THE INITIAL DEVIATION FROM LINEARITY OF THE THERMAL DEATH RATE CURVE OF A PUTREFACTIVE ANAEROBE

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Abstract
Thermal death rate detns. were made at 107[degree]C on a heat-activated suspension of spores of a putrefactive anaerobe (P.A. 3679). The survivor curve showed an initial lag in the death rate lasting for about 20 min. After this lag, the death rate was more rapid and regression analysis showed no significant deviation of detd. points from a logarithmic order. Portions of the same activated suspension were heated for 20 min. at 107[degree]C, the heating being interrupted by plunging the thermal death time tubes into ice water, and thermal death rate detns. made. The points on the survivor curve did not deviate significantly from a straight line. The results indicate that the observed initial lag in the thermal death rate of spore suspensions of P.A. 3679 is not an artifact of exptl. method but is attributable to thermal resistance characteristics of the spores.
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