粉被虫草菌丝体多糖的分离纯化及其性质

粉被虫草菌丝体经沸水浸提，醇析，透析，Ｓｅｖａｇｅ法脱蛋白，再经ＤＥＡＥ－纤维素和Ｓｅｐｈａｄｅｘ－Ｇ－１００柱层析纯化，得菌丝体纯多糖ｐｓ１和ｐｓ２．高效液相色谱（ＨＰＬＣ）检测ｐｓ１和ｐｓ２的为单一物质，凝胶过滤法测得ｐｓ１和ｐｓ２的分子量分别为２４０００和１３０００Ｄａｌ，气相色谱分析表明ｐｓ１的单糖组分有Ｄ－甘露糖，Ｄ－葡萄糖和Ｄ－半乳糖，ｐｓ２的单糖组分有Ｄ－甘露糖和Ｄ－葡萄糖，ＩＲ分析     

树舌、茯苓多糖的提取分离及组成

对树舌(Ganoderma apparatus)、茯苓(poria cocos)多糖的提取、纯化和单糖的组成成分进行了研究.认为树舌子实体和茯苓菌核经热水提取、脱色和乙醇沉淀分别得到相应多糖(树舌多糖Ga,茯苓多糖Pc)粗品,多糖粗品经脱蛋白,乙醇分级沉淀、Sephadex G-15葡聚糖凝胶柱层析纯化得Ga-1、Ga-2、Ga-3和Pc -1、Pc -2、Pc -3 3个级分,并应用薄板层析技术,确定树舌多糖3个级分均由葡萄糖、树胶醛糖、甘露糖、果糖及一种未知单糖组成,茯苓多糖3个级分均由葡萄糖、甘露糖、核糖及一种未知单糖组成.     

柑桔皮中果胶多糖的提取和化学成分的研究

用改良的盐析法柑桔皮中提取果胶多糖，经ＤＥＡＥ－纤维素柱层析后分离出４种不同组分的果胶多糖。多糖经酸醇解后，分别用气相色谱和薄层层析分析其单糖组成成分。实验表明，４种不同组分果胶多糖其单糖的含量都不相同，其中半乳糖醛酸变化范围为８１．８５％－６７．４５％〈变动值较小。     

白芨多糖分离、纯化、组成及其性质

水提白芨多糖,用甲醇分级沉淀和 DEAE—纤维素柱层析得5个组分。B-1,B-2,B-3,B-4,B-5和 BS。经玻璃纤维纸电泳、醋酸纤维薄膜电泳和琼脂糖4B 凝胶柱层析鉴定,表明 B-1和 B-2两种组分均为单一物质。B-1和 B-2的比旋度均为负值。Dische 法测定麦明,白芨多糖不含糖醛酸。红外光谱和核磁共振测定分析显示,白芨多糖糖苷键型为β型。纸层析、薄板层析及气相色谱分析表明白芨多糖由甘露糖和葡萄糖两种单糖组成,相对 Rf 值之比约为1.11:1     

灵芝菌发酵产物中多糖组分的分离与性质研究

从灵芝的发酵产物中提取到水溶性多糖，经乙醇分级，重结晶纯化得到多糖组分ＧＰ，由凝胶过滤，琼脂糖电泳证明为化学均一性多糖，分子量约为２．９×１０＾４，将多糖组分ＧＰ水解后，用纸导析分析鉴定出由三种单糖组成：葡萄糖，木糖和甘露糖，此外，对纯多糖组分还进行了比旋度，熔点，紫外与红外光谱的性质测定。     

铁皮石斛多糖的分离纯化及其结构研究

采用DEAE-52阴离子交换柱色谱法以及Sephadex G-100凝胶柱色谱法对铁皮石斛粗多糖进行分离纯化,得到4个不同相对分子质量(Mw)纯多糖组分(DOP1、DOP2、DOP3和DOP4)。运用柱前衍生化高效液相色谱法、凝胶渗透色谱(GPC)法和傅立叶红外光谱对其单糖组成、纯度和相对分子质量以及结构中单糖连接方式进行分析。研究结果表明:分离得到的4种铁皮石斛多糖的GPC色谱图均呈现为单一狭窄的对称峰,表明多糖纯度很高且均一性很好。单糖组成测定结果显示其主要为D-甘露糖和D-葡萄糖组成杂多糖,但D-甘露糖和D-葡萄糖的摩尔比在4种多糖中有一定差异性。红外光谱结果表明这四个多糖均为β-构型为主的酸性吡喃糖。研究结果可为今后铁皮石斛多糖活性和构效关系的研究奠定基础。     

薯蓣多糖的分离、纯化、组成及其某些性质

中药薯蓣(Dioscorea Opposita)块茎经冷水,热水分别浸提的产物,通过脱蛋白,丙酮分级沉淀,高速离心和凝胶柱层析得到一系列性质各异的多糖。纸层析、气相色谱的结果表明热提物多糖主要由葡萄糖组成,而冷提物多糖由甘露糖组成。kunz法测得冷提物级分PF-Ⅲ和PF-Ⅳ分别含有15.6％和8.3％的乙酰基团。红外光谱显示热提物级分为α构型,而冷提物多糖为β构型。     

沙蒿多糖分离纯化和理化分析

利用水提醇沉法从白沙蒿子中提取多糖;Sevage 木瓜蛋白酶法脱蛋白,ultrahydrogelTM500(7.8×300 mm)凝胶柱层析进行分离纯化;琼脂糖电泳进行纯度检查;苯酚-硫酸法测定总糖含量;UV法及IR法检测多糖性质;自动旋光仪测定旋光度;离子色谱鉴定多糖的单糖组分.结果表明,沙蒿多糖为均一组分,纯度为96.5%,比旋光度为 90°,还原性多糖.经离子色谱分析,沙蒿多糖由阿拉伯糖、木糖、来苏糖、甘露糖、葡萄糖、半乳糖组成,且物质的量之比为1∶4.98∶1.69∶27.86∶3.76∶13.92.     

TLC与GC法测定红薯叶多糖的单糖组成

去蛋白后的红薯叶多糖,经Sephadex-G100凝胶层析法纯化后,利用薄层色谱法结合酸水解,糖腈乙酰化气相色谱分析法测定红薯叶多糖的单糖组成和各组成的物质的量比.结果表明:红薯叶多糖的单糖组分有木糖(Xyl)、甘露糖(Man)、葡萄糖(Glu),其量的比0.47:0.35:0.18.     

碱提虎奶菇菌核多糖的分离纯化及结构分析

采用热碱浸提法从虎奶菇菌核中提取多糖,经醇沉、离心、透析、浓缩、冷冻干燥,得到虎奶菇菌核碱提粗多糖.通过DEAE—52纤维素柱层析,Sephadex G—150柱层析纯化,得到虎奶菇菌核碱提多糖(Pleurotus tuber-regium(Fr.)Sing Sclerotium polysaccharide,简称PP1).经紫外分光法和高效液相色谱(HPLC)检测PP1为均一多糖,并计算出PP1的分子质量为5.96×105 Da.对PP1进行高碘酸氧化,Smith降解,通过气相色谱(GC)、红外光谱(IR)对其结构进行分析,得出PP1的单糖组成中仅有葡萄糖,化学结构是以β-D-吡喃葡萄糖为单元连接的多糖.     

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.     

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.