傣药“小鱼眼草”化学成分的研究

目的探究傣药“小鱼眼草”的化学成分.方法采用各种柱色谱技术对小鱼眼草的乙醇提取物进行分离纯化,采用波谱技术结合化学方法进行结构鉴定.结果从小鱼眼草全草提取物中分离得到了15个化合物,包括6个生物碱类,5个萜类,2个黄酮类和3个酚酸类,分别鉴定为胡椒碱（1）、辣椒碱（2）、二氢辣椒碱（3）、3-吲哚甲酸乙酯（4）、3-吲哚甲酸甲酯（5）、3-甲酰基吲哚（6）、pomolic acid（7）、floridiolide A（8）、16-methoxycleroda-3,13-dien-15,16-olide-18-oic acid（9）、16-ethoxycleroda-3,13-dien-15,16-olide-18-oic acid（10）、木栓酮（11）、山奈酚（12）、槲皮素（13）、syringenin isovalerate（14）、没食子酸（15）.结论化合物1~12、14为首次从该植物中分离得到.     

鹊肾树树叶化学成分研究

利用硅胶柱层析、硅胶薄层层析和Sephadex LH-20柱层析等方法,对鹊肾树Streblus aspo树叶75%乙醇提取物的化学成分进行研究,分离得到6个化合物,并通过UV、IR、NMR、MS等现代谱学方法鉴定化合物的结构.6个化合物经鉴定为:川芎哚(Ⅰ)、3-羧基川芎哚(Ⅱ)、1-乙酰基-β-咔啉(Ⅲ)、齐墩果酸(Ⅳ)、α-乳香酸(V)和β-乳香酸(Ⅵ).其中化合物Ⅰ、Ⅱ、Ⅲ、Ⅴ和Ⅵ为首次从该植物中分离得到.     

异叶败酱化学成分的研究及体外细胞毒性检测

采用硅胶柱色谱法对异叶败酱（Patrinia heterophylla Bunge.）化学成分进行了研究．通过理化性质及波谱学方法对分离得到的化合物进行结构鉴定，并运用SRB法对分离的部分化合物进行体外细胞毒性测试．从该植物中分离鉴定了10个化合物，分别为：软木三萜酮（I），齐墩果酸（Ⅱ），熊果酸（Ⅲ），常春藤皂甙元（Ⅳ），海棠果醇（V），齐墩果酸-3—O-α—L-吡喃阿拉伯糖苷（Ⅵ），β-香树精（Ⅶ），α-香树精（Ⅷ），β-谷甾醇（Ⅸ），胡萝卜苷（X），除化合物Ⅱ之外，其余化合物都是首次从该植物中分离得到．SRB法结果表明：化合物Ⅱ、Ⅲ、Ⅳ和Ⅵ有较强的细胞毒性．     

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。     

红树无瓣海桑果实中抗氧化活性成分研究

从红树无瓣海桑果实中分离出6个化合物,运用波谱学确定了化合物结构,分别鉴定为异鼠李素（1）,胡萝卜苷（2）,木栓酮（3）,熊果酸（4）,3,4-二羟基苯甲酸（5）,对-羟基-3-甲氧基苯甲酸（6）.化合物（1）,（3）,（4）对HepG2显示出抗氧化活性,其EC50值分别为（25.8士1.3）mM,（62.1±3.5）mM,（45.2±2.8）mM.化合物（1）～（6）均首次从该植物果实中分离得到.     

甜叶菊化学成分及其甜度的研究

以工业化的提取分离工艺从甜叶菊干叶中分离提纯得到了甜菊糖苷粗品;利用正相硅胶层析柱以及葡聚糖凝胶、十八烷基硅烷键合硅胶、聚苯乙烯树脂等反相层析柱,分离纯化甜菊糖苷粗品得到5个化合物;再利用薄层层析色谱,质谱,核磁共振等分析手段对所得各单体进行了结构鉴定。结果表明分离得的5种化合物分别为6-羟基-11（β-D-吡喃葡萄糖基）-2-十二酮（-hydroxy-11-(β-D-glucopyranosyl)-2-cyclododecanone,Ⅰ）、莱鲍迪A苷（rebaudioside A,Ⅱ）、莱鲍迪B苷（rebaudioside B,Ⅲ）、莱鲍迪M苷（rebaudioside M,Ⅳ）和葡萄糖（glucose,Ⅴ）,其中单体Ⅰ为新的化合物。利用甜度定量预测模型对化合物Ⅰ、Ⅱ、Ⅲ、Ⅳ进行甜度分析,其甜度分别为蔗糖的113.6、225.0、325.0、29.4倍。     

竹节草的化学成分研究

以乙醇提取,硅胶柱层析分离和波谱方法鉴定结构,从竹节草地上部分分离鉴定出5个化合物:3β-羟基-5,α8α-桥二氧麦角甾-6,22-二烯(Ⅰ)、槲皮素(Ⅱ)、3-O-β-D-吡喃葡萄糖(6→1)-α-L-鼠李糖槲皮素(Ⅲ)、胡萝卜苷(Ⅳ)、po insettifo lin A 3-O-[3′″″-乙酰基-α-L-吡喃阿拉伯糖基-(1′″″→6″″)]-β-D-吡喃葡萄糖苷(Ⅴ).其中化合物Ⅴ为新化合物,化合物Ⅰ和Ⅲ系首次从该属植物中分离得到.     

刺山柑果实的化学成分

为阐明野西瓜的活性成分,为开发利用药效成分提供科学依据,对其果实进行了较系统的化学成分研究.方法:采用溶剂萃取和柱色谱方法分离纯化,根据理化性质和波谱学数据鉴定化合物结构.结果:从野西瓜果实乙醇提取物中分离鉴定了7个化合物:胡萝卜苷(I),邻羟基苯甲酸(II),芦丁(III),蔗糖(IV),没食子酸(V),山奈酚(VI),异鼠李素(VII).结论:化合物(II)、(III)、(V)、(VII)均为首次从该植物中获得.     

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。     

用XPS技术表征Er(Ⅲ)二元和三元配合物

二元配合物ErL-3（L=吲哚-3-乙酸,吲哚-3-丙酸,吲哚-3-丁酸）中,羧基的两个氧原子与Er（Ⅲ）双齿配位.三元配合物ErL3· phen中,3个配体吲哚酸分子有部分（1或2个吲哚酸分子）以双齿配位,其它吲哚酸分子以 单齿配位.吲哚环中的氮原子未参加配位,邻菲G86AA啉分子中的两个氮原子参加配位.     

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).     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.