[Electron microscopy and restriction analysis of bacteriophages isolated from quince and pear with symptoms of fire blight].

Phage populations of isolates from quince and pear affected with fire blight disease were studied using electron microscopy, restriction analysis and both agarose gel electrophoresis of particles and host range scoping method. The isolate from quince (pMA1) comprises at least three phage populations and two phage variants that can be detected on different bacterial indicators. After titration of this isolate on Erwinia amylovora the bacteriophage KEY of B1 morphotype with the genome size of 82.

[Reduction of chlorate in the presence of heavy metals by Acinetobacter thermotoleranticus C-1].

Influence of heavy metals on Acinetobacter thermotoleranticus C-1 was studied by the rate of chlorate reduction and biomass growth. It was established that Fe3+ in a form of free ion at concentration of 30 mg/l also stimulates both the reduction of chlorate by A. thermotoleranticus C-1 and the growth of biomass, Cd2+ Pb2+ and Mn2+ do not practically affect the process velocity or stimulate it a little, Cu2+ and Zn2+ lower the reduction rate of C10(3)- 2.

[Dissociation of Pectobacterium carotovorum subsp. carotovorumrelated to the changes in the cell wall lipopolysaccharide].

It is shown for the first time that population heterogeneity of Pectobacterium carotovorum subsp. carotovorum is applicable to a wide range of strains and therefore is a universal characteristic. Using the method of specific selection with the help of carotovoricins which are identical to the phage tails a set of population dissociants of different types was obtained, due to the fact that S-LPS is the part of the cell wall which contains their attachment sites.

[Reduction of chlorates by acinetobacter thermotoleranticus C-1 in the presence of chromate ions].

The rate of chlorate reduction by A. thermotoleranticus C-1 reached 59.6-63.

[Screening of the strains of lactic acid bacteria possessing hypocholesterinemic activity and their practical use].

The strains of lactic acid bacteria (n = 139) belonging to Lactobacillus, Streptococcus, Enterococcus and Leuconostoc genera have been studied. It has been shown that neither of the strains used cholesterol as a source of carbon. Some strains (13.