[Phage-stable mutants of Pseudomonas putida: new types of stability].

More than 170 phage-resistant mutants (PRM) of the first order of Pseudomonas putida strain PpG1 were obtained using newly isolated and previously described bacteriophages specific for this strain. According to the results of analysis of resistance of the mutants to each of 31 phages of PpG1 strain and 8 phages of the PpN strain, the PRM strains were distributed into 20 groups. In most cases, the reason for resistance is loss of absorption capacity of bacteria.

[Study of morphology and genome structure of Pseudomonas putida bacteriophages for their classification].

A group of 27 bacteriophages specific for Pseudomonas putida strains PpG1 and PpN has been isolated. The phages were characterized and compared with the previously described virulent (pf 16, af, tf and PMW) and temperate (PP56 and PP71) phages. The new phages belong to B1 and C1 morphotypes, according to Ackerman's classification.

[Isolation and comparative characteristics of 2 unrelated temperate phages of Pseudomonas putida PpG1].

Two temperate bacteriophages, PP56 and PP71, specific for bacteria of Pseudomonas putida strain PpG1 have been isolated for the first time. Characterization of the phages was performed. Both of them accomplish stable lysogenization of P.

[Detection of transduction by virulent bacteriophage phi KZ of Pseudomonas aeruginosa chromosomal markers in the presence of plasmid RMS148].

A virulent phage of Pseudomonas aeruginosa, phi KZ which is able to package DNA of 210 MD is a general transducer. The transducing activity of phi KZ can be revealed when using recipient bacteria containing RMS148 plasmid (the P7 group of incompatibility). This plasmid blocks the development of phi KZ and prevents the phage to kill bacteria.

[Genetic and phenogenetic study of the ts-mutant group of Pseudomonas aeruginosa PA01 phage phi KZ].

A group of ts mutants of phi KZ phage specific for Pseudomonas aeruginosa was isolated and studied. A phi KZ phage particle has a unique feature: a specific structure as an internal body concerned with DNA packaging which is present in the phage capsid. Ts mutants were distributed into complementation groups.