[Mitotic activity and the nuclear volume of the epithelial cells of the rat cornea after a space flight on biosatellites].

On total preparations of the cornea of rats flown on Cosmos-936 and Cosmos-1129 the following parameters of the epithelial mitosis were studied: mitotic index, ratio of mitotic phases, number of abnormalities of cell division, and number of chromosome aberrations in anaphases. These parameters were considered to be indicators of physiological regeneration. The nuclear volume of cells of two inner epithelial layers was measured, using a modified karyometric technique that yielded representative data.

[Method of determining the surface areas of cell nuclei in monolayer tissue cultures].

To measure the surface area of cell nuclei in monolayer tissue cultures, special tables have been development. With respect to the two diameters, the tables allow identification of the logarithmic class to which the nucleus belongs. A specially designed rule with coordinate axes helps to save time involved in karyometry.