几种沙生植物光合碳代谢途径关键酶的研究

研究了分布于甘肃省临泽地区的沙拐枣、珍珠、霸王、泡泡刺、胡杨等５种沙生植物的光合酶：果糖－１．６－双磷酸酯酶（ＦＤＰａｓｅ）、１．５－二磷酸核酮糖羧化酶（ＲＵＢＰｃａｓｅ）、磷酸烯醇式丙酮酸羧化酶（ＰＥＰｃａｓｅ）、ＮＡＤ－苹果酸脱氢酶（ＮＡＤ－ＭＤＨ）活性的季节变化。结果表明，珍珠和沙拐枣的ＦＤＰａｓｅ酶活性远低于其它几种材料；珍珠、霸王、沙拐枣的ＰＥＰｃａｓｅ活性明显高于其它两种材料；珍珠、沙拐枣的ＮＡＤ－ＭＤＨ活性明显高于其它三种材料。可见，珍珠、霸王是ＣＡＭ植物，沙拐枣是Ｃ４植物，胡杨是Ｃ３植物，泡泡刺有可能在干旱协迫下由Ｃ３向Ｃ４或ＣＡＭ途径转化。     

文昌鱼酸性磷酸酶在甲醇溶液中的构象与活力变化

文昌鱼酸性磷酸酶（ＡＣＰａｓｅ，Ｅ．Ｃ３．１．３．２）是一种含有铁离子的金属酶，其可见光谱中５００ｎｍ的吸收峰以及荧光５１５ｎｍ的发射峰为该酶分子含铁的特征峰，与酶活力关系密切．通过荧光发射光谱和紫外可见光谱对该酶在不同浓度甲醇溶液中的构象与活力变化进行研究．不同浓度（Ｖ／Ｖ）的甲醇对酶活力有明显的抑制作用，动力学分析表明甲醇对酶的抑制为非竞争性抑制，其抑制常数为２０％．还研究了在甲醇存在下ＡＣＰａｓｅ活力中心的构象与活力变化，结果表明其构象变化快于活力变化．     

Paecilomyces inflatus生理特性的研究

本文报道了Ｐａｅｃｉｌｏｍｙｃｅｓ ｉｎｆｌａｔｕｓ的生理特性及ＡＴＰａｓｅ，ＰＯＤ的同工酶和ＣＯＤ的测试结果，并对该菌在养殖水体中的生理效应作了初步研究。     

氧化-硫化焙烧法处理高砷矿物原料的研究

对氧化物体系Ｃｕ－Ａｓ－Ｏ,Ｆｅ－Ａｓ－Ｏ和硫化物体系Ｃｕ－Ａｓ－Ｓ,Ｆｅ－Ａｓ－Ｓ的热力学分析表明,热力学稳定的砷化物为Ｃｕ３Ａｓ,Ｃｕ３（ＡｓＯ４）２,ＦｅＡｓ２,ＦｅＡｓＯ４．当有硫化剂存在时,在弱氧化气氛下进行氧化－硫化焙烧,将有利于ＦｅＡｓＳ分解,并生成毒性低的砷硫化物．分别在含金砷精矿和含砷铜精矿中添加黄铁矿进行沸腾焙烧工艺试验,砷的挥发率都在８５％以上,试验结果对高砷矿物原料脱砷工艺具有应用价值．     

硫钝化对Fe、Co/GaAs(100)界面形成和磁性质的影响

利用同步辐射和铁磁共振研究了经硫代乙酰胺硫钝化处理的ＧａＡｓ（１００）表面生长的Ｆｅ，Ｃｏ超薄膜与衬底的界面形成及磁性。实验结果表明，硫钝化能阻止Ａｓ向Ｆｅ，Ｃｏ超薄膜扩散，减弱Ａｓ和Ｆｅ，Ｃｏ的相互作用并增强在ＧａＡｓ（１００）表面生长的铁磁金属薄膜的磁性。     

TOTAL CONTENTS OF JOURNAL OF NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS(NATURAL SCIENCE)

20 0 1　　Ｖｏｌ.2 1　　Ｎｏ .1～ 4Ｎｏ .1ＰｅｒｆｏｒｍａｎｃｅＡｎａｌｙｓｉｓｏｆＭＣ ＣＤＭＡＣｈａｎｎｅｌＥｑｕａｌｉｚａｔｉｏｎＴｅｃｈｎｉｑｕｅｓＪＩＡＮＧＫｕｎ ,ＣＨＥＮＺｈｏｎｇ ｗｅｎ ,ＺＨＡＮＧＬｉ ｊｕｎ　 (1)…………ＡＳｔｕｄｙｏｎｔｈｅＩｍｐａｃｔｏｆＩｎｔｅｒｌｅａｖｅｒｏｎｔｈｅＰｅｒｆｏｒｍａｎｃｅｏｆＴｕｒｂｏＣｏｄｅｓＺＯＵＸｕｅ ｌａｎ ,ＦＥＮＧＧｕａｎｇ ｚｅｎｇ　 (9)…………………ＡＨｅｕｒｉｓｔｉｃＡｌｇｏｒｉｔｈｍｆｏｒＣｏｎｓｔｒｕｃｔｉｎｇＭｉｎｉｎｕ…     

中国对虾肌动球蛋白变性后ATPase活性的研究

在中国对虾肌动球蛋白经冷冻变性和热变性后，对Ｃａ＾２＋－ＡＴＰａｓｅ、Ｍｇ＾２＋－ＡＴＰａｓｅ活性及蛋白质溶解度进行了研究。冷冻变性之后，肌动球蛋白Ｃａ＾２＋－ＡＴＰａｓｅ活性呈逐渐下降趋势，一般贮藏温度越低，活性降低超快。     

厦门西港沉积物中有机氯化合物对碱性磷酸酶活力的影响分析

厦门西港沉积物中碱性磷酸酶活力水平的研究已表明,ＡＬＰａｓｅ在沉积物磷转化过程中起了一定的作用。为进一步研究沉积物中有机氯化合物对ＡＬＰａｓｅ活力的影响,对厦门西港沉积物中ＡＬＰａｓｅ活力和ＨＣＨｓ、ＤＤＴｓ、ＰＣＢｓ的含量进行了同步检测,结果表明厦门西港沉积物除了个别站位有机氯化合物含量较高外,整体上有机氯化合物的污染并不明显,梗因而对ＡＬＰａｓｅ的影响也较低,但在有机氯化合物污染较重的站位,其     

高强度、高延性铝合金车轮材料的研究

探讨了Ｆｅ量对摩托车车轮材料铝合金Ａ３５６的影响，通过研究加入铬（Ｃｒ）将铁相针状改变成汉字状；以及高效复合熔剂处理，大大细化初生α（Ａｌ）相、变质共晶硅，提高了Ａ３ｓ６合金的综合性能，使其获得高强度和高韧性．     

白蜡虫碱性磷酸酶的分离纯化及部分性质研究

碱性磷酸酶 (ＡｌｋａｌｉｎｅＰｈｏｓｐｈａｔａｓｅ ,简称ＡＫＰ ,ＥＣ 3·1·3·1)可催化磷酸单酯水解及磷酸基团的转移 ,不仅参与钙磷代谢 ,维持体内适宜的钙磷比例 ,而且还与蛋白质的分泌与合成相关 ,在生物体的物质代谢中具有重要作用[1～ 3] .关于微生物、软体动物、文昌鱼和脊椎动物的ＡＫＰ研究 ,国内外均有报道 .对节肢动物的研究较少[4 ] ,而对昆虫的碱性磷酸酶的研究还未见报道 .我们对我国特产资源昆虫白蜡虫的ＡＫＰ进行了分离提纯 ,并对其部分性质作了研究 ,以期为白蜡虫的酶学性质和生化特征提供部分依据 .1　材料和方法1.…     

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.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme     

WIMAX与WI-FI技术分析及联合组网

介绍了WiMAX与Wi-Fi两种无线宽带接入技术,并对两者之间的关系及相互之间的影响做了对比及分析,并对WiMAX的关键技术进行了详细说明,最后对两者的联合组网方式做了简单的探讨。