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- W2131556118 abstract "The applicability of phenazine methosulfate, 1-methoxyphenazine methosulfate, menadione, and meldola blue as exogenous electron carriers for the cytochemical staining of nicotinamide adenine dinucleotide (phosphate) (NAD(P))-dependent dehydrogenases has been studied quantitatively with tetranitro BT in vitro and with a model system of polyacrylamide films incorporating either purified glucose-6-phosphate dehydrogenase or intact rat liver parenchymal cells. It was found that every assay in which a tetrazolium salt is used, whether or not an electron carrier is present, has to be carried out in darkness. Menadione did not appear to be useful, because electrons were not found to be transferred directly from reduced nicotinamide adenine dinucleotide (phosphate) (NAD(P)H) to this compound. Phenazine methosulfate at higher concentrations and meldola blue at concentrations optimal for carrying electrons to tetrazolium salts yielded a high level of nothing dehydrogenase activity in cell-containing films, but no inhibition of enzymatic activity was found. Factors involved in the interference of oxygen with tetrazolium salt reduction are discussed. 1-Methoxyphenazine methosulfate did not stain cellular compounds and caused only a very low nothing dehydrogenase activity. The cytochemical demonstration of dehydrogenase activity was shown to be independent on the concentration of 1-methoxyphenazine methosulfate used (50-1000 microM). It is concluded that 1-methoxyphenazine methosulfate is the exogenous electron carrier of choice." @default.
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- W2131556118 date "1982-01-01" @default.
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- W2131556118 title "The role of exogenous electron carriers in NAD(P)-dependent dehydrogenase cytochemistry studied in vitro and with a model system of polyacrylamide films." @default.
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- W2131556118 doi "https://doi.org/10.1177/30.1.6172468" @default.
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