Abstract
The existence of the super fast repairing system for single-strand breaks in DNA, induced in cells exposed to gamma-irradiation at 0°C in a phosphate buffer under aerobic conditions, has been shown in three strains of Escherichia coli K-12 (AB 1157 rec+, AB 2463 rec A13 and JC 4457 rec B). Super fast repairing system rejoins up to 90–95 % of initial single-strand breaks during irradiation. An estimation of the lower limit of the rate of repairing the breaks by this system has been made.
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