计算机病毒的通用防护技术

本文在充分分析计算机病毒机理的基础上，指出病毒防护的可能性，并且，开发了一种较为有效的防护病毒技术，给出了全部程序框图及部分程序。     

浅谈网络安全的主要威胁及防范措施

21世纪全世界的计算机都将通过Internet联结到一起,同时计算机网络具有联结形式多样性、终端分布不均匀性和网络的开放性、互联性等特征,致使网络易受黑客、恶意软件和其他不轨的攻击,所以使得网络安全问题越来越突出。本文介绍了网络安全中常见的几类安全威胁,以及如何建立一个安全高效的网络系统进行探讨。     

如何使用Sniffer Portable分析ARP病毒攻击

网络病毒无处不在,防不胜防,ARP病毒具有很大危害性,它发送大量的伪造数据包,占用网络带宽,通过攻击网关MAC地址,会造成全网段计算机无法正常上网,它还通过截取数据包方式,盗取用户帐户和密码等信息。要彻底分析ARP病毒,必须从ARP协议和病毒工作原理入手,分析查找病毒源。Sniffer Portable软件作为流行的抓包工具,功能强大,几乎所有网络异常情况,都可以通过它得以及时发现,它支持OSI七层协议,能在各种网络拓扑环境中抓取数据包并进行解码,直观易懂,是网络技术人员的必备工具之一。     

计算机病毒与反病毒技术的发展

本文对目前计算机病毒的特征、种类、特点、危害进行了新的认识，并论述了病毒防治的新技术。     

醛化鸡红细胞吸附释放结合NP-40法纯化新城疫病毒蛋白

采用醛化鸡红细胞吸附释放结合NP-40法纯化鸡胚尿囊液中的新城疫病毒蛋白.通过收集纯化的新城疫病毒,并测定新城疫病毒血凝效价和进行9%SDS-PAGE电泳,以测定新城疫病毒蛋白的纯度.用该方法纯化的新城疫病毒血凝效价为1∶256,进行9%SDS-PAGE电泳后,发现得到的新城疫病毒蛋白不含鸡胚尿囊液蛋白,是纯度较高的新城疫病毒蛋白.以上结果表明,醛化鸡红细胞吸附释放法结合NP-40法是一种经济实用、操作简便,并有较高纯化效率的方法.     

甲肝和麻疹病毒混合感染人胚肺二倍体细胞病毒增殖动态及与细胞相互作用的研究

目的　探讨甲肝病毒 (HAV)和麻疹病毒 (MV)混合感染人胚肺二倍体细胞 2BS株 (2BS)病毒增殖动态及病毒与细胞相互作用的关系 ,为制备甲肝 -麻疹二联活疫苗提供基础资料。方法　将HAV和MV先后感染2BS ,应用细胞病理学、亲和素 生物素系统免疫组化技术和电镜技术检测HAV和MV在 2BS内增殖动态及 2种病毒与细胞的相互关系 ,观察HAV和MV在细胞内的超微结构。结果　HAV和MV能在同一种细胞基质中增殖 ,也能在同一个细胞中增殖 ,但 2种病毒与细胞的相互作用明显不同。结论　HAV对MV的再感染似乎无明显干扰现象     

计算机病毒防护的软件措施分析

在计算机、网络的日常维护中,应该确定良好的软件使用和操作习惯,实行有效的杀毒防毒软件搭配措施,从而充分发挥软件杀毒防毒的最优功能。本文将通过对计算机病毒防护软件使用过程中应注意的问题说起,介绍了计算机病毒防护软件搭配使用的具体措施,从而推出了一个具体的搭配方案。     

Crosslinking-mediated activation of the FcεRI: Does it need antigen for success?

Mast cells (MCs), hematopoietic cells of the myeloid lineage, are well-known for their pro-inflammatory nature contributing to the development of various allergic and autoimmune diseases. One of the characteristic receptors on MCs, the high-affinity receptor for IgE (FcεRI), is activated in its IgE-bound state via binding and crosslinking by polyvalent antigen. This results in its phosphorylation by the SRC family kinase LYN, initiating differential signaling pathways, eventually triggering immunological effector functions, such as degranulation and cytokine production. Few publications have reported on FcεRI-dependent but antigen-independent MC activation by antibody-mediated crosslinking of membrane molecules (e.g., transmembrane proteins and glycosphingolipids) that are both localized in membrane rafts and in close vicinity to the FcεRI. In this Viewpoint we will briefly introduce FcεRI-mediated MC stimulation, cite examples of FcεRI-proximal molecules, the crosslinking of which can cause FcεRI-dependent MC activation, and discuss the potential of certain viruses as well as auto-antibodies to act as indirect FcεRI-crosslinking agents. In latter cases, antigen-independent FcεRI-mediated pro-inflammatory MC activation could contribute to the development of detrimental cytokine storms.     

Ozone in the Laundry Industry—Practical Experiences in the United Kingdom

Since the early 1990s, the use of ozone in many commercial and industrial laundering applications has been evolving rapidly. Ozone allows washing to be conducted using cold water, thereby saving considerable heat energy and water consumption. Additionally, ozone enhances the wash process, resulting in a significant reduction in detergent dosage and number of rinses, thus saving water. Ozone/cold water cycles are gentler to fabrics, thus extending linen life. Finally, ozone/cold water laundering is beneficial for effluents, resulting in reductions in COD (chemical oxygen demand). Microorganisms are destroyed effectively in ozone-wash waters, and washing and drying cycles are shorter, thus saving labor. In this paper, the authors describe some specific case studies at commercial laundering installations in the UK, whereby the users of ozone have reaped major benefits, including enhanced microorganism kills/inactivation and significant cost savings.     

Iron oxide amended biosand filters for virus removal

Laboratory studies were performed to determine if the addition of iron oxides throughout biosand filter (BSF) media would increase virus removal due to adsorption. The proposed mechanism is electrostatic adsorption of negatively charged virion particles to positively charged iron oxides formed during the corrosion of zerovalent iron. Initial tests conducted using continuous flow, small-scale glass columns showed high MS2 bacteriophage removal in an iron-amended sand column (5log₁₀) compared to a sand-only column (0.5log₁₀) over 20 pore volumes. Additionally, two experiments with a column containing iron particles revealed 4log₁₀ and 5log₁₀ removal of rotavirus in the presence of 20 mg/L total organic carbon. Full-scale BSFs with iron particles removed >4log₁₀ MS2 for the duration of the experiment (287 days), while BSF with steel wool removed >4log₁₀ MS2 for the first 160 days. Plug flow for the BSF was shown to depend on uniformity between the iron oxide material and sand media grains. The results suggest that the duration of effective virus removal by iron-amended biosand filtration depends on source water conditions and the quantity and composition of iron material added. Overall, this study provides evidence that iron-amended BSFs may advance the field of point-of-use technologies and bring relief to millions of people suffering from waterborne diseases.