[Revertants of recA-strains of Escherichia coli K-12].

The paper presents the results of a study of revertants of strains AB2463 recA13, AB2465 rec15, No 41 rec16. It is shown that revertants are characterized as intermediate strains between recA and rec+ (on the level of recB, recC strains) on their recombination proficiency in crosses with Hfr, sensitivity to UV and gamma-rays and in F-heterogenote formed cultures on their capacity of the formation of recombinants between episome and chromosome and the capacity to chromosome mobilization. In the same time revertants do not differ from rec+ in the frequency of spontaneous and UV-induction of prophage constitution of recombinants formed in crosses, and in the synthesis of beta-galactosidase in postconjugation period. It is found that the mutations studied are mapped apparently in recA gene.