双核钌配合物的DNA键合及光断裂性能

合成了1个新型的双核钌配合物,并通过紫外-可见吸收光谱和荧光光谱滴定、热熔链、盐效应、黏度和凝胶电泳实验研究了其与小牛胸腺DNA(ct-DNA)之间的相互作用. 结果表明,由于主配体的位阻作用,该配合物通过部分插入模式与DNA键合,键合常数大于10⁶ L/mol;在365 nm紫外光照射下,该配合物能够断裂pBR322 DNA,是有效的DNA断裂试剂.     

多芳基咪唑CPD的合成及与G-四链体相互作用研究

以4-氟苯甲醛为起始原料，通过安息香缩合反应、氧化反应、亲核取代反应以及Debus-Radziszewski咪唑合成反应等步骤，合成得到了多芳基咪唑CPD.¹H NMR、¹³C NMR和HRMS确证其结构.紫外光谱实验和荧光光谱实验研究表明CPD对部分G-四链体具有一定的荧光识别作用，特别是可以识别c-myc G-四链体.单链DNA、双链DNA均不能使CPD的荧光产生增强，表现出较好的选择性.分子对接结果表明：CPD能堆积在G-四分体上，两条胺基侧链深入到G-四链体的负电性沟槽中，发生静电吸引作用，导致原有的分子构象发生变化，因而发射出荧光.     

杉木SRAP-PCR体系优化

为建立杉木SRAP-PCR反应体系,利用L₁₆(4⁵)正交设计对影响杉木SRAP-PCR反应体系的Mg²⁺、dNTPs、引物、Taq酶和DNA浓度5种因素的4个水平进行优化实验,结合正交直观分析和方差分析,对影响反应较大的Mg²⁺、dNTPs和引物浓度进行单因素实验,最终确定杉木SRAP-PCR最佳的反应体系为:在20 μL的PCR反应体系中,Mg²⁺浓度为2.25 mmol/L、dNTPs为0.15 mmol/L、引物浓度为0.4 μmol/L、Taq酶为1.5 μmol/min、模板DNA为60 ng,10×PCR Buffer 2 μL,不足部分用双蒸水补充至20 μL。PCR反应程序的两步最适退火温度第1步为35 ℃,第2步为53 ℃。利用上述反应体系进行杉木PCR扩增,能得到清晰、稳定的条带。     

新型咪唑并邻菲罗啉衍生物对人端粒G-四链体相对于双螺旋DNA的选择性识别

G-四链体DNA是抗肿瘤药物研究开发的重要靶点,选择性识别并稳定G-四链体DNA的化合物是潜在的抗肿瘤药物.文章利用紫外可见吸收滴定,荧光滴定,CD光谱以及荧光共振能量转移熔点实验(FRET-melring)研究了三个基于邻菲罗啉的新型衍生物(A,B和C)与人端粒G-四链体DNA的相互作用.结果表明三个化合物通过末端堆积方式与G四链体DNA相互作用,结合常数(K)约为106 mol-1·L.当浓度为3 μmol·L-1时,化合物A,B和C分别使G四链体DNA熔点温度增加(△Tm)16.2,10.5和10.9℃.而且在10倍过量双螺旋DNA存在下均能选择性识别并稳定G-四链体结构.     

配合物与G-四链体DNA相互作用的研究

端粒在维持基因组稳定、癌症和衰老相关的生理过程中发挥着重要作用,鸟嘌呤通过形成G-四分体平面堆积成G-四链体结构,DNA二级结构参与一些重要的生物调控过程。人们已经在生物体内发现G-四分体结构的存在,它们大量存在于基因的启动区域表明G-四链体可能参与调节基因表达。以G-四链体为新靶标设计能与G-四链体DNA相互作用的小分子,为开发抗癌药物提供了新途径。最近的许多研究证明金属配合物与G-四链体DNA具有有效的相互作用,有望开发成新的抗癌药物。     

药根碱与DNA G-四链体的相互作用研究

DNA单链(PS2.M)在K~+存在下可被诱导形成G-四链体。文章利用圆二色谱(CD)以及核磁共振光谱(NMR)表征了G-四链体的形成,并通过荧光滴定光谱、紫外滴定光谱以及核磁共振光谱研究了盐酸药根碱与G-四链体的相互作用。加入G-四链体后,药根碱在530nm处的荧光明显增强;紫外吸收光谱表现出减色和红移现象,说明药根碱可能堆积到G-四链体的尾部或者插入到G-四链体尾部的两个G-四分体之间形成夹心结构。由等摩尔连续变化法算出药根碱和DNA的结合比为1∶1,利用Scatchard方程计算出二者的结合常数为3.12×10~6 L/mol、结合位点为0.98。实验表明:盐酸药根碱与G-四链体有很强的相互作用,药根碱可以稳定DNA的G-四链体结构,二者的作用模式可能为末端堆积。     

光谱法研究卟啉-蒽醌化合物及其金属锌配合物与DNA的相互作用

用光谱法研究以二肽链连接的卟啉-蒽醌化合物及其金属锌配合物与DNA的相互作用.结果表明:卟啉-蒽醌化合物及其金属锌配合物与DNA发生外部结合.由紫外-可见光谱滴定数据进行拟合计算出卟啉-蒽醌化合物及其金属锌配合物与DNA相互作用的结合常数分别为2.2×105(mol/L)-1和6.7×105(mol/L)-1.     

罗汉果ISSR-PCR反应体系的建立

以罗汉果 ( Siraitia grosvenorii) DNA为材料 ,分析了模板 DNA,Mg2 + ,d NTPs,引物的浓度 ,Taq DNA聚合酶的用量以及循环次数对 ISSR-PCR扩增结果的影响 ,确立了稳定的、可重复的罗汉果 ISSR最佳反应体系和 PCR扩增参数 :在 2 5μL的 PCR反应体系中 ,含 2 0～ 5 0 ng模板 DNA,1 U Taq酶 ,1× PCR缓冲液 ,2 .0 mmol/L Mg Cl2 ,4种 d NTPs各 2 0 0 μmol/L,0 .5 μmol/L引物 ;PCR扩增程序为 94°C预变性 3 min,接着进行 40个循环 :94°C变性 1 min,5 2°C退火 5 0 s,72°C延伸 2 min,循环结束后 72°C延伸 7min.     

呫吨酮衍生物的合成及与G-四链体作用的研究

以邻羟基苯甲酸和间苯三酚为原料,通过一步法合成了1,3-二羟基咕吨酮,再经醚化、取代、季铵化反应得到化合物d,用IR、NMR、MS、元素分析等进行结构测定和表征,利用圆二色(CD)光谱和变温紫外-可见(UV-Vis)光谱研究了化合物d与G-四链体DNA的相互作用.CD光谱表明化合物d能诱导端粒DNA片段d[G3(T2AG3)3]形成反平行型的G-四链体结构;变温UV-Vis光谱显示化合物d使相应G-四链体DNA的Tm们值增加约6℃,表明化合物d同时起到稳定G-四链体的作用.     

希夫碱铜(Ⅱ)配合物的合成、表征及其与DNA的相互作用

用L-半胱氨酸、水杨醛和醋酸铜合成了一种新的希夫碱铜(Ⅱ)配合物(Cu(Ⅱ)L),并对其结构进行了表征;用荧光、黏度和电化学方法研究了该配合物与DNA的相互作用.结果表明,希夫碱铜(Ⅱ)配合物与DNA的作用模式是插入和吸附的混合模式,测得Cu(Ⅱ)L与CT DNA的键合常数是1.63×104L/mol.该配合物与单链DNA和双链DNA有不同的电化学性质,利用这种性质可以作为识别dsDNA和ssDNA的探针试剂.     

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.