Science Letters： Structure relationship of nitrochlorobenzene catalytic degradation process in water over palladium-iron bimetallic catalyst

Two isomers ofnitrochlorobenzene （o- andp-NCB） were treated by a Pd/Fe catalyst in aqueous solutions through catalytic amination and dechlorination. Nitrochlorobenzenes are rapidly converted to form chloroanilines （CAN） first through an amination process, and then rapidly dechlorinated to become aniline （AN） and CI^-, without the involvement of any other intermediate reaction products. The amination and dechlorination reaction are believed to take place predominantly on the surface site of the Pd/Fe catalysts. The dechlorination rate of the reductive degradation of the two isomers of nitrochlorobenzene （o-, and p-NCB） in the presence of Pd/Fe as a catalyst was measured experimentally. In all cases, the reaction rate constants were found to increase with the decrease in the Gibbs free energy （correlation with the activation energy） of NCBs formation; the activation energy of each dechlorination reaction was measured to be 95.83 and 77.05 kJ/mol, respectively for o- and p-NCB. The results demonstrated that p-NCBs were reduced more easily than o-NCBs.     

灵芝孢子粉对力竭小鼠抗氧化、抗损伤的作用

目的：探讨补充灵芝孢子粉对小鼠力竭游泳后肝脏抗氧化、抗损伤的作用。方法：建立灌服灵芝孢子粉小鼠力竭游泳实验模型,测定小鼠血清测谷丙转氨酶（CPT）、肌酸激酶（CK）活性,肝脏超氧化物歧化酶（SOD）、谷胱甘肽过氧化物酶（CSH—Px）活性、丙二醛含量（MDA）含量。结果：小鼠力竭运动后,三个给药小鼠血清CTP、CK活性均低于对照组,肝脏SOD、GSH—Px活性均高于对照组;其中与中剂量组均差异非常显著（P〈0．01）,与低剂量组差异显著或非常显著（P〈0．01或P〈0．05）,与高剂量组差异显著或无显著性差异（P〈0．05或P〉0．05）。结论：补充灵芝孢子粉可以增强机体抗氧化能力,减少肝脏细胞的损伤,另外补充灵芝孢子粉600mg／kg·d对小鼠抗氧化损伤作用效果较好。     

多媒体技术在体育教学中的应用

多媒体技术辅助传统体育教学已经越来越普遍,体育教师必须具备基本的信息素质,灵活运用多媒体技术教学手段,提高教学质量,这就需要我们正确认识多媒体技术与传统技术的关系,构建以多媒体辅助教学为核心的体育教学计划。     

论社会组织信息化中的信息技术外包管理

信息技术外包的管理是贯穿信息技术外包整个过程的重要内容。本文依据信息技术外包的整个过程——规划、组织和监理,分别论述了每个阶段的管理内容,包括信息技术外包的范围、方式、承包商的选择、监理的主体和内容等。     

维生素C,让皮肤健康起来

介绍了常见的皮肤问题;介绍了维生素C的性质用途以及在皮肤保养和美白中的作用,以及维生素C的合理补充.