健身者营养补充剂的选择

我们应该知道营养补充剂并不是万能的．只有正确地使用才可以起到理想的作用又不会危害人的健康。经常运动的人比一般人消耗更多的体力．因此在合理的饮食之余．服用营养补充剂来补充营养．缓解体力的疲劳显得十分重耍。面对形形色色层出不穷的营养补充剂．如何进行选择？资深营养补充剂营养专家加里何汉为热爱运动的人们推荐了5种可信的营养补充剂。同时也揭穿了5种营养补充剂在宣传上的谎言。我们跟随他起来了解：[编者按]     

Determination of protoberberine alkaloids in Coptidis Rhizoma by novel extraction and high-performance liquid chromatography

An alternative, effective, and solvent-free microextraction method has been developed using weighing paper as the adsorbent for five protoberberine alkaloids from the methanolic extract of Coptidis Rhizoma (C. Rhizoma). Several variables influencing extraction efficiency were optimized. 1.0?×?1.0?cm glassine weighing paper was employed for the isolation of the analytes followed by high-performance liquid chromatography. Under the optimum conditions, the limits of detection were between 0.2 and 0.4?ng/mL with enrichment factors from 41–47. The calibration curves were linear across the concentration ranges examined with correlation coefficients exceeding 0.992. All relative standard deviations were less than 10.0%. The method was employed for the determination of the analytes in C. Rhizoma. Berberine, palmatine, coptisine, epiberberine, and jatrorrhizine were present at concentrations between 9.62?±?0.87?mg/g and 0.48?±?0.05?mg/g.     

臭氧对糖蜜酒精废液脱色效果的研究

通过对臭氧流量、废液pH值、反应温度、氧化时间 4个因素的实验摸索 ,得出采用臭氧氧化法处理酒精废液单因素影响的基本规律。以最佳条件组合 :流量 0 10m3 /h ,pH9 0 ,时间 90min做优化实验 ,脱色率为 5 6 92 %。     

卵黄高磷蛋白调控生物矿化的研究进展

近年来研究发现磷酸化蛋白质在生物矿化过程中起着重要的作用,而卵黄高磷蛋白是目前自然界中磷酸化程度最高的蛋白质之一,已有部分研究证明了卵黄高磷蛋白具有矿化调节作用,但关于它调控矿化的活性位点及具体机制还不明确。本文概述了生物矿化发生的环境、矿化原理、矿化过程及矿化调控等内容,对卵黄高磷蛋白调控生物矿化的相关假说及研究进展进行了探讨。     

1Z750—2型牛蒡整地机的设计研究

在大量试验和系统分析了牛蒡收获机工作部件的基础上,进行了理论设计和计算,研制出1Z750-2型牛蒡整地机.试验表明,该机具设计合理,能够完成牛蒡的整地作业,性能可靠,操作简单方便,达到农业技术工艺要求,居于国内同行业领先水平.     

基于委托—代理博弈理论的建筑施工项目经理道德风险模型研究

由于信息不对称和监督约束机制不健全等原因,而且根据“理性人”假设,项目经理为追求自身利益最大化往往倾向于做出有利于自身利益的决策,而这一目标可能和企业利润最大化的目标不一致。文章运用不确定性互不可监督的委托-代理博弈理论研究建筑施工企业项目经理的道德风险模型。     

高镁炉渣性能研究进展

简要介绍高镁炉渣性能研究现状与进展及该研究对冶金生产过程的重要性,并指出今后研究的方向。     

Prospect of HDR geothermal energy exploitation in Yangbajing,Tibet,China,and experimental investigation of granite under high temperature and high pressure

Hot dry rock(HDR) geothermal energy,almost inexhaustible green energy,was first put forward in the 1970s.The development and testing of HDR geothermal energy are well reported in USA,Japan,UK,France and other countries or regions.In this paper,the geological characters of Yangbajing basin were first analyzed,including the continental dynamic environments to form HDR geothermal fields in Tibet,the tectonic characteristics of south slope of Nyainqêntanglha and Dangxiong-Yangbajing basin,and the in-situ stress...