首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   11篇
  国内免费   1篇
  完全免费   2篇
  综合类   14篇
  2014年   1篇
  2012年   2篇
  2011年   1篇
  2007年   4篇
  2006年   2篇
  2003年   1篇
  2002年   1篇
  1998年   1篇
  1992年   1篇
排序方式: 共有14条查询结果,搜索用时 46 毫秒
1.
Hemagglutinin-neuramidinase (HN), a Newcastle disease virus-derived protein, not only mediates receptor recognition but also possesses neuraminidase (NA) activity, the ability to cleave a component of those receptors, N-acetylneuraminic acid (NAcneu, sialic acid). It is known that this protein in mammalian species, including human beings, has interesting anti-neoplastic as well as immune stimulating properties. To explore the use of the HN gene in cancer gene therapy, we constructed a recombi-nant fowlpox virus expressing the HN protein (vFV-HN) and compared the anti-tumor activity of the recombinant virus with that of wild-type fowlpox virus (FPV) in vivo and in vitro. Here we found that although B16 cells were somewhat resistant to the basal cytotoxic effect of wild-type fowlpox virus, infection with vFV-HN caused a pronounced cytotoxic effect and, the survival of tumor-bearing mice immunized with vFV-HN was significantly increased compared with the survival of mice immunized with the FPV alone. Furthermore, the immunization of mice with vFV-HN elicited a B16 tumor-specific cytotoxic T lymphocyte (CTL) response and clonal expansion of both CD4 and CD8 T cell populations in vivo. In addition, T cells from lymph nodes of mice vaccinated with vFV-HN secreted high levels of the Th1 cytokine IL-2 and IFN-γ, indicating that the regression of tumor cells is related to a Th1-type dominant immune response. These results demonstrate that vaccination with vFV-HN may be a potential strategy for cancer gene therapy.  相似文献
2.
NDV核心抗原重组杆状病毒转移载体的构建   总被引:3,自引:1,他引:2  
F和HN蛋白是新城疫病毒(NDV)中两种具有抗原性的表面糖蛋白.对NDV中国强毒株F48E8的F和HN基因进行了全长核苷酸序列分析.F基因的长度为1662bp,编码553个氨基酸,糖基化位点与已知的其他株系的位点相同;HN基因全长1904bp,编码571个氨基酸,其中第5个糖基化位点(第500~502个氨基酸)由NPT突变成NPV.为了便于在杆状病毒中表达,将F和HN基因的核心抗原区通过PCR扩增,并成功地克隆进杆状病毒转移栽体中,为利用杆状病毒表达系统生产抗新城疫病毒的基因工程疫苗打下基础.  相似文献
3.
中药复方制剂抗鸡新城疫病毒活性的研究   总被引:1,自引:0,他引:1  
病毒病严重危害养殖业的发展,从传统中药筛选有效抗病毒药物是抗病毒研究的重要内容之一.本试验以鸡新城疫病毒(NDV)为模式病毒,评价了一种水萃取浓缩制备成的中药复方颗粒剂的抗病毒活性.通过鸡胚保护试验、人工攻毒保护试验、对自然病例的治疗试验等证实,该制剂具明显地抗鸡新城疫病毒的活性.该制剂0.13mg/胚即可保护50%鸡胚抵抗NDV强毒的致死作用;按0.5g/kg体重口服,人工感染病例的对照组存活率提高54%;对实时荧光定量PCR确诊的ND病鸡4500只进行治疗,0.5g/kg体重饮水,连续使用5天,用药后第2天症状明显减轻,3天后可基本控制死亡,治愈率为95%.  相似文献
4.
结合宏观和微观模型 ,对GaAs AlAs弱耦合掺杂超晶格的纵向输运问题进行模拟计算 ,并给出产生电流自激振荡时的掺杂浓度和固定偏压的范围 .计算结果与实验数据基本吻合  相似文献
5.
Membrane fusion is a key step in enveloped virus entry. Highly conserved heptad repeat regions (HR1 and HR2) of Newcastle disease virus (NDV) fusion protein (F) are critical functional domains for viral membrane fusion. They display different conformations in the membrane fusion states and are viewed as candidate targets for neutralizing antibody responses. We previously reported that an analog of heptad repeat peptides HR2-HR1-HR2(HR212) and HR2 could inhibit NDV induced cell-cell membrane fusion. Here, we show that HR212 can induce the production of highly potent antibody in immunized rabbits, which could recognize full length peptides of both HR1 and HR2, and inhibit NDV hemagglutination and NDV entry. These suggest that either HR212 or its antibody could be an inhibitor of virus-induced cell-cell membrane fusion.  相似文献
6.
对NDV四川分离鸡源强毒株SC01的F基因进行克隆测序,克隆的SC01 F基因片段长1600bp,编码的F蛋白裂解位点序列为112R-R-Q-K-R-F117,具有强毒株序列特征,聚类分析属基因Ⅶe型;F基因与国内外NDV代表株的核苷酸同源性为75.4 %~95.4 %,其中与鹅源毒株JS501Go 的同源性高达95.4%,与F48E8同源性为84.3%,与La Sota 的同源性为82%;La Sota弱毒活疫苗及F48E8灭活疫苗免疫小鸡2周后,对SC01的致死性攻击能提供完全保护.  相似文献
7.
采用钼酸铵负染色方法,电镜观察一株野外分离的嗜神经型新城疫病毒。分离的毒株接种SPF鸡胚后,收集尿囊液,在电镜下看到大量圆形或扁圆形,直径200 ̄300nm的病毒颗粒,并且,部分病毒粒子囊膜及纤突清晰可见。  相似文献
8.
应用 A 株、F_(48)E_8株新城疫病毒对不同日龄鹌鹑人工发病试验,结果表明:不同日龄鹌鹑对两毒株均有较强的易感性;随日龄增加到成年鹌鹑时则易感性降低。A 株和 F_(48)E_8株病毒所致的病变在各日龄基本相似,但 A 株比 F_(48)E_8株病毒对神经系统的损伤为重。  相似文献
9.
Membrane fusion is a key step in enveloped virus entry. Highly conserved heptad repeat regions (HR1 and HR2) of Newcastle disease virus (NDV) fusion protein (F) are critical functional domains for viral membrane fusion. They display different conformations in the membrane fusion states and are viewed as candidate targets for neutralizing antibody responses. We previously reported that an analog of heptad repeat peptides HR2-HR1-HR2(HR212) and HR2 could inhibit NDV induced cell-cell membrane fusion. Here, we show that HR212 can induce the production of highly potent antibody in immunized rabbits, which could recognize full length peptides of both HR1 and HR2, and inhibit NDV hemagglutination and NDV entry. These suggest that either HR212 or its antibody could be an inhibitor of virus-induced cell-cell membrane fusion.  相似文献
10.
为探讨NDV-Lasota株在鸡胚成纤维细胞(CEF)上的增殖特性,采用细胞病变观察、空斑技术、红细胞吸附试验和血凝试验等方法对Lasota株在CEF上的感染特性及其增殖动力学进行检测。结果表明:NDV-Lasota株在添加外源性胰蛋白酶的条件下,可在CEF上有效复制,细胞维持液中胰蛋白酶浓度为25μg/mL时,病毒感染细胞24 h后,红细胞吸附试验呈阳性;30 h后培养上清液血凝效价大于22;48 h后出现明显的细胞病变;72 h后细胞单层上形成边界清晰、圆形的小空斑。  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号