琼枝和异枝麒麟菜中硫酸酯基多糖不同提取方法的化学分析比较

采用“直接水提法”以及“KCl分级法”来提取琼枝和异枝麒麟菜中的多糖．分别用蒽酮-硫酸法、间苯二酚法、明胶-BaCl2分光光度法测定多糖样品的总糖质量分数、3，6-内醚半乳糖质量分数、总硫酸基质量分数；用凝胶色谱法测定各多糖样品的相对分子质量分布情况：用GCMS测定麒麟菜硫酸酯基多糖的单糖种类及含量．结果显示采用“直接水提法”以及“KCl分级法”比传统的“碱处理法”产率高，而且硫酸基质量分数也明显增高．两种麒麟菜多糖均为硫酸酯基多糖，大部分都属于k-卡拉胶类．各多糖样品的相对分子质量分布在10^5左右．麒麟菜多糖主要是由半乳糖和3，6-内醚半乳糖组成，此外还含有少量的葡萄糖、木糖、塔罗糖和艾杜糖等，不同方法提取的多糖样品其单糖种类基本一致．     

异枝麒麟菜活性硫酸粗多糖的提取工艺优化

采用能有效保护抗病毒活性基团的直接水提法提取异枝麒麟菜活性硫酸多糖，通过正交试验研究了影响多糖得率的工艺参数：KCl质量分数、温度、时间、料液比；通过均匀试验研究了其中影响最大的因素的最佳水平．结果表明，温度和KCl质量分数为多糖得率的最大影响因素，其最佳水平分别为125℃和0．93％．结合实际情况，最佳提取工艺条件可为：浸提温度95～100℃、浸提时间6h、料液质量比1：90、KCl质量分数0．93％．     

硒化麒麟菜多糖对宫颈癌细胞株生长和淍亡的影响

目的：探讨硒化麒麟菜多糖在体外对宫颈癌Hela细胞株生长和凋亡的作用及机制。方法：以宫颈癌Hela细胞株为研究对象，用MTT法检测硒化麒麟菜多糖对肿瘤细胞增殖的影响，流式细胞仪检测细胞周期、细胞调亡以及凋亡基因Fas的表达情况，以顺铂为对照组，比较硒化麒麟菜多糖与顺铂的疗效。结果：硒化麒麟菜多糖可阻滞宫颈癌Hela细胞的生长使之停留在S和G2-M期，从而抑制了肿瘤细胞的增殖，同时通过促进Fas表达，诱导Hela细胞凋亡。结论：硒化麒麟菜多糖通过阻滞肿瘤细胞的生长及诱导细胞凋亡等机制，对宫颈癌细胞的增殖有一定的抑制作用。     

耳突麒麟菜多糖的提取分离及表征

对耳突麒麟菜多糖提取、分离纯化质以及结构性质进行研究 .耳突麒麟菜粗多糖的提取率为 46 .7% ,粗多糖可被 4%的KCl完全分级为不溶胶多糖与可溶胶多糖 ,不溶胶多糖占所提取粗多糖量的 83% ,可溶胶多糖占 14% .不溶胶多糖的硫酸根含量和 3 ,6 -AG含量分别为 30 .8%和 2 6 .3% ,可溶胶多糖的硫酸根含量和 3 ,6 -AG含量分别为 38.5 %和 30 .1% .经红外光谱分析 ,不溶胶多糖的结构类似κ -卡拉胶 ,可溶胶多糖的结构类似 ζ -卡拉胶 .两种多糖经过酸水解后 ,3 ,6 -AG和硫酸根含量下降 ;经过碱处理后 ,3,6 -AG含量增加 ,但硫酸根含量显著降低 .     

麒麟菜粗多糖中多糖与蛋白质结合方式

从海藻麒麟菜中提取的粗多糖含有一定量的蛋白质，采用Sevag法在除麒麟菜粗多糖蛋白质，则蛋白质与多糖以相同的比例减少，粗多糖酸解液的pH调整为11．0后，经凝胶SephadexG—l00层析，能使蛋白质部分分离，而酸性条件无法使之分离，实验结果表明，粗多糖中蛋白质不是以游离的形式存在，可能以离子键方式与多糖分子中的硫酸根聚阴离子相结合，提取麒麟菜多糖和纯化过程中，控制合适的pH条件有利于分离蛋白质。     

硒化麒麟菜多糖对宫颈癌细胞株生长和淍亡的影响

目的:探讨硒化麒麟菜多糖在体外对宫颈癌Hela细胞株生长和凋亡的作用及机制.方法: 以宫颈癌Hela细胞株为研究对象,用MTT法检测硒化麒麟菜多糖对肿瘤细胞增殖的影响,流式细胞仪检测细胞周期、细胞调亡以及凋亡基因Fas的表达情况,以顺铂为对照组,比较硒化麒麟菜多糖与顺铂的疗效.结果:硒化麒麟菜多糖可阻滞宫颈癌Hela细胞的生长使之停留在S和G2-M期,从而抑制了肿瘤细胞的增殖,同时通过促进Fas表达,诱导Hela细胞凋亡.结论: 硒化麒麟菜多糖通过阻滞肿瘤细胞的生长及诱导细胞凋亡等机制,对宫颈癌细胞的增殖有一定的抑制作用.     

中国眼子菜科调查研究报告

通过对全国各地水生植物调查研究的结果表明：中国的眼子菜科植物，共有２８种和变种（龙须眼子菜的变种，全部未用）。其中有作者新种４个（转载了图），马毓泉新种２个，王万贤新种１个（另１新种，作者未承认）；否定了对叶眼子菜属，仍放回原来的对叶组。另外建立了两个新亚属，直胚亚属ＲｅｃｔｉｅｍｂｒｙｏＤｉａｏ和钩胚亚属ＵｎｃｉｎｉｅｍｂｒｙｏＤｉａｏ，后者又划分为互生叶组ＡｌｔｅｒｎａｔｉｏｐｈｙｌｉＤｉａｏ，ｓｅｃｔ．ｎｏｎ．和对生叶组ＥｕａｎｔｉｏｐｈｙｌｉＫｏｃｈ；并证实了，中国植物学家鉴定为异枝眼子菜Ｐ．ｈｅｔ－ｅｒｏｐｈｙｌｕｓＳｃｈｒｅｂｅｒ的标本，实为异枝眼子菜标本的误定；花被是真正的花被片等。     

狭基香茶菜水溶性多糖的分离纯化及组成的定性研究

狭基香茶菜干燥后经水提取、醇沉淀再经ＳｅｐｈａｄｅｘＧ－１５０柱色谱纯化,分离得到４种狭基香茶菜水溶性多糖ＡＲＰ、ＡＲＰ－２、ＡＲＰ－３和ＡＲＰ－４;采用ＳｅｐｈａｄｅｓｘＧ－２００柱层析,琼脂糖凝胶电泳等方法证明为均一性多糖组分,用凝胶谱法测得相对平均分子质量分别是４２０００、９４００、３４０００和８７００;红外光谱,高效液相色谱等表明,ＡＲＰ－１由Ｌ－鼠李糖、Ｄ－１葡萄糖组成,糖残基以α１,２     

中国眼子菜属一新种

近年来在四川、黑龙江和新疆等省、自治区发现眼子菜属一个新种，该新种因具异枝异叶，被命名为异枝眼子菜（新种）；其果具相同的背腹脊（棱）各一条；嘴小，背曲如钩；被片果时变厚硬而绿色；鲜果球形，干后果皮的在皮细胞呈多角形，而不同于属内其他种类。且生态变异幅度大，生丛密杂草之空隙中者，无浮泛叶，正常开花结果；生近岸波动之浅水中者，则通常不分枝。     

大籽獐牙菜多糖的提取及含量测定

通过正交试验确定从大籽獐牙菜中提取多糖的优化条件，用分光光度法测定其多糖的含量。结果表明：水浴温度80℃，料液比1：10（w／v），提取时间2．5h，提取3次为大籽獐牙菜多糖提取的最佳工艺；该条件下的大籽獐牙菜中多糖含量最高，为26．01mg／g。     

耳突麒麟莱卡拉胶提取的优化选择

采用L9(3)^4正交表,试验分析了用稀的NaOH—KCl混合处理菲律宾耳突麒麟莱时影响产品得率和凝胶强度的因素,提出了最佳生产工艺条件。     

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.     

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     

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.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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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.