The Effects of γ-Radiation and Heat on the Germination of Spores of Clostridium Botulinum Type E
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概要
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Spores of Clostridium botulinum type E were exposed either to various doses of γ-rays or to lethal and sublethal temperatures, then the effects on germination were studied by using the following two defined media: (A) L-alanine + glucose + bicarbonate and (B) L-alanine + lactate + bicarbonate. An increased inhibition of germination either by raising the temperature or by increasing the dose level was observed when medium A was used. On the other hand, activation by heat, but no activation by γ-radiation were observed when medium B was used. The heat activation was unaffected by additional pre- or post-irradiation. The amount of DPA released from spores by treatment with heat increased progressively with elevating temperatures, whereas no detectable amount of DPA was released by γ-irradiation at any of the sublethal doses applied. From the results that spores of Clostridium botulinum type E can be activated by heat but not by γ-radiation, could be explained on the basis of the difference in the manner of breaking dormancy between two agents.
- 日本放射線影響学会の論文