二氯磷酰胆碱的合成及分析方法研究

目的 合成可用于生物材料表面改性的活性中间体二氯磷酰胆碱.方法 由三氯氧磷和氯化胆碱在无水条件下用非均相一步法合成二氯磷酰胆碱,并对合成条件进行了探讨,对产物进行了表征和含量测定.结果 产物结构由31P NMR和IR得到证明,产物含量用改进的电位滴定法进行了测定.在最佳反应条件下,收率可以达到100%,目标产物含量可达91%.结论 非均相一步合成二氯磷酰胆碱的方法 可行,改进的电位滴定法适用于磷酸酯/盐混合体系的组分分析.对于提高目标产物的产率及改进合成条件均有指导意义.     

均匀设计和偏最小二乘方法在一步合成μ-氧代双铁卟啉中的应用

报道了一种以芳基卟吩和铁盐为原料大批量合成μ-氧代双铁卟啉的一步合成新方法,并以对氯四苯基卟吩Tp-ClPPH2和FeCl2·4H2O合成μ-氧代对氯四苯基双铁卟啉(Tp-ClPPFe)2O为例,采用均匀设计并结合偏最小二乘方法优化了(Tp-ClPPFe)2O的合成条件.当DMF为35 mL,FeCl2·4H2O用量为0.3 g,加入FeCl2·4H2O后反应20 min,NaOH用量为0.35 g,加入NaOH后反应30 min,可获得94.08%的(Tp-ClPPFe)2O.偏最小二乘回归结果表明,在考察范围内,反应条件对反应影响的大小为FeCl2·4H2O用量＞加入FeCl2·4H2O反应时间＞NaOH用量＞加入NaOH后反应时间＞Tp-ClPPH2浓度.     

环氧树脂丙烯酸脂化反应催化体系研究

通过研究不同催化剂对EA(环氧丙烯酸)合成的影响,提出了将性能较好的2种催化剂复配用于EA合成的概念,并研究了复配催化剂及用量对EA合成的影响. 结果表明几种用于EA合成的催化剂的活性次序为:N,N-二甲基乙醇胺＞N,N-二甲基甲酰胺＞三乙胺＞三乙醇胺,并且当N,N-二甲基乙醇胺与N,N-二甲基甲酰胺配比为1∶ 1、用量为1.0%时,复合催化剂对EA合成表现出良好的催化和产品性能.     

46种植物提取物对柑橘红蜘蛛的杀螨活性

室内测定了采自桂东北46种植物的54种甲醇提取物对柑橘红蜘蛛的杀螨活性.结果表明:银杏等19种植物的活性高,24 h校正死亡率大于90%;狭叶十大功劳等15种植物的活性中等,校正死亡率为60%～90%;其余植物提取物的校正死亡率在60%以下.进一步测定了8种植物提取物对柑橘红蜘蛛的触杀毒力,表明:银杏对柑橘红蜘蛛的毒力最高,LC50值为1.924 8 g/L.8种植物提取物对试虫的毒力顺序为:银杏＞黄柏＞广西地不容＞厚果鸡血藤＞扛板归＞常山＞江南星蕨＞鱼腥草.     

新显色剂APSABT的合成及其与汞(Ⅱ)显色反应的研究

研究了1(4安替比林)3(2乙酰巯基苯基)三氮烯(APSABT)的合成方法及其与汞(Ⅱ)的显色反应.建立了一种高灵敏度、高选择性的汞的分光光度法,该方法可直接用于地表水和废水中微量汞的测定,其加入回收率为96.4%～103.8%,相对标准偏差为1.9%～2.9%,所得结果与冷原子吸收法一致.     

交联木聚糖制备工艺的优化和活性检测研究

交联木聚糖RBB-xylan是木聚糖酶在测定和筛选过程中常用的人工合成的色原底物,利用木聚糖和雷玛唑亮蓝制备RBB-xylan的传统方法得率较低.在传统方法的基础上采用改变单一变量对原有的实验方法逐步改进:将硫酸钠的滴加流速调整为0.8 m L/s,增加1 h陈化时间,将沉淀剂乙醇的用量提高3倍,从而使RBB-xylan得率从原来的50.5%提高到84.8%,效果显著.将RBB-xylan添加到平板可快速筛选出产木聚糖酶的菌株.结果表明,合成的RBB-xylan具有活性,可用于后续木聚糖酶的筛选及活性测定.     

荧光分光光度法测定生药厚朴中的厚朴酚与和厚朴酚

建立了同时测定生药厚朴中厚朴酚与和厚朴酚的荧光测定方法.液液萃取分离可基本消除样品提取液中共存杂质对测定的影响,通过选取适当的光谱校正点可扣除厚朴酚与和厚朴酚的光谱干扰和背景干扰.方法用于生药厚朴中厚朴酚与和厚朴酚的测定,5次测定相对标准偏差分别为厚朴酚3.97%及和厚朴酚2.67%,回收率为厚朴酚102.67%及和厚朴酚101.43%.     

原子吸收法测定三叶木通果皮中锌铅铬含量

用浓硝酸-高氯酸微波消解三叶木通果皮,用原子吸收分光光度法测定果皮中锌、铅和铬的含量.实验结果表明,锌、铅、铬3种重金属质量分数大小顺序为w（Zn）＞w（Pb）＞w（Cr）,其值分别为9.084×10^-3%,6.868×10^-3%,3.241×10^-3%,加标回收率分别为100.24%,99.87%,101.01%,相对标准偏差（RSD）分别为1.23%,1.22%,1.91%.该方法用于测定三叶木通果皮中锌铅铬含量,测定结果的准确度和回收率高,精密度和重复性好,具有良好的应用价值.     

对甲氧基苯甲醛为荧光探针测定DNA含量

基于DNA与对甲氧基苯甲醛的荧光猝灭效应,以甲氧基苯甲醛作为荧光探针建立了一种简便快速测定DNA的荧光分析方法.考察了pH、荧光探针浓度、温度、放置时间等条件对荧光探针及DNA测定的影响.该方法测定DNA含量的线性范围为51~1 000 ng/mL,检出限为30 ng/mL,10次测量500 ng/mL DNA的相对标准偏差为2.0%,可用于合成样品的测定.     

液-液分配高效液相色谱法测定饮料中合成色素的研究

建立了对饮料中合成色素的液-液分配法提取,高效液相色谱法测定的分析方法。合成色素用5%正辛胺正丁醇提取,VarianMicrosorb—MV100—5C18柱分离。加标回收率为99.3%～100.7%,与GB/T5009.35聚酰胺吸附法比较相对偏差小于2%。方法简便,快速,用于饮料中合成色素的测定结果满意。     

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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