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Multiplication of Bacteria and the Influence of Temperature and some other conditions thereon

Published online by Cambridge University Press:  15 May 2009

Janet E. Lane-Claypon
Janet E. Lane-Claypon
Affiliation:
Jenner Memorial Scholar, Lister Institute of Preventive Medicine
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The species of organisms used were B. coli, B. typhosus and B. enteritidis Gaertner. With these organisms:

(1) When a fresh broth culture is made with a small inoculation there is a period during which there is no increase in the number of bacteria present.

(2) When this period is over the bacteria commence to divide regularly; this is shown by the fact that the logarithms of the numbers plotted against time are found to fall on a straight line. This regular growth persists until (or nearly until) a maximum has been reached, after which the numbers remain more or less constant and then slowly decline.

The time necessary for a complete division to take place (generation time) was determined for various temperatures between 20°C. and 42°C.

(3) The effect of temperatures between 20° and 35.3°C. upon the rate of multiplication is in accordance with the Arrhenius-Van 't Hoff law; above this temperature the effect diminishes.

Type
Research Article
Information
Journal of Hygiene , Volume 9 , Issue 2 , September 1909 , pp. 239 - 248
Copyright
Copyright © Cambridge University Press 1909

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