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Studies in the dynamics of disinfection IX. The effect of lethal temperatures on standard cultures of Bact. Coli. I. The nature of the probit-log survival-time relationship at pH 7·0

Published online by Cambridge University Press:  15 May 2009

R. C. Jordan ,
S. E. Jacobs  and
H. E. F. Davies
R. C. Jordan
Affiliation:
From the Physiology Department, University College of South Wales and Monmouthshire, Cardiff, and the Bacteriological Laboratory, Imperial College of Science and Technology, London
S. E. Jacobs
Affiliation:
From the Physiology Department, University College of South Wales and Monmouthshire, Cardiff, and the Bacteriological Laboratory, Imperial College of Science and Technology, London
H. E. F. Davies
Affiliation:
From the Physiology Department, University College of South Wales and Monmouthshire, Cardiff, and the Bacteriological Laboratory, Imperial College of Science and Technology, London
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1. A study has been made of the probit-log survival-time relationship in a number of experiments in which whole standard cultures of Bact. coli were subjected to heat at temperatures ranging from 47 to 55° C.

2. It is concluded that the whole mortality up to 99·99 % could not be covered by a single straightline relationship since the graphs are curves concave upwards and to the left.

3. Between 95 and 99·99 % mortality the relationship approximated closely to linearity.

4. Several individual experiments showed ‘humps’ in their curves. These, although always occurring at the same stage in time in the disinfections, varied in their probit levels.

5. By combining the data for all experiments, an idealized probit-log survival-time curve was obtained in which the changes of slope were less marked than in the curve representing the disinfection of similar cultures by phenol.

The authors wish to express their gratitude to Messrs I.C.I. (Pharmaceuticals) Ltd. for their valuable financial assistance, which has enabled one of us (H. E. F. D.) to devote his full time to this work.

Type
Research Article
Information
Journal of Hygiene , Volume 45 , Issue 2 , May 1947 , pp. 144 - 148
Copyright
Copyright © Cambridge University Press 1947

References

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