[The deamination of L-arginine and the synthesis of active nitrogen compounds in Yersinia pestis].

Y. pestis were found to be capable of highly effective deamination of L-arginine with the formation of citrulline and the synthesis of active nitrogen compounds. The formation of citrulline by the cells of initial strains and arginine-dependent derivatives with the blocking of the synthesis of arginine on the level of ArgG, ArgF and ArgE was shown.

[The sensitivity of bacterial strains of Yersinia pestis isolated from voles to normal human serum].

The work deals with the results of the study of the viability of Y. pestis strains, isolated from voles in different natural foci of plague, in human normal serum (HNS) and its dependence on the assimilation of ions of exogenic iron. The cultures isolated at the Transcaucasian mountain focus of infection and having no small plasmid pYP were found highly sensitive to HNS.

[The lytic activity of Yersinia pestis phage P 3d serovar].

The lytic activity of plague phage II, serovar 3, with respect to 1,800 bacterial strains has been studied: 760 Yersinia pestis strains, 262 Y. pseudotuberculosis strains, 252 Y. enterocolitica strains, 166 Escherichia coli strains, 90 Shigella strains and 270 strains of other species.