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Oxidative enzymes in the development of Fasciola hepatica L. IV. The activity of oxidases and dehydrogenases in redia.

The object of the study was to investigate the occurrence and localization of oxidative enzymes in the redia -- the third larval stage of Fasciola hepatica L. The author detected cytochrome oxidase, peroxidase, NADH and NADPH tetrazolium reductases (diaphorases), as well as succinate, isocitrate, malate, lactate, alpha-glycerophosphate, glyceraldehyde phosphate, glucose-6-phosphate, 6-phosphogluconate, beta-hydroxybutyrate, L-glutamate, and alcohol dehydrogenases. The presence and localization of the enzymes in various periods of development of the redia were detected with histochemical methods. Out of the studied oxidases and dehydrogenases only cytochrome oxidase was found to be absent from the stages of young rediae. It was ascertained that the redia uses all three paths of release of energy i.e. the glycolytic, Krebs, and pentose cycles, glycolysis being presumably the principal mode of energy production.