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A cytochemical staining method was developed for the demonstration of hydrogenase activity in hydrogenosomes of Trichomonas vaginalis. After fixation in low concentrations of glutaralde-hyde under strictly anaerobic conditions and incubation of these cells in the presence of H2 and the tetrazolium compound 2-(2′-benzothiazolyl)-5-styryl-3-(4′-phthalhydrazidyl)-tetrazolium chloride, an electron-dense deposit was produced in the hydrogenosomes. The method was used to demonstrate the hydrogenosomal nature of similar microbodies of the sapropelic ciliates Plagiopyla nasuta and Trimyema compressum.
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