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Cell Division of Escherichia coli BUG-6: Effect of Varying the Length of Growth at the Nonpermissive Temperature

^a Department of Microbiology, University of British Columbia, Vancouver 8, British Columbia, Canada

ABSTRACT

When Escherichia coli BUG-6 is grown at 42 C and then returned to 30 C, the division kinetics during the recovery at 30 C are dependent on the length of time the cells were grown at 42 C. If chloramphenicol is added when the cells are shifted from 42 to 30 C, no division occurs if the period at 42 C is less than 4 min or more than 110 min. Maximum division occurs when the period at 42 C is 50 min. A discussion of these results with reference to a previously proposed model is presented.

¹ Present address: Department of Microbiology and Medical Technology, University of Arizona, Tucson, Ariz. 85721

² Present address: Department of Genetics, University of Washington, Seattle, Wash. 98105.