[Changes in thymocyte size over time]

The dynamics of cell sizes was studied for rat thymus lymphocytes under a short-term culture in the Ringer-Krebs medium and in medium 199 with 10% serum, as well as under in vivo conditions. It has been shown that under incubation in the nourishing medium and in vivo, there are rhythmical changes in the shape of cell distribution according to sizes. Ionizing irradiation of cells causes an increase in the portion of small cellular forms, this process also being of phase character.