At the fifth minute the treated groups (0.2?ml grou p and 05?ml group) were injected with 0.2 or 0.5? ml of carbonic acid buffer by abdominal cavi ty,respectively. At the third hour,all the rats were killed by decollation.

• 方法 4 0只SD大鼠被随机分为阴性对照组、阳性对照组、0 2ml碳酸缓冲液治疗组、0 5ml碳酸缓冲液治疗组。