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J Bacteriol. 1961 December; 82(6): 960-966
Copyright © 1961, The Williams & Wilkins Company. All Rights Reserved.

CHEMICAL COMPOSITION AND HEAT RESISTANCE OF SOME AEROBIC BACTERIAL SPORES¹

^a Department of Dairy and Food Industry, Iowa State University of Science and Technology, Ames, Iowa

ABSTRACT

WALKER, HOMER W. (Iowa State University of Science and Technology, Ames), JACK R. MATCHES, AND JOHN C. AYRES. Chemical composition and heat resistance of some aerobic bacterial spores. J. Bacteriol. 82:960–966. 1961.—Analyses of spores of Bacillus species for nitrogen, carbohydrate, dipicolinic acid, and phosphorus showed little correlation with heat resistance. However, as the molar concentration of magnesium increased in relation to dipicolinic acid and calcium concentrations, heat resistance generally decreased. Analyses of several batches of spores indicated that this relationship between calcium, magnesium, and dipicolinic acid did not always hold true. Therefore, while these materials apparently play an important role, other factors need to be included before a full explanation of thermal stability of spores can be made.

¹ Journal Paper no. J-4156 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project no. 1393, Center for Agricultural and Economic Adjustment cooperating. This investigation was supported in part by research grant RG6110 from the National Institutes of Health, U. S. Public Health Service.