Chromatin structure and the state of human organism.

The state of chromatin in human buccal epithelium cell nuclei upon the influence of sport trainings was investigated. Chromatin state was evaluated in interphase buccal cell nuclei after orcein staining. The heterochromatin granule quantity (HGQ) was estimated in 30 nuclei per sample, and for every donor the mean HGQ value per 30 cells was determined.

[Effect of culture density on the polyteny degree of giant chromosomes in inbred lines and hybrids of Drosophila melanogaster].

The influence of culture density and genotype on the polyteny degree of giant chromosomes (PDC) in Drosophila melanogaster was investigated. The reliable depression of the polytene chromosomes endoreduplication function under increased culture density was revealed. The essential dependence of the PDC on the genotype was shown.

[The effect of heterosis on inheritance of quantitative traits in silkworm exposed to electromagnetic irradiation].

The effect of heterosis was studied in several quantitative traits of clone breed and interbreed silkworm hybrids exposed to electromagnetic irradiation (lambda = 1.6 cm, power density 700 microW/cm2) during postdiapause embryonic development. The influence of the type of reproduction on the manifestation of irradiation effects in the next generation was also examined.

[Influence of the genotype on the polytene chromosome puffing and bioelectrical properties of cellular nuclei of Drosophila melanogaster treated with ecdysone in vivo and in vitro experiments].

Activity of polytene chromosome puffs at the 0-hour prepupae stage and bioelectric properties of cellular nuclei of salivary glands were investigated under the influence of the hormone 20-OH-ecdysone in vitro in highly inbred selected lines LA (low activity) and HA (high activity) and their F1 hybrids LA x HA and Ha x LA. The inadaptive line LA differs from the line HA by the smaller size of the puffs. The hybrids exceed the best parental line by the size of the majority of the investigated puffs.

[The effect of the genotype on the expressiveness of the vestigial trait and polyteny of chromosomes in Drosophila melanogaster Meig].

The effects of the Bar (B) and white (w) mutations on the expressiveness of the character vestigial (vg) and the degree of polyteny of salivary gland giant chromosomes were studied in Drosophila melanogaster. Either mutation changed both the expressiveness of vestigial and the degree of chromsome polyteny. A negative association between the vg expressiveness and the degree of chromosome polyteny was revealed and proved to be stronger in females than in males.