Neurospora conidia irradiated by Co/sup 60/ gamma -rays in aqueous suspension under aerobic conditions exhibit survival curves that indicate the occurrence of two different inactivation processes. The more effective process is an indirect process that requires the presence of water and oxygen and results in nuclear inactivation. The second process is a direct-hit process that cannot be definitely associated with any particular cellular component. Only this second process is effective in killing spores irradiated in the lyophilized state.
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Robert D. Gafford (1958) studied this question.
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