Effect of vitamin E on platelet enzymatic anti-oxidants in the patients of myocardial infarction

Effect of administration of 600 mg. vitamin E each day, for six days, was observed on activity of some of the anti-oxidant enzymes and levels of malondialdehyde (as an index of free radical mediated damage) in the platelets of patients reperfused after myocardial infarction. It has been found that vitamin E administration significantly lowers the level of malondialdehyde in the patients. Vitamin E administration increases the activities of anti oxidant enzymes (viz. superoxide dismutase, glutathione reductase and catalase) tested both in the patients and healthy controls. Vitamin E administration causes general stimulation of anti-oxidant enzyme activities both in healthy persons and the patients, however, lowering of lipid per-oxidation upon administration of vitamin E is specific for patients. These findings exhibit beneficial role of vitamin E administration in the management of the patients reperfused after myocardial infarction.     

负载Cu,Ag氧化物催化剂的氧化活性和热稳定性

考究了Ａｌ２Ｏ３，ＣｅＯ２，ＴｉＯ２负载Ｃｕ，Ａｇ氧化物催化剂的氧化活性及ＣｕＯ／ＣｅＯ２，ＣｕＯ／Ａｌ２Ｏ３催化剂的稳定性。结果表明，载体对催化剂的活性有明显影响，对于ＣＯ氧化，Ｃｕ系催化剂中ＣｕＯ／ＣｅＯ２活性最高，Ａｇ系催化剂中，Ａｇ２Ｏ／Ａｌ２Ｏ３活性最好。     

A single bout of high-intensity interval exercise and work-matched moderate-intensity exercise has minimal effect on glucose tolerance and insulin sensitivity in 7- to 10-year-old boys

The purpose of this study was to assess the acute effect of high-intensity interval exercise (HIIE) and moderate-intensity exercise (MIE) on glucose tolerance, insulin sensitivity and fat oxidation in young boys. Eleven boys (8.8 ± 0.8 y) completed three conditions: 1) HIIE; 2) work-matched MIE; and 3) rest (CON) followed by an oral glucose tolerance test (OGTT) to determine glucose tolerance and insulin sensitivity (Cederholm index). Fat oxidation was measured following the OGTT using indirect calorimetry. There was no effect for condition on plasma [glucose] and [insulin] area under the curve (AUC) responses following the OGTT (P > 0.09). However, there was a “trend” for a condition effect for insulin sensitivity with a small increase after HIIE (P = 0.04, ES = 0.28, 9.7%) and MIE (P = 0.07, ES = 0.21, 6.5%) compared to CON. There was an increase in fat oxidation AUC following HIIE (P = 0.008, ES = 0.79, 38.9%) compared to CON, but with no differences between MIE and CON and HIIE and MIE (P > 0.13). In conclusion, 7- to 10-year-old boys may have limited scope to improve insulin sensitivity and glucose tolerance after a single bout of HIIE and MIE. However, fat oxidation is augmented after HIIE but not MIE.     

对硝酸氧化性的探讨

从硝酸的结构、反应动力学以及还原过程的能量效应方面,讨论了影响硝酸在氧化还原过程中生成不同     

氧化还原滴定误差计算方法的探讨

在被滴物浓度不太低的情况下,讨论了氧化还原滴定过程中,由于指示剂变色电位与化学计量点电位不符而引起的误差,并建立了一种计算方法.     

牛磺酸对一次性力竭运动大鼠肝组织氧化损伤的预防作用研究

目的:观察牛磺酸对一次性力竭运动大鼠肝组织氧化损伤作用及其超微结构损伤的保护作用.方法:将30只2月龄雄性SD大鼠随机分为3组:正常对照组(A组),一次性力竭运动组(B组),一次性力竭运动 牛磺酸干预组(C组),运动后测量肝组织丙二醛(MDA)含量,超氧化物歧化酶(SOD)活性,谷胱甘肽过氧化物酶(GSH-PX)活性,同时观察肝组织超微结构的变化.结果显示:C组大鼠运动时间明显延长,(p＜0.01),运动后即刻SOD活性,GSH-PX活性明显提高(p＜0.05);B组MDA含量明显增加(p＜0.05),超微结构显示,力竭运动导致肝细胞内线粒体明显减少,内质网明显断裂,细胞空化,细胞膜,核膜结构破损.结论:牛磺酸可提高大鼠的运动能力,具有抗疲劳作用;具有抗氧化损伤的作用;可有效保护肝组织结构及其超微结构的损伤.     

氧化还原反应的方向限度与速度

对氧化还原反应的讨论,常常仅局限于讨论反应方向和限度而忽略对反应速度的研究,这种片面性最终导致对一些反应的讨论结论与事实严重不符.只有不仅从热力学角度,同时从动力学角度才能完整地认识氧化还原反应的特点和本质从而得出与事实相符的正确结论.     

次氯酸钠冷法研制玉米淀粉粘合剂

用次氯酸钠为氧化剂 ,制备了能够粘合铝箔及瓦楞纸箱的淀粉胶 .对反应原理和实验条件进行了论述     

短杆菌素在玻碳电极上的电化学氧化行为的研究

本文采用了线性扫描伏安法 (LSV) ,循环伏安法 (CV) ,双电位阶跃计时库仑法 (CC)等多种现代电化学方法并结合紫外可见吸收光谱法 ,研究了短杆菌素 (TYN)在不同的 pH缓冲溶液中 ,于玻碳电极上的电化学氧化行为和反应机理。研究结果表明TYN在玻碳电极上的氧化是一个不可逆过程 ,该不可逆过程中质子转移数与电子转移数相等。TYN本身在玻碳电极上吸附性不强 ,其电化学氧化反应基本上以扩散控制为主 ,而其电极反应产物不具有电化学活性 ,能强烈吸附于玻碳电极表面 ,从而阻碍反应的进行     

运动与能量代谢过程中丙二酸单酰辅酶A 的调节

在查阅大量文献的基础上,从Ｍ－ＣｏＡ的生物学功能及其调节角度,阐述在运动和营养干预条件下骨骼肌内Ｍ－ＣｏＡ的变化及其调节机制,为进一步探讨运动时脂肪酸利用的影响因素的指导运动训练提供新思路。