方法：采用放射免疫分析法和硝酸还原酶法测定20例HIE新生儿和20例正常新生儿血浆et与血清NO水平。
Methods: Plasma et levels were determined by using a radioimmunoassay kit, serum no levels were determined by using a nitrate reductase method in 20 newborn with HIE and 20 normal newborn.
超氧化物歧化酶（SOD）、过氧化物酶（POD）和硝酸还原酶（NR）活性也随氯化胆碱浓度的增大而明显提高。
The activities of superoxide dismutase (SOD), peroxidase (POD) and nitratase (NR) in leaves increased with increasing of concentrations of CC.
冻融交替作用明显地增强土壤中磷酸酶、硝酸还原酶和亚硝酸还原酶的活性。
The effect of alternative freezing and thawing can enhances the activities of some soil enzymes greatly, such as phosphatase, nitrate reductase and nitrite reductase.
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