草玉梅抗肿瘤活性成分的分离与鉴定

对毛茛科银莲花属植物草玉梅(Anemone rivularis)根茎的乙醇[(乙醇)=95%]提取物采用四甲基偶氮唑盐比色(MTT)法进行抗肿瘤活性测试.活性筛选结果表明:草玉梅乙醇[(乙醇)=95%]提取物的石油醚萃取物(Ⅰ)、乙酸乙酯萃取物(Ⅱ)和正丁醇萃取物(Ⅲ)对人肝癌细胞株(QGY-7703)、人结肠癌细胞(COLO-205)和人肺癌细胞(A549)具有不同的抑制作用.经反复纯化制备化合物,从乙酸乙酯萃取物中分离出4个化合物,根据化合物的理化性质分析、波谱解析、对照品比较以及与文献报道对比,鉴定出化合物的化学结构分别为4-羟基苯甲酸(1)、3-羟基-4-甲氧基苯甲酸(2)、香豆酸(3)和咖啡酸(4).化合物1─4为从该属植物中首次分离得到.     

小叶冷水花化学成分的研究

采用硅胶色谱、Sephadex LH-20分子筛和RP-18反相硅胶色谱等技术,对小叶冷水花95%乙醇提取物的乙酸乙酯部位的化学成分进行分离纯化,并运用现代波谱技术(ESI,~1HNMR,~(13)CNMR)鉴定单体化合物结构.发现从其全草乙醇提取物的乙酸乙酯部位分离得到7个化合物,分别为:棕榈油酸(1),棕榈酸(2),乌苏酸(3),反式-植物醇(4),(-)-丁香烯氧化物(5),(+)-桉油烯醇(6),α-香树精(7).化合物1~7均为首次从该植物中分离得到.     

苍耳化学成分研究

研究苍耳Xanthium sibiricum Patrin ex Widder全草的化学成分。采用硅胶柱色谱、HPLC色谱等方法分离纯化,根据理化性质和波谱数据进行结构鉴定。从苍耳全草乙醇提取物中分离得到了7个化合物,分别鉴定为:羽扇豆醇乙酸酯(1),异香草酸(2),咖啡酸(3),β-谷甾醇(4),麦角甾醇(5),三十烷醇(6),蒲公英甾醇乙酸酯(7)。化合物2,5,7为首次从苍耳中分离得到。     

楤木根的化学成分研究

利用柱色谱、薄层色谱、高效液相色谱及波谱分析等分离技术对楤木根进行了化学成分研究.从云南产楤木根的95%乙醇提取物中分离并鉴定得到8个化合物,分别鉴定为:3-O-β-D-葡萄糖苷(1)、芹黄素-7-O-α-L-鼠李糖苷(2)、咖啡酸乙酯(3)、反式阿魏酸(4)、咖啡酸甲酯(5)、3-甲氧基-4-羟基苯甲醛(6)、香兰醇(7)、β-谷甾醇(8).其中,化合物1~7为首次从该种植物中分离得到.     

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.     

甘肃东紫苏的化学成分研究(Ⅰ)

目的研究东紫苏(Elsholtzia bodinieri)全草的化学成分。方法采用硅胶柱色谱及薄层色谱进行分离和纯化,通过理化性质和波谱数据分析鉴定其结构。结果从东紫苏全草的乙醇提取物中分离出6种化合物,分别鉴定为:三达右松脂-15-烯-8β,12β-二醇(1),表没食子儿茶素(2),小麦黄酮(3),金合欢素(4),槲皮素(5)和β-谷甾醇(6)。结论化合物1和2为首次从该属植物中分离得到。     

浙贝母花化学成分研究

对浙贝母花95%乙醇提取物的乙酸乙酯部位进行化学成分研究。运用正相硅胶柱色谱、反相C18中压柱色谱及半制备高效液相色谱进行分离纯化,通过核磁共振波谱及质谱鉴定得到化合物的结构。从浙贝母花乙酸乙酯部位共分离得到8种化合物,分别为正二十九烷(1)、亚油酸(2)、棕榈酸(3)、反式阿魏酸(4)、反式对羟基桂皮酸(5)、咖啡酸(6)、七叶内酯(7)、顺式对羟基桂皮酸(8),均为首次从浙贝母花中分离得到。     

野荆芥化学成分研究

从野荆芥(CaryopteristernifloraMaxim.)全草的乙醇提取物中分离出9种化合物,经波谱分析和理化常数测定确定其结构为软酯酸 1 甘油脂(1),齐墩果酸(2),acacetin 7 rutinoside(3),agnu side(4),β 谷甾醇(5),豆甾醇(6),胡萝卜甙(7),三十二烷醇(8)和三十四烷酸(9),其中1～4为首次从本属植物中分离得到     

打破碗花花化学成分研究

采用硅胶、Sephadex LH-20、制备液相等色谱方法对打破碗花花70%乙醇提取液进行分离纯化,运用理化性质和核磁共振波谱、质谱等数据进行结构鉴定.结果得到了15个化合物,分别鉴定为:棕榈酸(1)、4-甲氧基水杨醛(2)、邻苯二甲酸二甲酯(3)、苯甲酸(4)、桂皮酸(5)、3-(4′-formylphenoxy)-4-methoxybenzaldehyde(6)、eugenin(7)、滨蒿内酯(8)、7-甲氧基香豆素(9)、1,8-二羟基蒽醌(10)、咖啡酸甲酯(11)、齐墩果酸(12)、阿魏酸(13)、咖啡酸(14)、胸腺嘧啶核苷(15).化合物2～4、6～11为首次从银莲花属植物中分离得到,所有化合物均是首次从打破碗花花中分离得到.     

凤尾草化学成分研究(Ⅰ)

对采自云南省昆明市的凤尾草进行了系统的化学成分研究.采用柱层析、Sephadex LH-20、薄层层析等色谱方法,从凤尾草(Pteris multifida poir)全草95%工业乙醇提取物中分离得到一系列化合物,通过MS、NMR、2D-NMR等波谱分析手段鉴定了其中的6个化合物,分别为(2R,3S)-pterosin C(1)、Syringic acid(2)、ferulic acid(3)、isovanillic acid(4)、β-sitosterol(5)、daucosterol(6).化合物1为该属植物特征倍半萜类化合物蕨素,化合物2为首次从该植物中分得.     

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