SUMMARY Spores of two suspensions of Bacillus stearothermophilus strain M were heat‐shocked in monosaccharides, disaccharides, and polysaccharides. The concentration had significant effects. The dominant significant trend was for reduced counts with increased concentrations of carbohydrate. These significant effects are thought to he associated with osmotic pressure. It would appear, therefore, that there was considerable difference in the osmosensitivity of spores in these populations. Spores were activated as well as suppressed when heated in plant extracts. Pea, spinach, and corn extracts tended to suppress spore germination, and green bean extract stimulated spore germination.
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Fields et al. (1964) studied this question.
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