The urine protein content and the levels of nitric oxide in the uterus and placenta on days 13 and 20 of gestation were determined by sulfosalicylic acid test and nitric acid reductase method,respectively.

• 以磺柳酸法检测孕鼠第13,20日尿蛋白浓度; 硝酸还原酶法检测子宫、胎盘组织的一氧化氮(NO)含量。