Production of Psychrophilic Mutants from Mesophilic Bacteria by Ultraviolet Irradiation

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Abstract
Psychrophilic mutants were obtained by the ultraviolet irradiation of three mesophilic strains of Pseudomonas aeruginosa. None of the parent cultures produced visible growth on trypticase soy agar in ten days at 10[degree]C. All of the psychrophilic mutants produced visible colonies; in two days at 6[degree]C and in eight days at 0[degree]C. Apart from the ability to grow at low temperature, the psychrophilic mutants were indistinguishable from their respective mesophilic parental cultures.