亚硒酸钠溶液对SGC-7901细胞生长的影响

目的：研究亚硒酸钠溶液对SGC-7901细胞的影响．方法：运用细胞培养法、集落形成试验及分裂指数试验探讨亚硒酸钠对SGC-7901细胞的抑制作用．结果：亚硒酸钠溶液对SGC-7901细胞的生长曲线、集落形成、分裂指数有明显的影响，亚硒酸钠对生长曲线、集落形成及分裂指数的抑制作用与其浓度和时间呈正相关．结论：亚硒酸钠溶液对SGC-7901细胞的生长有抑制作用，其抑制作用与其浓度和时间呈正相关．     

嗜凤梨果蝇(Drosophila ananassae)细胞系的建立及其生物学特性初步观察

为建立真核基因表达受体系统,以嗜凤梨果蝇胚胎为材料,采用常规方法获取发育4～8h的果蝇胚胎细胞,以改良M3(BF)培养液体外培养,经40d左右的原代培养后行传代培养,以后每隔7d传代一次,传至10代时按照细胞系建立标准检测细胞系的一系列生物学特性.结果显示:细胞维持体外生长将近1年,传至60代.细胞在接种的0～96h内呈指数生长,临界增殖浓度为1.0×106个(细胞) mL.部分细胞染色体呈现异倍化.经液氮冻存的细胞复苏后活性达90%以上.该细胞系是一株成功的细胞系,命名为HY-ANA.     

鹿茸皮肤细胞系的建立及其部分生物学特性研究

本文报道了从培养的鹿茸皮肤组织块建立细胞系(定名为PAS—001)的方法。目前该细胞系已进行了30代培养。同时,对该细胞系的生长率、分裂指数、染色体组型以及不同培养基对其生长的影响也进行了观察和分析。     

条斑星鲽连续性鳍细胞系的建立与鉴定

为了建立条斑星鲽鳍细胞系,为其细胞工程及病毒学研究奠定基础,对经Ⅱ型胶原酶和透明质酸酶联合消化法所得鳍组织碎块分别用DMEM/F12、L-15和M199培养液(pH7.2)在18～26℃进行了鳍组织的体外培养,并在所筛选出的最适培养液和培养温度下通过添加羧甲基壳寡糖、碱性成纤维样生长因子(bFGF)和I型胰岛素样生长因子(IGF-I)启动了鳍细胞的原代培养。体外培养结果显示,条斑星鲽鳍细胞的最适培养液为DMEM/F12培养液,最适培养温度为22℃,原代培养鳍细胞的生长分裂状态旺盛,细胞形态主要为成纤维样,20d后便可形成汇合细胞单层,经过连续的继代培养已建立了条斑星鲽的连续性鳍细胞系,目前已传至第135代;生长特性检测结果显示,第60代鳍细胞系细胞的群体倍增时间为56.9h,其生长分裂状态依然十分旺盛;染色体分析结果显示,第60代鳍细胞系细胞虽然出现了染色体的非整倍性,但其特征性染色体数目仍为46条,并具有2sm+44t的正常二倍体核型,证明所建立的细胞系确为条斑星鲽连续性鳍细胞系。该细胞系为条斑星鲽的细胞工程育种和病毒-细胞相互作用提供了一个理想的体外研究体系,具有重要的理论意义和应用价值。     

人牙龈成纤维细胞的体外培养及生长曲线测定

目的:体外培养正常人牙龈成纤维细胞并测定其生长曲线,初步了解该细胞生物学特性.方法:用改良组织块法培养人牙龈成纤维细胞,通过MTT比色法研究细胞的生长曲线.结果:改良组织块法原代培养细胞成活率达80%,培养细胞呈梭形,从第3天呈对数生长,第4-5天进入平台期.结论:改良组织块法能简便快速地获得人牙龈成纤维细胞,初步了解其生物学特性.     

胎鼠心肌与肝脏细胞的体外生长特性

用M199和DMEM两种培养液分别培养取自14～16日龄胎鼠的心肌、肝脏组织细胞.通过观察细胞生长情况、进行细胞计数和绘制细胞生长曲线,对不同组织细胞的生长特性进行了比较.结果表明:在相同的体外培养条件下,胎鼠心肌细胞的整体长势良好,贴壁情况和增殖速度都较佳,有望成为胚胎干细胞饲养层的首选材料.     

Ca^2＋离子对蒜根生长和细胞分裂的影响

用不同浓度（100－400mg/L)的Ca(NO3)2溶液处理蒜鳞茎,研究对蒜根生长和有丝分裂的影响。结果表明：随着Ca^2 浓度的增大,有丝分裂指数先升后降（200mg/L最大）,随时间延长分裂指数升高,但400mg/L时则相反。核异常细胞比率随浓度增加而增加,随时间延长而减少,核异常的突出表现为染色体解体在各浓度时间内普遍发生。本实验结果显示：Ca^2 对细胞分裂和细胞核的影响与重金属有很大差别。     

胎牛成纤维细胞的分离培养

应用组织块培养法从胎牛耳部分离培养了胎牛成纤维细胞。应用PCR方法鉴别了细胞的性别。选择雌性成纤维细胞,进行了形态观察、生长曲线测定、染色体分析。结果表明,分离培养的细胞具有正常的大小、形态、分裂增殖特性和染色体数目。胎牛成纤维细胞的培养方法的建立以及其相关的生物学特性的分析,有利于给同种和异种体细胞克隆牛研究提供形态良好、染色体数目正常的供体细胞,同时也为体细胞转基因等其他领域的研究提供了基础条件。     

杂种鹅掌楸体胚苗根尖染色体核型分析

分别采用冰水混合物、0.7 mmol/L环己酰胺和0.2%秋水仙素3种试剂,在多个时间梯度对生长旺盛的杂种鹅掌楸体胚苗根尖进行预处理,并采用压片法进行制片观察。结果表明:采用冰水混合物处理6 h,0.7 mmol/L环己酰胺处理2 h,0.2%秋水仙素处理4 h,均可获得较多的根尖细胞中期分裂相。相比较而言,采用环己酰胺和秋水仙素作为预处理试剂获得的染色体形态较好。利用0.7 mmol/L环己酰胺对鹅掌楸根尖染色体进行2 h的预处理后,采用卡宝品红压片法制片进行染色体核型分析的结果显示,杂种鹅掌楸染色体为38条,核型公式为2n=38=26m+8sm+2st+2t,核型属于2B型。     

人视网膜色素上皮细胞生长特性及可见光对其影响

 研究体外培养的人视网膜色素上皮细胞的生长特性及可见光对其影响.用倒置相差显微镜和透射电镜观察人视网膜色素上皮(hRPE)细胞形态和超微结构,用计数法和噻唑蓝(MTT)法绘制生长曲线.从光照时间、光照时有无血清、光照后是否换液、光照后培养时间这4方面考查可见光对hRPE细胞的损伤情况.实验结果表明,体外培养的hRPE细胞为多角形,有极性,细胞器正常,生长旺盛.(8423±359)lx的可见光光照2h就能对hRPE细胞造成显著损伤.光照时间为5h,光照时培养液中含10%胎牛血清,光照后不换培养液,光照后培养时间为24h,此条件下hRPE损伤率为58%.体外培养的hRPE细胞具有正常的形态结构和生长规律.可见光可对hRPE细胞造成损伤,并且损伤程度有时间积累效应.因此,在日常生活中应尽可能避免阳光直射,减少光照时间,以降低视网膜光损伤发生率,保护眼睛.     

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.