[DNA apurinization and apyrimidinization of gamma-irradiated silkworm embryos at different developmental stages]. / Issledovanie apurinizatsii i apirimidinizatsii DNK gamma-obluchennykh émbrionov tutovogo shelkopriada na raznykh stadiiakh razvitiia.

A study was made of the formation and repair of apurine-apyrimidine (AP) sites in DNA of gamma-irradiated 3- and 7-day embryos of Bombyx mori differing drastically in radiosensitivity. The number of AP-sites in DNA immediately after irradiation was much larger in DNA of 3-day embryos than in DNA of 7-day embryos. The kinetics of the postirradiation recovery of AP sites in DNA of 3- and 7-day Bombyx mori embryos was heterogeneous and varied significantly.

[A comparative study of the DNA structural damages and synthesis in embryos of the silkworm Bombyx mori irradiated with gamma rays at different developmental stages]. / Sravnitel'noe issledovanie strukturnykh povrezhdenii i sinteza DNK v émbrionakh tutovogo shelkopriada Bombyx mori, obluchennykh gamma-luchami na raznykh stadiiakh razvitiia.

Studies have been made on formation and reparation of apurine-apyrimidine (AP) regions, monothread DNA ruptures, as well as on inhibition and recovery of DNA synthesis in gamma-irradiated 3- and 7-day embryos of the silkworm which sharply differ in their radiosensitivity. It was shown that in 3-day embryos, the number of AP regions and DNA ruptures immediately after irradiation is significantly higher than in 7-day embryos. DNA synthesis is more radiosensitive in 3-day embryos as compared to that in 7-day ones. Kinetics of postradiation recovery of regions and DNA ruptures in 3- and 7-day embryos is heterogeneous and significantly different. However, radiation inhibition and postradiation recovery of DNA synthesis in irradiated 3- and 7-day embryos are associated mainly with postradiation survival of these embryos.

The effect of low level ionizing radiation on embryogenesis of silkworm, Bombyx mori L.

The effect of chronic radiation, 100, 1000 and 4000 times exceeding the natural background radiation, on embryogenesis of silkworm, Bombyx mori has been investigated. It is shown that low level ionizing radiation shortens by several hours the period of embryogenesis while the larva mass increases as the development proceeds. A single preincubational exposure of silkworm eggs to a dose of 2 Gy increases the mass of larvae as well as the cocoon shell weight, silk-bearing and the raw silk production.

[Effect of chronic low-intensity gamma irradiation on embryogenesis in the silkworm (Bombyx mori L.)]. / Vliianie khronicheskogo gamma-oblucheniia maloi moshchnosti na émbriogenez tutovogo shelkopriada (Bombyx mori L.).

Gamma irradiation of a grain during embryogenesis at an intensity only 100 times exceeding that of the natural radioactive background reduces by 4-7 h the average time of embryogenesis for different species and hybrids of thesilworm embryo. The 10- and 40-time increase in the radiation intensity decreases the stimulatory effect and leads to the delay in the development.

[Effect of low-dose gamma-irradiation of silkworm eggs on the development of the mulberry silkworm (Bombyx mori L.)]. / Vliianie gamma-oblucheniia greny v malykh doz na razvitie tutovogo shelkopriada (Bombyx mori L.).

Chronic gamma-irradiation of an egg at a dose-rate 100, 1000 and 4000 times as high as that of the natural radiation background significantly accelerates the development of Bombyx mori L. The caterpillar development may also be stimulated by a single exposure of the egg to 2 Gy radiation. The acceleration of the caterpillar growth promotes the increase in the cocoon weight and the raw-silk mass.