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J Virol. 1968 April; 2(4): 357-364
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Characteristics of Bacteriophages Attacking Psychrophilic and Mesophilic Pseudomonads 1

R. H. Olsen, Eleanor S. Metcalf and James K. Todd2

Department of Microbiology, The University of Michigan, Ann Arbor, Michigan 48104

ABSTRACT

Ten Pseudomonas phage were isolated by sewage enrichment. Five psychrophilic and five mesophilic phage were selected for a description of some of their biological properties. In addition to growth on psychrophilic hosts, the psychrophilic phage studied were also able to grow on a mesophilic host within its growth temperature range. Latent periods for psychrophilic phage at 3.5 C were 6 to 12 hr and at 25 C were 30 to 60 min. Mesophilic phage had a latent period of 85 to 190 min at 25 C and 35 to 85 min at 37 C. Psychrophilic phage were significantly more heat-sensitive than the mesophilic phage. Of all the parameters studied, only thermal sensitivity correlated with growth at 3.5 C. Phage used in this study had a deoxyribonucleic acid base composition ranging from 39.6 to 68.2% guanine plus cytosine, deduced from melting temperature measurements.

FOOTNOTES

2 Recipient of a summer medical student research fellowship from the College of Medicine, The University of Michigan, Ann Arbor.

1 Parts of this study were conducted by Eleanor Metcalf in partial fulfillment of the requirements for the M.S. degree in the Department of Microbiology, The University of Michigan, Ann Arbor.

J Virol. 1968 April; 2(4): 357-364
Copyright © 1968 American Society for Microbiology. All Rights Reserved.



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