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Homogenates of Crithidia fasciculata were fractionated by differential centrifugation. Mitochondria were sedimented quantitatively at 10(4) g-min and accounted for approximately 10% of the total recovered protein. Catalase was found exclusively in the supernatant fraction whilst NADH:cytochrome c oxidoreductase and p-nitrophenylphosphatase were found in all the fractions. Zonal centrifugation confirmed that catalase was non-sedimentable. Clean separation of mitochondria was obtained in both high-speed and rate zonal experiments, but no NADH:cytochrome c oxidoreductase activity could be detected in these organelles. Separation of large lysosomal vacuoles which contained p-nitrophenylphosphatase activity was obtained and these were clearly resolved from mitochondria by both high-speed and rate zonal centrifugation.

Subcellular Fractionation by Differential and Zonal Centrifugation of the Trypanosomatid Crithidia fasciculata