[Change in the microchromosome number in the process of macrochromosome spiralization in Gallus domesticus]. / Izmenie chisla mikrokhromosom v protesse spiralizatsii makrokhromosom u Gallus domesticus.

A correlation of mitotic spiralization of macrochromosomes with a change in the number of microchromosomes is detected. A wave character of microchromosomes variability during spiralization of macrochromosomes is suggested to be due to reversible despiralization of microchromosomes, which is probably a result of the colchicin treatment. Metaphase plates where the range of chromosome 1 length is from 10.5 to 12mu are recommended to calculate the number of microchromosomes.

[Reproduction of chicken chromosomes at the end of the DNA synthesis period]. / Reproduktsiia khromosom kur v kontse perioda sinteza DNK

Reduplication of chicken chromosomes at the end of S-period in the cells of bone marrow was studied, using the method of prolonged labelling with 3H-thymidine and autoradiography. It is shown that during the last hour of the S-period the DNA synthesis in macrochromosomes ends primarily in the centromere region and the regions adjacent to it. Sex chromosomes (ZZ) of cocks accomplish the reproduction simultaneously.

[Mortality and disablement as criteria in the evaluation of ecological situation]. / Smertnost' i invalidizatsiia naseleniia kak kriterii otsenki ékologicheskoi situatsii.

A uniform study analyzed criteria for evaluation of ecologic jeopardy of some territories. Mortality and disablement appeared to be inadequate for that evaluation. The authors suggest specific parameters for cities neighbouring to major chemical enterprises.

[Disease characteristics of the population on the territory of the city of Kirovo-Chepetsk]. / Kharakteristika zabolivaemosti naseleniia na territorii g. Kirovo- Chepetska.

Medical and ecologic evaluation of ecologic situation in Kirovo-Tchepetsk (Kirov region) included study of morbidity in the town and referent territories. Levels and dynamics of morbidity, prevalence, number of pathologic processes in children and other parameters could characterize the town as an ecologically unfavorable territory.