薜荔叶化学成分及其活性研究

采用硅胶柱层析、ODS反相柱层析、Sephadex LH-20凝胶柱层析、半制备高效液相HPLC等色谱分离方法对薜荔（Ficus pumila）叶80%乙醇提取物进行分离纯化,得到7个化合物。根据化合物的理化性质和核磁共振波谱数据比对文献,分别鉴定为：3-hydroxy-damascone (1),月桂酸乙酯（2）,马桑酸（3）,13-hydroxy-(9Z,11E,15E)-octadecatrienoic acid (4),乙基-β-D-吡喃葡萄糖苷（5）,苄醇-β-D-葡萄糖苷（6）和2-[4-(3-hydroxypropyl)-2-methoxyphenoxy]-propane-1,3-diol (7)。其中化合物7为首次从该属植物中分离得到,化合物1为首次从该植物中分离得到。抗肿瘤活性测试结果表明,化合物1对A549细胞显示出一定的抑制活性,IC50值为32.21μg/mL。抗菌活性测试结果表明,所有化合物对测试的4株人体致病菌和2株弧菌均无明显抗菌活性。     

刺松藻内生真菌长枝木霉的化学成分研究

对烟台近岸的绿藻刺松藻来源的一株内生真菌长枝木霉的次生代谢产物进行了探索.通过硅胶柱层析、葡聚糖凝胶Sephadex LH-20柱层析、制备薄层层析和高效液相色谱等色谱分离手段,以及超导核磁共振等波谱鉴定技术,从该菌的马铃薯-葡萄糖和菊芋-葡萄糖液体培养基发酵产物中继续分离并鉴定了5个化合物,包括5α,8α-环氧麦角甾-6,22-二烯-3β-醇（1）;麦角-7,22-二烯-3β,5α,6β-三醇（2）;β-谷甾醇（3）;5-羟基-3-甲基戊-2-烯酸（4）和角鲨烯（5）.化合物4和5均为首次从木霉中分离得到.抑菌活性测试结果表明化合物1～5对细菌和真菌无明显抑制作用.     

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．     

竹柏化学成分的研究

竹柏枝叶用氯仿提取,硅胶柱层析、MCI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9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,鉴定结构分别为:nagilactone A(1)、4β,10β,15-trihydroxy-aromadendrane-10,15-acetonide(2)、amentoflavone(3)、bilobetin(4)、podocarpusflavone A(5)、quercetin(6)、(-)-catechin(7)、5α,6β-dihydroxysitosterol(8)和prinsepiol(9).其中化合物2、4、8和9为首次从该属中分离得到.     

姜花中二芳基庚烷及黄酮成分的分离鉴定

姜花（ Hedychium coronarium Koen）根茎用甲醇提取,利用硅胶柱层析、Sephadex LH-20 柱层析、薄层层析及HPLC等手段对其化学成分进行分离纯化,得到5个化合物,经波谱解析和对 其理化性质进行对比,鉴定为3个二芳基庚烷和2个黄酮,分别是gingerenone A（1 1）,rel-（3 R ,5 S ）-3, 5-dihydroxy-1-（4-hydroxy-3-methoxyphenyl）-7-（4-hydroxyphenyl）-heptane（2 2）,hexahydrocurcumin （3 3）,3,5,7,4´-tetramethoxyflavone（4 4）和5-hydroxy-3,7,4´-trimethoxyflavone（5 5）。化合物1 1～4 4为 首次从姜花中分离得到。     

川鄂金丝桃的化学成分研究

综合应用大孔树脂柱层析、正相硅胶柱层析、葡聚糖凝胶色谱、高效液相色谱等多种分离方法从川鄂金丝桃石油醚部位(HW-PE)中分离得到15个化合物,运用现代波谱技术分别鉴定为folecitin(1)、表儿茶素(2)、β-谷甾醇(3)、β-胡萝卜素(4)、白桦脂酮酸(5)、单棕榈酸甘油(6)、l,7-二甲氧基-3,6-二羟基氧...     

槐豆荚中黄酮成分的研究

槐(Sophora japonica)豆荚用甲醇提取,采用硅胶柱层析、Sephadex LH-20凝胶柱层析、MCI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。根据波谱分析和理化性质对化合物结构进行鉴定,鉴定结构为山柰酚(1)、山柰酚3-O-β-槐糖苷(2)、山柰酚3-O-α-L-鼠李糖基(1→6)-β-D-葡萄糖苷(3)、山柰酚3-O-α-L-鼠李糖基(1→4)-β-D-葡萄糖苷(4)、山柰酚3-O-α-L-鼠李糖苷-7-O-β-D-葡萄糖苷(5)、染料木素(6)、染料木苷(7)和槐属双苷(8)。其中,化合物4和5为首次从槐属植物中离得到,化合物2和7为首次从该植物中分离得到。     

兴安蒲公英根部化学成分研究

运用硅胶柱层析和HPLC等色谱方法对黑龙江省牡丹江产兴安蒲公英根部的化学成分进行研究,分离得到了8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对羟基苯乙酸甲酯（1）,原儿茶醛（2）,丁二酸单乙酯（3）,蒲公英内酯（4）,α－棕榈酸单甘油酯（5）,单亚油酸甘油酯（6）,β-谷甾醇－3－O-β-D－葡萄糖苷（7）,正丁基－β－D葡萄糖苷（8）。其中1～3,5-6,8为首次从该植物中分离得到。     

山土瓜化学成分的研究

山土瓜(Ipomoea hungaiensis Lingelsh.et Borza)根茎用甲醇提取,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7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:3β-friedlinol(1)、lupeol3-(3'R-hydroxy)-octadecanoate(2)、6,7-dihydroxycoumarin(3)、octadecyl caffeate(4)、syringic acid(5)、β-sitosterol-β-D-glucopyranoside(6)和β-谷甾醇(7).其中化合物(2)、(5)为首次从该植物中分离得到.     

白蒺藜果实的化学成分研究

采用硅胶柱层析、凝胶柱层析从白蒺藜（Tribulus terrestris L.）醇提液正丁醇萃取层中分离纯化得到8个化合物,运用核磁共振、质谱等光谱方法鉴定结构分别为：N-对羟基苯乙酮基-3-甲氧基-4-羟基取代桂皮酰胺（Ⅰ）,槲皮素-3-O-β-D-葡萄糖苷 (Ⅱ),3′-甲氧基-槲皮素-3-O-β-D 葡萄糖苷(Ⅲ),3′-甲氧基-槲皮素-3-O-β-D-龙胆二糖苷（Ⅳ）,海柯皂苷元-3-O-β-D-吡喃葡糖基-(1-4)-β-D-吡喃半乳糖苷（Ⅴ）,海柯皂苷元-3-O-β-D-吡喃半乳糖基(1-2)-［β-D-木糖基(1-3)］-β-D-吡喃葡糖基(1-4)-β-D-吡喃-半乳糖苷（Ⅵ）,苯甲酸（Ⅶ）,尿嘧啶核苷（Ⅷ）。其中化合物Ⅳ,Ⅶ,Ⅷ为首次从该植物中分离得到,也是首次从该属植物中分离获得。     

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.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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