[Circadian variations of Ns and Nm values in the intestinal epithelium of the fish C. auratus and of mice, and its effect on radiosensitivity].

Studying the small bowel mucosa crypts of the mouse, the authors indicate a method to calculate cell production that does not need to know the mitotic proliferation and labeling indexes, employing instead the values for NS and Nm, or size of S and M phases. While NS and Nm vary during the day, TS and Tm remain practically constant, so that cell production is related to the values of NS and Nm. Calculations starting from NS and Nm give per cent cells h-1.