甘薯多糖SPP-Ⅰ的制备与结构初步研究

研究采用水提醇沉法提取甘薯粗多糖,进行单因素试验考察,用正交法优化工艺.再经DEAE-纤维素-52阴离子交换柱和Sephadex G200凝胶柱对所得粗多糖进行层析纯化,得到甘薯多糖组分SPP-Ⅰ.应用苯酚硫酸法测定多糖百分含量,HPLC法测定多糖分子质量,紫外光谱、红外光谱、甲基化衍生结合GC-MS分析多糖结构.结果表明甘薯多糖最优提取工艺为提取温度90℃,提取时间3 h,液料比40∶1,提取次数3次.甘薯多糖SPP-Ⅰ总糖百分含量分别为97. 61%,分子质量为245ku,紫外光谱扫描结果显示无核酸和蛋白质吸收峰,红外光谱扫描结果表明含有多糖类物质的特征吸收峰,结合甲基化和GC-MS分析初步确定甘薯多糖SPP-Ⅰ是具有1→3、1→3→6糖苷键结构的α-葡聚糖.     

IAD法在合成β-甘露糖苷键中的应用

β-甘露糖苷键广泛存在于天然糖复合物中,但选择性地合成β-甘露糖苷键却非常困难;介绍了通过不同的混合缩酮和混合缩醛连接臂介导的分子内糖苷配体转移法（IAD）在选择性地合成β-甘露糖苷键中的应用,同时也讨论了不同连接臂的优势与不足.     

β-烷氧羰基烷基三氯化锡与5-氯水杨醛缩取代苯胺席夫碱配合物的合成和表征

利用β烷氧羰基乙基三氯化锡和β烷氧羰基丙基三氯化锡分别与5-氯水杨醛缩取代苯胺席夫碱反应，合成了14个新的配合物，并通过元素分析、IR、^1H NMR等手段对它们的结构进行了表征，结果表明配合物是含有分子内的羰基氧和酚羟基氧配位的六配位有机锡化合物．     

手掌参多糖的结构分析

从传统蒙药手掌参(GymanadeniaConopseaR.Br.)的干燥根茎中用热水提取、醇析方法直接得到不含蛋白质的纯手掌参多糖(GCP).采用Smith降解法、高效液相色谱法分析GCP的糖苷键连接方式,采用13CNMR、红外光谱分析法对其结构进行分析.结果表明,GCP主要是以1→3位和部分1→4位键合的糖苷键,红外光谱分析和1HNMR测定表明GCP糖苷键为β-吡喃型糖.     

短裙竹荪菌丝体糖蛋白DdGP-3P3纯化及性质研究

短裙竹荪菌丝体经热水抽提，乙醇分级沉淀，级分3经DEAE－Cellulose柱层析纯化得到短裙竹荪菌丝体糖蛋白DdGP-3P3。经测定该糖蛋白为均一组分，相对分子质量为113KDa，红外光谱呈现出典型的多糖吸收峰，含有β－型糖苷连接键。β－消去反应测定，该糖蛋白中糖和蛋白质的连续键为O－型糖肽键。纸层析和气相层析分析得知DdGP-3P3含有D－葡萄糖（D－glucose)、D-甘露糖（D－Mannose)和D－半乳糖（D－galactose)，其摩尔比为2．01：1．00：1．23。氨基酸分析表明它含有16种氨基酸。     

真菌多糖AbEXP 1-a的结构及其免疫调节活性研究

采用酸水解法、红外光谱法和核磁共振法对真菌多糖AbEXP 1-a的结构进行了研究,并对该多糖的免疫调节活性进行了动物实验检测.结果表明,多糖AbEXP 1-a分子由葡萄糖和甘露糖以3：1的比例构成.推测其主链由3个葡萄糖分子通过β-（1→6）糖苷键连在一起,再以α-（1→6）或β-（1→6）糖苷键与甘露糖连接而构成.多糖AbEXP 1-a对小鼠非特异性免疫、体液免疫和细胞免疫均有明显的促进作用,可提高小鼠迟发性变态反应,即多糖AbExP 1-a可以全面提高机体的免疫功能.其最适作用剂量为10 mg/kg体重.     

糖蛋白中糖链结构的不均一性与信息传递的关系

糖蛋白中糖链结构的不均一性具有普遍性，表现在某一糖链中少数特定糖基数目的微小变化；或某种特定糖基在糖链中连接位点连接糖苷键类型的不同。近年的研究表明，在细胞分化、癌变、自身免疫疾病中，“不均一性”起着传递信息的重要作用。“不均一性”形成的机理与糖链的生物合成相关，这又与糖基转移酶的活性变化密切相关，故应受基因的表达所调控。     

壳寡糖及其衍生物抗氧化作用的研究进展

壳寡糖是氨基葡萄糖以β-1,4-糖苷键连接而成的碱性寡糖,具有独特的生理活性．本文综述了近年来壳寡糖及其衍生物在体内外抗氧化作用及其机理的研究成果．     

天门冬糖蛋白AG-b的研究

ＡＧ＿ｂ为４０％丙酮沉淀的天门冬糖蛋白级份,它的β－消去反应产物在２４３ｎｍ有紫外吸收峰,表明其糖和蛋白质连接键为０－型糖肽键。凝胶层析测定ＡＧ－ｂ中多糖部分ＰＡ－Ｉ分子量为２．１９×１０６。１３ＣＮＭＲ波谱显示,ＰＡ－Ｉ具有α１→２、α１→４和α１→６三种糖苷键,不含有糖醛酸组份。ＩＲ光谱显示,ＡＧ－ｂ在１２５０ｃｍ－１和１７３０ｃｍ－１处有吸收峰,说明其含乙酰基团。     

诺卜乙基醚的氧化反应

由β-蒎烯合成了诺卜醇，再由诺卜醇合成了诺卜乙基醚。用高锰酸钾的碱性溶液氧化诺卜乙基醚，由于产物分离困难，故通过设计的路线得到主要产物的乙醇酯，经MS，IR，^1H NMR和^13C NMR分析后确定其结构为cis-2，2-二甲基-3-(β-乙氧基丙酰基)环丁烷乙酸乙酯。由GC-MS分析确定了8个产物的结构，为2，2-二甲基-3-(β-乙氧基丙酰基)环丁酮、cis-2，2-二甲基-3-(β-乙氧基丙酰基)环丁烷乙酸、3-羟基-cis-2，2-二甲基-3-(β-乙氧基丙酰基)环丁烷乙酸、1-羟基-cis-2，2-二甲基-3-(β-乙氧基丙酰基)环丁烷乙酸、2，3-二羟基诺卜乙基醚、5-羟基-2，3-环氧诺卜乙基醚、1-羟基-2，3-环氧诺卜乙基醚、1，5-二羟基-2，3-环氧诺卜乙基醚。结果表明：碱性高锰酸钾氧化诺卜乙基醚首先生成2，3-二醇，进一步继续氧化断裂得到环丁烷羧酸．或脱水后得到2，3-环氧化合物。     

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.