车前草降血尿酸有效成分提取工艺的研究

建立小鼠急性高尿酸血症模型,通过灌胃给药考察车前草的降血尿酸作用.采用正交试验设计,以车前草所含大车前苷为指标,考察乙醇浓度、提取时间、提取次数和乙醇用量4种因素对提取结果的影响.大车前苷和血尿酸的含量均用HPLC法测定.结果表明,车前草醇提组的小鼠血清尿酸水平明显低于模型组(P0.05).乙醇浓度、提取时间、提取次数和乙醇用量4种因素对车前草乙醇提取物中的大车前苷含量均有显著影响.最佳提取工艺为用10倍药材量的60%乙醇提取2次,每次2 h.     

Kubelka—Munk模型下的人血管对632．8nm氦—氖激光的散射与吸收特性

本文测量了人动脉和静脉对He-Ne激光的反射和透射传输特性。实验采用两积分球系统及波长为632．8nm的He-Ne激光器,并根据测量数据及采用Kubelka-Munk模型分析和计算了人动脉和静脉组织对该波长激光的吸收系数、散射系统及总的光强I（x)及前向散射通量i(x)和后向散射通量j(x)的变化情况。结果表明,人动脉和静脉内外侧的漫反射率和透射率有明显差别,而且,动脉对激光的吸收系数明显较静脉的要小,而动脉对激光的散射系数却明显较静脉的要大,在动脉和静脉组织中总的光强I（x）及前向散射通量i(x)和后向散射通量j(x)的变化情况也有明显的区别。     

Kubelka-Munk模型下人血管对He-Ne激光的散射与吸收特性

测量了人动脉和静脉对He Ne激光的反射和透射传输特性。实验采用两积分球系统及波长为 6 32 8nm的He Ne激光器 ,并根据测量数据及采用Kubelka Munk模型分析和计算了人动脉和静脉组织对该波长激光的吸收系数、散射系数及总的光强I(x)及前向散射通量i(x)和后向散射通量 j(x)随厚度的变化情况。结果表明 ,人动脉和静脉的漫反射率和透射率有明显差别 ,而且 ,动脉对激光的吸收系数和散射系数明显较静脉的大 ,在动脉和静脉组织中I(x) ,i(x)和 j(x) 随厚度的变化情况也有明显的区别。     

Voltammetric Studies of the Interaction of Tris (1,10-phenanthroline) Cobalt (III) with Bovine Serum Albumin

Recently, the studies on the interaction of DNA with small molecules have been attracting much interest1-6. These researches not only gave the important information about thermodynamics and kinetics, but also can prompt the combination between the electrode substances and biomacromolecule with super catalysis and sensor character. It is of great significance in understanding energy conversion and metabolism in live body, biomolecular structure, various physical and chemical characters for e…     

支气管哮喘发作期血清部分微量元素的研究

对60例支气管哮喘发作患者血清中部分微量元素进行了观察,并同正常人群进行了对照。发现与正常人群有一定的差别。讨论了其原因。     

妊娠期糖尿病妇女血清中元素含量的变化

糖尿病与体内微量元素的不平衡密切相关。妇女在妊娠期中容易发生糖耐量异常和妊娠期糖尿病,因此研究这些孕妇血清中元素含量的变化,对弄清妊娠期糖尿病的机理和进行防治有重要意义。本工作测定了糖耐量异常和妊娠期糖尿病孕妇血清中硒、铜、锶、镁、锌、钙、磷、铁和铝等九种元素持含量,研究了其与正常孕妇的差异,并观察了元素含量与孕期的相关性。结果表明,糖耐量异常和妊娠期糖尿病孕妇血清中硒的含量与正常孕妇相比明显降低。妊娠期糖尿病孕妇血清中铜比正常孕妇显著升高,而锌有降低趋势,其它元素则未明显变化。此外,观察到正常孕妇和血清异常孕妇血清中硒和钙的含量都与孕期呈明显的负相关性。     

城市部分环境监测因子中铅含量的测定及与人体健康潜在关系的探讨

应用石墨炉原子吸收法测定了饮用水、地表水、酸雨、总悬浮颗粒物中铅的含量,并比较了饮用水源中可溶性铅与总铅的含量差别,探讨了以上各环境监因子中不同浓度水平的铅与人体健康的潜在关系。     

Progradation of the Changjiang River delta since the mid-Holocene

Subaqueous deltaic deposits with approximately 30 radiocarbon ages show that the Changjiang River delta was strongly affected by tides and that the delta progradation rate after 2 kaBP was almost double the rate before 2 kaBP. This change in the progradation rate correlates well with the active extension of the subaerial delta plain shown by previous work. Widespread human activities, such as farming, deforestation, and dike construction, probably resulted in an increase in sediment discharge to the river-mouth area.     

Effect of large-scale reservoir and river regulation/reclama-tion on saltwater intrusion in Qiantang Estuary

By using field salinity data recorded in the Qiantang Estuary for the nearly forty years (which covers the periods before and after the erection of a large-scale reservoir in the watershed and river regulation/reclamation in the estuary) and one-dimensional salt water intrusion modeling, it is shown that the salt water intrusion decreases caused by increased low water discharge for the reservoir, while the intrusion increases for the increased tidal range because of the river regulation/reclamation. The integrate result is that the saltwater intrusion decreases.     

血清中胆固醇的国际比对--CCQM-K6的IDMS法测量

介绍血清中胆固醇的同位素稀释质谱测定法,首次报道了国际物质量咨询委员会（CCQM）2000年组织的血清中胆固醇测定的关键比对－CCQM－K6的结果。