[The cause-effect relationships between different indices of radiation lesions of the thymocytes].

The dependence of the kinetics of different thymocyte injuries of the experimental conditions was investigated. It was shown that the rate of cell death detecting by cell staining decreases with the increase of the dye molecular size. Different organic substances decrease the staining rate of the dead cells with trypan blue but increase the rate of DNA fragmentation.

[The intercellular interactions in the interphase death of irradiated thymocytes. A study of the nature of the mediator of the interaction of irradiated thymocytes].

A study was made of the influence of cytosol and conditioned medium, obtained at different times of incubation of irradiated thymocytes, on native thymocytes, as well as of the influence of mixing the suspension and changing the medium and the enzyme inhibitors, involved in metabolism of arachidonic acid, on the radiation injury to thymocytes. Cytosol of thymocytes, incubated for 60 min after irradiation, was shown to exert an insignificant toxic effect on native thymocytes. The conditioned medium of irradiated thymocytes is virtually ineffective.

[The intercellular interactions in the interphase death of irradiated thymocytes. A study of the influence of different cells on thymocyte interphase death].

The influence of different cells on death and pycnosis of thymocyte nuclei after in vitro irradiation has been investigated. It has been shown that the removal from the thymocyte suspension of cells, having the activity of natural killers, medullar thymocytes, and macrophages, does not influence the radiation-induced damage to cortical thymocytes. The injury of exposed thymocytes decreases, however, after incubation them with nonirradiated thymocytes or cultured cells, the efficiency of the latter being dependent on the type of cells.

[The interphase death of dividing cells. The relation of interphase death to cell energy requirements].

In experiments with irradiated cells of Chinese hamster and Ehrlich ascites tumor a study was made of the influence of energy provision on their interphase death rate. The presence of the uncoupler of respiration and oxidative phosphorylation--carbonyl cyanide-3-chlorophenylhydrazone--in a medium without glucose was shown to drastically increase the interphase death rate of cells of both types, whereas this effect was not observed in a medium with glucose.

[The interphase death of dividing cells. The effect of oxygen and the pH of the medium on the interphase death of Ehrlich ascites carcinoma cells under the action of ionizing radiation].

Interphase death of in vitro irradiated (200 Gy) Ehrlich ascites tumor cells was studied as a function of oxygenation level and medium pH. The presence of oxygen both during and after irradiation as well as the increase in pH from 7.4 to 8.