长毛对虾酸性磷酸酶的纯化与性质

分别从健康和患病长毛对虾（Ｐｅｎａｅｕｓｐｅｎｉｃｉｌａｔｕｓ）肌肉提取一种酸性磷酸酶（ＡＣ－Ｐａｅ，ＥＣ．３．１．３．２．），进一步用硫酸铵分级分离，ＳｅｐｈａｄｅｘＧ－２００柱纯化，经聚丙烯酰胺凝胶电泳，并于ＢｅｃｋｍａｎＤＵ－８Ｂ紫外分光光度计扫描为单一区带酶液。该酶紫外吸峰在２８０ｎｍ处，荧光激发峰在２８４ｎｍ处，发射峰在３４７ｎｍ处。酶的分子量为７３０００道尔顿，等电点为４．７酶水解对硝基苯磷酸二钠（ＰＵＰＰ）最适ｐＨ为４．５，最适温度４０℃。健康虾与病虾酶的活化能分别为４１．０３ｋＪ／ｍｏｌ·Ｌ和４５．７８ｋＪ／ｍｏｌ·Ｌ，米多常数ｋｍ值分别为０．８０×１０－４ｍｏｌ／Ｌ和１．４３×１０－４ｍｏｌ／Ｌ。重金属离子Ｃｕ２＋，Ｈｇ２＋，有机溶剂甲醇，乙醇，乙二醇等对ＡＣＰａｓｅ有明显的抑制作用。     

福寿螺β-葡萄糖苷酶的分离纯化及性质的初步研究

以福寿螺内脏为材料,经本实验室开发的工业生产法制备粗酶粉,进一步采用葡聚糖凝胶（ＳｅｐｈａｄｅｘＧ－２００）和ＤＥＡＥ－ＳｅｐｈａｄｅｘＡ－５０柱层析纯化,获得经ＳＤＳ－聚丙烯酰胺凝胶电泳鉴定为单一纯的β－葡萄糖苷酶制剂．测定该酶的最适反应温度为４３℃,最适反应ｐＨ为５．１;在ｐＨ５．１,４５℃下,该酶催化水杨素水解的Ｋｍ值为３．４０ｍｍｏｌ／Ｌ,活化能为５０．６３ｋＪ／ｍｏｌ．研究几种效应物对酶活力的影响,结果表明：Ｍｎ２＋、Ｃｏ２＋对酶有激活作用,而Ｃｕ２＋、Ｈｇ２＋、Ｐｂ２＋、ＳＤＳ及脲对酶有不同程度的抑制作用,其中Ｃｕ２＋和Ｈｇ２＋对该酶的抑制作用最强,其抑制机理均表现为非竞争性抑制     

吸光度线性扩展法测定镨钕钐

用吸光度线性扩展法测定镨、钕、钐．基于待测元素特征吸收峰下的吸光度在纪录仪上线性放大，提高了测定的灵敏度、准确度，扩大了测定浓度范围．分别选用的最大吸收波长是：λＰｒ＝４４４．７ｎｍ，λＮｄ＝７９４．２ｎｍ，λＳｍ＝４０１．７ｎｍ；吸光度相应峰高和浓度呈线性关系的范围是：Ｐｒ３＋为（０．２０～８．６）×１０－６ｍｏｌ／Ｌ；Ｎｄ３＋为（０．２０～２．４）×１０－６ｍｏｌ／Ｌ；Ｓｍ为（０．２０～３．０）×１０－５ｍｏｌ／Ｌ．在选用１０ｃｍ比色皿时，测定灵敏度为：Ｐｒ３＋为１．１μｇ／ｍｌｍｍ，Ｎｄ３＋为０．２２μｇ／ｍｌｍｎ，Ｓｍ３＋为４．６μｇ／ｍｌｍｍ．待测元素与稀土杂质浓度比为５１时无干扰，１１时只有个别元素有一定干扰．     

依诺沙星的电化学研究

依诺沙星在Ｂｒｉｔｔｏｎ－Ｒｏｂｉｎｓｏｎ缓冲液（ｐＨ２．０～１１．０）中产生两个极谱还原峰。两峰强烈地受溶液ｐＨ值的影响，峰Ⅰ（－１．ＩＶ～－１．５Ｖｖｓ．ＳＣＥ）对应于吡啶环的双电子还原，峰Ⅱ（１．５伏～－１．７伏ｖｓ．ＳＣＥ）对应于羰基的还原。实验表明电极过程是受扩散控制的不可逆过程，并测定了ｎ，ａ和Ｄ０的值。当ＰＨ＝２．２时，峰Ⅰ的峰电流与依诺沙星的浓度在４．０×１０－８～６．０×１０－６ｍｏｌ／Ｌ之间有线性关系，检测限为２．５×１０－８ｍｏｌ／Ｌ，可用于依诺沙星的检测。     

钼－桑色素配合物的极谱波研究与应用

在ｐＨ２．１的硫酸－２．９６×１０－６ｍｏｌ／Ｌ桑色素－０．１７２ｍｏｌ／Ｌ氯酸钾底液中，钼在－０．４３Ｖ（ＳＣＥ）有一灵敏的极谱催化波，可用于测定微量钼．线性范围１．０４×１０－９～２．５０×１０－８ｍｏｌ／Ｌ，检出限１．８８×１０－１０ｍｏｌ／Ｌ．　极谱催化波法直接应用于三氧化钨光谱标样中微量相的测定，方法简便，准确可靠。     

磷酸盐及其结构类似物对文昌鱼酸性磷酸酶的影响

研究了磷酸盐（ＨＰＯ￣（２－）＿４）及其结构类似物钼酸盐（ＭｏＯ￣（２－）＿４），钒酸盐（ＨｖＯ￣（２－）＿４），钨酸盐（ＷＯ￣（２－）＿４）对文昌鱼酸性磷酸酶活力的影响及其抑制机理。实验结果表明：磷酸盐对文昌鱼酸性磷酸酶的抑制作用表现为竞争性抑制类型，而其结构类似物则是通过非竞争性抑制的方式抑制酶活力．抑制常数Ｋｉ分别为：磷酸盐：３．０×１０￣（－４）ｍｏｌ／Ｌ，钼酸盐：５．５×１０￣（－７）ｍｏｌ／Ｌ，钒酸盐：７．０×１０￣（－７）ｍｏｌ／Ｌ，钨酸盐：３．８×１０￣（－８）ｍｏｌ／Ｌ，用酸盐对酶活力呈时间抑制过程，表明该类似物可能通过氧化—还原这种新的抑制机理来抑制酶的活力。     

Tb(Ⅲ)荧光探针测定肾上腺素

肾上腺素（ Ｅ） 与 Ｔｂ３ ＋ 在ｐ Ｈ ６ ．６ ～７ ．２ 条件下能形成较强的荧光络合物,其激发峰在３０５ ｎ ｍ ,发射峰在４９４ ｎ ｍ 和５４５ ｎ ｍ 处,肾上腺素在８ ．２ ×１０ － ８ ～９ ．８ ×１０ － ５ ｍｏｌ／ Ｌ 范围内与其荧光强度呈线性关系,检出限为２ ．２５ ×１０ － ８ ｍｏｌ／ Ｌ．并将其用于样品中肾上腺素的测定     

溶菌酶的极谱催化氢波研究与应用

在０．３６ｍｏｌ／ＬＮＨ４Ｃｌ－０．０４ｍｏｌ／ＬＮＨ３Ｈ２Ｏ（ｐＨ８．３１）支持电解质中,溶菌酶（ＬＥ）产生一个极谱催化氢波,峰电位为－１．８０Ｖ（ｖｓ ＳＣＥ）．该极谱催化氢波二阶导数峰电流与ＬＥ浓度在 １．２ × １０－８－５．６ × １０－８ｍｏｌ／Ｌ范围内有线性关系．用于鸡蛋清中ＬＥ的测定,结果满意．     

锌—色氨酸配合物的吸附伏安特性及其应用

研究了锌－色氨酸－硼砂体系的吸附伏安特性．在０．０１ｍｏｌ／Ｌ硼砂底液中（ｐＨ＝９．５），锌－色氨酸配合物在－１．１５Ｖ（ＶＳ．ＳＣＥ）出现一灵敏吸附还原峰．通过对该峰的性质及反应机理的研究，确认此峰为配合物吸附还原峰，吸附反应物为锌与色氨酸形成的１∶２配合物，电极反应为二电子还原，在合适的条件下，该还原峰峰高与锌浓度在１．０×１０－７～７．５×１０－６ｍｏｌ／Ｌ范围内成线性关系，检测下限为１．５×１０－８ｍｏｌ／Ｌ，用此法测定生物样品中的微量锌，得到满意结果     

维生素K3的电化学研究

采用单扫示波极谱法，ＶＫ３在０．１ｍｏｌ／ＬＮａＣｌ底液中，于－０．４６Ｖ（ＳＣＥ）处有一良好的二阶导数峰，峰高与浓度在５×１０－７～２×１０－５ｍｏｌ／Ｌ范围内成线性关系，检测限为２．５×１０－７ｍｏｌ／Ｌ．当ｐＨ值小于３．６０时，ＶＫ３与氢离子作用，于零伏左右有一准可逆的２ｅ－＋Ｈ＋波；当ｐＨ值大于３．６０时，用低扫速的卷积伏安法观察，可发现ＶＫ３有双锋，说明有反应中间体存在，在水合介质中其反应机理是可逆的逐级双电子过程．此外，还对底液中溶解氧的影响进行了讨论．     

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.