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Appl. Environ. Microbiol., Oct 1996, 3897-3900, Vol 62, No. 10
Copyright © 1996, American Society for Microbiology

Comparison of Pressure Resistances of Spores of Six Bacillus Strains with Their Heat Resistances

A Nakayama, Y Yano, S Kobayashi, M Ishikawa and K Sakai
National Research Institute of Fisheries Science, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236, Chiba Prefectural Fisheries Experiment Station, Awagun, Chiba 295, and Yaizu Suisankagaku Industry Co., Ltd., Kogawashinmachi, Yaizu, Shizuoka 425, Japan

The pressure resistances of the spores of six Bacillus strains were examined at 5 to 10(deg)C and were compared with their heat resistances. The pressure treatments (at 981 MPa for 40 min and at 588 MPa for 120 min) did not inactivate the spores of B. stearothermophilus IAM12043, B. subtilis IAM12118, and B. licheniformis IAM13417. However, these spores had large differences in heat resistance. The spores of B. megaterium IAM1166 were 9.3 times more pressure resistant but 246 times less heat resistant than those of B. stearothermophilus IAM11001. The spores of B. coagulans IAM1194 were activated by the pressure treatments. There was no correlation between these pressure and heat resistances.


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