[Diurnal variations in the duration of mitosis in the mouse esophageal epithelium]. / O sutochnykh variatsiiakh dlitel'nosti mitoza v épitelii pishchevoda myshei

Considerable differences were found in the morning and the evening mitotic indices of the epithelium in the oesophagus of C57BL/6J mice. By the colchamin method it was shown that the duration of mitosis was the same in the morning and the evening hours and was equal to 34--49 minutes. The results varied and depended on the dose of colchamin and duration of its action. Thus, the diurnal differences in mitotic index of the epithelium in the oesophagus depended on the differences in mitotic activity, the number of mitoses per time unit. It is emphasized that colchamin method should be used with great caution to obtain reliable results.

[Characteristics of the mammalian capacity of regeneration]. / K kharakteristike regeneratsionnoi sposobnosti mlekopitaiushchikh.

In spite of certain limitations of the regenerative ability in mammals, they are characterized by four types of regenerative processes: regeneration of parenchymatous organs, regeneration of parts of organs, intraorganic regeneration, intracellular regeneration. These types of regenerative processes may be called forth both by surgery and pathological factors: infection, irradiation, effect of toxic agents etc. The restoration following the destruction caused by pathological factors is an extremely widespread process and it should be paid more attention when analyzing the regenerative ability in mammals. The characteristics of the latter is complicated by the insufficient progress of comparative-evolutionary studies concerning all types of restoration, especially that caused by pathological factors.