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Growth studies on the lactic streptococci: II. The effect of agitation on the growth characteristics of Streptococcus lactis ML8 in batch culture

Published online by Cambridge University Press:  01 June 2009

A. R. Keen
A. R. Keen
Affiliation:
New Zealand Dairy Research Institute, Palmerston North, New Zealand
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Summary

Investigations on the growth characteristics of Streptococcus lactis ML8 in skim-milk medium have indicated that agitation of the medium may decrease the growth rate of the organism by decreasing the availability of CO2 (CO2 effect) and of soluble nitrogen (soluble nitrogen effect). The former effect was observed only when the CO2 concentration was depleted by heat sterilization; the latter occurred when a certain threshold level of agitation was exceeded. Results suggested that the soluble nitrogen affect was caused by an alteration in the rate of diffusion of substances formed in the immediate vicinity of the bacterial cell by the proteolytic enzyme system.

Type
Research Article
Information
Journal of Dairy Research , Volume 39 , Issue 1 , February 1972 , pp. 141 - 150
Copyright
Copyright © Proprietors of Journal of Dairy Research 1972

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