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Studies in the dynamics of disinfection: IV. The reaction between phenol and Bact. coli: the true shape of the probit‐log survival‐time curve
Author(s) -
R. C. Jordan,
S. E. Jacobs
Publication year - 1945
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1945.tb06239.x
Subject(s) - probit , probit model , biology , curvature , sigmoid function , line (geometry) , bilinear interpolation , statistics , biological system , mathematics , geometry , artificial neural network , computer science , machine learning
The results of numerous experiments on the disinfection of standard cultures of Bact. coli with phenol, under rigidly controlled conditions, have been combined and used to elucidate the true shape of the probit‐log survival‐time curve. It is concluded that the true shape is that of a very asymmetrical sigmoid curve. When the disinfection is slow, the curve approximates closely to a bilinear form with one line of small and one of large slope up to high probit values, but in faster disinfections the curvature of the steeper line is evident, especially above the probit value of 8.