Materials and Methods: Twelve male SD rats were divided into four groups randomly: group A: cerebral ischemia 1h(3 rats), group B: cerebral ischemia 1.5h(3 rats), group C: cerebral ischemia 3h(3 rats), group D: cerebral ischemia 6h(3 rats).

• 方法:清洁级健康雄性SD大鼠12只；分成4组:A组脑缺血1h(3只)；B组脑缺血1.；5h(3只)；C组脑缺血3h(3只)；D组脑缺血6h(3只)。