Influence of Temperature History on the Response of Psychrophiles to Different Incubation Temperatures

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Abstract
The growth of Pseudomonas fluorescens in nutrient broth was studied turbidimetrically at 37[degree], 20[degree] and 5[degree]C, and it was found that the incubation temperature of the mother culture had a marked effect on the response of subcultures to subsequent incubation temperatures. Faster growth at 20[degree]C occurred when transfers were made from colder temperatures than from warmer ones. Incubation in the cold favored subsequent growth in the cold, whereas incubation at 37[degree]C favored growth at 37[degree]C. Sequence of incubation temperatures also influenced the bacterial count of pasteurized milk, which showed higher counts when initially stored at 2V followed by 8[degree]C, than it did when stored for the same periods at 8[degree]C followed by 2[degree]C.

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