The Survival of Airborne Microorganisms III. Effects of Temperature

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Abstract
The death rates in air of one strain each of Escherichia coli, Achromobacter sp., Micrococcus sp., and Pseudomonas sp. (the last 3 being psychrophilic) were measured at 10[degree]C. Some additional results were obtained at 5[degree]C for the Micrococcus. Between 0[degree]C and 10[degree]C the temperature coefficients (Q10) of death rates range from 2 to 5 for cells of E. coli in the late log phase. With old cells of all spp., the death rate is unaffected by temperature at relative humidities of 90% and above. At lower humidities, old cells of the psychrophilic genera give values of Q10 up to 9. Young cells of the 3 psychrophilic genera die more rapidly than old cells at all humidities encountered. This behavior differs from that of E. coli in which an effect of age was observed only at high humidities.

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