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. 1969 Feb;97(2):780-6.
doi: 10.1128/jb.97.2.780-786.1969.

Covert fi- R factors in fi+ R+ strains of bacteria

E Romero, E Meynell

Covert fi- R factors in fi+ R+ strains of bacteria

E Romero et al. J Bacteriol. 1969 Feb.

Abstract

The presence of an fi(-) sex factor can be detected by propagation of the I-specific phage If1. By use of this method of detection, a high proportion of strains with fi(+) R factors were shown also to carry an fi(-) factor which was frequently a second R factor. In some doubly R(+) strains, the fi(+) and the fi(-) factor were observed to be transferred independently at conjugation.

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References

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