石松生物碱和三萜成分的分离与鉴定

云南宣威产石松(Lycopodium japonicum)干燥全草用甲醇提取,利用硅胶柱层析和Sephadex LH-20柱层析进行化学成分分离纯化,从中分离得到12个生物碱和3个三萜化合物,根据现代波谱技术和理化性质对化合物结构进行鉴定,鉴定结构为:lycodoline(1),acetyllycoposerramine M(2),lycoposerramine-M(3),6α-hydroxylycopodine(4),12-epilycodoline(5),12β-hydroxy-acetylfawcettiine(6),lucidioline(7),α-obscurine(8),des-N-methyl-α-obscurine(9),lycopoclavamine-A(10),fawcettimine(11),lycoflexine N-oxide(12),α-onocerin(13),26-nor-8-oxo-α-onocerin(14)和diepiserratenediol(15).化合物4、5、12和15为首次从石松中分离得到.     

蛇足石杉化学成分的研究

从云南屏边产石杉科植物蛇足石杉(Huperzia serrata(Thunb.)Trev.)中通过溶剂提取、硅胶柱层析、Sephadex LH-20柱层析和制备薄层层析等方法分得11个化合物,包括6个生物碱、3个三萜和2个甾体。波谱分析(核磁共振氢谱、碳谱和质谱)确定它们的结构分别为石杉碱甲(1),石杉碱乙(2),石杉碱庚(3),马尾杉碱乙(4),8β-羟基马尾杉碱乙(5),lycoposerramine D(6),serratenediol(7),21-epi-serratenediol(8),serratenediol-3-acetate(9),β-谷甾醇(10)和胡萝卜甙(11),均为首次从云南产蛇足石杉中分离得到。     

云南产玫瑰花化学成分研究

从云南产玫瑰花干花瓣经甲醇提取,硅胶柱层析,高效液相色谱分离提纯得到6个化合物,通过波谱方法分别鉴定为山奈酚-7-O-β-D-半孔糖皮蒽(1),山奈酚(2),槲皮黄酮(3),黄杉素-4'-甲基醚(4),(-)-表儿茶素(5),二氢染料木素(6).其中化合物(2)、(3)、(5)、(6)为首次从该植物中分离得到.     

密花美登木叶化学成分研究

运用正相硅胶柱层析、MCI柱层析和半制备高效液相色谱分离了纯化密花美登木叶的化学成分,并采用NMR谱学和质谱技术鉴定了其结构.结果表明:从密花美登木叶中分离得到了5个化合物,分别鉴定为海棠果醇(1)、木栓酮(2)、山奈酚(3)、山奈苷(4)、胡萝卜苷(5),其中化合物2⁵为首次从该植物中分离得到.     

云南甜柿叶化学成分研究

运用多种柱层析手段对新鲜云南产日本甜柿叶甲醇提取物的化学成分进行研究,并借助于核磁共振、质谱等现代有机波谱学手段的方法,从中共分离并鉴定了7个化合物,分别为山奈酚-3-O-β-D-葡萄糖苷(1),山奈酚-3-O-β-D-半乳糖苷(2),槲皮素-3-O-β-D-葡萄糖苷(3),刺五加苷E(4),长寿花葡萄糖苷(5),熊果酸(6),齐墩果酸(7).其中化合物4和5为首次从柿属中分离得到.     

补骨脂化学成分的研究

从中药补骨脂(Psoraleacorylifolia)种子中通过溶剂提取、硅胶柱层析、SephadexLH-20柱层析和制备薄层层析等方法分得四个化合物。波谱分析(核磁共振氢谱、碳谱和质谱)确定它们的结构分别为补骨脂查耳酮(1,bavachalcone)、补骨脂色烯素(2,bavachromene)、松醇(3,pinitol)和对羟基苯甲醛(4,p-hydroxybenzaldehyde)。化合物3系首次从补骨脂中分得。     

北马兜铃化学成分的研究

从北马兜铃(Aristolochia contorta)种子中通过溶剂提取、硅胶柱层析、Sephadex LH-20柱层析和制备薄层层析等方法分得6个化合物。波谱分析(核磁共振氢谱、碳谱和质谱)确定它们的结构分别为马兜铃酸(aristolochic acids)IVa(1)、VII(2)，马兜铃内酰胺(aristolactam)-N-β-D-glucopyanoside(3)、aristoloctam Ia N-β-D-glucopyanoside(4)、松醇(pinitol，5)和葫萝卜苷(daucosterol，6)。化合物5系首次从北马兜铃中分得。     

翼梗五味子木脂素成份的分离与鉴定

从云南产翼梗五味子(Schisandra henryi)茎中通过溶剂提取和硅胶柱层析分离了4个木脂素成分,经波谱分析及与标准品对照鉴定它们的结构分别为异安五脂素(isoanwulignan,1)、benzoyl-gomisin Q(2)、五味子酯甲(schisantherin A,3)和gomisin G(4),均系首次自该植物中分得。     

异型南五味子的化学成分研究

 对产于云南绿春异型南五味子(Kadsura heteroclita(Roxb.)Craib)的化学成分进行研究.采用硅胶柱层析、重结晶等分离手段从中分离纯化得到8个化合物,通过现代波谱技术和理化常数测定鉴定了它们的结构,分别为kadsudilactone(1),长南酸(changnanicacid2),nigranoicacid(3),acetylaleuritolicacid(4),(+)-dihydrodehydrodiconiferylalcohol-9-O-β-D-glucopyranoside(5),isolariciresinol-9-O-β-D-xylopyr-anoside(6),β-谷甾醇(β-sitosterol7),胡萝卜苷(daucosterol8).化合物1,5和6为首次从该植物中分离得到,化合物5和6则首次从南五味子属植物中分离得到.     

狗牙花生物碱成分的研究

狗牙花(Ervatamia divaricata(L.)Burk.'Gouyahua')枝叶用丙酮提取,利用硅胶柱层析、Sephadex LH-20柱层析和反相柱层析进行化学成分分离纯化,从中分离得到6个吲哚生物碱。根据波谱技术和理化性质对化合物结构进行鉴定,鉴定结构为:coronaridine(1)、19-epi-heyneanine(2)、isovoacangine(3)、ibogamine(4)、19(S)-hydroxyibogamine(5)和apparicine(6),其中化合物2、3和5为首次从该植物中分离得到。     

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