Abstract
Heat energy, administered in the form of an elevated temperature heat soak over a specific interval of time, is a well-known method for inactivating organisms. Sterilization protocols, from commercial pasteurization to laboratory autoclaving, specify both temperature and time, as well as water activity, for treatments to achieve either acceptable reduction of bioburden or complete sterilization. In practical applications of planetary protection, whether to reduce spore load in forward or roundtrip contamination, or to exterminate putative organisms in returned samples from bodies suspected of possible life, avoidance of expensive or potentially damaging treatments of hardware (or samples) could be accomplished if reciprocal relationships between time duration and soak temperature could be established. Conservative rules can be developed from consideration of empirical test data, derived relationships, current standards and various theoretical or proven mechanisms for thermal damage to biological systems.
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