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SOME EFFECTS OF CARBON SOURCE, AERATION, AND TEMPERATURE ON GROWTH OF A PSYCHROPHILIC STRAIN OF PSEUDOMONAS FLUORESCENS¹

^a Department of Dairy Industries, University of Minnesota, St. Paul and Minneapolis, Minnesota
^b Department of Microbiology, University of Minnesota, St. Paul and Minneapolis, Minnesota

ABSTRACT

OLSEN, RONALD H. (University of Minnesota, St. Paul) AND JAMES J. JEZESKI. Some effects of carbon source, aeration, and temperature on growth of a psychrophilic strain of Pseudomonas fluorescens. J. Bacteriol. 86:429–433. 1963.—A psychrophilic strain of Pseudomonas fluorescens was grown in stationary and aerated culture at 4, 10, 15, 20, 25, and 32 C. Generation times were determined for cultures growing in media containing glucose, monosodium citrate, or Casamino Acids as the primary carbon and energy source. The results indicated that growth on Casamino Acids with aeration contributed to significantly shorter generation times at low temperatures when compared with other media systems. Furthermore, temperature coefficients (Q₁₀ values) calculated from growth-velocity data showed that the effects of temperature on growth rate are influenced by the carbon source in the growth medium and by aeration.

² Present address: Department of Pathology and Microbiology, Colorado State University, Fort Collins.

¹ Paper no. 5071, Scientific Journal Series. Minnesota Agricultural Experiment Station. Taken from data presented to the graduate faculty of the University of Minnesota by the senior author in partial fulfillment of the requirements for the Ph.D. degree. Preliminary reports of this work have been presented at the 61st Annual Meeting of the Society of American Bacteriologists, Chicago, Ill., 23 to 27 April, 1961, and at the Low Temperature Microbiology Symposium sponsored by the Campbell Soup Co., Haddonfield, N.J., November, 1961.

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