HPLC法检测发酵液中的木糖和木糖醇

建立高效液相色谱检测发酵液中木糖和木糖醇含量的分析方法．色谱柱为ZORBAX碳水化合物，柱温30℃，流动相为乙腈：水=80：20（V／V），流速1．2mL／min，示差折光检测器检测．木糖和木糖醇在 0．5～40．0mg／mL范围内浓度与峰面积线性关系良好（R2分别为0．9931和0．9947），平均回收率分别为99．80％（n=5，RSD=1.35％）和99．62％（n=5，RSD=1．65％）．方法简便、快速、准确。     

中药材中西维因残留量的薄层色谱法测定

本文研究了中药材西维因残留量的薄层色谱-荧光测定．采用环已烷：丙酮：氯仿=5：1：1(V/V)作为展开剂，直接用荧光测定．本法灵敏度高，且易操作，当添加水平为0．01mg／mL时，回收率在84％-111％之间，线性相关系数为0．9998，检测限达到10ng．     

反相高效液相色谱法同时测定4种苯二氮Chuo类药物

提出了一种反相高效液相色谱法同时测定4种苯二氮Chuo类药物的分析方法。考察了4种苯二氮Chuo类药物的保留值与流动相组成、流速、pH及柱温等色谱条件的关系，优化了色谱条件．确定了以ODS Hypersil为色谱柱，甲醇-水(5l：49；V／V，用氨水调pH7．8)为流动相，流速为0．8mL／min，柱温为45℃，检测波长为220nm的最佳色谱条件,甲苯作为内标物，以内标法峰面积定量,硝西泮，地西泮，三唑仑和艾司唑仑线性范围分别是0．1mg／L～320mg／L，0．2mg／L～320mg／L，0．1mg／L～320mg／L和0．08mg／L～320mg／L．检测限分别为0．1mg／L，0．2mg／L，0．1mg／L和0．08mg／L,该方法用于尿液中的苯二氮革类药物的测定,其回收率为97．0％～108．7％，标准偏差为1．7％～3．0％(n=7),该方法简单、快速、精确、灵敏、重复性好。     

用柱后衍生荧光测定法检测食品中土霉素和四环素残留

应用高效液相色谱(HPLC)对动物性食品中土霉素(OTC)和四环素(TC)进行测定，样品经含乙二胺四乙酸二钠的丁二酸钠缓冲液除蛋白后，由SPE-C18小柱提纯净化，经ODS-C18柱分离后，用8％氧氯化锆溶液柱后衍生，与锆离子的螯合物在激发波长(Ex)：406nm和发射波长(Em)：515nm处检测。实验优化了锆试剂的浓度和柱后衍生的条件，提高了栓出的灵敏度，土霉素和四环素的回收率分别为89．59％和92．59％，变异系数(CV)分别为4．98％和6．74％。土霉素和四环素的最低栓出浓度(信噪比5：1)分别为3μg/L和5μg/L，线性范围为0．01～10μg/L，土霉素和四环素的相关系数分别为0．9999和1．0000。     

锌镀层表面杂多酸盐彩色配合物膜的XPS和AES研究

在锌镀层表面，磷钼矾和铈硅钨三元杂多酸(盐)具有较好的配位成膜能力，获得多种具有金属光泽的不溶性彩色配合物膜，膜层有良好的耐蚀性能和装饰效果。加速腐蚀试验结果表明，Na6(PMo9V30Oo）xHzO和K15[Ce(HSiW9O34)2]．xH2O与锌镀层反应时，形成两种新型的杂多酸盐金黄色配合物膜耐蚀性最佳。XPS和AES分析表明，Na6[(PMo9V3O40]．xH2O膜层中钼在膜表面的价态为 6，而在膜内层则以 6、 4价共存，其它元素的价态分别为：Zn( 2)、P( 5)、V( 5)，从其AES深度剥蚀曲线的组成恒定区求得膜的组成为：Zn 19．7％，Mo 29．3％，V21.2％，P16．1％，O 13．5％，膜层的厚度为160nm。K15[Ce(HSiW9O34)2],xH2O膜层中元素的价态分别为：Zn( 2)、Ce( 4)、Si( 4)、w( 6)，组成为：Zn11．3％，Ce13．7％，Si 21．5％，W 26．9％，O 28．8％，膜厚230nm。     

TLCS法测定二陈丸中的β-谷甾醇

采用薄层扫描法测定了二陈丸中β-谷甾醇的含量．样品经提取点于硅胶GF254薄层板上，以V(甲苯)：V(乙酸乙酯)=4：1为展开剂，用质量分数5％硫酸乙醇溶液显色，85℃烘干定位，检测波长501nm。结果是平均加样回收率为100．6％(n=5)，RSD为2．8％。该方法可用于二陈丸的质量控制。     

RP-HPLC法同时测定延胡索药材中延胡索乙素和原阿片碱

建立了反相高效液相色谱(RP-HPLC)法同时测定延胡索药材中延胡索乙素与原阿片碱含量的方法，并对不同产地延胡索药材中延胡索乙素与原阿片碱含量进行了考察．结果表明，使用Phenomenex Luna C18色谱柱，甲醇一磷酸盐缓冲溶液(pH=7．68，V：V=65：35)流动相，在检测波长281nm下，测定延胡索乙素与原阿片碱的线性范围分别为0．13～4．68μg和0．09～3．24μg，平均回收率分别为101．86％和98．13％，RSD分别为1．42％和1．36％．结果表明，此法简便、准确、快速，可用于药材中延胡索乙素与原阿片碱含量的测定，也可用于含这两种生物碱的药材的质量评价；两种生物碱含量在不同产地及来源延胡索药材中有较大差别．     

HPLC-DAD法测定补肾壮骨胶囊中紫丁香苷的质量比

为控制补肾壮骨胶囊中紫丁香苷的质量比,采用反相高效液相色谱方法,以Symmetry C18为色谱柱,V甲醇：V0.2％冰醋酸水溶液=55：45为流动相,流速1mL／min,柱温：30℃,二极管阵列检测器,提取波长为265nm,测得补肾壮骨胶囊中紫丁香苷的质量比为1．46mg／g,平均回收率为98．25％,结果表明,该方法简便、准确、重现性好,适用于补肾壮骨胶囊的质量控制．     

H2O2-有机酸降低汽油中烯烃含量研究

用H2O2(w=30％)对含烯烃的模拟油品进行氧化，探讨了各种催化剂对氧化反应的影响。结果表明，酸碱催化剂都可促进H2O2氧化反应的进行，对降低油品中烯烃效果，有机酸条件明显好于碱性和中性条件，甲酸的催化效果优于乙酸。在H2O2甲酸氧化降烯烃的过程中，当3种样品的体积比即V(模拟油品)：V(H2O2)：V(甲酸)=4：1：1，反应温度45℃，反应时间1h时，模拟体系中烯烃降低率为35．8％，流化催化裂化汽油中烯烃降低率达22．1％。     

白阿魏菇菌丝体多糖分离纯化工艺的优化和结构分析

对白阿魏菇菌丝体多糖的提取和纯化进行了优化设计，粗多糖经DEAE—cellulose及SephadexG-100柱层析，纯化得纯多糖(PNMP)，该多糖经聚丙烯酰胺凝胶电泳，SephadexG-100柱层析和紫外光谱分析鉴定纯度；通过红外光谱，气相色谱对PNMP进行组分分析；再用高碘酸氧化，Smith降解和测硫酸基法来鉴定其化学结构．结果表明，白阿魏菇菌丝体多糖提取最佳工艺为，用水浸提3h，pH7．O，温度90℃，搅拌，料水比为1／15，浸提2次，醇析浓度70％；蛋白质去除中，V氯仿：V正丁醇=2：V样品：V氯仿-正丁醇=2：1，萃取时间为40min，得粗多糖CPNMP，纯度为59．2％；在结构分析中，纯多糖(PNMP)纯度为83．22％，硫酸基含量为7．5％；该多糖至少由半乳糖、甘露糖、葡萄糖、阿拉伯糖等组成，糖苷键连接方式为1→3，1→6。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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