ARP病毒的原理及防御方法

目的了解ARP病毒原理,有效地防御ARP病毒.方法解析ARP协议原理,分析ARP病毒机理.结果通过ARP病毒原理的分析,指出ARP病毒利用ARP协议本身的漏洞进行ARP欺骗,虚拟网关、制造垃圾数据堵塞网络,从宏观和微观两方面给出局域网内有效地防御ARP病毒的对策.结论ARP病毒是可以防御的1对付病毒最有效的方法是预防,制度、措施、法规、法律是保障,而其核心是人.     

Proapoptotic and pronecrosis effect of different truncated hepatitis C virus core proteins

Objective: To study the roles of different truncated hepatitis C virus (HCV) core proteins (CORE) in the pathogenesis of HCV persistent infection and hepatocellular carcinoma (HCC) and to assess intracellular localization in transiently transfected cells. Methods: Seven truncated CORE-GFP (green fluorescent protein) fusion protein expression plasmids were constructed,which contained HCV CORE sequences derived from tumor tissues (BT) and non-tumor tissues (BNT) from one patient infected with HCV. Amino acid (aa) lengths were BT: 1-172 aa, 1-126 aa, 1-58 aa, 59-126 aa, 127-172 aa; BNT: 1-172 aa and C191:1-172 aa respectively. Subcellular localization of CORE-GFP was analyzed by con-focal laser scanning microscope. Apoptosis and necrosis were quantified by flow cytometry. Results: Different truncated CORE-GFP localized mainly in the cytoplasm, but nuclear staining was also observed. HCV CORE could induce apoptosis and necrosis, and different truncated COREs could induce cell apoptosis and necrosis at different levels. Among the same length 1-172 aa of BT, BNT and C191, the cell apoptosis and necrosis percentage of BT is highest, and C191 is the lowest (BT＞BNT＞C191). To the different fragment COREs of BT,N-terminal of CORE induced apoptosis and necrosis higher, compared with that of C-terminal (1-172 aa＞1-126 aa＞1-58aa＞ 127-172 aa＞59-126 aa). Conclusion: These results suggest HCV CORE could induce apoptosis and necrosis of cells, which might play an important role in the pathogenesis of HCV persistent infection and HCC and the different CORE domains of different HCV quasi-species might have some difference in their pathogenesis.     

Expression of a begomoviral DNAβ gene in transgenic Nicotiana plants induced abnormal cell division

An increasing number of monopartite begomoviruses are being identified that a satellite molecule (DNAβ) is required to induce typical symptoms in host plants. DNAβ encodes a single gene (termed βC1) encoded in the complementary-sense. We have produced transgenic Nicotiana benthamiana and N. tabacum plants expressing theβC1 gene of a DNAβ associated with Tomato yellow leaf curl China virus (TYLCCNV), under the control of the Cauliflower mosaic virus 35S promoter. Transgenic plants expressing βC1 showed severe developmental abnormalities in both species. Microscopic analysis of sections of both transgenic and non-transgenic N. tabacum leaves showed abnormal outgrowths of transgenic N. tabacum to be due to disorganized cell division (hyperplasia) of spongy and palisade parenchyma. Immuno-gold labeling of sections with a polyclonal antibody against the βC1 protein showed that the βC1 protein accumulated in the nuclei of cells. The possible biological function of the βC1 protein was discussed.     

计算机病毒及其防治

随着计算机技术的发展和互联网使用的普及,计算机已成为人们生活和工作中所依赖的重要工具,可是越来越猖獗的计算机病毒严重威胁计算机的安全。本文详尽地阐述了计算机病毒的特点和具体症状,最后提出一些防治计算机病毒的方法。     

开放环境下信息网络安全问题与对策研究

信息安全是开放的基础。开放环境下引起信息安全问题的主要因素有三个:病毒的危害、硬件故障或缺陷、人为因素或管理制度欠缺。预防措施有操作系统和杀毒软件选用、操作系统和网络设置与监控等;检测方法和处理工具采用的是容错型多启系统盘。     

不同抗性品种接种TMV的几项生理指标响应

选择不同抗性的8个烤烟品种（系）,在其烟苗5～7叶期接种烟草普通花叶病毒普通株系（TMV-U）,移栽人大田30 d后比较了8项生理生化指标的变化.结果表明：1）各品种质体色素含量、淀粉含量的变化与品种抗性之间无明显相关性,而MDA含量、Pro含量、NR活性和SOD活性与品种抗性之间密切相关.2）抗病品种感染TMV后SOD活性下降或明显下降,而多数感病品种体内SOD活性却呈现明显增加趋势.3）达到“免疫或抗”水平的有NC102,NC297两个品种,带毒后可能是通过体内维持MDA含量相对稳定或者大幅增加NR活性来抵抗TMV的危害;而达到中抗水平的红花大金元品种则可能是通过大幅增加自身Pro含量来抵抗TMV的危害.     

国际突发公共卫生事件研究发展现状及演进路径：基于文献计量的综述与建议

利用CiteSpace软件分析该领域的研究现状与热点,对Web of Science数据库中2010-2019年突发公共卫生事件领域共5412篇相关文献进行核心国家分析、期刊共被引分析、文献共被引分析、关键词共现分析和关键词突发性检测.研究发现,突发公共卫生事件研究热点领域为传染病学、急诊医学、应急管理和空气污染,其中有关引发重大传染病疫情的病毒研究一直是研究的热点.     

浅析校园网安全防范

本文结合本校的实际情况,从病毒防范及服务器安全策略两方面初步探讨校园网的一些安全防范措施。     

IP—MAC—PORT管理系统在校园网络管理中的作用

本文以交换机的ARP表和PORT—MAC对应表为研究对象,对其在校园网络管理中的作用进行了深入细致的分析和讨论。设计了IP—MAC—PORT网络管理系统,提出了一种发现校园网内ARP欺骗病毒的方法,并经过实际设计和实践,证明了该管理系统能够为校园网络管理人员提供更好的帮助。     

校园网ARP欺骗分析与防范

在对ARP协议分析的基础上,对ARP欺骗攻击进行了深入剖析,并针对不同的ARP欺骗攻击探讨了相应的防范措施。