九孢鲍暴发性流行病的病原及病理

1999年2－5月,山东县养殖九孔鲍暴发了大规模流行病,不少养殖场全场覆没,病鲍表现为分泌粘液增多、肝脏红肿、中部僵硬和反应迟钝,应用磷钨酸负染、超薄切片的电镜和现场检测等方法,对病鲍的病原及肝肠组织的病理情况进行观测,结果表明引发这次养殖暴发严重病害的主要病原是致病力很强的病毒和弧菌,电观察到病毒发生在细胞质中的一种称为“封入体”的泡状结构,证实了病原的入侵造成九孢鲍肝及肠等组织、细胞产生病变,描述了细胞和病毒混合感染导致九孔鲍细胞的病理变化。     

1999年春季东山九孔鲍暴发性病害研究

对 １９９９ 年春季福建省东山县九孔鲍的暴发性流行病进行调研和检测,对细菌性病原进行分离纯化、回归感染确定致病原、对致病菌进行形态（包括电镜和光镜观察）和生理生化鉴定;对病毒性病原进行电镜负染和超薄切片观察、以及病理变化分析．结果表明引起此次东山养殖九孔鲍暴发性流行病的主要致病原是 ３ 种球状病毒（５０ ｎｍ 、１１０ ｎｍ 、１５０ ｎｍ ）、溶藻弧菌和副溶血弧菌．还探讨了这些病菌和病毒的致病性,并以 ４９ 种药敏纸试验寻求防治的有效药物．     

感染暴发性流行病病毒的中国对虾形态学研究1.幽门胃的显微和超微结构

为探讨对虾暴发性流行病的致病机理,进行人工感染实验,并对感染中国对虾的胃组织进行了显微和亚显微结构特征的系统观察.观察结果表明胃是该暴发性流行病病毒首先感染的主要的靶器官之一,暴发性流行病病毒能侵入胃壁多种细胞并在其中复制,其中,胃上皮细胞是该病毒的主要的靶细胞.     

易感性和感染性均不同的病毒携带者流行病在开放系统的随机模型

本文在开放系统建立了一类易感性和感染性均不相同的病毒携带者流行病随机模型,用辅助方程及递推法求得了模型的解,并讨论了迁移率对其流行病部分指标的影响,使其更符合于流行病的流行机制,为流行病的预测、预防及治疗提供更多、更准确的信息和措施.     

养成期对虾HHNBV的初步研究

ThePreliminaryStudyonHHNBVinGrow－outPhaseWangJianping;ShenTuJikang(NingboFisheriesResearchInstitute,Ningbo315012）自1993年出现全国流行病对虾暴发性病毒病以来,我国的养虾业始终处于低谷。目前终于发现其病原是一种囊状无包涵体的DNA病毒,称之为对虾“皮下及造血组织坏死杆状病毒”（HNBV）。该病毒的治疗仍无法解决。但我们可以用核酸探针点杂交法来检测对虾HHNBv的发展程度,摸索对虾暴发性病毒病的暴发时间,减少其所带来的经济损失。本文也是我们今后对虾在分子生物学上开展研究的第一步。1材料与方法1．1样…     

河北大学科研成果简介

河北省重大科技攻关计划项目──"对虾病毒性流行病防治技术研究"通过技术鉴定由河北大学等单位承担的河北省首批重大科技攻关项目"对虾病毒性流行病防治技术研究"经过三年的努力,取得了突破性成果,于1996年12月通过了河北省科委、河北省计委和河北省财政厅组织的技术鉴定。对虾养殖业是我国重要的出口创汇产业,为发展沿海经济提高人民生活水平做出了重要贡献,然而1993年对虾病毒性流行病大暴发,使我国的对虾养殖业当年经济损失超过一百亿元。据国内有关部门镜检观察,认为此次大范围流行性虾病的病原体主要是病毒,但它究竟为何种病毒…     

引起人非典型性肺炎的冠状病毒基因组与其它冠状病毒基因组的初步比较

一种在世界范围内突然爆发的致命流行病——急性呼吸窘迫综合症(SARS)击倒了数干人，一种全新的冠状病毒被认为是其病原．5个SARS相关冠状病毒的全基因组序列已经完成．我们进行了SARS相关冠状病毒和其它冠状病毒的基因组进化分析和序列比较，结果显示：1．SARS相关冠状病毒不直接来自于任何已知的冠状病毒；2．E蛋白的基因可能是在近期从其它病毒横向转移到SARS病毒中来的；3．Sl和S2基因发生了较大范围的缺失或插入突变．这些基因横向转移和突变改变了SARS相关病毒的表面结构和抗原性，极有可能是导致其获得侵染人类细胞的主要原因．     

九孔鲍接种灭活病毒的免疫效果分析

通过注射灭活病毒,研究接种免疫对九孔鲍（Haliotis diversicolor supertexta）非特异性免疫机能和免疫保护效果的影响．试验结果表明：九孔鲍接种灭活病毒7d后,体液抗菌活力、溶菌活力和酚氧化酶活性都有显著提高（P〈0．01）;35d后体液抗菌活力和酚氧化酶活性回落至本底水平,与对照组差异不明显（P〉0．05）,溶菌活力则仍然高于对照组水平（P〈0．01）．注射灭活病毒A的免疫效果好于灭活病毒B,九孔鲍接受灭活病毒后引起的免疫应答强度、产生的非特异性抗感染免疫能力和特异性抗感染免疫保护效果都是前者高于后者,且免疫35d后九孔鲍获得的抗特异性病毒感染免疫保护率,灭活病毒A为30％、灭活病毒B为20％．     

重要植物病原物分子检测技术、种类鉴定及其在口岸检疫中应用

正由于缺乏先进的植物病原检测鉴定技术,我国植物病原种类尚未被系统研究。外来植物病原入侵对我国农业生产造成巨大威胁,其检测和防控是世界性难题。因此,建立先进的植物病原检测和鉴定方法,对于认识植物病原种类和分布,防止外来植物病原入侵,维护国家生物安全和促进现代农业健康持续发展具有重要意义。针对上述背景,本成果开     

注册表攻击和网络溢出提权攻击新探索

本文根据网络上各类攻击性病毒的攻击特征,结合当前最流行的病毒攻击方式,从三个方面阐述了注册表攻击和网络溢出提权攻击解决办法。首先介绍了常见流行病毒对注册表攻击的位置。其次系统的阐述了如何防止溢出类攻击的方法,再次详细的分析了如何防止溢出获取Shell后对系统的进一步入侵其它服务器的方法思路以及解决方案。最后得出网络溢出提权攻击解决办法的结论。     

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…     

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)

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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).     

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.     

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.