共查询到20条相似文献,搜索用时 93 毫秒
1.
抗禽流感病毒H5和H9亚型血凝素特异性单克隆抗体的研制及应用 总被引:23,自引:0,他引:23
以禽流感题H5和H9亚型病毒分别免疫Balh/c小鼠,取其脾细胞与SP2/0的骨髓瘤细胞融合,用血凝抑制试验(HI)检测细胞培养上清,结果获得了6株特异性单克隆抗体,其中抗禽流感题亚型病毒血凝素特异性单克隆抗体细胞株3株,分别命名为4B6、4A3、3H1;抗H9亚型病毒血凝素单克隆抗体细胞株3株,命名为6E6、6B6和5B4。这些单克隆抗体小鼠腹水HI效价为2^13-15,细胞培养上清抗体HI效价为2^7-8。研究结果表明,所有这些单克隆抗体仅与试验的相应题或ID亚型病毒株发生特异性反应,而不能与鸡新城疫病毒、鹅新城疫病毒、鹅腺病毒和鸡产蛋下降综禽征病毒(EDS76)等反应。实验室检测结果证明,应用这些单克隆抗体能在24h内迅速检测出相应的禽流感病毒。所有这些单克隆抗体将在禽流感的预警预报工作中发挥重要作用。 相似文献
2.
以禽流感H5亚型病毒分别免疫BABL/C小鼠,取其脾细胞与SP2/0骨髓瘤细胞融合,用血凝抑制试验(HI)和间接ELISA检测细胞上清液,结果获得了3株抗禽流感H5亚型病毒特异性单克隆抗体,分别命名为186,1D4,7D1;其中1D4株为抗禽流感H5亚型病毒血凝素特异性单克隆抗体细胞株.186株和7D1株为针对禽流感病毒NP蛋白的单克隆抗体细胞株。经3次亚克隆后,100%杂交瘤细胞保持了分泌抗禽流感病毒抗体的能力。这些单克隆抗体小鼠腹水ELISA效价为10^5,HI效价为2^11-12。研究结果表明,所有这些单克隆抗体仅与相应的禽流感病毒株发生特异性反应,而不与鸡新城疫病毒、产蛋下降综合征病毒、鹅副粘病毒等反应。所有这些单抗在禽流感诊断中将发挥重要作用。 相似文献
3.
以H3亚型禽流感病毒(AIV)免疫BALB/c小鼠,取其脾细胞与SP2/0骨髓瘤细胞融合,用血凝抑制试验(HI)筛选阳性杂交瘤细胞并克隆化。结果获得了4株针对H3亚型禽流感病毒血凝素的单克隆抗体,分别命名为1D7、1F9、5A4、5F5。这些单克隆抗体小鼠腹水HI效价为212~214。用H1、H6、H10亚型禽流感病毒各2株,H4、H5、H9和新城疫病毒(NDV)各1株进行特异性试验。结果表明:所有这些单抗仅与H3亚型AIV发生特异性HI反应,而不与其他亚型AIV及NDV反应。用28株H3亚型禽流感病毒进行排谱试验,结果证明:4株单抗均具有广谱性,其中1F9、5A4、5F5与受试的28株H3亚型AIV均反应,而1D7只与其中的26株反应。以上单抗将为控制畜禽及人类的流感提供必需的诊断试剂。 相似文献
4.
由H5N1亚型禽流感病毒(Avian influenza virus,AIV)引起的高致病性禽流感(highly pathogenic avian influenza, HPAI)是禽类的一种烈性传染病,疫苗免疫是禽流感防控中的重要环节。本试验采用重组禽流感病毒灭活疫苗(H5N1,Re-5株)和重组禽流感病毒H5亚型二价灭活疫苗(H5N1、Re-5株+Re-4株)进行了鸭和鹅的免疫试验,对免疫鸭和鹅的抗体水平进行了动态监测。试验结果表明,两种疫苗对鸭和鹅均具有良好的免疫效果。基于试验结果提出了鸭和鹅禽流感免疫程序:2 w左右首免,4~5 w时二免,开产前三免,此后每隔4~5个月加强免疫一次。 相似文献
5.
利用纯化的H9N2亚型禽流感尿囊液病毒免疫原免疫Balb/c小鼠,应用杂交瘤技术将免疫鼠脾细胞与小鼠骨髓瘤细胞(SP2/0)融合,用间接ELISA方法检测培养上清是否对H5N1亚型AIV及NDV反应,筛选只针对H9N2亚型AIV的阳性细胞株,经克隆获得1株较高亲和力的杂交瘤细胞株,命名为4E7,用其制备的腹水ELISA效价达到2×105,Western-blotting证明单抗4E7经鉴定为针对75KD血凝素的单抗,HI效价为1:27,且不与新城疫病毒、鸡传染性法氏囊病病毒、传染性脑脊髓炎病毒、鸡传染性支气管炎病毒、H5N1亚型禽流感病毒发生交叉反应,具有较好的特异性。IgG亚型为IgG1。 相似文献
6.
具有HI活性的抗H5亚型流感病毒特异性单克隆抗体的研制 总被引:1,自引:2,他引:1
以H5N1亚型禽流感病毒分离株A/Duck/Zhejiang/11/00(H5N1)(DZJ/1100)作为免疫原,浓缩纯化后免疫BALB/c小鼠,三次免疫后,取免疫小鼠脾细胞与SP2/O细胞融合,融合阳性细胞用血凝抑制(HI)方法进行检测,阳性细胞株经三代克隆纯化后,获得三株能稳定分泌抗血凝素特异性HI单克隆抗体的杂交瘤细胞株,分别命名为DD7、FG10、CG12.三株杂交瘤细胞株产生的小鼠腹水和细胞培养液上清的HI滴度分别是213、215、211和27、8、23.与其他具有血凝活性的禽类病毒以及其他14个HA亚型的禽流感病毒的交叉HI试验表明:这三株单抗具有良好的禽流感病毒亚型特异性;与其他H5亚型流感病毒分离株的HI试验和中和试验证实这三株单抗具有良好的交叉性(分别为7/8、8/8、8/8)和中和活性(6/8、8/8、8/8).该亚型特异性单克隆抗体的研制成功为H5亚型禽流感病毒的疫情病原学快速诊断提供了坚实的物质保障. 相似文献
7.
朗德鹅禽流感病毒的分离与鉴定 总被引:2,自引:0,他引:2
用禽流感病毒ELISA试剂盒对某朗德鹅养殖场的病鹅气管粘液进行了检测,发现5份粘液样本均呈禽流感阳性;随后取相应气管组织材料接种于9~11日龄鸡胚分离病毒.发现尿囊液能使鸡红细胞发生凝集,用禽流感病毒H5、H7、H9标准阳性血清和新城疫病毒、传染性支气管炎病毒、传染性喉气管炎病毒、传染性法氏囊炎病毒抗血清作HI试验,结果禽流感病毒H5亚型抗血清的血凝抑制滴度达到2^7,而禽流感病毒H7、H9亚型及其他病毒抗血清无血凝抑制滴度,说明从朗德鹅分离到的病毒为H5亚型禽流感病毒。 相似文献
8.
9.
10.
《中国家禽》2017,(21)
1994年以来,H9N2亚型禽流感病毒(AIV)在中国广泛流行,给养禽业造成了巨大损失。病毒已表现出明显的遗传和抗原多样性,但是对于其抗原性的演化研究较少。本研究选取2014年H9N2亚型AIV分离株A/chicken/Jiangsu/TM118/2014制备针对其血凝素的单克隆抗体,共获得8株稳定分泌针对血凝素蛋白的杂交瘤细胞,分别命名为4B6、3F2、6D11、6B5、1H6、1G6、2D11、3D2,腹水HI效价在2~(11)~2~(19)之间;特异性鉴定结果显示,8株单克隆抗体仅特异针对H9亚型禽流感病毒,而与其他亚型禽流感病毒及其他感染家禽的常见病毒不反应;广谱性分析显示,6D11可以与所选毒株的绝大部分反应,其它7株与不同年代、不同谱系的反应性不同;8株单克隆抗体均能与感染H9亚型禽流感病毒的MDCK细胞特异性反应,呈现绿色荧光。本研究所获得的单克隆抗体可在H9亚型禽流感病毒的抗原性位点分析、流行病学监测及临床检测中发挥重要作用。 相似文献
11.
12.
13.
魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
14.
本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
15.
REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
16.
17.
18.
19.
以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
20.
Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献