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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 glutaraldehyde 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.

Cytochemical Localization of Hydrogenase Activity in the Anaerobic Protozoa Trichomonas vaginalis, Plagiopyla nasuta and Trimyema compressum