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...     

狭基香茶菜水溶性多糖的分离纯化及组成的定性研究

狭基香茶菜干燥后经水提取、醇沉淀再经ＳｅｐｈａｄｅｘＧ－１５０柱色谱纯化,分离得到４种狭基香茶菜水溶性多糖ＡＲＰ、ＡＲＰ－２、ＡＲＰ－３和ＡＲＰ－４;采用ＳｅｐｈａｄｅｓｘＧ－２００柱层析,琼脂糖凝胶电泳等方法证明为均一性多糖组分,用凝胶谱法测得相对平均分子质量分别是４２０００、９４００、３４０００和８７００;红外光谱,高效液相色谱等表明,ＡＲＰ－１由Ｌ－鼠李糖、Ｄ－１葡萄糖组成,糖残基以α１,２     

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。     

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。     

尾叶香茶菜化学成分及药理作用的研究

从尾叶香茶菜(Rabdosia excisa)的地上部分分离到11种化合物,其中5种经过测定其熔点、比旋度、紫外光谱、红外光谱、核磁共振和质谱等结果,分别鉴定为isokamebakaurin,oridonin, 齐墩果酸, 熊果酸,β-谷甾醇.其中isokamebakaurin是首次从尾叶香茶菜中分离到的.对于醇提水溶部位,进行了药理作用研究,证明其具有一定的免疫调节、抗菌作用及显著的抗氧化作用.本研究结果为进一步从尾叶香茶菜中提取药物提供了指导性依据.     

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．     

RP-HPLC法测定不同生长期尾叶香茶菜中二萜类成分的含量

采用反相高效液相色谱法测定了不同生长期尾叶香茶菜叶的4种主要二萜类成分kamebakaurin(Ⅰ), excisanin A(Ⅱ)， rabdokunmin C(Ⅲ)和kamebanin(Ⅳ)的含量. 结果表明， 不同生长期尾叶香茶菜叶中二萜类成分含量发生变化. 化合物Ⅰ和Ⅱ在7月上旬含量最高； 化合物Ⅲ在6月初到8月中旬含量变化不大， 但8月上旬含量开始下降；化合物Ⅳ在6月中旬含量最高， 7月上旬含量开始下降. 7月上旬尾叶香茶菜中总二萜类成分含量最高.     

紫毛香茶菜二萜成分研究

从紫毛香茶菜干叶的乙醇提取物中分离得到２个二萜化合物,利用红外、紫外、质谱以及核磁共振波谱等光谱方法,对这２个化合物的结构进行了鉴定．紫毛香茶菜的化学成分尚未见文献报道．     

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     

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。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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-