支持向量机程序SVMProt预测SArs病毒蛋白质的功能

对SARS冠状病毒蛋白质功能的有效识剐将有利于促进SARS传染病治疗药物的开发。应用基于支持向量机原理的SVMProt程序识别SARS冠状病毒蛋白质的功能,通过对SARS冠状病毒中2个已知功能的蛋白质功能的成功预测,说明SVMProt能够有效地应用于SARS冠状病毒蛋白质及其他种类蛋白质的功能预测。对SARS冠状病毒中至今仍未知其功能的蛋白质ORFl3的功能进行了预测,结果显示ORFl3是一种可能与DNA结合的核蛋白并兼有病毒体内结构蛋白的功能。     

基于生物信息学与分子结构的SARS冠状病毒主蛋白酶(SARS CoV Mpro)多肽类抑制剂研究

用冠状病毒基因解析软件系统ZCURVE_CoY2．0，从SARS冠状病毒（TOR2，NC_004718）的RNA基因序列出发，搜索出含有SARS冠状病毒主蛋白酶（SARS CoV M^pro）真实剪切位点的11个八肽，运用分子叠合和分子对接的方法，对11个八肽进行了分析，证明这11个八肽有相似的活性，而且11个八肽中，op4的活性最高．分析认为，op4有望成为抗SARS药物的理想前体．     

DNA分析技术鉴别乌头初探

该文尝试建立一种利用DNA检验技术鉴别乌头的方法。通过提取50份乌头类及25份其他植物样本的DNA,用荧光特异性引物对乌头ITS2序列进行扩增,产物经3130XL测序仪进行检测分析,并进行测序入库比对。结果发现,试验中所有乌头类植物得到168bp的扩增产物,而其他对照植物均无扩增产物。由此表明,DNA分析技术对于鉴别乌头类与其他植物有一定的参考借鉴价值。     

线粒体连续超薄切片电镜图像的三维可视化

研究建立对连续超薄切片电镜图像的三维可视化方法。对正常及用SARS冠状病毒感染非洲绿猴肾细胞（VeroE6）样品进行连续超薄切片，通过透射电镜得到线粒体断层图像，用表面显示技术对线粒体进行三维重构显示。正常和SARS冠状病毒感染的VetoE6细胞中的线粒体在结构上有明显区别，揭示出SARS冠状病毒感染VeroE6细胞线粒体的病理改变。以此建立起电镜连续超薄切片线粒体图像三维可视化方法。     

葡萄病毒B优化检测体系的建立

为了解决种苗检疫、抗病性早期鉴定等基本问题,为葡萄无毒化栽培的提供基本保障。本实验从感染葡萄病毒B的葡萄皮层中提取总RNA,以其为模板进行一步RT-PCR扩增,并利用此扩增产物为模板进行二次扩增,二者均能获得与预期片段大小一致长约460bp和243bp的扩增产物,在此基础上,建立了萄病毒B的一步RT-PCR、巢式PCR以及斑点杂交优化检测体系。利用本实验所建立的优化检测体系对葡萄样本进行检测,表现出了良好的特异性与稳定性。     

微量植物组织汁液直接RT-LAMP可视化检测马铃薯卷叶病毒方法的构建

为建立快速的马铃薯卷叶病毒检测方法以应用于脱病毒后大规模样本的检测,构建利用微量植物组织汁液直接逆转录环介导恒温扩增(RT-LAMP)可视化检测马铃薯卷叶病毒的方法,即以无菌大头针的针尖刺马铃薯植株茎尖时所粘附的汁液直接作为RNA模板,采用Bacillus stearothermophilus(Bst) DNA聚合酶进行RT-LAMP扩增,扩增产物通过肉眼观察有无白色沉淀来诊断马铃薯卷叶病毒.该方法快速、操作简单、成本低,在大规模组织培养无病毒种薯生产中具有很大的应用空间.     

河北省新乐市羊梨形虫分子检测

为检测河北省新乐市羊梨形虫的感染情况,采集河北省新乐市羊血液样本31份,并提取基因组DNA;根据梨形虫18S rRNA基因序列设计5对特异性引物,以羊血液基因组DNA为模板,对梨形虫进行巢式PCR扩增。结果表明,在31份DNA样本中检测出4份吕氏泰勒虫(12.9%),而尤氏泰勒虫、中华泰勒虫和羊巴贝斯虫均未检测到阳性样本。     

马铃薯卷叶病毒基因组保守序列片段的RT—PCR扩增

从感染马铃薯卷叶病毒的植株中提取马铃薯卷叶病毒总RNA,针对马铃薯卷叶病毒基因组,其中的2个保守序列分别设计并合成了1对寡聚核苷酸引物,用反转录-聚合酶链式反应方法从提取的病毒RNA材料中扩增出符合设计大小的240bp、400bp的特异性产物,对照的健康植株中未扩增出相应产物。     

DNA短片段复合扩增系统鉴别大麻研究

通过提取大麻及其他对照植物样本的DNA,用荧光标记的特异性引物进行扩增,产物经3500XL测序仪进行检测分析,同时以理化LC-MS/MS分析方法和大麻性别检验法对样本进行检测,与DNA检测结果进行相互印证。结果发现,毒品大麻在93bp与157bp处检测到2条特异性扩增条带,而纤维大麻仅在93bp处检测出1条特异性条带,检测结果与大麻性别检验法得出一致结论,与理化LC-MS/MS分析方法得出的结果有差异。由此可见,该文建立的短片段复合扩增系统对于毒品大麻与纤维大麻的鉴别有一定参考价值。     

hTR基因反义表达质粒构建及序列分析

从人的脐带血管内皮细胞中提取基因组 DNA,通过 PCR方法扩增得到了人端粒酶RNA成分 ( human telomere RNA,h TR)的基因片段 ,扩增产物经酶切克隆到逆转录病毒载体p LNCX上 ,构建了 h TR基因的反义表达质粒 .序列分析结果表明 ,PCR扩增得到的 h TR基因的 DNA序列与所发表的序列完全一致 .构建的反义表达载体中的目的基因正确地反向插入到逆转录病毒载体 p LNCX的克隆位点上 ,构成了 h TR基因的反义表达质粒     

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.