注射用复方荭草冻干粉针剂(FFHC)对垂体后叶素诱导大鼠急性心肌缺血的保护作用

目的观察注射用复方荭草冻干粉针剂(FFHC)对脑垂体后叶素诱导大鼠急性心肌缺血的保护作用.方法大鼠舌下静脉注射脑垂体后叶素诱导急性心肌缺血模型.以心电图J点位移、PR间期、Q-T间期以及其变化率为检测指标.结果 FFHC高、中剂量能明显对抗垂体后叶素引起的心电图T波、P-R间期和Q-T间期的变化.结论 FFHC对垂急性心肌缺血具有一定的保护作用.     

注射用复方荭草冻干粉针剂(FFHC)对垂体后叶素诱导大鼠急性心肌缺血的保护作用

目的观察注射用复方荭草冻干粉针剂(FFHC)对脑垂体后叶素诱导大鼠急性心肌缺血的保护作用.方法大鼠舌下静脉注射脑垂体后叶素诱导急性心肌缺血模型.以心电图J点位移、PR间期、Q-T间期以及其变化率为检测指标.结果 FFHC高、中剂量能明显对抗垂体后叶素引起的心电图T波、P-R间期和Q-T间期的变化.结论 FFHC对垂急性心肌缺血具有一定的保护作用.     

一口钟液保护实验性心肌缺血及耐缺氧作用的研究

目的探讨一口钟液对实验性心肌缺血的保护作用.方法采用小鼠常压耐缺氧试验和垂体后叶素诱发大鼠急性心肌缺血性试验.结果一口钟液能明显提高小鼠耐缺氧能力,能预防垂体后叶素诱发大鼠急性心肌缺血性心电图的变化.结论一口钟液对实验性心肌缺血有明显的保护作用.     

心肌肽素对大鼠急性心肌缺血的保护作用

目的:观察心肌肽素(cardiomyopeptidi)对大鼠急性心肌缺血的保护作用.方法:建立垂体后叶素(Nh)致急性心肌缺血及冠状动脉结扎致急性心肌梗死模型,采用心电图机测定心肌肽素对大鼠Ⅱ导联及胸V1导联心电图变化的影响.结果:心肌肽素50μg/ml对Nh诱发大鼠心电图T波及ST段的抬高有明显降低作用,亦能明显改善冠状动脉结扎致心肌梗死不同时间点的缺血性心电图变化.结论:心肌肽素对实验性心肌缺血大鼠心电图有明显改善作用.     

银杏叶制剂对大鼠心肌缺血的保护作用

目的:观察银杏叶片对大鼠急性缺血心肌的保护作用.方法:将大鼠随机分为正常对照组、银杏叶片组、消心痛组.灌胃5d后均静脉注射垂体后叶素造成心肌缺血损伤模型,观察三组大鼠心电图ST段偏移及心律失常的发生情况.结果:银杏叶片能明显缓解垂体后叶素所引起的心电图ST段变化(P<0.05),并能使大鼠心律失常的发生率显著下降(P<0.05).结论:银杏叶片对垂体后叶素所致急性缺血心肌具有保护作用.     

冠脉康胶囊对心肌缺血缺氧动物模型的影响

目的复制心肌缺血缺氧动物模型,观察冠脉康胶囊抗心肌缺血缺氧作用。方法采用大鼠舌下静脉注射垂体后叶素诱发急性心肌缺血模型,观察各组注射垂体后叶素后不同时间段内心电图T波高度变化;应用密闭容器造常压缺氧环境,观察冠脉康胶囊对小鼠耐缺氧能力。结果冠脉康胶囊能对抗垂体后叶素引起的T波变化;能延长常压缺氧条件下的小鼠存活时间。结论冠脉康胶囊具有抗心肌缺血作用,并具有耐常压缺氧能力。     

桂枝茯苓丸对垂体后叶素致大鼠急性心肌缺血的保护作用

目的:观察桂枝茯苓丸对垂体后叶素致大鼠心肌缺血的保护作用,为拓宽其临床应用提供科学依据.方法:腹腔注射垂体后叶素(25U/kg)建立大鼠心肌缺血模型,观察桂枝茯苓丸对心肌缺血大鼠血流动力学参数及心肌组织的影响.结果:桂枝茯苓丸能对抗垂体后叶素致心肌缺血大鼠血流动力学指标的异常,降低LVEDP、-LVdp/dtmax,升高+LVdp/dtmax,改善心脏舒缩功能;对心肌组织病理学检测表明药物能明显改善缺血心肌组织的病理损伤.结论:桂枝茯苓丸对垂体后叶素所致心肌缺血具有一定的保护作用.     

参芎滴丸对心肌缺血大鼠抗脂质过氧化损伤的保护作用

目的探讨参芎滴丸对异丙肾上腺素诱导大鼠心肌缺血的保护作用及其机制。方法采用异丙肾上腺素(ISO)诱导大鼠急性心肌缺血模型,观察参芎滴丸预给药5 d后对大鼠注射ISO诱导急性心肌缺血后不同时间点心电图(ECG)J点下移的影响;继续给药2 d检测各组大鼠血清中乳酸脱氢酶(LDH)、肌酸磷酸激酶(CK)和天冬氨酸转氨酶(AST)的活性;同时测定大鼠心肌组织中超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GSH-Px)的活性和丙二醛(MDA)的含量,并观察心肌组织形态学的改变。结果参芎滴丸能明显改善ISO引起的大鼠心电图J点下移变化;降低大鼠血清中LDH、CK、AST的水平和心肌组织中的MDA含量;不同程度地升高心肌组织中的SOD、CAT的活性;明显改善ISO引起的心肌病理损伤;但对GSH-Px活性无明显影响。结论参芎滴丸对大剂量异丙肾上腺素引起的大鼠急性缺血性心肌损伤有明显的保护作用,其机制可能与提高心肌的抗氧化能力、减轻氧化应激反应有关。     

中国南海软珊瑚化学成分的研究(Ⅹ)——一种新喹啉酮衍生物的化学结构及其生理活性

从中国南海短指多型软珊瑚Sinularia polydactyla 分离出一种新的喹啉酮衍生物(Quinolone derivative,简称Q)、分子量191.0587,分子式C_(10)H_9NO_3,由各种光谱及x 光衍射分析等证实其结构为7—羟基—8—甲氧基—4(1H)—喹啉酮.生理活性试验表明,Q 使小白鼠心脏和脑组织血流量明显增加,对由脑垂体后叶素所致的急性心肌缺血的保护作用以及常压耐缺氧试验等均有明显的效应;对由乌头碱引起的心律失常也有缓解作用,其毒性较低.     

心肌宁冲剂对抗垂体后叶素所致大鼠急性心肌缺血实验研究

心肌宁冲剂按1.75g/kg,0.875g/kg剂量,每天早晚分两次灌胃给药,连续7天,均能明显对抗垂体后叶素所诱发的大鼠急性心肌缺血的心电图改变。     

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。