Abstract
50% of rats, irradiated in a state of deep hypothermy (rectal temperature of 14[degree]-15[degree]C) with 800 and 900 r survived more than 30 days whereas all controls died within 17 days. The same degree of protection is obtained in the presence of O2 or under an air pressure of 1.25 atmosphere. The influence of hypothermy on the mortality of roentgen-irradiated mammals is probably re-lated to the general level of metabolic processes and not only due to anoxia.

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