Abstract
Physiological effects of NaCl concentration (equivalent water activities, aw, 1 to 0.87) were investigated with the moderately halophilic and piezotolerant bacterium, Kocuria rosea (formerly Micrococcus roseus), grown in bacteriological peptone/yeast extract broth. This bacterium, which was isolated from open shallow seawater, can grow in 150 g NaCl l−1 (optimum NaCl concentration: 30 g l−1, aw=0.984) and under 207 MPa of hydrostatic pressure. The effects of water activity on μm can be quantitatively predicted, to a high level of accuracy by application of the Aiba/Edwards, and the Levenspiel-type unstructured inhibition-type kinetic models.
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