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J Bacteriol. 1973 November; 116(2): 823-831
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Development of Ultraviolet Resistance in Sporulating Bacillus cereus T

^a Division of Food Research, Commonwealth Scientific and Industrial Research Organization, North Ryde, N.S.W., Australia 2113

ABSTRACT

Ultraviolet (UV) resistance patterns of sporulating Bacillus cereus were determined. Six different categories of UV resistance were discernible as the organism progressed from exponential growth to the free, mature spore. Light microscope observations allowed the assignment of certain sporulation stages to specific UV resistance categories. Marked changes in UV resistance were associated with stages III, mid-IV, and post-IV of sporulation. Dipicolinic acid was shown to sensitize forespores to UV radiation. Mechanisms invoked to explain the different UV categories are discussed.

¹ Present address: School of Dentistry, University of Minnesota, Minneapolis, Minn. 55455.

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