[Microecology of nuclear reactor pool water]. / Mikroékologiia vody okhlazhdaiushchego basseina iadernogo reaktora.

In the course of research it was found that the circulation of pool water through the nuclear reactor core produces a bactericidal effect of microflora due to the influence of radiation of various types. The amount of microbes returns to initial level after 2-4 months after circulation was stopped. Microflora of pool water comprises large amounts of coccus, Gram-positive rods, fungi and a lower content of Gram-negative rods if compared to water which had been used to fill reactor pool. No difference in radioresistance was noticed for unitype microbes isolated from initial water and from reactor pool water. Quality of microflora reflects a unique phenomenon called "selection" which results in vanishing of all the radiosensitive types of microbes and survival of the radioresistant types. Radioresistance grows with increasing of catalase and nuclease activity.

[Determination of radioresistance of microbes of different species irradiated separately and jointly]. / Opredelenie radiorezistentnosti mikrobov raznykh vidov pri razdel'nom i sovmestnom obluchenii.

Radioresistance of lactose positive and lactose negative Esch. coli, lactose positive Esch. coli and proteus, yellow sarcina and white staphylococcus, white and pink yeasts, white and yellow staphylococcus was studied after irradiation and seeding on hard media using separate and combined methods. In most cases radioresistance of the microbes did not depend of exposure conditions. However, lactose positive Esch. coli irradiated with proteus increased proteus radioresistance to its own standard. Yellow staphylococcus cannot form yellow pigment after irradiation with a dose of 1000 Gy.

[Effects of single and fractionated irradiation on Bacillus subtilis spores under different incubation conditions]. / Vliianie odnokratnogo i fraktsionnogo oblucheniia na spory Bac. subtilis pri razlichnykh usloviiakh ikh inkubatsii.

Effect of 60Co gamma-rays on inactivation of Bac. subtilis spores was studied. In the course of investigation, the dose of gamma-rays was divided in to two parts with an interval of 4 or 24 hours between irradiation. Fractional irradiation was found to be more effective for decontamination of Bac. subtilis spores than single irradiation.