[The biological effects of irradiation and hyperthermia]. / Biologicheskie éffekty oblucheniia i gipertermii.

Experimental data on the effects of radiation and hyperthermia on Chinchilla rabbits are presented. Multiple exposure to heat (40 degrees C, 20 min) between two radiation fractions was shown to influence favourably such haematological indexes as leukocyte and erythrocyte number and life-span of irradiated animals. Extra (to irradiation + heat) hyperthermia applied immediately before irradiation increased the radiation effect.

[Results of the cytogenetic examination of the people taking part in the clean-up of the accident at the Chernobyl AES]. / Rezul'taty tsitogeneticheskogo obsledovaniia lits, prinimavshikh uchastie v likvidatsii avarii na Chernobyl'skoi AES.

Chromosome preparations from peripheral blood cells of 117 subjects who took part in liquidation of Chernobyl NPP accident consequences in 1986 have been investigated. The number of chromosome aberrations has been shown to increase considerably. A short-term exposure has been found to be 5-7 times more effective than long-term one.

[Cytogenetic research on micropopulations of the root vole (Microtus oeconomus Pall.) living under various radioecological habitat conditions]. / Tsitogeneticheskoe issledovanie mikropopuliatsii polevki-ékonomki (Microtus oeconomus Pall.), obitaiushchikh v razlichnykh radioékologicheskikh usloviiakh.

Percentage of aneuploid cells and that of cell with chromosome aberrations in Microtus oeconomus Pall. living in areas with the enhanced radiation background (the dose of external radiation is 50 times and that of internal irradiation of bone marrow by incorporated 226Ra 10 times higher than the controls) exceeds significantly (p less than 0.05) the control values. It is concluded that mutations occur in the experimental animals more frequently than in the controls.

[Phenomenon of "chromosome coating"]. / K voprosu o fenomene "nadetost' khromosom".

The results are presented on the chromosome analysis of the human blood culture irradiated in the Co phase at doses of 100-500 r. 5733 cells were examined. The phenomenon of vesting, i.e. ring chromosomes encircling rod-shaped ones was observed in two metaphases at a dose of 500 r.