MOISTURE REQUIREMENTS OF BACTERIA IV

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Abstract
The effect of water activity (aw) on the lag phase and generation time of Pseudomonas fluorescens, Aerobacter aerogenes, and Lactobacillus viridescens was studied in atmospheres of different partial pressures of carbon dioxide at different temperatures. Both P. fluorescens and A. aerogenes grew in less available water at increased partial pressures of carbon dioxide than in air. L. viridescens grew at lower levels of aw in air than in carbon dioxide. The effects of increased partial pressures of carbon dioxide on the lag phase and generation time of the 3 organisms varied with the level of carbon dioxide, the temperature, the aw, and the organism.