Perturbation of the heat resistance of bacterial spores by sporulation temperature and ethanol |
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Authors: | Peter H Khoury Steve J Lombardi Dr Ralph A Slepecky |
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Institution: | (1) Department of Biology, Syracuse University Biological Research Laboratories, 13244 Syracuse, New York, USA |
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Abstract: | Spores ofBacillus megaterium, B. subtilis, andB. stearothermophilus, harvested from cultures grown and sporulated at different temperatures or in the presence of ethanol, had different thermal resistance. There was a direct relationship between the sporulation temperature and the spore-killing temperature. The spores were more temperature-sensitive when formed in ethanol-supplemented media. Temperature and ethanol are known to perturb the degree of order within membranes and to alter membrane functions. Thus, alteration of spore membranes is an additional factor in the multifactorial nature of heat resistance. Another interpretation may be that heat shock proteins, known to be induced by heat, are formed during sporulation and may increase the thermostability of the spores. |
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