[Histostereologic analysis of the myocardium of homoiothermic animals during cooling].

A stereologic study of the myocardium exposure to cold for 4 hours, 8 and 16 days was carried out on Wistar rats. It has been shown that during the first 8 days acute hemodynamic disorders and cardiomyocyte contractures developed. These changes were followed by a decrease in the volume and surface capillary density resulting in the impairment of transcapillary exchange and reduction of the intracellular regeneration processes in cardiomyocytes.

[Ultrastructural localization of thiamine pyrophosphatase activity in the epitheliocytes of duodenal biopsies in peptic ulcer].

Using electron microscopic studies the location of thiamine pyrophosphatase (TPPase) activity in the epithelial cells of duodenal mucosa was investigated in 39 patients with ulcer exacerbation and during the disease remission. The biopsy material was studied before and after the administration of physiological and therapeutic doses of thiamine. TPPase activity was detected on the membranes of Golgi complex, lateral cell membrane and microvilli.

[Stereologic ultrastructural and cytochemical study of myocardial hypertrophy during gerontogenesis].

The myocardium of male Wistar rats aged 4, 24 and 33 months was examined using stereological techniques to determine the volume and surface densities of the ultrastructure of cardiac myocytes. Electron microscopy was used to detect succinate dehydrogenase in mitochondria. The myocardium of senescent animals was shown to be hypertrophied.