Dry-heat resistance of bacterial spores recovered from mariner-Mars 1969 spacecraft
M D Wardle1, W A Brewer, M L Peterson
1Jet Propulsion Laboratory, Pasadena, California 91103.
Abstract:
The dry-heat resistances of 70 bacterial spore isolates recovered from Mariner-Mars 1969 spacecraft were determined and expressed as D values (decimal reduction times). Fifty per cent of the spore isolates had D values of 60 min or less at 125 C. Of organisms with D values greater than 60 min, four were selected for a study of the effect of sporulation medium and suspension menstruum on dry-heat resistance. Both sporulation medium and suspension menstruum were found to affect significantly the dry-heat resistance of the bacterial spores tested.
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