電気殺菌法の研究-X

Abstract

In the present paper we have studied how does the death rate of bacterial spores be affected by the variation of concentration of each tested disinfectants when the spores of Bacillus mesentericus are heat sterilized in the presence of these disinfectants. In all tests with disinfectants, the steep germicidal effect appeared after some times which was entirely similar to our previous papers, and in a certain case the death rate before or after the refraction point of death rate curve was accerelated, or in other case the lag period was reduced in time. But the concentration effect was found to be varied with the kind of disinfectant. The correlation between the relative mortality time, TR at each concentrations when the mortality time of the control be taken 100, and the relative concentration, CR of disinfectants when the concentratration 4.17mg./100ml. be taken 10 is expressed by the JORDAN and JAOOBS equation(6). logTR=-nlogCR+logA, where, n and A being some constants. The value of n calculated from this equation is relatively, small in Furaskin and pentachlor phenol, i.e., the rate changed with the concentration is relatively small. On the contrary, the n value is larger in vitamin K3, and the promotion of germicidal effect with increasing concentration is more extreme.