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The effects of temperatures of 50 and 60 C on log-phase and stationary-phase cell suspensions ofStaphylococcus aureus are described. There is a leakage of free amino acids, protein, and 260 mμ-absorbing material from both types of cell suspension, and membrane damage, as measured by the intracellular penetration of 8-anilino-1-naphthalene-sulfonic acid, may be partially related to this leakage. Ribonucleic acid (RNA) degradation at any one temperature is virtually the same for both types of cell suspension, proceeding initially at a more rapid rate at 60 C than at 50 C. However, at the lower temperature, there is a secondary breakdown of RNA, which may be the result of enzyme action on a particularly labile RNA fraction. With stationary-phase cell suspensions heated in 1m sucrose, there is a more rapid degradation of RNA at 60 C than with cells in water. The results are discussed in relation to the biochemical effects of moist heat on the organism.

Thermally Induced Ribonucleic Acid Degradation and Leakage of Substances from the Metabolic Pool in Staphylococcus aureus