尾叶香茶菜中对映—贝壳杉烯型二萜

尾叶香茶菜中对映－贝壳杉烯型二萜王艳红１）陈耀祖２）孙汉董３）金东史４）（１）中山大学化学与化学工程学院，广州５１０２７５；２）浙江大学化学系；３）中国科学院昆明植物研究所植化室；４）朝鲜国家科学院植物研究所）关键词唇形科，香茶菜属，尾叶香茶菜，对...     

紫毛香茶菜中7,20—环氧—对映—贝壳杉烯型二萜

紫毛香茶菜中７，２０－环氧－对映－贝壳杉烯型二萜王艳红１）陈耀祖２）孙汉董３）林中文３）（１）中山大学化学与化学工程学院，广州５１０２７５；２）浙江大学化学系；３）中国科学院昆明植物研究所）关键词唇形科，香茶菜属，紫毛香茶菜，对映－贝壳杉烯，二萜分类...     

尾叶香茶菜二萜成份研究

从唇形和尾叶香茶菜叶子的甲醇提取物中，分离提取了４个对映－贝壳杉烯型二萜，并利用核磁共振氢谱和碳谱，以及质谱、红外光谱和紫外光谱等方法，对以上各化合物进行了结构鉴定。化合物１在该植物的文献中未见报道。     

狭基香茶菜化学成分的研究

从狭基香茶菜的叶和茎的乙醇提取物中分离得到７个化合物，应用波谱分析和元素分析等方法鉴定出３个化合物的化学结构，它们分别为金合欢烯、降胡萝卜素，羊毛甾醇乙酸酯．     

总序香茶菜和蓝萼香茶菜挥发油成分研究

利用气相色谱-质谱联用技术对总序香茶菜(RabdosiaRacemosa(Hemsl)Hara)和蓝萼香茶菜(Rabdosiajaponica(Burm f)Haravar.galaucocalyx(Maxin)Hara)挥发油化学成分进行了研究,分别鉴定出46种和40种组分,所鉴定化合物的相对含量分别占其全油的84 77%和73 5%.用气相色谱面积归一化法测定了各成分的相对百分含量,其主要成分为酯类、烷类等.     

螺旋藻水溶性多糖的分离纯化

螺旋藻干粉经乙醇脱脂后用水提取,乙醇沉淀,并经凝胶Ｓｅｐｈａｄｅｘ－Ｇ柱层析精制,获得４种螺旋藻制多糖ＳＰＡ－１,ＳＰＡ－２,ＳＰＡ－３,ＳＰＡ－４,研究表明均为均一多糖组分。     

灰岩香茶菜与淡黄香茶菜的生药学研究

目的:对云南两种香茶菜属植物灰岩香茶菜与淡黄香茶菜进行系统的生药学研究,为其鉴别及开发利用提供科学依据。方法:采用来源鉴定、性状鉴定、显微鉴定及理化鉴定的方法。结果:两种香茶菜属植物根的横切面及粉末显微特征有一定差异。结论:实验结果可为其生药鉴定、质量标准的制订和进一步开发利用提供理论依据。     

腺花香茶菜二萜成分研究

由腺花香茶菜全草的丙酮提取物中分离得到２个对映－贝壳杉烯型二萜,利用红外、紫外、质谱和核磁共振等光谱方法,对这２个化合物的结构进行了鉴定．其中的１个化合物灰岩香茶菜甲素首次从该植物中分离得到     

新香茶菜素的晶体结构和电子结构研究

新香茶菜素是从中草药显脉叶香茶菜中提取出来的一种天然有机二萜化合物,由Ｘ射线衍射测定结果可知,其晶体属单斜晶系,空间群为Ｐ２１,α＝０．６７７６（２）,ｂ＝１．４６４０（８）,ｃ＝１．１４１２（５）ｎｍ,β＝９５．７１°（３）,Ｚ＝２,晶体结果表明,分子中含有一个α－亚甲基环戊基乙酸酯和一个四氢γ－吡喃酮结构,这两种结果中与环直接链连的双键部分具有一定的内应力,是反应活性区。     

The Constituents of Diterpenoids from Isodon excisa

从唇形科尾叶香茶菜叶子的甲醇提取物中，分离提取了４个对映－贝壳杉烯型二萜，并利用核磁共振氢谱和碳谱，以及质谱、红外光谱和紫外光谱等方法，对以上各化合物进行了结构鉴定．化合物１在该植物的文献中未见报道．     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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