蝎子七化学成分的研究

从甘肃天祝县的蝎子七全草中分离鉴定出了15个化合物，其中2个为新化合物，报道9个已知化合物：阿魏酸、4-豆甾烯-3-酮、紫丁香甙、5，8，2′-三羟基-5′—甲氧基双氢黄酮、异鼠李素、槲皮素-3-O-鼠李素、山奈素-3-O-β-D-葡萄糖甙、洋芥素-7-O-β-D-葡萄糖甙、5-羟基-4-甲氧基黄酮-7-O-β-芸香甙。上述成分均首次从该植物中分离。     

藤梨正丁醇部位化学成分的研究

采用薄层色谱,正相、反相硅胶,葡聚糖凝胶,半制备高效液相柱对中药藤梨的正丁醇部位进行了分离研究.得到8个化合物,分别为:2-β-D-葡萄糖-1,3,7-三羟基-酮(1),7-O-[β-D-吡喃木糖-(1-6)-β-D-吡喃葡萄糖苷]-1,8-二羟基-3-甲氧基-酮(2),3-O-[β-D-吡喃鼠李糖-(1-6)-β-D-吡喃葡萄糖]-5,7,4′-三羟基黄酮(3),6-C-葡萄糖-5,7,3′,4′-四羟基黄酮(4),6-C-葡萄糖-5,7,4′-三羟基黄酮(5),1-O-[β-D-吡喃木糖-(1-6)-β-D-吡喃葡萄糖苷]-8-羟基-3,7-二甲氧基-酮(6),3-O-[β-D-吡喃鼠李糖-(1-6)-β-D-吡喃半乳糖]-5,7,3′,4′-四羟基黄酮(7),7-O-[β-D-吡喃鼠李糖-(1-6)-β-D-吡喃葡萄糖]-5,3′-二羟基-4′-甲氧基二氢黄酮(8).所有的化合物都是首次从该植物分离得到.     

裂叶荆芥芥穗黄酮及两种单萜成分研究

对裂叶荆芥芥穗化学成分进行了研究。从70％乙醇提取物中首次分得4个黄酮和2个单萜类化合物单体，经化学和光谱学分析，它们分别为：5，7－二羟基－4，6－二甲氧基黄酮、木犀草素－7－氧－葡萄糖甙、3′－羟基－4′，6，8－三甲氧基二氢黄酮－7－氧－芸香糖甙、5－甲基－3′－羟基－4′，6－二甲氧基二氢黄酮－7－氧－芸香糖甙、脱氢枞油烯和荆芥内酯。所有化合物均为首次从该科植物中获得。     

水青树茎干中化学成分的提取与分离

采用硅胶柱色谱、Sephadex LH-20柱色谱、RP-18柱色谱方法对水青树(TetracentronsinenseOliv.)茎干进行了成分分离纯化,并利用UV、NMR、MS等波谱光谱方法对化学成分进行结构鉴定.共从水青树乙酸乙酯与正丁醇萃取部分中分离并鉴定了15个化合物,分别为2-羟基-5-(2-羟乙基)苯β-D-葡萄糖甙(1),2,6-二甲氧基-4-羟基苯1-O-β-D-吡喃葡萄糖甙(2),3,5-二甲氧基-4-羟基苯1-O-β-D-吡喃葡萄糖甙(3),丁香酸β-D-葡萄糖酯(4),丁香酸4-β-D-葡萄糖甙(5),甲氧基四氢醌-4-β-D-葡萄糖甙(6),甲氧基四氢醌-1-β-D-葡萄糖甙(7),对-羟基肉桂酸(8),β-乙酰鼠李糖甙(9),α-乙酰鼠李糖甙(10),(+)-儿茶素(11),羽扇醇(12),3β,20-羽扇二醇(13),白桦子酸(14),齐墩果酸(15).除化合物11-13和15外,其余化合物均为首次从该植物中分离得到.     

石香薷中的黄酮体化合物

从石香薷中分出四个黄酮类化合物 ,通过光谱分析及结合标样对照 ,确定其结构分别为 5 ,7 二甲氧基 4’ 羟基黄酮 (1) ,芹菜素 7 O а L鼠李糖 (1→ 4 ) 6” O 乙酰基 β D 葡萄糖甙 (2 ) ,5、7 二甲氧基 4’ O α L 鼠李糖 (1→ 2 ) β D 葡萄糖甙 (3)及金合欢素 7 O 芸香甙 (4) .     

苦瓜皂甙的分离以及PTP1B抑制活性

通过溶剂萃取、大孔树脂D-101去杂、正相硅胶柱粗分、ODS反相硅胶柱反复分离纯化、薄层色谱检测,从苦瓜中分离出5种化合物.借助于ESI-MS、IR、13C NMR、1H NMR、DEPT-NMR等波谱技术,对这5种化合物进行结构鉴定.结果表明,此5种化合物都属于皂甙类,其中化合物A是甾体皂甙,其余4种为四环三萜葫芦烷皂甙.这5个化合物分别为:A为α-菠甾醇-3-O-β-D-吡喃葡萄糖甙;B为19(R)-羰基-25-二甲氧基-5β-葫芦烷-6,23-二烯-3β,25-羟基-5-19环氧酯-3-O-β-D-吡喃葡萄糖甙;C为葫芦烷-5-烯-3β,22,23,24,25-五基-3-O-3-β-D-吡喃葡萄糖(1→6)-D-吡喃葡萄糖甙(苦瓜素A);D为葫芦烷-5,23-二烯-3p,7,25-羟基-9-醛基-7-O-β-D-吡喃葡萄糖甙(苦瓜素L);E为葫芦烷-5,23-二烯-3β,7-二羟基-9-醛基-25-甲氧基-7-O-β-D-吡喃葡萄糖甙(苦瓜素K).5种化合物进行PTP1B抑制活性筛选试验,结果表明,这5种皂甙单体中,化合物D和化合物E对PTP1B没有抑制活性,化合物A、B、C对PTP1B有不同程度的抑制活性,其中抑制活性大小为化合物A＞化合物C＞化合物B.     

庆阳乌蓼中黄酮类化合物的研究

从甘肃庆阳产中草药乌蓼中首次分离得到了５个黄酮类化合物：５７二羟基６７二甲氧基黄酮（１）,５７二羟基黄酮（２）,５７二甲氧基４′羟基黄酮（３）,桑色素７ＯβＤ葡萄糖甙（４）,５羟基３′甲氧基双氢黄酮７Ｏ芸香糖甙（５）．     

土贝母乙酸乙酯部位化学成分研究

通过现代分离技术并经波普分析研究,分离得到了土贝母乙酸乙酯部位8个化合物,并鉴定为:7-羟基-6-甲氧基香豆素(1)、表儿茶素(2)、儿茶素(3)、(E)-N-(4-羟基苯乙基)-3-(4-羟基-3-甲氧基苯基)丙烯酰胺(4)、邻苯二甲酸二丁酯(5)、(Z)-3-O-咖啡酰基-4-O-甲基奎宁酸甲酯(6)、绿原酸(7)、3-O-[β-D-吡喃鼠李糖-(1-6)-β-D-吡喃葡萄糖]-5,7,4'-三羟基黄酮(8).此8个化合物均为首次从该植物中分离得到.     

仔榄树的化学成分

采用硅胶柱层析、ODS和Sephadex LH-20等色谱技术,从仔榄树叶体积分数为95%乙醇提取物的正丁醇萃取部位分离得到11个化合物;通过理化性质和波谱数据分析,鉴定它们的结构分别为(±)-赤-3-甲氧基-4-羟基苯基丙三醇(1)、(±)-苏-3-甲氧基-4-羟基苯基丙三醇(2)、(+)-syringaresinol-4,4’-O-bis-β-D-glucopyranoside(3)、1,3,5-三甲氧基苯(4)、丁香酸葡萄糖苷(5)、2,6-二甲氧基-4-羟基-1-O-β-D-吡喃葡萄糖苷(6)、3,5-二甲氧基-苄醇-4-O-β-D-吡喃葡萄糖苷(7)、(2E,6S)-8-(α-L-arabinopyranosyl-(1″fwdarw6’)-β-D-glucopyranosyloxy)-2,6-dimethyloct-2-eno-1,2″-lactone(8)、山奈酚-3-O-β-D-吡喃葡萄糖苷(9)、2-甲胺基苯甲酸(10)、D-1-O-methyl-myo-in-ositol(11).化合物1～11均为首次从该植物中分离得到.     

马六甲蒲桃的化学成分

为从马六甲蒲桃果实中寻找化学成分,利用正反相硅胶柱色谱、凝胶柱色谱等技术对 马六甲蒲桃果实的乙醇提取物进行分离纯化,通过1 H-NMR和13C-NMR等波谱技术结合文献数据 对照进行化合物结构鉴定。共分离鉴定了17个化合物,分别为山奈酚3-O-β-D-吡喃葡萄糖（1）、 山奈酚-3-O-α-L-鼠李糖（2）、异鼠李素（3）、异鼠李素-3-O-α-L-鼠李糖（4）、槲皮素-3-O-α-L- 鼠李糖（5）、槲皮素-3-O-β-D-吡喃葡萄糖（6）、槲皮素-3-O-β-D-吡喃木糖（7）、杨梅素-4''-甲醚 -3-O-α-L-鼠李糖（8）、6,8-二甲基乔松素（9）、乔松素-7-O-β-D-吡喃葡萄糖（10）、 stercurensin （11）、根皮苷（12）、3-甲氧基鞣花酸-3′-O-α-L-吡喃鼠李糖（13）,4,5-二羟基-6-甲基-α-吡喃酮 （14）、5,7-二羟基-2-甲基色原酮（15）、反式肉桂酸（16）和苹果酸二甲酯（17）。其中化合物1~10为 黄酮,11和12为查尔酮,其中,化合物4、6、14、15和17首次从蒲桃属植物中分离得到,1、4、5、6、9、 10、13~17首次从马六甲蒲桃中分离得到,所有化合物均首次从马六甲蒲桃果实中分离得到。     

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.     

A computer generator for randomly layered structures

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

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

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.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.