The effect of temperature on the growth and substrate oxidation activity in
Pseudomonas fragi (as a psychrophile) and
P. aeruginosa (as a mesophile) was investigated. The results obtained are summarized as follows.
1. Both organisms showed essentially the same temperature-characteristic patterns of growth rate, except that the temperature-optima for growth of
P. fragi and
P. aeruginosa were 25 and 35C, respectively.
2. Both organisms resembled each other with regard to the temperature-characteristic patterns of malate or succinate oxidation and those of several dehyrogenase activities within a range from 5 to 35C.
3. In a higher temperature range, for instance, at 45 C,
P. aeruginosa oxidized pyruvate, ethanol, acetate, and malate more effectively than
P. fragi did, and
vice versa in a lower tempetaure range, except for malate oxidation.
44. The temperature-characteristic patterns of malate oxidation activity in intact cells were similar to those in dried cells of each
Pseudomonas species.
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