Methods; The responses of the isolated thoracic aortic rings of rats to acetylcholine ( Ach) , sodium nitroprusside (SNP) and NG-nitro-L-arginine methyl ester (L-NAME) were observed after the incubation with OA and OA + DMA respectively.

• 方法:分别用OA及OA＋DMA温育离体大鼠胸主动脉环,观察其对乙酰胆碱(Ach),硝普钠(SNP),L－N－硝基精氨酸甲酯(L－NAME)的反应。