共查询到20条相似文献，搜索用时 799 毫秒
1.
2.
为了提高牛巴贝斯虫核酸探针的检测性能,制备了地高辛标记的牛巴贝斯虫Ｃ１５Ａ核酸探针。该探针检测牛巴贝斯虫ＤＮＡ的灵敏度为３２ｐｇ,检测探针ＤＮＡ的灵敏度为０．１ｐｇ;检测其他对照血液原虫（双芽巴贝斯虫、边缘无浆体、瑟氏泰勒虫、伊氏锥虫、卵圆巴贝斯虫）和牛血细胞的ＤＮＡ,均未出现非特异性反应。与光敏生物素标记的牛巴贝斯虫Ｃ１５Ａ核酸探针比较,光敏生物素标记探针能检出１０％带虫血１２．５μＬ,而地高辛标记探针能检出１０％带虫血０．０１５μＬ,且杂交背景浅,显色深。 相似文献
3.
猪细小病毒分离,核酸探针研制及应用 总被引：11，自引：0，他引：11
采用分子克隆技术制备了ＰＰＶ－ＤＮＡ－Ｃ片段（ＰＰＶ－ＲＦ－ＤＮＡ,经Ｐｓｔ Ｉ／Ｈｉｎｄ Ⅲ的双酶切片段,称为Ｃ片段）及含Ｃ片段的ＰＵＣ１９重组质粒（ＰＵＰ）,利用地高辛标记,分别制备探针２和探针１。对猪细小病毒ＤＮＡ进行斑点杂交,两种探针均为阳性,而对照的猪瘟病毒、猪伪狂犬病毒、乙型脑炎病毒及ＰＫ－１５细胞的核酸均为阴性。并且后一种探针的敏感性高于前者,两种探针的ＤＮＡ检出限量分别为４０ｐｇ和 相似文献
4.
禽弯曲菌病的最新研究进展吴传清，谢三星（安徽农学院２３００３６）禽弯曲菌病是由弯曲菌属（Ｃａｍｐｙｌｏｂａｃｔｅｒ）空肠弯曲菌（Ｃ．Ｊｅｊｕｎｎｉ）引起的一种肠道传染病。本病以腹泻和肝炎变化为主要特征。在引起人类食物中毒的细菌中，由弯曲菌引起人们肠炎... 相似文献
5.
用PCR技术从同一兔出血症病料扩增和检出2种病毒核酸 总被引：1，自引：0，他引：1
应用 Ｐ Ｃ Ｒ 和 Ｒ Ｔ Ｐ Ｃ Ｒ 技术，对兔出血症病毒核酸作了鉴定。分别设计合成 ２ 对 Ｐ Ｃ Ｒ 扩增特异性引物，即按兔出血症病毒中国分离的 Ｎ Ｊ株核酸序列合成 １ 对引物（ Ｎ Ｊ引物），按德国分离的 Ｆ Ｒ Ｇ 株核酸序列合成另 １ 对引物（ Ｆ Ｒ Ｇ 引物），进行 Ｐ Ｃ Ｒ 和 Ｒ Ｔ Ｐ Ｃ Ｒ。从纯化的病毒核酸样品和感染 Ｄ Ｊ Ｒ Ｋ 细胞的病毒核酸样品中，均扩增出 ２ 对引物范围内的特异性核酸片段， Ｎ Ｊ引物扩增产物为 ３６４ ｂｐ， Ｆ Ｒ Ｇ 引物扩增产物为 ５１３ｂｐ。模板用 Ｒ Ｎａｓｅ 消化后，仍出现 ３６４ ｂｐ 带，用 Ｄ Ｎａｓｅ Ｓ１ 消化，则此带消失；反之，用 Ｄ Ｎａｓｅ Ｓ１ 消化，出现５１３ ｂｐ 带，用 Ｒ Ｎａｓｅ 消化，则此带消失，证实前者模板为 Ｄ Ｎ Ａ，后者为 Ｒ Ｎ Ａ。 Ｓｏｕｔｈｅｒｎ 杂交试验证实， Ｐ Ｃ Ｒ扩增出的核酸片段与各自的地高辛标记特异性探针发生强阳性杂交反应。由此认为，在兔出血症病毒感染中，同时存在着 ２ 种不同核酸型的病毒。 相似文献
6.
地高辛标记的核酸探针检测EDS病毒的研究 总被引：1，自引：0，他引：1
地高辛标记的核酸探针检测ＥＤＳ病毒的研究王雪敏（邯郸农业高等专科学校牧医系河北永年０５７１５０）郑明球蔡宝祥陈溥言（南京农业大学动物医学院１材料与方法１．１地高辛标记的ＥＤＳ病毒核酸探针制备将ＥＤＳ病毒ＮＥ４株（南京农大传染病教研室提供）鸭胚尿囊液（... 相似文献
7.
产蛋下降综合征（EDS－76）病毒DNA探针的制备及应用研究 总被引：2，自引：0，他引：2
用纯化的产蛋下降综合征（ＥＤＳ－７６）病毒（Ｈ９１毒株）悬液提取的核酸，经琼脂糖凝胶电泳只出现１条分子量较大、背景清晰的核酸带。用ＢａｍＨＩ酶消化产生４个片段，大小分别为１７ｋｂ、１０ｋｂ、４．０ｋｂ和２．０ｋｂ。将其中的２．０ｋｂ片段克隆进ｐＵＣ１８ＤＮＡ载体中，重组质粒ＤＮＡ用ｄｉｇｏｘｉｇｅｎｉｎ标记作为ＤＮＡ探针，在ｄｏｔｂｌｏｔ中该探针不与鹅胚尿囊液核酸抽提物、马立克氏病病毒（ＭＤＶ）ＤＮＡ、鸡传染性贫血病毒（ＣＡＶ）ＤＮＡ、ＳＰＦ鸡基因组ＤＮＡ等核酸反应，只与３株ＥＤＳ病毒（ＥＤＳ标准毒株ＡＶ－１２７、ＥＤＳＨ９１毒株和从健康鹅体中分离的ＥＤＳＹ８１毒株）ＤＮＡ呈阳性反应。人工感染产蛋母鸡和雏鸡后２４ｈ即可用该探针从泄殖腔棉拭子样品中检测出ＥＤＳ病毒ＤＮＡ，在感染后３５ｈ仍能从部分感染鸡样品中检出。对部分探针检测阳性鸡的泄殖腔棉拭子样品用ＳＰＦ鸡胚分离病毒，并用ＨＡ和ＨＩ试验检测分离病毒的特异性；在感染过程中，同时检测了血清中ＨＩ抗体的消长情况。结果表明，人工感染鸡排毒至少可以维持２个月左右，而且血清中ＨＩ抗体即使很高，也不能阻止感染鸡的排毒。 相似文献
8.
地高辛标记PPV—DNA—C及PUP重组质粒探针的比较研究 总被引：1，自引：0，他引：1
应用分子克隆技术制备的猪细小病毒复制型ＤＮＡ的ＰｓｔⅠ／ＨｉｎｄⅢ双酶切片段Ｃ及被克隆到ＰＵＣ１９中的Ｃ片段形成的重组质粒ＰＵＰ利用非放射性的地高辛标记后制备两种探针。分别对不同来源的猪细小病毒ＤＮＡ及ＰＵＰ重组质粒于硝酸纤维素膜上打点杂交，免疫呈色后均为阳性反应，而对照的猪瘟病毒、乙型脑炎病毒、伪狂犬病毒、ＰＫ－１５细胞的核酸均为阴性反应。通过对已知量的ＰＰＶ－ＤＮＡ检测发现Ｃ探针及ＰＵＰ探针的最低检出限量分别为４０ｐｇＤＮＡ和４ｐｇＤＮＡ。重组质粒ＰＵＰ探针比双酶切后的Ｃ片段探针敏感１０倍 相似文献
9.
HRP直接标记属特异性基因探针检测沙门氏菌的研究 总被引：2，自引：2，他引：0
以活化辣根过氧化物酶复合物（ＨＲＰ—ＰＢＱ—ＰＥＩ＋—ＮＨ３＋）直接标记沙门氏菌属特异性ＤＮＡ探针ｐＬＳ２和ｐＬＳ３，探针与靶ＤＮＡ杂交后催化发光底物，经增强型化学发光反应（ＥＣＬ），用普通Ｘ光胶片自显影（ＣＰＤ）检测沙门氏菌。经狭缝杂交（Ｓｌｏｔｂｌｏｔ），该法标记探针均可检测到０．１ｐｇ的纯质粒ＤＮＡ及１０３个未经培养的鼠伤寒沙门氏菌。Ｄｏｔ—ｂｌｏｔ杂交结果证明，ＨＲＰ标记的探针仅与沙门氏菌属细菌杂交，而与试验的其他肠道非沙门氏菌不杂交。本研究表明，ＨＲＰ直接标记基因探针化学发光自显影法检测沙门氏菌，安全、快速、简便，且有高度的敏感性和特异性，是一种有较大应用前景的非放射性标记探针杂交检测方法。 相似文献
10.
产蛋下降综合征（EDS—76）病毒DNA探针的制备及应用研究 总被引：7，自引：2，他引：5
用纯化的产蛋下降综合征（ＥＤＳ－７６）病毒（Ｈ９１毒株）悬液提取的核酸，经琼脂糖凝胶电泳只出现了１条分子量较大、背景清晰的核酸带。用Ｂａｍ ＨＩ酶消化产生４个片段，大小分别为１７ｋｂ、１０ｋｂ、４．０ｋｂ和２．０ｋｂ。将其中的２．０ｋｂ片段克隆进ｐＵＣ１８ＤＮＡ载体中，重组质粒ＤＮＡ用ｄｉｇｏｘｉｇｅｎｉｎ标记作为ＤＮＡ探针，在ｄｏｔ ｂｌｏｔ中该探针不与鹅胚尿囊液核酸抽提物、马立克氏病病毒（ＭＤ 相似文献
11.
空肠弯曲杆菌是一种人畜共患的食物源性病原菌，可引起人和动物细菌性腹泻，且该菌的感染率逐年递增。鞭毛是细菌菌体的一种特殊结构，与菌体的运动性密切相关，有助于其躲避有害环境，同时鞭毛在细菌的致病性等方面也起着重要作用。研究发现，空肠弯曲杆菌的发病机制与鞭毛在宿主上皮细胞的定植力、黏附、侵袭力及毒素的产生密切相关。文章概述了空肠弯曲杆菌鞭毛结构、功能、调控机制及相关基因等方面的研究进展，通过归纳总结已知基因缺失突变对鞭毛的影响，从分子水平了解鞭毛的调控机制，从而探讨空肠弯曲杆菌的致病机理，以期为降低其感染率提供理论依据。 相似文献
12.
Thermotolerant Campylobacter spp., in particular Campylobacter jejuni, are among the most frequently identified pathogens, found to be causing human gastrointestinal infections in Europe, with the Czech Republic being no exception. The presented work aimed at assessing results of the first nationwide monitoring of prevalence and antibiotic resistance of Campylobacter spp. in broiler flocks in the Czech Republic, including a comparison of antibiotic resistance of C. jejuni isolates collected from poultry and the human community. The monitoring was carried out in poultry slaughterhouses in 2006 and 2007. From broilers, cloacal swabs were collected and examined. The human isolates of C. jejuni were acquired from rectal swabs in community patients with diarrhoeal diseases. Suspected isolates of both animal and human origin were confirmed by the PCR methods. Antibiotic resistance to selected anti-microbial agents was tested by the microdilution method. In the monitored period, the prevalence of thermotolerant Campylobacter spp. in broilers in the Czech Republic reached almost 50%. In 2006, C. jejuni was detected in 46% and Campylobacter coli in 3% of the tested samples. In 2007, C. jejuni was found in 43% and C. coli in 2% of the samples. The results of anti-microbial susceptibility testing of C. jejuni showed higher resistance in animals when compared with humans. The only exception was tetracycline with higher resistance in isolates of human origin. The highest resistance detected was to quinolone antibiotics. Resistance to oxolinic acid was 77% in animal and 60% in human isolates, to ciprofloxacin 72% in isolates from poultry and 55% in those from humans. In ampicillin, 26% of poultry isolates and 16% of human isolates were resistant. Moreover, 9% of animal isolates demonstrated resistance to streptomycin, undetected in human isolates. In erythromycin, resistance was found in 6% of poultry and 1% of human isolates. 相似文献
13.
In order to develop an indirect ELISA method to detect Campylobacter jejuni antibody, PEB1A gene of Campylobacter jejuni was cloned and amplified by PCR, the prokaryotic expression vector pET32a-PEBIA was constructed, and then transferred into the expression strain E.coli BL21 (DE3), and obtained about 47 ku of soluble protein. Western blotting result showed that the expressed recombinant protein had good biological activity, an indirect ELISA method for detecting antibody against Campylobacter jejuni was developed using expressed PEB1A protein as coating antigen,and detected its specificity, sensitivity, repeatability, respectively. The results showed that the established method for detection of Campylobacter jejuni antibody critical value was 0.3424. This method only specifically reacts with Campylobacter jejuni positive sera, and had no cross-reactivity with other antiserum and strong specificity. In addition, the coefficients of variations in both inter-and intra-assay were less than 5% indicating that it had good repeatability and stability. The establishment of this method could be applied to the rapid detection of Campylobacter jejuni in serum, and provided basis for further prevention and control of Campylobacter jejuni diarrhea. 相似文献
14.
为了建立检测血清中空肠弯曲菌（Campylobacter jejuni）抗体的间接ELISA方法,试验通过PCR扩增并克隆空肠弯曲菌PEB1A基因,构建原核表达载体pET32a-PEB1A,将该表达载体转化大肠杆菌BL21（DE3）感受态细胞,诱导表达获得约47 ku的可溶性目的蛋白,通过Western blotting证明所表达的重组蛋白具有良好的生物学活性。以纯化后的重组蛋白作为包被抗原,建立空肠弯曲菌抗体间接ELISA方法,对其特异性、敏感性、重复性进行检测。结果表明,本试验建立的空肠弯曲菌抗体间接ELISA检测方法临界值为0.3424,本方法仅与空肠弯曲菌阳性血清发生特异性反应,与其他抗血清无交叉反应,具有较强的特异性,批内、批间的重复性试验变异系数均<5%,具有较好的重复性和稳定性。该方法的建立可应用于血清中空肠弯曲菌抗体的快速检测,为进一步防制空肠弯曲菌腹泻提供依据。 相似文献
15.
The current study aimed at determining the prevalence and the antimicrobial resistance profiles of thermophilic Campylobacter spp. infecting broiler chickens. A total of 240 caecal samples from six slaughterhouses were examined for the presence of Campylobacter spp. C. jejuni was detected in 40.4% (97/240) of the samples and C. coli in 12.1% (29/240). The agar disc diffusion method and the E-test were used for testing the antimicrobial susceptibility of C. jejuni and C. coli isolates. C. jejuni isolates were most resistant to nalidixic acid (79.4%) followed by tetracycline (76.3%), ciprofloxacin (74.2%) and enrofloxacin (15.5%). Among the C. coli isolates, the frequency of resistance to nalidixic acid and ciprofloxacin was the same at 65.5%. The predominant profiles of multidrug resistance to three or more antimicrobials in C. jejuni and C. coli were determined as tetracycline/nalidixic acid/ciprofloxacin resistance (48.5%) and tetracycline/nalidixic acid/ciprofloxacin/enrofloxacin resistance (51.7%), respectively. To prevent the transmission of antimicrobial-resistant bacteria of animal origin to humans, it should be noted that high proportions of multidrug resistance were found in both species. 相似文献
16.
Marja-Liisa Hnninen 《Acta veterinaria Scandinavica》1982,23(3):425
The effectiveness of 4 enrichment media for the recovery of low levels of inoculated cells of Campylobacter jejuni was evaluated. The media contained antibiotics or antibiotics and bile acids as selective compounds. Three of the media recovered most of the inoculated low numbers of 6 C. jejuni strains. In the 3 media the growth rate of 3 strains, indicated by the increase in the log number of cells during 24 h or 48 h incubation at 42 ° C, was about the same as in the control medium without selective compounds. The same 3 media also recovered a low number of Campylobacter cells from artificially contaminated raw milk or ground meat samples. The enrichment medium B containing 40 I.U. Colistin, 5 μg novobiocin, 2 mg Na-cholic acid and 50 mg cycloheximide per ml was inhibitory for most Campylobacter strains studied. 相似文献
17.
A Engvall A Bergqvist K Sandstedt M L Danielsson-Tham 《Acta veterinaria Scandinavica》1986,27(4):540-547
Eight of 16 conventional broiler-chicken flocks examined contained Campylobacter. All isolates were identified as C. jejuni except from 1 flock were C. coli was isolated. One herd consisting of 6 different houses where Campylobacter regularly has been isolated was continuously examined. It was not possible to isolate Campylobacter from newly hatched chickens or from environmental samples and cloacal swabs during the 2 first weeks of growth. 相似文献
18.
19.
根据沙门氏菌、空肠弯曲杆菌和单核增生李斯特氏菌的保守基因序列,设计特异性引物和以不同荧光素标记的探针。通过对荧光PCR反应体系和反应条件的优化筛选,建立了检测沙门氏菌、空肠弯曲杆菌和单核增生李斯特氏菌的三重荧光PCR检测方法。为了评价所建立的实时PCR检测体系的特异性,试验中选取了阳性菌株及干扰菌株进行特异性验证。同时对梯度稀释的纯化DNA和不同浓度引物探针进行检测以确定方法的灵敏度。结果表明,该方法有效、特异、敏感、稳定,对于动物产品中沙门氏菌、空肠弯曲杆菌和单核增生李斯特氏菌的快速检测具有重要应用价值。 相似文献
20.
Campylobacter jejuni (C.jejuni) is a major pathogen of human campylobacteriosis, as well as one of the major food-borne pathogen. It can not only cause human diarrhea, but also cause many systemic diseases such as endocarditis, arthritis, septisis. The most serious complication it can cause is the Guillain Barre syndrome. In developed countries, C.jejuni even has a trend to excess Salmonella and be reported as next Salmonella, which has caused a worldwide concern. Analysis of biological characteristics for C.jejuni can help us to distinguish it with other pathogens. Typing methods play important roles in the identification, monitoring and prevention of C.jejuni. It can also help us to understand its virulence and resistance mechanisms to C.jejuni. This paper reviews advances of C.jejuni in biological characteristics, serotyping and genotyping methods so as to help us further understand its new progress in these areas. 相似文献