壮药香艾纳的化学成分研究

采用硅胶柱层析方法,对壮药香艾纳95％乙醇提取物的化学成分进行研究,共分离得到7个化合物,根据其理化性质和波谱学数据进行结构鉴定,结果表明分离得到的7个化合物分别为β-谷甾醇(Ⅰ)、豆甾醇(Ⅱ)、β-胡萝卜苷(Ⅲ)、咖啡酸(Ⅳ)、没食子酸(Ⅴ)、槲皮素(Ⅵ)、木犀草素(Ⅶ),其中豆甾醇、β-胡萝卜苷、咖啡酸、没食子酸为首次在该植物中分离得到.     

银叶巴豆的化学成分研究

 对产自云南思茅银叶巴豆(Croton cascarilloides)的化学成分进行了研究.利用反复硅胶柱层析、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结构,它们是3个二萜,2个芳香类化合物,1个黄酮苷和β-谷甾醇及β-胡萝卜苷.     

大叶钩藤化学成分的研究

大叶钩藤(Uncaria macrophylla Wall)枝干用甲醇提取,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8个化合物.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:熊果酸(1)、齐墩果酸(2)、羽扇豆烯酮(3)、β-谷甾醇(4)、胡萝卜苷(5)、表儿茶素(6)、东莨菪素(7)和3,4-二羟基苯甲酸乙酯(8).     

灯台树化学成分研究

灯台树(Bothrocaryum controversum)枝叶用甲醇提取,利用硅胶柱层析,Sephadex LH-20柱层析进行化学成分分离纯化,从中分离得到8个化合物。根据波谱分析和理化性质对化合物结构进行鉴定,鉴定结构为:槲皮素(1)、樱黄素(2)、黄颜木素(3)、表儿茶素(4)、obtusol(5)、羽扇豆醇乙酸酯(6)、β-谷甾醇(7)和胡萝卜苷(8)。所有化合物都是首次从该植物中分离得到。     

麻花秦艽化学成分的研究

通过硅胶柱层析及薄层层析方法对甘肃产麻花秦艽(Gentiana straminea Maxim)根醇提物进行分离,得到7个化合物,应用核磁共振等光谱方法及与对照品对照鉴定结构分别为龙胆苦苷(gentiopicroside,Ⅰ),熊果酸(ursolic acid,Ⅱ),胡萝卜苷(β-sitoseteryl-3-O-β-D-glucopyranoside, Ⅲ),β-D-葡萄糖乙苷(ethyl-β-D-glucopyranoside, Ⅳ),N-正二十五烷-2-羧基苯甲酰胺(N-pentacosy-2-carboxy-benzoylamide,Ⅴ),乌苏醇(uvaol,Ⅵ)和2'-(邻,间-二羟苯甲酰)獐牙菜苷(2'-(o,m-phenylglycin)sweroside,Ⅶ)。其中化合物Ⅳ为从该属中首次分离得到的化合物,化合物Ⅴ,Ⅵ和Ⅶ为该植物中分离得到的化合物。     

竹节草的化学成分研究

以乙醇提取,硅胶柱层析分离和波谱方法鉴定结构,从竹节草地上部分分离鉴定出5个化合物:3β-羟基-5,α8α-桥二氧麦角甾-6,22-二烯(Ⅰ)、槲皮素(Ⅱ)、3-O-β-D-吡喃葡萄糖(6→1)-α-L-鼠李糖槲皮素(Ⅲ)、胡萝卜苷(Ⅳ)、po insettifo lin A 3-O-[3′″″-乙酰基-α-L-吡喃阿拉伯糖基-(1′″″→6″″)]-β-D-吡喃葡萄糖苷(Ⅴ).其中化合物Ⅴ为新化合物,化合物Ⅰ和Ⅲ系首次从该属植物中分离得到.     

安顺产半夏化学成分的研究

本文对半夏化学成分进行研究.采用乙醇溶剂提取和硅胶柱层析分离,经过光谱分析鉴定其结构.分离,鉴定了7个化合物,分别为β-谷甾醇(Ⅰ)、胡萝卜苷(Ⅱ)、琥珀酸(Ⅲ)、4-氨基丁酸(Ⅳ)、丙氨酸(Ⅴ)、棕榈酸(Ⅵ)、棕榈酰胺(Ⅶ).其中Ⅳ、Ⅴ、Ⅶ首次从该植物中分离得到.     

山颠茄根药物成分分析

目的:研究山颠茄根石油醚部位和醋酸乙酯部位的化学成分。方法:采用硅胶柱层析进行分离纯化,根据理化性质和波谱学数据进行结构鉴定。结果:从山颠茄根石油醚部位分到3个化合物,分别为二十八烷酸、二十烷酸和β谷甾醇;从醋酸乙酯部位得到对羟基苯甲酸和β胡萝卜苷。结论:二十八烷酸、二十烷酸、对羟基苯甲酸和β胡萝卜苷均为首次在该植物中分离得到。     

兴安杜鹃叶化学成分研究

运用硅胶柱层析和HPLC等色谱方法对内蒙古阿尔山市产兴安杜鹃叶的化学成分进行研究,分离得到了6个单体化合物。通过NMR等波谱技术进行结构鉴定,确定这些化合物的结构分别为:吉玛酮(1),灰叶酸(2),β-谷甾醇(3),二十八烷醇(4),胡萝卜苷(5),齐墩果酸(6),其中4,5为首次从该植物中分离得到。     

排风藤中化学成分的分离与鉴定

利用溶剂提取法、正相和反相硅胶柱层析、Sephadex LH-20、RP-HPLC等色谱方法,从排风藤95%乙醇提取物中分离得到6个化合物.通过理化性质和1 H NMR、13 C NMR等光谱数据鉴定化合物的结构为β-谷甾醇(1),β-胡萝卜苷(2),N-反式-香豆酰酪胺(3),N-反式-对羟基苯乙基阿魏酰胺(4),N-反式阿魏酰基-3-甲氧基酪胺(5),N-trans-feruloylo-ctopamine(6).其中化合物2～6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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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