复方氨基比林注射液的双波长薄层扫描分析研究

以苯-丙酮(4:1,V/V)为展开剂,在薄层硅胶板上将复方氨基比林注射液中的氨基比林和巴比妥分离后,通过双波长扫描测出氨基比林(λ_s=270nm,λ_R=300nm)和巴比妥(λ_s=205nm,λ_R=320nm)的含量.     

高效薄层色谱测定中成药中苦参碱

建立用高效薄层色谱法测定博性康速溶膜中苦参碱含量的方法。以苯 -丙酮 -乙酸乙酯 -浓氨试液 (2∶3∶4∶0 2 )为展开剂 ,扫描波长λS=480nm ,λR=6 5 0nm。结果显示 :苦参碱进样量 1～ 5 μg范围内呈良好的线性关系 ,r =0 9996 ,平均回收率为 99 4%,RSD =2 0 9%(n =6 )。     

仙方玉容膏中黄芪甲苷含量的测定

目的:建立仙方玉容膏中黄芪甲苷含量的高效薄层色谱测定方法。方法:以氯仿-甲醇-水(13∶6∶2)为展开剂,扫描波长λS=530nm,λR=700nm。结果:线性范围0 25～4ug,回收率97 6～103 4%,RSD2 84%(n=5)。结论:本法简便、灵敏、重线性好,可用于测定仙方玉容膏中黄芪甲苷含量和质量标准的控制。     

双波长薄层扫描法测定解热止痛散中对乙酰氨基酚和咖啡因的含量

在Cs- 930薄层扫描仪上以紫外反射吸收方式 ,灵敏快速测定了解热止痛散中对乙酰氨基酚和咖啡因的含量 .扫描参数 :对乙酰氨基酚λs=2 4 8.5nm ,λR=34 0 .0nm ,咖啡因λs=2 73.0nm ,λR=34 0 .0nm ,散射参数Sx=3.采用双波长反射线齿型扫描 ,狭缝 1.2mm× 1.2mm ,所用薄层板为GF2 54,薄层厚度 0 .4mm ,展开剂为氯仿 :甲醇∶醋酸乙酯∶冰醋酸 =10∶2∶2∶0 .2 (体积比 ) ,平均回收率对乙酰氨基酚为 95.6% ,咖啡因为 10 8.4 %     

薄层色谱法分离测定1,5-苯并硫氮杂α-氨基-β-内酰胺

用薄层色谱法分离测定了反应混合物中的 1 ,5-苯并硫氮杂 艹卓-α-氨基 -β-内酰胺 .扫描条件为 :λ1 =2 80 nm,λ2 =3 54nm,狭缝 1 .2 mm× 1 .2 mm,SX=3 .校准曲线的线性范围是 0 .2 75～ 7.70 μg( γ=0 .990 5,n=9) ,最低检出限为 0 .1 4 0μg.方法的变异系数小于 5% ,平均回收率为 1 0 0 .1 5% ,方法简便、快速     

知母中菝葜皂甙元测定方法探讨

建立用高效薄层色谱快速测定知母药材中菝葜皂甙元的方法。药材用苯和20%盐酸共同回流提取,以苯-丙酮(9:1)为展开剂,扫描波长λS=445nm,λR=600nm。结果显示:菝葜皂甙元在0 5～4μg范围内呈良好的线性关系,r=0 9991,平均回收率为98 7%。RSD=2 45%(n=5)。     

薄层扫描法测定强骨颗粒中黄芪甲苷的含量

采用双波长薄层扫描法,以氯仿—甲醇—水(13∶7∶2)的下层溶液为展开剂,10%硫酸乙醇溶液显色,在105℃烘约5 min,λS=530 nm,λR=700 nm条件下扫描,以测定强骨颗粒中黄芪甲苷含量.结果表明:样品中黄芪甲苷分离完全,阴性供试品无干扰,黄芪甲苷在1.982~9.91μg范围内呈良好线性关系,r=0.9957,平均回收率为98.4%,RSD为2.1%,测得3批强骨颗粒中黄芪甲苷的平均含量为0.0639 mg/g.     

麻黄水煎液及其泡沫中麻黄碱与伪麻黄碱的含量比较研究

目的:测定麻黄水煎液及其泡沫中麻黄碱、伪麻黄碱含量。方法:采用RP-HPLC法测定。Diamonsil-C18(250mm*4.6 mm,5um);乙腈-0.2%磷酸水溶液(4:96)洗脱,流速1.0 mL/min,检测波长210nm。结果:盐酸麻黄碱的回归方程为:Y=34195X-331.2,r=0.9998,在61.5~307.5mg.L-1范围线性关系良好;盐酸伪麻黄碱y=31131X-59.3,r=0.9996,在40.5~324 mg.L-1范围内线性良好。结论:麻黄水煎液及其泡沫中麻黄碱、伪麻黄碱含量基本一致。     

薄层色谱法分离测定1,5—苯并硫氮杂Zhuoα—氨基—？…

用薄层色谱法分离测定了反应混合物中的1,5-苯并硫氮杂_-α-氨基-β-内酰胺．扫描条件为：λ1＝280nm,λ2=354nm,狭缝l.2mm×1.21mm,SX=3．校准曲线的线性范围是0.275～7.70μg(γ=0.990 5,n＝9),最低检出限为0.140μg．方法的变异系数小于5％,平均回收率为100.15％,方法简便、快速．     

化学物质衍生-同步荧光法测定注射液中γ-氨基丁酸的含量

采用化学物质衍生结合同步荧光法,建立一种检测注射液中γ-氨基丁酸含量的方法.对γ-氨基丁酸的衍生产物进行同步荧光扫描,考察了影响体系荧光强度的因素.最佳实验条件为:8.0×10-3 mol/L硼砂缓冲液(pH=9.6),1.0×10-5 mol/L邻苯二甲醛-2.86×10-5 mol/Lβ-巯基乙醇组合试剂为衍生试剂,衍生时间60min,激发光、发射光通带宽度为5.0nm,λem=455.0nm,Δλ=120.0nm,检测液温度小于25℃.结果表明:在上述条件下获得的同步荧光光谱峰形最好,荧光强度最大.γ-氨基丁酸的线性范围为2.50～50.00μg/L,相关系数为0.999 0,检测限为0.79μg/L.本方法灵敏度高,操作简便,成本低,可用于注射液中γ-氨基丁酸含量的检测.     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has