細菌胞子の耐熱性に関する研究(2)-胞子濃度と耐熱時間の関係に就て-

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(1) The authors have investigated the relations between spore concentration and the survival time at 100 and 95°C in phosphate buffer solution, using Bacillus natto-I and Bac. megatherium as test organisms. (The results are shown in Tables 1, 2, 3 and 4). (2) The relations between the logarithms of survival time and the logarithms of spore concentration were found to be linear (as shown in Fig. 2) as expressed in the following formula; log10N=a+blog10t where, N is the spore number per ml, t is the survival time in minutes, and a and b are constants specific to the strains, temperature, and the nature of suspending medium. (3) When the spores were suspended and heated in nutrient broth of pH 6.9, the relation also follows the above formula. (4) It has been shown clearly that the main cause of the increases of the survival time with the spore concentrations can not be attributed to the selectivity of the more resistant individuals, as hitherto been supposed. There must be some other fundamental causes of physico-chemical nature in the above relation.
社団法人日本農芸化学会の論文