[Characteristics of development of the rat embryonal lung after resection of the maternal lung].

Histological and electron microscopic studies of embryos from pulmonectomized female rats have revealed retarded differentiation of respiratory rudiment epithelium manifested in delayed appearance of osmiophylic laminar corpuscles and decreased number of type II pneumocytes in respiratory rudiment lining. Osmiophylic laminar corpuscles in them were less differentiated, as compared to the control. In addition, embryonic lungs in pulmonectomized rats were characterized by excessive mesenchyma development and respective decrease in respiratory rudiment area.

[Experimental study of the effect of the stage of pregnancy on growth-regulating properties of female sera].

The primary embryonic rat culture technique has shown that the allogeneic serum of females is capable of changing the intensity of in vitro proliferation of fibroblasts and epithelial cells during days 9--18 of pregnancy. This fact should be taken into consideration in experiments with the use of pregnant animals' serum.

[Effect of allogenic serum from pregnant pneumonectomized rats on embryonic lung tissue].

Allogenous blood serum of rats subjected to unilateral pulmonectomy during pregnancy produced a growth-stimulating action directed chiefly to fibroblasts in the primary monolayer culture of the embryonic lung of Wistar rats. This effect was most pronounced on the 3rd day of cultivation.