黄芩黄酮对自由基的清除作用的ESR研究

采用电子自旋共振（ＥＳＲ）法和自旋捕获技术研究了中药黄芩中四种主要黄酮（黄芩素、黄芩甙、汉黄芩素和汉黄芩甙）的自由基清除作用及可能的作用机理．结果表明黄芩素和黄芩甙对羟自由基、超氧阴离子自由基、烷过氧自由基及ＤＰＰＨ自由基有较强的清除作用,而汉黄芩素和汉黄芩甙在测定浓度范围内对上述自由基作用较弱或无明显的清除作用．黄芩素和黄芩甙的自由基清除活性大大高于汉黄芩素和汉黄芩甙的原因是其结构中含有邻二酚结构     

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。     

黄芩黄酮对自由基的清除作用的ESR研究

采用电子自旋共振法和自旋捕获研究中药黄芩中四种主要黄酮的自由基清除作用及可能的作用机理。结果表明黄芩素和黄芩甙对羟自由基，超氧阴离子自由基，烷过氧自由基及ＤＰＰＨ自由基有较强的清除作用，页汉黄芩素和汉黄芩甙在测定深度深度范围内对上述自由基作用较弱或无明显的清除作用。     

秦岭中草药黄芩中黄酮类化合物的分离

目的 分离鉴定秦岭中草药黄芩中的黄酮类物质并研究其对α-葡萄糖苷酶的抑制活性.方法 植物原料用溶剂提取,常压硅胶柱色谱及制备液相色谱分离,高分辨质谱及核磁共振波谱分析确定化合物分子结构,PNPG法测定化合物的α-葡萄糖苷酶的抑制活性.结果 分离鉴定了8种黄酮类化合物,分别是汉黄芩素(1)、黄芩素(2)、汉黄芩苷(3)、千层纸素A-7-O-葡萄糖酸苷(4)、白杨素-7-O-葡萄糖酸苷(5)、黄芩苷(6)、黄芩素-6-O-葡萄糖酸苷(7)和去甲汉黄芩素-8-O-葡萄糖酸苷(8),活性实验表明化合物1和7表现出较好的α-葡萄糖苷酶的抑制活性,其IC50分别为0.13 mmol/L和0.25 mmol/L,稍强于阳性对照阿卡波糖(IC50:0.42 mmol/L).结论 秦岭中草药黄芩中某些黄酮类物质能够有效抑制α-葡萄糖苷酶,具有与阿卡波糖相当的降糖作用.     

秦岭中草药黄芩中黄酮类化合物的分离及其α-葡萄糖苷酶抑制活性研究

目的分离鉴定秦岭中草药黄芩中的黄酮类物质并研究其对α-葡萄糖苷酶的抑制活性。方法植物原料用溶剂提取,常压硅胶柱色谱及制备液相色谱分离,高分辨质谱及核磁共振波谱分析确定化合物分子结构,PNPG法测定化合物的α-葡萄糖苷酶的抑制活性。结果分离鉴定了8种黄酮类化合物,分别是汉黄芩素(1)、黄芩素(2)、汉黄芩苷(3)、千层纸素A-7-O-葡萄糖酸苷(4)、白杨素-7-O-葡萄糖酸苷(5)、黄芩苷(6)、黄芩素-6-O-葡萄糖酸苷(7)和去甲汉黄芩素-8-O-葡萄糖酸苷(8),活性实验表明化合物1和7表现出较好的α-葡萄糖苷酶的抑制活性,其IC_(50)分别为0.13mmol/L和0.25mmol/L,稍强于阳性对照阿卡波糖(IC_(50):0.42mmol/L)。结论秦岭中草药黄芩中某些黄酮类物质能够有效抑制α-葡萄糖苷酶,具有与阿卡波糖相当的降糖作用。     

中亚紫菀木化学成分的研究

从中亚紫菀木中分离出１０种化合物，经光谱及化学方法鉴定为乙酰羽扇豆甾醇、木栓酮、木栓醇、β－谷甾醇、菠苗醇－３－葡萄糖甙、东莨菪素－７－β－葡萄糖甙、槲皮素、槲皮素－３－β－半乳糖甙、４－阿魏酰硅宁酸、贝萼宁－３－葡萄糖甙。     

巴天酸模中的黄酮化合物

从巴天酸模 (PolygonumRumexPatientiaL .)的全草中分离得到 5个黄酮化合物 ,经化学方法和各种光谱数据鉴定了其结构 ,分别是山奈酚 (kaempferol,Ⅰ) ,槲皮素 3 O β D 葡萄糖甙 (quercetin 3 O β D glucoside ,Ⅱ) ,异鼠李素 (isorhamnetin ,Ⅲ ) ,山奈素 3 O β D 葡萄糖甙 (kaempferol 3 O β D glucoside ,Ⅳ )和 5 羟基 4′ 甲氧基黄酮 7 O β 芸香糖甙 ( 5 hydro 4′ methyoxyflavanone 7 O β rutinoside ,Ⅴ ) .化合物Ⅲ、Ⅳ和Ⅴ系首次从该植物中分得     

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。     

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.     

圆果甘草化学成分研究（Ⅰ）

从圆果甘草干燥根茎的石油醚和二氯甲烷提取物中首次分离得到７个化合物。经光谱分析和与已知品对照分别鉴定为：正二十五烷、正二十六烷酸、７，４’－二羟基黄酮、异甘草素、４－羟基－２，４’－二甲氧基查耳酮、甘草甙和蔗糖。     

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.     

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.     

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).     

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.