Role of active oxygen species in diethyldithiocarbamate-induced gastric ulcer in the rat

Summary Diethyldithiocarbamate, an inhibitor of Cu,Zn-superoxide dismutase, was recently found to be ulcerogenic in the rat stomach, and active oxygen species were found to be responsible for its ulcerogenicity. To clarify which active oxygen species play a role in ulcerogenesis, the effects of various scavengers and iron-chelators were studied. As superoxide dismutase and catalase reduced the ulcerogenesis induced by diethyldithiocarbamate, the superoxide radical and hydrogen peroxide were considered to play a pathogenic role in this ulcer model.     

(RNCS_2)_2的晶体与分子结构(R:Et_2,cyclo-C_5H_(10))

在制备含双硫配体三价稀土离子配合物的醇类溶渣中分离出通式为(RNCS_2)_2的二聚物,应用ENRAF-NONIUS CAD-4四圆衍射仪收集衍射数据进行结构分析,结果表明,两化合物结构单元里的两个RNCS_2单位具有完全相似的键合方式。     

四元螯环配合物氨荒酸盐法同时测定银和铜

利用二乙氨基二硫代甲酸盐萃取光度法，同时测定了铜和银，根据四元螯环稳定顺序置换反应，使方法具有非常好的选择性；配合富集技术的应用，提高了方法的灵敏度，最低检测浓度为５．２×１０￣（－６）ｇ／Ｌ的铜和４．８×１０￣（－６）ｇ／Ｌ银。