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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.

Partial Purification of the NADH-Nitrate Reductase Complex from Chlorella pyrenoidosa