漆姑草挥发油化学成分的研究

采用水蒸气蒸馏方法提取漆姑草挥发油,测得漆姑草挥发油的含量为0.08%;利用GC-MS联用技术从漆姑草挥发油中分离并鉴定出28种化学成分,占总挥发油的69.635%;用峰面积归一化法通过化学工作站数据处理系统得出各化学成分在挥发油中的相对百分含量。方法稳定可靠,为开发及综合利用漆姑草提供科学依据。     

甘肃庆阳地椒草茎部挥发油化学成分的研究

研究甘肃庆阳地椒草(Thymus quinquecostatus Celak)茎部挥发油的化学成分。采用水蒸汽蒸馏法提取地椒草茎中的挥发油;经气相色谱-质谱技术分离和鉴定,用归一化法测定其相对百分含量。从挥发油中共分离和鉴定出了76种化学成分。地椒草茎中的主要成分有香芹酚(20.112%)、2-乙酮基-3,5-二甲氧基-苯酚(9.209%)、乙酸乙酯(6.536%)、桉油精(5.938%)等。为进一步研究地椒草药理作用提供了科学依据。     

小鱼眼草挥发油化学成分及抑菌活性研究

研究小鱼眼草挥发油的化学成分,并探讨其抑菌活性。方法:采用水蒸气蒸馏法提取挥发油,气相色谱一质谱联用技术进行挥发油化学组分分析;打孔法进行抑菌活性实验。结果:小鱼眼草挥发油提取率为0.5%,主要成分为α,α.4-三甲基-环已-3-烯-1-甲醇(3-Cyclohexen-1-methanol,α,α.4-trimethyl-),占6.66%,其次为苯甲醛(Benzalde-hyde),占5.68%;α-杜松醇(α-Cadinol),占4.33%。抑菌实验中,小鱼眼草挥发油对多种菌株均有抑菌效果。结论:小鱼眼草挥发油主要成分为萜类,其挥发油具有广谱抗菌作用。     

红花香雪兰挥发油提取方法及化学成分分析

采用水蒸气蒸馏、有机溶剂萃取以及微波萃取方法提取红花香雪兰挥发油,利用气相色谱-质谱联用技术(GC-MS)对提取的挥发油成分进行了分析.结果显示:不同提取方法获得的挥发油化学成分及其含量差异较大,共鉴定出9类78种化学成分.其中采用水蒸气蒸馏法得到的挥发油相对含量较高的有沉香醇(30.511%)、二甲基亚砜(24.191%)和α-松油醇(18.701%);有机溶剂萃取方法得到的挥发油成分主要是烃类化合物(68.656%),沉香醇、二甲基亚砜和α-松油醇也具有较高的相对含量;而微波萃取方法获得的挥发油主要成分是脂肪酸(51.369%),亚油酸、棕榈酸和亚麻酸的相对含量分别是18.691%,17.387%和15.291%.这说明不同的提取方法得到的挥发油成分各不相同,它们的联合运用可以相对全面地分析香雪兰挥发油的成分.     

甘青青兰挥发性成分GC/MS分析

目的：分离鉴定出甘青青兰（Dracocephalum tanguticum Maxim.）挥发油的化学成分.方法：用气相色谱-质谱（GC/MS）联用技术及峰面积归一化法测定各组分的相对含量.结果：共鉴定出23种化合物,占总色谱峰总面积的87.46%.结论：甘青青兰挥发油中的化学成分主要为[-]-反-松香芹乙酯和桉油精,两者分别占总挥发油中化学成分的60.30%和9.31%.     

GC-MS法测定分析吴茱萸挥发油的有效化学成分

尝试快速分析吴茱萸果实中的挥发油组分,为后续的吴茱萸功效-毒性物质基础研究提供依据.通过水蒸气蒸馏法提取挥发油,运用气相色谱—质谱(GC-MS)联用技术测定了吴茱萸挥发油中所含的化学成分和其相对含量.结果表明:一共含有48种化合物,占吴茱萸挥发油含量的93.99%,其中相对含量较高的成分有(Z)-罗勒烯(60.57%)、(E)-罗勒烯(9.11%)、月桂烯(5.94%)、石竹烯(1.78%)、β-榄香烯(2.04%).吴茱萸挥发油中的化学成分十分丰富,使用GC-MS方法可以快速高效地鉴别它的有效挥发油成分.     

贵州产山蜡梅不同部位挥发油化学成分分析

比较贵州产山蜡梅不同部位(器官)挥发油化学成分的异同.采用水蒸气蒸馏法提取山蜡梅根、茎、叶、果皮的挥发油,并用GC-MS联用仪鉴定各化合物,峰面积归一化法测定各成分含量.结果从山蜡梅根、叶、茎和果皮中共分离鉴定了76个化合物,其中共有化合物8个,分别占各器官挥发油总量的43.08%,7.87%,57.55%,66.72%.根中挥发油以桉树脑、4-萜品烯、芳樟丙酸为主;叶中挥发油以榄香脑和β-桉叶油醇为主;茎中挥发油以龙脑、α-杜松醇、桉树脑为主;而果皮中挥发油则以石竹烯氧化物和葎草烯氧化物为主.贵州产山蜡梅果皮和茎的挥发油成分组成基本一致,但与根、叶中挥发油组成存在差异.本研究为山蜡梅挥发油的开发利用提供了重要的依据.     

不同采集期艾叶挥发油含量和化学成分的研究

采用水蒸气蒸馏法提取了艾叶挥发油,用气相色谱-质谱法(GC/MS)对其化学成分进行了分析,比较了6种采集期不同的艾叶挥发油的含量和化学成分.结果表明:6种采集期艾叶中挥发油质量分数分别为0.607%,0.750%,0.953%,0.884%,0.751%,0.680%,鉴定出的化学成分数目依次为29,32,29,27,34和28种,有17种相同的化合物被检出.通过比较艾叶挥发油主要成分,如1,8-桉叶油素、樟脑、龙脑、4-萜烯醇等时发现,6月2日采集的艾叶中的挥发油含量最高,品质最好,6月上旬为艾叶的最佳采收期.     

香叶菖蒲与石菖蒲挥发油成分对比分析

目的研究香叶菖蒲和药典石菖蒲新鲜叶的挥发油化学成分,并进行对比分析。方法采用水蒸气蒸馏法提取香叶菖蒲和石菖蒲挥发油,应用气相色谱-质谱联用仪(GC-MS)对挥发油的化学成分进行研究。结果从香叶菖蒲和石菖蒲挥发油中分别鉴定了12和13种成分,主要化学成分的种类相似,其中α-细辛醚为二者的主要成分,含量分别占总挥发油的69.52%和49.57%。结论香叶菖蒲和石菖蒲挥发油含量丰富,研究结果为二者的进一步开发利用提供了实验依据。     

植物马桑中挥发油成分的GC-MS分析

利用水蒸气蒸馏法提取马桑叶和茎中的挥发油,并采用气-质联用(GC-MS)方法对挥发油中化学成分进行分析.鉴定出了马桑叶和茎中的挥发油成分中的20及26种化合物,马桑叶挥发油中所鉴定出的主要成分为二苯胺和邻苯二甲酸异丁酯,含量分别为10.22%和10.07%.马桑茎挥发油中鉴定出的主要成分也为二苯胺和邻苯二甲酸异丁酯,但含量与马桑叶中不同,分别为1.61%和1.05%.     

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