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Diaminobenzidine reactivity of mitochondria and peroxisomes in Tetrahymena and in wild-type and cytochrome oxidase-deficient Paramecium

N Stelly, M Balmefrezol and A Adoutte

Reactivity of mitochondria and peroxisomes to diaminobenzidine was investigated in Tetrahymena pyriformis and in wild-type and cytochrome oxidase-deficient Paramecium aurelia. Wild-type and cytochrome oxidase- deficient Paramecium gave positive mitochondrial reactions in the absence of added H2O2, and the deposits were enhanced by the addition of H2O2, whereas Tetrahymena gave positive mitochondrial reactions only upon addition of H2O2. These results are discussed in the light of the current ideas concerning the mechanism of staining by diaminobenzidine. Peroxisome-like organelles which react positively to diaminobenzidine, the reaction being partially inhibited by aminotriazole, were identified in both protozoa.

Volume 23, Issue 9, pp. 686-696, 09/01/1975
Copyright © 1975 by The Histochemical Society


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