[Comparative study of the radiosensitivity of normal and regenerating tissues. 1. Interphase cell death and degree of aplasia of regenerating and normal bone marrow and spleen tissues in C57Bl mice]. / Sravnitel'noe issledovanie radiochuvstvitel'nosti normal'nykh i regeneriruiushchikh tkanei. Soobshchenie 1. Interfaznaia gibel' kletok i stepen' aplazii regeneriruiushchikh i normal'nykh tkanei kostnogo mozga i selezenki myshei.

A comparative study of radiosensitivity of cells of normal and regenerating tissues of bone marrow and spleen has demonstrated that single exposure to X-rays produces a lesser damaging effect on regenerating tissues than on normal ones. The data obtained indicate that the increase in radioresistance of the organism during active regeneration of the haemopoietic organs is due not merely to the increase in the dividing cell pool of these organs but also to qualitative changes in their functional state.

[Effect of cyclophosphane on the bone marrow of redbacked voles]. / Vliianie tsiklofosfana na kostnyi mozg ryzhikh polevok.

The paper presents the data on the effect of cyclophosphane on the bone marrow cells of bank voles (Clethrionomys glareolus). The percentage of aberrant cells after injection of cyclophosphane was shown to be higher in experimental animals than in control at different intervals after injection, mitotic activity and the interphase death being decreased and increased, respectively.

[Cytogenetic differences in radiation effects on red-haired field mice from different geographic populations]. / Tsitogeneticheskie razlichiia radiatsionnogo éffekta u ryzhikh polevok iz raznykh geograficheskikh populiatsii.

The paper presents the data on the effect of X-rays on the incidence of chromosome aberrations and on the mitotic activity of bone marrow cells in two geographical populations of Clethrionomys glareolus. It is shown that the percentage of aberrant cells at different intervals after the irradiation (350 r) is higher in the Moscow population than in the Komi ASSR population. The fractionation radiation results in different increase in the number of aberrant cells. The change of the mitotic activity after X-irradiation was also different in these two geographical populations.