国槐花浸液对蛙心肌单相动作电位及收缩力的影响

实验采用吸引式电极记录技术结合离体蛙心灌流法，观察了敏感显效量（１ｍｌ任氏液中加入０．１８ｍｌ国槐花浸液，每ｍｌ国槐花浸液相当于１４３ｍｇ生药）下国槐花浸液对蛙心肌单相动作电位ＭＡＰ及收缩力的影响。结果表明：ＭＡＰ的各项电学指标呈一致性减小（少）、心率减慢、心肌收缩力降低。     

兔回肠纵肌肾上腺素能爱体作用分析及递质间的相互作用

实验采用兔离休回肠纵肌标本，观察了经典递质去甲肾上腺素（ＮＥ．）和乙酰胆碱（ＡＣｈ．）对兔回肠纵肌收缩的效应及其相互关系，并对其作用的受体途径进行了分析．实验结果表明；（１）ＡＣｈ能加强回肠纵肌收缩，ＮＥ有抑制作用，但二者的作用可以变化；（２）酚妥拉明使收缩力量增加，心得安使其减弱；（３）ＮＥ能加强Ａｃｈ的兴奋作用，这一加强作用可放心得安阻断．ＡＣｈ对ＮＥ的抑制作用无明显影响．以上结果提示，兔回肠纵肌α肾上腺素能受体介导抑制，β受体介导兴奋，ＮＥ加强Ａｃｈ的兴奋效应与β受体密切相关．     

两卵形弧间的等距对应

本文目的是研究两卵形弧间的等距对应，所得的主要结果是下列两定理：定理设Ｃ和Ｃ￣＊是两条正则的卵形线，它们的长度相等，Ｃ→Ｃ￣＊是等距映射，则在Ｃ上有４个不同的点Ａ１、Ａ２、Ａ３、Ａ４使Ｃ在Ａ＿ｉ的曲率等于Ｃ＊在＝１，２，３，４．）。定理设Ｃ和Ｃ￣＊都是以Ａ、Ｂ为端点的卵形弧，它们的长度相等；Ｃ→Ｃ￣＊是等距映射使；Ｍ为Ｃ上一点；对于ＡＭ上任Ｐ有对ＭＢ上任一点心Ｐ有．则α＊≤α，β≥β＊其中α（α＊）是Ｃ（Ｃ￣＊）在Ａ的弦切角，β（β￣＊）是Ｃ（Ｃ￣＊）在Ｂ的弦切角。     

扶桑花乙酸乙酯溶物（HR—3）对心血管活动影响的初探

初步观察了扶桑花乙酸乙酯溶物（ＨＲ３）的抗心肌缺氧作用及对动物血压和离体蛙心的影响．实验表明：①ＨＲ３可使ＩＣＲ小鼠的常压耐缺氧时间显著延长（Ｐ＜０．０１）,该作用与心得安无明显差异;可以明显延长夹闭气管小鼠的心电消失时间和异丙肾上腺素处理的小鼠心肌耐缺氧时间,提示ＨＲ３能对抗心肌缺氧．②１００ｍｇ／ｋｇ以上的ＨＲ３能明显降低家兔的收缩压与舒张压,该降压作用不被阿托品阻断,但不影响心率．③ＨＲ３对离体蛙心的心率及振幅呈梯度抑制作用,且该作用是可逆的．提示ＨＲ３可能通过减弱心肌收缩力,而产生降压作用和对抗心肌缺氧．     

聚电解质和表面活性剂对铝镁型混合金属氢氧化物正电溶胶稳定性的影响

研究了非离子型聚丙烯酰胺（ＰＡＭ）、阴离子型部分水解聚丙烯酰胺（ＰＨＰＡ）、阳离子型聚丙烯酰胺（ＣＰＡＭ）、醋酸乙烯酯—马来酸酐共聚物（ＶＡ－ＭＡ）及阴离子型表面活性剂十二烷基磺酸钠（ＡＳ）和阳离子型表面活性剂十六烷基三甲基溴化胺（ＣＴＡＢ）对铝镁型混合金属氢氧化物（Ａｌ－ＭｇＭＭＨ）正电溶胶稳定性的影响，根据“桥联”作用、静电作用和疏水作用等对其作用机理进行了探讨．     

担子菌LMPQ39与CSP的原生质体融合

本文以有抗菌作用的担子菌ＣＳＰ的高温敏感性为标记，将ＣＳＰ的原生质体与经热灭活的ＬＭＰＱ３９原生质体融合．融合条件为３０％的ＰＥＧ－６０００，３０℃温度下处理２０ｍｉｎ．融合后得稳定融合子１株（Ｆ１），融合频率为１．１×１０－４．对融合子的初步生化分析表明：其抗菌试验呈阳性；ＣＭＣ（按甲基纤维素）酶活为０．３０８Ｕ；玉米粒上生长良好；其酯酶同功酶谱异于双亲但在双亲谱带范围内，并偏近于ＬＭＰＱ３９．对其外观形态、显微结构及超显微结构的观察表明：融合子的形态结构异于亲株但遍近ＬＭＰＱ３９．     

红芪总皂甙对小鼠免疫功能的增强作用及其与 CaM水平的相关性

研究了红芪总皂甙（ＲａｄｉｘＨｅｄｙｓａｒｉ ｔｏｔａｌ ｓａｐｏｎｉｎｓ，ＲＨＴＳ）对小鼠的免疫增强作用以及免疫细胞的功能与其胞内钙调素（ＣａＭ）水平的相关性，实验结果表明ＲＨＴＳ能显著提高被环磷酰胺抑制的机体免疫功能，与环磷酰胺组相比，ＲＨＴＳ组的胸腺指数和脾脏指数均显著增加（Ｐ〈０．０５）；腹腔巨噬细胞（ＭΦ）的蚕噬百分率和吞噬指数显著升高（Ｐ〈０．０５）；红细胞的免疫粘附作用明显改善（Ｐ〉     

扶桑花乙酸乙酯不溶物HR-4的生物学作用研究

扶桑花乙酸乙酯不溶物ＨＲ－４对离体子宫和心血管系统的影响．结果表明，１．ＨＲ－４对小鼠离体子宫有明显的收缩作用，该作用可被异丙嗪完全阻断；而消炎痛可部分抑制该兴奋作用．２．ＨＲ－４对离体蛙心的心肌收缩力有抑制性影响，且ＨＲ－４对心肌收缩幅度的影响较对心率的影响更为明显．     

金属卟啉在医学和催化中的应用Ⅰ．卟啉配体的合成与方法改良

用改良的Ａｄｌｅｒ－ｌｏｎｇＯ方法合成了若干卟啉配体，得到铰高的收率，所合成的卟啉及所得产率分别为（１）ＴＰＰ２７．３％；（２）Ｔ（３，４，５－３ＭｅＯ－Ｐ）Ｐ３０．４％，（３）Ｔ（４—Ｍｅ—Ｐ）Ｐ２３．９％，（４）Ｔ（３，５—２Ｍｅ）Ｐ２２％；（５）Ｔ（４－Ｃｌ－Ｐ）Ｐ２９．８％，合成反应在低于丙酸的回流温度下进行．     

稀土离子和肌质网（Ca^2＋＋Mg^2＋）—ATP酶相…

研究了稀土离子对肌质网（Ｃａ＾２＋＋Ｍｇ＾２＋）－ＡＴＰ酶活性影响及其作用机制。结果表明，低浓度Ｇｄ＾３＋对肌质网膜上（Ｃａ＾２＋Ｍｇ＾２＋）－ＡＴＰ酶有激活作用，较高浓度Ｇｄ＾３＋抑制其活性，Ｇｄ＾３＋抑制纯化酶的活性，低浓度Ｇｄ＾３＋对磷脂酸（ＦＡ），心磷脂（ＣＬ）重组酶有激活作用，而对磷脂酰胆碱（ＰＣ），磷脂酰胆碱（ＰＣ）与磷脂酰乙醇胺（ＰＥ）混合物（ＰＣ／ＰＥ）及磷脂酰丝氨酸（ＰＳ）重组酶     

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.     

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。