[The ultrastructural characteristics of the bronchial mucosa in chronic inflammation in participants in the cleanup of the aftermath of the accident at the Chernobyl Atomic Electric Power Station].

Bronchial biopsies from persons exposed to radiation after the Chernobyl accident with clinically verified chronic bronchitis were studied by electron microscopy. The results demonstrate transformed alterative, compensatory-adaptive and inflammatory reactions in bronchial mucosa of contingent. Nevertheless, their integral significance does not alter the nosologic form, and some structural equivalents have dynamic expression.

[Action of thymosin on the ultrastructure of the bone marrow in the rat].

A preparation isolated from thymus extract and possessing thymosin-like activity was studied for its influence on the ultrastructure of the rat bone marrow cells. A dose of the preparation adequate to therapeutic one (7 mg/kg) causes a transitory "irritation" (dystrophy and stimulation) in cellular elements of bone marrow. A supertherapeutic dose (70 mg/kg) has a definitely toxic effect on its cells and is characterized by an expressed tropism to the endothelium of sinusoids and capillaries.