传染性牛鼻气管炎亚单位疫苗免疫原性的研究     

刘发志  陈毓川  赵青松  刘方玉 《中国预防兽医学报》2001,23(3):206-208

用犊牛睾丸细胞培养传染性牛鼻气管炎病毒（IBRV），反复冻融，差速离心提取病毒，用Triton X-100溶解，超声波处理，制成IBRV TritonX-100亚单位抗原，经SDS－PAGE电泳，其分子量在176kD-53kD之间，其中有6条清晰的蛋白带。该抗原与一定比例的白油－司盘佐剂乳化，接种育成年，经间接ELISA检测，可使接种的育成牛产生高效价的血清抗体（OD492mm=1.57)。2种不同剂量（80mg/头，40mg／头）的IBRV亚单位疫苗接种育成牛，体内抗体效价相差不显著，抗体可在体内持续12周，用IBRV TrionX-100亚单位疫苗2次接种育成牛，其体内抗体效价显著高于用灭活疫苗2次接种育成牛体内的效价。试验结果表明：提取的IBRV多肽制作的亚单位疫苗具有良好的免疫原性，且抗体持续时间较长。  相似文献   

间接法Dot－ELISA检测传染性法氏囊病病毒的研究     

刘爵  甘孟侯  刘尚高 《中国兽医杂志》1995,(6)

本文应用间接法Ｄｏｔ－ＥＬＩＳＡ进行鸡传染性法氏囊病病毒（ＩＢＤＶ）抗原的检测，其最低检出量为０．４３μｇ／ｍｌ。对人工感染／自然病例的各组织脏器进行检测，结果法氏囊的ＩＢＤＶ检出率为１００％，脾脏的检出率为８０％／８４．９％，其它器官组织如肾、胸腺、心、肝、肺、盲肠扁桃体、胸肌等均含有一定量的病毒（１１～６０％）。经统计学分析，法氏囊与脾脏的病毒检出率之间具有显著性差异（人工感染差异极显著Ｐ＜０．０１，自然病例差异显著Ｐ＜０．０５），进一步证实法氏囊是ＩＢＤＶ最主要的靶器官。试验结果表明，该法检测ＩＢＤＶ抗原，敏感性高、特异性强、重复性好，并且经济、方便、快速，适于大批量样品检测，可作为一种诊断ＩＢＤ的比较理想的方法。  相似文献   

间接持有体制下证券投资者的财产权性质论     

鲁世平  李希平 《湖南农业大学学报(自然科学版)》2016,(4):141-144

20世纪末以来，经济和科技两方面的发展使证券交易体制发生了从直接持有体制到间接持有体制的革命性转换。在证券的间接持有体制下，证券投资者与中介机构之间的法律关系是行纪关系；证券投资者对证券享有的权属的性质是“所有权”。由于同一托管人为众多的证券投资者托管，并且证券投资者对证券享有的所有权是通过支配不包含有体物的财产权行使的，所以证券投资者对证券享有的是一种“按份共有”形式的“准所有权”。  相似文献   

枣树间接地下滴灌根区土壤盐分运移规律研究   总被引：7，自引：0，他引：7  

孙三民  安巧霞  蔡焕杰  姚宝林  乔英 《农业机械学报》2015,46(1):160-169

通过小区试验研究了间接地下滴灌条件下密植枣树根区不同方向(水平及垂直方向)、不同土层盐分质量比的变化特征,及导水装置直径(50、75、90 mm)和灌水量(9、13、17 L/(棵·次))对枣树根区土壤盐分运移的影响。结果表明:经过一段时间后,垂直方向10~40 cm土层盐分质量比较低,0~10 cm土层盐分质量比最高;水平方向10~50 cm各土层盐分质量比随与出水口水平距离的增加而增大。在单次灌水后导水装置直径一定时各土层脱盐率随灌水量的增加而增大。当灌水量一定时,10~40 cm土层脱盐率随导水装置直径的增加呈减小的趋势,0~10 cm、40~50 cm脱盐率随导水装置直径增大呈低-高-低的趋势。在7—9月份,当导水装置直径为75 mm,灌水量为13、17 L/(棵·次)时,0~50 cm土层土壤平均盐分质量比均较低而且变化幅度较小。综合考虑节水、抑盐效果,确定导水装置直径为75 mm,灌水量为13 L/(棵·次)为适宜的间接地下滴灌灌溉模式。  相似文献   

Seroprevalence of chlamydial infection in dairy cattle in Guangzhou, southern China     

Dong-Hui Zhou  Fu-Rong Zhao  Hui-Yan Xia  Min-Jun Xu  Si-Yang Huang  Hui-Qun Song  Xing-Quan Zhu 《Irish veterinary journal》2013,66(1):1-4

Chlamydia spp. are obligate intracellular gram-negative bacteria that cause a wide range of significant diseases in humans and animals worldwide, resulting in significant economic losses. Chlamydial infection in cattle has been reported in many countries including China. However, there has been no survey of chlamydial infection of dairy cattle in Guangzhou, southern China. The objective of the present investigation was to examine the chlamydial seroprevalence in dairy cattle in Guangzhou, subtropical southern China by using an indirect hemagglutination assay (IHA). The overall seroprevalence of chlamydial infection in dairy cattle was 7.25% (29/400). Greater than or equal to eight-yr-old dairy cattle had the highest seroprevalence (10.34%), followed by those that were ≥ 6 years old or < 7 years old dairy cattle (10.20%), although there were no statistically significant differences among different groups (P > 0.05). Dairy cattle with 5 pregnancies had the highest seroprevalence (10.81%). These results indicate that chlamydial infection was present in dairy cattle in Guangzhou, subtropical southern China, and integrated strategies and measures should be executed to control and prevent chlamydial infection and disease outbreak in the study region.  相似文献   

Prevalence of bovine herpesvirus-4 infection in cats in Central Michigan     

Kruger JM  Venta PJ  Swenson CL  Syring R  Gibbons-Burgener SN  Richter M  Maes RK 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2000,14(6):593-597

The gammaherpesvirus bovine herpesvirus-4 (BHV-4) has been isolated from a wide variety of animals, including lions and domestic cats. Although BHV-4 antibodies have been detected in normal cats and cats with urinary disorders, the epidemiology and pathogenic role of BHV-4 in cats is unknown. The purpose of this study was to determine the prevalence of BHV-4 antibodies and viral nucleic acid in a population of free-roaming cats. Plasma and peripheral blood leukocyte samples were collected from 52 male and 52 female free-roaming cats impounded at a regional animal control facility in Central Michigan. Plasma concentrations of BHV-4 antibodies were measured with an indirect fluorescent antibody test. Peripheral blood leukocyte DNA was isolated, and a 2-stage polymerase chain reaction with heminested primers delineating a conserved portion of the BHV-4 glycoprotein B gene homologue was used to amplify BHV-4-specific DNA sequences. BHV-4 antibodies were detected in 38 (73%) male and 23 (44%) female cats. Seropositive cats were significantly more likely to be male than female (odds ratio = 3.22; P = .007). Cell-associated viremia was detected in 17 (33%) male and 11 (21%) female cats. Of the 61 seropositive cats, 23 (38%) had a detectable viremia; only 5 (12%) seronegative cats had detectable viremia. Seropositive cats were significantly more likely to be viremic than seronegative cats (OR = 4.30: P = .009). Our results suggest that BHV-4 infection may be more widespread in certain cat populations than previously reported. Furthermore, many cats seropositive for BHV-4 antibodies have a concurrent cell-associated viremia.  相似文献   

猪弓形体病的血清学调查   总被引：3，自引：1，他引：3  

冼琼珍  蔡明福  王淑敏  顾万军 《中国畜牧兽医》2006,33(11):103-104

采用间接血凝试验(IHA)对广东省部分地区猪场送检的269份血清进行猪弓形体病的血清学检测,结果表明有61份血清阳性,平均阳性率为22.7%,最高阳性率为71.4%,该地区猪场有猪弓形体病感染。  相似文献   

抗猪瘟免疫球蛋白在猪初乳中变化规律研究     

张媛 《吉林畜牧兽医》2007,28(11):7-9

以猪瘟弱毒疫苗免疫空怀母猪,待母猪分娩后,分别收集10d内的乳汁,以建立的间接ELISA法检测猪瘟IgA、IgG、IgM水平,并观察各种抗体动态变化规律。试验结果表明,猪初乳中的IgA、IgG、IgM抗体效价均在分娩当天达到最高值,随后迅速下降,7d后抗体水平与常乳基本一致(>0.05)。对照组母猪仅在分娩当天检测到较低的抗体水平。  相似文献   

3个不同基因型新城疫病毒间的抗原同源性比较   总被引：3，自引：2，他引：3  

邱玉玉  孙淑红  李晓霞  崔治中 《中国兽医学报》2006,26(2):114-116

分别以鸡新城疫病毒（NDV）基因Ⅱ型弱毒疫苗株LaSota、基因Ⅶ型鸡源野毒株Y98F9和基因Ⅵ型鸽源野毒株PB9601为灭活疫苗，制备相应的抗血清。将3株病毒分别与相应的抗血清做交叉血凝抑制试验（HI）和在细胞培养上做交叉病毒中和试验（VI）．以此比较3个基因型病毒间的抗原同源性关系。在交叉HI中，LaSota株与基因Ⅶ型的Y98F9株间的同源性为90．0％，而基因Ⅵ型的鸽源PB9601株与Y98F9株间的抗原同源性仅为74．2％，与LaSota株间的抗原同源性更低至65．2％。在交叉VI中，也表现出非常类似的同源性关系，LaSota株与Y98F9株间的同源性为90．1％，而鸽源PB9601株与Y98F9株间的同源性也仅为75％，与LaSota的同源性进一步低至65．8％。  相似文献   

重组GP5AB蛋白间接ELISA检测PRRSV抗体方法的研究   总被引：1，自引：0，他引：1  

顾小雪  姜平  韩研妍  李玉峰 《畜牧与兽医》2007,39(2):1-5

利用GST-GP5AB重组蛋白作为包被抗原,通过反应条件优化,建立了用于检测猪繁殖与呼吸综合征病毒(PRRSV)抗体的间接ELISA方法。抗原最适包被浓度为2μg/mL,最佳封闭液为0.15%BSA,37℃封闭2 h后,再4℃封闭24 h,血清最适稀释度为1∶200,其作用时间为60m in,酶标抗体最适稀释度为1∶20 000,最适作用时间为90 m in,37℃显色10 m in,S/P≥0.284为阳性,S/P≤0.26为阴性,介于二者之间为可疑的判定标准。该抗原与猪其他4种临床症状类似的疾病的阳性血清反应呈阴性。批内和批间重复性试验结果,变异系数均小于7%,表明本方法具有较好的特异性和重复性。应用本方法初步检测了一些疫苗免疫仔猪血清样品,并与重组N蛋白和PRRSV抗原同时进行比较,结果显示3种抗原检测的结果基本一致。  相似文献