[Changes in cellular radiosensitivity by modifying the cytoplasmic membranes]. / Izmenenie radiochuvstvitel'nosti kletok putem modifikatsii tsitoplazmaticheskikh membran.

The radiosensitivity of mouse myeloma and E. coli cells in the presence of Mg2+ and UO2(2+) ions has been investigated. It has been shown that Mg2+ ions (10(-4) M) do not influence the viability of E. coli and mouse myeloma cells. The presence of Mg2+ ions during irradiation reduces the survival rate of E. coli cells, but the addition of Mg2+ ions after irradiation does not influence the radiosensitivity of E. coli cells. Comparison of the results on the influence of Mg2+ ions upon cells and bilayer lipid membranes (BLM) permits us to suppose that Mg2+ ions increase the positive charge of the membranes thus promoting the increase in the number of short-lived radiolysis products which impair membranes and increase cell radiosensitivity. UO2(2+) ions (10(-4) M) increase the radioresistance of E. coli cells which can be associated with the increase in the lateral membrane viscosity, as it was shown in the studies on BLM.

[Pulsed radiolysis of aqueous solutions of serum albumin containing naphthoquinones]. / Impul'snyi radioliz vodnykh rastvorov syvorotochnogo al'bumina, soderzhashchikh naftokhinony.

As was shown by the pulse radiolysis method the simultaneous presence of naphthoquinone and human serum albumin molecules in an aqueous solution leads to the adsorption of the former on the surface of the latter. It is suggested that in these conditions the protein tertiary structure changes. New conformation reduces the reactivity of albumin toward the hydrated electron.

[The effect of the frequency of periodic irradiation on the rate of inactivation of E. coli cells]. / Vliianie chastoty periodicheskogo oblucheniia na skorost' inaktivatsii kletok E. coli.

It was shown that the periodic radiation source frequency influences the rate of E. coli cell inactivation. The impulse duration from 2 microseconds to 40 ns does not influence the survival of E. coli. The analysis of the survival curves obtained permitted to assess the contribution of the direct and indirect effects of radiation to microorganism inactivation.

[The use of the pulse radiolysis method in the study of rapid processes in suspensions of Escherichia coli]. / Issledovanie metodom impul'snogo radioliza bystroprotekaiushchikh protsessov v suspenzii Escherichia coli.

It was proved that the method of pulse radiolysis can be used to study the processes rapidly occurring in a microorganism suspension. It was shown that optically active particles formed after irradiation in an E. coli cell were involved into the first-(pseudo-first)-order reaction the rate constant being approximately 30 s-1. The presence of oxygen did not influence the kinetics of disappearance of these particles.