Abstract
Quantitative data on the effect of temperature on the growth rates of 3 psychrophilic Pseudomonas species and 2 mesophiles, Escherichia coli, Pseudomonas aeruginosa are presented. Psychrophiles have an 8 to 10[degree]C lower minimum growth temperature than mesophiles. They are further characterized by a markedly lower temperature coefficient for growth. Most current definitions of psychrophiles do not fit any known bacteria. It is suggested that psychrophiles should not be defined by maximum or optimum temperature but as bacteria that grow relatively rapidly at 0[degree]C.

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