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The action of Ca2+ on H2O2 formation catalyzed by an NADPH-dependent H2O2-generating system was studied in a thyroid particulate fraction. It was shown that H2O2 formation was inhibited by EGTA and restored in the presence of micromolar concentrations of free Ca2+, and that Mg2+ was unable to restore the activity of the EGTA-inhibited particulate fraction.(More)
Solubilization of the thyroid particulate-associated NADPH-dependent H2O2 generating system has been tested with different detergents; (3-(3-cholamidopropyl)-dimethylammonio)1-propane sulfonate (CHAPS) was found to be the best of the six detergents tested. The ratio of H2O2 generation to NADPH oxidation was similar for CHAPS extract and native particulate(More)
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