[Variability of Bacillus thuringiensis bacteriophages with C2-morphology].

Biological as well as physicochemical properties of Bacillus thuringiensis bacteriophages "17" and "7/13" having C2-morphology and isolated from factory phagolysates were studied. The bacteriophages are identical in the lytic spectrum++, morphology, size, GC-content, have the same buoyant density. The physical map for restriction endonucleases EcoRI, HindIII, SalGI and MvaI has been constructed of the bacteriophages DNA.

[Electrophoretic mobility of UV-irradiated bacterial cells].

Electrophoretic mobility of Escherichia coli cells exposed to various doses of UV-radiation was investigated. The method of free flow electrophoresis was used to study a correlation between membrane protein charge and cell surface electric charge. The change in the cell surface charge and electrophoretic motility was associated with the damage to membrane proteins and the survival of UV-irradiated bacteria.

[Changes in the electrical characteristics of bacterial cells in the disruption of the barrier function of the cytoplasmic membrane].

A change in the electro-orientation spectrum followed by a change in the electric characteristics of bacterial cells had been measured when the barrier function of the cytoplasmic membrane was disordered under the action of damaging physical and chemical factors. Analysis of changes in the spectra at a frequency of 10(4) to 10(7) Hz allows one to estimate the degree of cell damage in quantitative terms. The paper presents the results of comparing three procedures for such an estimation: inoculation onto solid growth media; linear regression analysis of an electro-orientation spectrum; comparison of the electro-orientation effect at a high frequency (ca.

[Chemical mutagenesis and the use of indirect enzymatic criteria for the selection of virulent clones of Bacillus thuringiensis].

The effect of the mutagene nitrosoguanidine (N-methyl-N'-nitro-N-nitrosoguanidine) on the growth of Bacillus thuringiensis subsp. galleriae st. 69/6 was being studied.