自由基清除剂对几种蔬菜衰老种子活力的影响

用外源自由基清除剂ＳＢＮ（１、２ｍｍｏｌ／Ｌ）和ＧＳＨ（０．００１、０．００５ｋｇ／Ｌ）浸种西瓜、甜瓜和萝卜衰老种子能显著促进其萌发，而ＡｓＡ（５、１０、１５ｍｍｏｌ／Ｌ）浸种效果不明显，上述处理要不同程度地提高衰老种子中ＣＡＴ和ＳＯＤ活性，降低Ｏ２＾－产生速率，减轻膜脂过氧化作用。

Effects of Free Radical Scavengers on the Vigor of Senescent Seeds of Some Vegetables

AIM: To reveals changes in the activity of controlling reperfusion damage and the effect of scopolamine on Na⁺-K⁺-ATPase activity in the cerebral cortex during postischemic reperfusion. METHODS: Selective cerebral hypothermia is taken as a positive contrast. Complete cerebral ischemia was produced by low pressure and low reperfusion. Thirty rabbits were randomly divided into: sham operation (group Ⅰ); cerebral ischemia (group Ⅱ); cerebral ischemia and reperfusion (groupⅢ); reperfusion with hypothermia (group Ⅳ); scopolamine and reperfusion (group Ⅴ); scopolamine and reperfusion with hypothermia (groupⅥ). RESULTS: Na⁺-K⁺-ATPase activity in the cerebral cortex is the lowest in groupⅢ; but it was greater in group Ⅱ, Ⅳ, Ⅴ, Ⅵ than group Ⅲ (P<0.05 or P<0.01), which was not significantly difference from groupⅠ(P>0.05); Na⁺-K⁺-ATPase activity of group Ⅵ was not significantly different from group Ⅳ, Ⅴ (P>0.05). CONCLUSION: Na⁺-K⁺-ATPase is not sensitive to ischemic damage, but sensitive to reperfusion damage.Like hypothermia, scopolamine can protect Na⁺-K⁺-ATPase activity in the cerebral cortex during postischemic reperfusion, but hypothermia has no cooperating effect on scopolamine.