The nitrate reductase complex from Chlorella pyrenoidosa has been purified by a procedure which includes as main steps, ammonium sulfate fractionation, polyethylene glycol treatment, and DEAE-cellulose chromatography. The Michaelis constants for NADH, FAD, and NO(3) (-) in the NADH-nitrate reductase assay are 10 mum, 2.6 mum, and 0.23 mm, respectively. Heat treatment exerts varying effects on the enzymatic activities associated with the nitrate reductase complex.
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Schloemer et al. (1973) studied this question.
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