Ld o 30 (r us a. 20. 0 2 4 6 8 10 12 14 16 18 20 22 24 TIME (days postirrad iation ) Fig. 2. The influence of time in hibernation upon mortality of irradiated bats in a 5°C environment. • ©, collected and irradiated in January (4(i bats); O— — O, collected and irradiated in February (12 bats); X— —X, collected and irradiated in March (13 bats). Radiation dosage 30,000 r. The several experiments described above indicate that only those dosages of radiation that are high enough to elicit signs of altered function of the nervous system prevent the bat and the ground squirrel from entering hibernation. Animals exposed to such dosages show unusually great spontaneous activity, and appear unable to become quiet upon exposure to the cold. The ability to assume a quiescent state in a cold environment seems to be a primary requisite for entrance into Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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