萼花臂尾轮虫(Brachionus calyciflorus)的ISSR引物筛选及其多态性检验

采用简单重复序列区间(ISSR:一种基于微卫星的分子标记,无需预知遗传背景即可研究基因组中微卫星序列的变异,适合大规模的种群遗传研究)的方法对萼花臂尾轮虫(Brachionus calyci florus)进行PCR扩增,优化出适宜的ISSR-PCR反应体系,并从100条引物中筛选出16条具有良好多态性和重复性的ISSR引物.研究结果显示,萼花臂尾轮虫简单重复序列以(AC)和(AG)的两碱基重复为主,筛选出的ISSR引物扩增共得到114个位点,66个多态位点,多态性高达57.89%,高于常用于该物种分子生态学研究的线粒体COI基因的多态性.     

川西北高原野生垂穗披碱草遗传多样性的ISSR分析

采用ISSR分子标记技术对25份来自川西北高原的野生垂穗披碱草(Elymus nutans Griseb.)种质进行遗传多样性研究.研究结果如下:(1)筛选出10条ISSR引物对25份材料共扩增出120条清晰的条带,其中多态性条带85条,多态性条带比率为70.8%;每条引物扩增条带数变化为9-17条,平均每条引物总扩增的带数为12条,其中多态性的条带数变幅为3-16条,平均每条引物的多态性条带数为8.5条.(2)供试的25份垂穗披碱草种质间的遗传相似系数变幅为0.703-0.974,平均值为0.828,供试材料间表现出了丰富的遗传多样性.(3)基于遗传相似系数对供试材料进行了聚类分析和主成分分析,聚类分析结果可以将供试的野生垂穗披碱草种质资源分明显分成3类,聚类分析结果与材料的地理来源间具有一定的相关性.     

青花菜种质的ISSR分子标记研究

利用ISSR标记对14份青花菜材料和1份油菜参照材料进行了基因组多态性分析,从60条引物中筛选出12条可扩增出清晰且具多态性条带的引物.共扩增出108条带,其中84条具有多态性,多态性百分率为77.78%,被测材料的ISSR标记多态性较高.其中每条引物可扩增出4~17条多态性带,平均7条.ISSR标记遗传相似性系数(GS)变异范围为0.531 2~0.859 4,平均值为0.744 4±0.073 4.通过UPGMA进行聚类分析,青花菜材料和油菜参照材料彼此间区分明显,14份青花菜材料聚为2类.结果表明,ISSR标记可以有效地评价青花菜遗传分化并为青花菜种类的鉴别提供一定的理论依据.     

辣木植物ISSR分子标记的初步研究

对从7个不同地方采集的7份辣木(Moringa)材料进行了ISSR 标记分析.结果表明,被测材料间ISSR标记多态性较高.从18个ISSR 引物中筛选出6个可扩增出清晰的且具多态性的条带的引物,共扩增出75条带,其中59条具有多态性, 占总扩增带数的78.67 %,其中每个引物可扩增出4～14条多态性带,平均10.17条.ISSR 标记遗传相似性系数(GS) 变异范围为0.557 0～0.836 7,平均值为0.687 6±0.080 9.聚类分析表明,7份辣木材料可以聚为四类,其中MS2为单独一类.ISSR 标记可以有效地评价辣木植物遗传分化并为辣木种类的鉴别提供一定的理论依据.     

濒危植物长叶红砂ISSR扩增条件的优化与引物筛选

对濒危植物长叶红砂(Reaumuria trigyna Maxim)的核基因组DNA进行ISSR扩增条件的优化与引物筛选.利用单因素实验,测试了ISSR-PCR反应体系中模板DNA的含量、引物浓度、Master Mix等因素对反应结果的影响,经过优化实验,建立了长叶红砂ISSR-PCR的最佳反应体系,15μL PCR反应体积包括Mix 4.5μL,模板DNA 20ng,引物0.6μmol/L.利用优化反应体系,从60个ISSR引物中筛选出稳定性好、重复性高的14个引物.对长叶红砂5个种群的85个个体进行扩增,共扩增出110个位点,其中多态位点102个,多态位点百分率为92.73%.长叶红砂ISSR反应体系的建立为利用ISSR分子标记技术进一步研究长叶红砂的遗传多样性奠定了良好的基础.     

青海地方核桃单株遗传关系的ISSR分析

采用ISSR分子标记的方法,对青海地方核桃品种单株进行了遗传关系研究。实验从30条ISSR引物中筛选出4条进行电泳分析,使用NTSYS pc 2.11F和Popgene 1.32软件进行数据统计分析并作图。结果表明:4条ISSR引物共获得40条谱带,平均每条引物10条谱带,引物平均多态带比率82.5%;4条ISSR引物可将所有样品完全分开,当遗传相似性阈值为0.736时可将样品分成7组。样品间的遗传相似性系数为0.550~0.975(平均0.763)。由于长期的自然变异和选择,青海地区核桃积累了较高的遗传多样性,单株间存在不同程度的亲缘关系。     

基于ISSR标记的5个南京椴种群的遗传多样性分析

采用ISSR标记技术分析了5个南京椴种群共147单株的遗传多样性。从55条简单重复序列引物中筛选出11条多态性引物，共扩增出80条带，其中76条多态性带，多态性比率为95.00%，平均每条引物可扩增出7.0条带。南京椴Shannon多样性指数变化范围为0.211 7~0.322 7，物种水平多样性为0.407 7；Nei基因多样性为0.140 5~0.211 9，物种水平为0.264 3；有效等位基因数的变异范围为1.240 3~1.356 6，物种水平的有效等位基因数为1.432 6。AMOVA遗传变异巢式方差分析结果表明种群间变异占总变异的34.99%，种群内个体间的变异占总变异的65.01%，约为群体间变异的2倍，说明南京椴群体内个体间的变异在其遗传变异中占主导地位。遗传变异分析表明：种群内和种群间的变异系数分别为0.257 1和0.176 0；物种水平的基因分化系数为0.315 4，种群间的基因流Nm为1.085 5。基于遗传相似系数的UPGMA聚类分析将5个种群明显聚为3支。     

棉花种质资源多样性的ISSR聚类分析及主成分分析

利用ISSR分子标记对48份棉花种质资源的亲缘关系及遗传多样性进行分析,结果显示,筛选出的10个ISSR引物扩增出的112条带中,多态性条带占101条,为总条带的90.18%.每个引物均可扩增4～21个多态性位点,平均10.10个,引物平均多样性信息指数(PIC)和多态性谱带百分率(PPB)分别为0.76和87.88%.利用NT-SYSpc 2.1统计分析软件中的UPMGA法对48份棉花种质资源构建亲缘关系树状图,在遗传相似性系数(GS)为0.66水平上可将所有参试材料聚成两大类,且与主成分分析(PCA)结果基本吻合.ISSR标记揭示出这48份棉花种质资源遗传多样性较小,遗传基础比较狭窄.     

大蒜种质资源遗传多样性的分子标记研究

本研究利用RAPD和ISSR两种分子标记技术,对中国10个不同地区的大蒜品种进行了种质资源遗传多样性研究.从30个RAPD引物当中,筛选出11个具有多态性的引物,共扩增出多态性带224条,多态性条带比率为41.18%,从12个ISSR引物中筛选出5个具多态性的ISSR引物,共扩增出多态性带121条,多态性条带比率为50.21%.对RAPD和ISSR两种标记分别运用Nei指数法,计算出10个大蒜品种的平均遗传距离为0.28和0.32.根据这两种标记的结果,采用UPGMA进行聚类分析,得到与生物学分类地位基本一致的结果.结果表明,在实验稳定性上,ISSR优于RAPD,且ISSR比RAPD能检测到更多的遗传变异,RAPD和ISSR两种标记可用于大蒜种质遗传多样性的研究.     

应用ISSR分子标记探讨酵母菌种间亲缘关系

从27条简单重复序列区间(ISSR)引物中筛选出10条引物对19株酵母菌进行PCR扩增;采用正交试验设计方法,对ISSR的影响因素进行了研究,对Taq酶,Mg2+,dNTP和引物进行了4因素3水平优化试验,再通过对退火温度和模板DNA浓度的筛选,得出ISSR-PCR扩增的最佳反应体系.10条引物共扩增出108条带,其中90.7%呈多态性,相似系数为0.48~1.00.     

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…     

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.     

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)

正~~     

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.