[Investigation of the processes of post-radiation reparation of the corneal epithelium cells of mice irradiated by helium ions with various LET values].

Biological effectiveness and post-radiation recovery of corneal epithelium cells of mice were studied. Mice were exposed to a broad range of doses from accelerated helium ions with the energy of 4 MeV/nucleon and 4 GeV/nucleon once and twice with a 24-hr. interval.

[Cytogenetic effect of the radiosensitizing action of 5-bromo-2'-deoxyuridine on eukaryotic cells at various periods of the DNA synthesis phase].

The effect of 5-bromo-2'-deoxyuridine (BUDR) radiosensitizing action on meristematic cells of wheat seedlings and human peripheral blood lymphocytes synchronized with 5-fluoro-2'-deoxyuridine at the G1-S boundary was revealed. This effect was only found in the beginning of the S phase. We show that it was conditioned by incorporation of BUDR into special early replicating DNA sequences which are specific for chromosomal mutagenesis.