一氧化氮（NO）是内皮源性舒张因子（EDRF）的主要活性成分，它具有并参与多种生理功能及病理生理过程卜1。它是一种脂溶性很高的气体，在体内半衰期为五秒。人体内NO由L一征氨酸（L－afgine，L－AIg），在NO合成荫（NitricOX饲eGyflthe。Se，iNOS）催化下与氧反应而生成。还原 Nitric oxide (NO) is the major active component of endothelium-derived relaxing factor (EDRF), which has and participates in a variety of physiological functions and pathophysiological processes. It is a very fat-soluble gas with a half-life in the body of five seconds. NO is produced by the reaction of L-afgine (L-AIg) with NO in the body under the catalysis of Nitric Oxide eGyflthe. Se, iNOS. reduction