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• W2105422846 abstract "Prominent staining of rat hepatic microbodies was obtained by incubating sections of aldehyde-fixed rat liver in a modified Graham and Karnovsky's medium for ultrastructural demonstration of peroxidase activity. The electron-opaque reaction product was deposited uniformly over the matrix of the microbodies. The microbodies were identified by their size, shape, presence of tubular nucleoids, and other morphologic characteristics, and by their relative numerical counts. The staining reaction was inhibited by the catalase inhibitor, aminotriazole, and by KCN, azide, high concentrations of H(2)O(2), and by boiling of sections. These inhibition studies suggest that the peroxidatic activity of microbody catalase is responsible for the staining reaction. In the absence of exogenous H(2)O(2) appreciable staining of microbodies was noted only after prolonged incubation. Addition of sodium pyruvate, which inhibits endogenous generation of H(2)O(2) by tissue oxidases, or of crystalline catalase, which decomposes such tissue-generated H(2)O(2), completely abolished microbody staining in the absence of H(2)O(2). Neither diaminobenzidine nor the product of its oxidation had any affinity to bind nonenzymatically to microbody catalase and thus stain these organelles. The staining of microbodies was optimal at alkaline pH of 8.5. The biological significance of this alkaline pH in relation to the similar pH optima of several microbody oxidases is discussed. In addition to staining of microbodies, a heat-resistant peroxidase activity is seen in some of the peribiliary dense bodies. The relation of this reaction to the peroxidase activity of lipofuscin pigment granules is discussed." @default.
• W2105422846 created "2016-06-24" @default.
• W2105422846 creator A5052865708 @default.
• W2105422846 date "1969-11-01" @default.
• W2105422846 modified "2023-09-25" @default.
• W2105422846 title "CYTOCHEMICAL LOCALIZATION OF PEROXIDATIC ACTIVITY OF CATALASE IN RAT HEPATIC MICROBODIES (PEROXISOMES)" @default.
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• W2105422846 doi "https://doi.org/10.1083/jcb.43.2.275" @default.
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