糖化血红蛋白的应用价值研究进展

糖化血红蛋白(HbA_(1C))是人体血液中红细胞内的血红蛋白与血糖结合的产物。属于不可逆反应过程,并与血糖浓度成正比,且保持3~4个月左右,所以可以检测到120天之前的血糖浓度~([1-2])。因此HbA_(1C)水平在一定程度上反映患者近8~12周的血糖水平。近年来,HbA_(1C)越来越受到国内外相关人士的重视,美国糖尿病协会(ADA)于2011

数值模拟二维高速碰撞问题的拉格朗日任意三角形网格有限体积法

描述了一个数值模拟二维高速碰撞问题的拉格朗日任意三角形网格有限体积法,方法考虑了材料的弹性和塑性性质.文中给出两个计算例题

高分散度铜基甲醇合成催化剂的研究

高分散度铜基甲醇合成催化剂的研究李基涛高利珍张伟德陈明树（厦门大学化学系物理化学研究所361005）70年来甲醇合成催化剂被广泛关注，特别是60年代后期英国ICI公司发明低温低压铜基甲醇合成催化剂以来，人们对铜基甲醇合成催化剂的制备与表征进行了深入地...国家自然科学基金;固体表面物理化学国家重点实验室资

Rapid determination of Fe,Ni,Mn,Cu,Zn,Pb in seawater by co-precipitation-centrifuge-X-ray fluorescence spectrometer

基于共沉淀的富集作用,采用自制的离心管离心沉淀,以手持式X-射线荧光仪(Xrf)测定,由此建立了表层海水中fE,nI,Mn,Cu,zn,Pb的共沉淀-离心-Xrf快速分析方法。测定时间为5 MIn/样;线性范围125μg/l~1 000μg/l,可以满足近岸表层海水中铁和锰的分析要求;基底加标200μg/l回收率为94.5%~116%;连续7次测定6种金属浓度均为500μg/l的海水加标样品,相对标准偏差(rSd)为2.86%~5.85%。与ICP-MS法比较,测定结果无显著性差异。本方法具有化学试剂污染小、方便快捷、可现场快速测定方法等优点。该方法已成功应用于厦门西港和福建九龙江河口表层海水中可溶态铁锰的现场测定,并在现场以手持式Xrf对颗粒物中铁锰进行了测定,获得了该海域颗粒物中和海水中铁锰的分布。Based on the enrichment of co-precipitation with a self-made centrifugal tube and detection with a portable X-ray fluorescence spectrometer(XRF),a rapid method for determination of iron(Fe),nickel(Ni),manganese(Mn),copper(Cu),zinc(Zn) and lead(Pb) in surface seawater was established.The analysis time was 5 min per sample.The linear range was 125 μg/L--1 000 μg/L,and it fulfilled the requirements for the analysis of iron and manganese in coastal surface seawater.The recoveries were between 94.5%--116% with a sample spiked at 200 μg/L;and the relative standard deviations(RSD) were 2.86% -- 5.85%(n=7) at 500 μg/L.Compared with the ICP-MS method,there was no significant difference between the determination results.The method has the advantages of being less contaminated from the chemical reagents,convenient and fast,and practicable in the field.The method was successfully applied in Xiamen western harbor and Jiulongjiang estuary in Fujian Province to measure dissolvable iron and manganese in surface seawater on boat.With the portable XRF,particulate iron and manganese were determined in field as well.The distributions of iron,manganese in particles and seawater were obtained.近海海洋环境科学国家重点实验室自主创新研究课题(MELRI1001

Classification of Panax Quinquefolium.L Samples by Cluster Analysis

建立西洋参药材分类方法;分别采用电感耦合等离子体质谱(ICP-MS)法、高效液相色谱(HPLC)法以及蒽酮-硫酸分光光度法,对12个西洋参样品中的15种无机元素、7种人参皂苷和多糖进行测定,用SPSS聚类分析法对12个西洋参样品进行聚类分析;结果表明:以4种不同的聚类变量进行聚类分析,其聚类分组结果并不一致,将几种有效成分综合为聚类变量,对西洋参进行分类更为科学合理;聚类分析法是西洋参分类分析的有效方法,对西洋参品种与质量的鉴定有一定的理论意义和实用价值。A classification method was developed for the quality assessment of Panax Quinquefolium.L.The contents of fifteen elements,seven ginsenosides and polysaccharide in twelve Panax Quinquefolium.L samples were determined by ICP-MS,HPLC and anthrone-sulfuric acid spectrophotometry,respectively.The cluster analysis was applied for the classification of 12 Panax Quinquefolium.L samples.The analysis results showed that the classified results were different with different cluster variables and it was found more reasonable to integrate several active components as cluster variables for the classification.The cluster analysis was useful for the classification of Panax Quinquefolium.L

雙吡啶硫酮的合成改進

以2-巰基吡啶-N-氧化物為原料,30%過氧化氫-尿素加合物為氧化劑合成了雙吡啶硫酮,最佳反應條件是:n(原料):n(氧化劑)=1:1.25,反應溫度45℃,反應時間1.75 h。粗產物用乙醇重結晶,純度為99.6%,收率為91.6%。并用元素分析、紅外光譜和氫核磁共振譜對產物的結構進行了表征。 At the molar ratio of 1:1.25 and the reaction temperature of 45°C, Dipyrithion was obtained through reacting 2-pyridinethiol-N-oxide with 30% hydrogen peroxide-urea adduct for 1.75 h. The yield and purity were 91.6% and 99.6% respectively. The structures were characterized by elementary analysis, IR and 1H NMR

试论社会变迁与理想信念教育

当今中国30多年的改革开放带来巨大的社会变迁,各种思潮和价值观念相互涤荡,对大学生的理想信念带来冲击和影响。积极主动地应对社会变迁带来的挑战,加强对大学生的理想信念教育,使大学生成为有社会主义理想信念的人是当前高校思想政治教育工作的任务。广西马克思主义理论研究和建设工程基地课题(项目批准号:09MJ017)的阶段性成

[[alternative]]以2008年環境觀察能力測驗為例

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