Abstract
In large industrial scale bioreactors process cultures are frequently exposed to supperoptimal temperatures for short intervals of time. Data concerning the physiologica effects of such exposures are scant. Here, experiments involving short term heat shocks on two bacteria, Klebsiella pneumoniae, a non-fastidious mesophile growing on glucose and Bacillus sp. NCIB 12522, a fastidious thermotolerant methylotroph growing on methanol, are described. Markedly different response patterns for the two bacteria are evident, clearly indicating not only the dangers of making generalizations with respect to the effects of superoptimal temperatures on growing bacterial cultures but also, the significance of scale related segregation phenomena such as wall growth.
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