Plasmid profile, colicinogeny and phage sensitivity as indicators of the dynamics of Escherichia coli populations in the human gut.

A possibility to use such bacterial phenotypes as plasmid profiles, colicinogeny and phage sensitivity as dynamics indicators of enterobacterial population in the human intestine was considered in the present work. All these three phenotypes, considered together with the type of enterobacterial association and age of the patients may reflect the dynamic state of the individual E. coli population that is currently prevailing in the intestinal microflora.

[Plasmid spectra and phagotypes of Escherichia coli strains isolated from patients with large intestine tumours].

The work deals with connection between plasmid spectra and phagotypes of Escherichia coli strains isolated from patients with tumours in large intestine. It has been established that 70 % of this bacterium isolates from the normal tissue, intestine lumen and tumours are characterized by multiple content of plasmids. Sometimes large endogenic plasmids are accompanied by the closed ring DNA with discrete sizes: 3.