title: [Conjugative properties of the R factors found in 2 different strains of Escherichia coli].
abstract: The transfer frequency of R124-17, RI, RI-19 and RP4 factors as dependent on the origin of the donor strain was studied. The transfer frequencies of these factors from E. coli W strains are much lower than those from the strains of E. coli K12. The effect is connected neither with the repression of the tra-genes, nor with the restriction enzymes activity against the alien DNA in the recipient bacteria.
mesh_terms: D003090:Coliphages / Q000235:genetics; D003227:Conjugation, Genetic; D004926:Escherichia coli / Q000235:genetics*; D009154:Mutation; D010957:Plasmids; D011815:R Factors; D012641:Selection, Genetic
vernacular_title: Kon''iugativnye svoĭstva R-faktorov, nakhodiashchikhsia v dvukh razlichnykh shtammakh Escherichia coli.