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为了建立一种快速诊断犬瘟热病毒、犬细小病毒和犬副流感病毒的多重PCR方法,参照GenBank中的犬瘟热病毒(CDV)、犬细小病毒(CPV)、犬副流感病毒(CPIV)基因序列,设计了3对引物分别用于特异扩增犬瘟热病毒F基因、犬细小病毒VP2基因和犬副流感病毒F基因上的目的片段.通过优化反应条件,建立同时扩增CDV(740 bp)、CPV(419 bp)和CPIV(559 bp)的多重PCR方法.结果表明特异性和敏感性良好,对CDV、CPV、CPIV3种病毒的最低核酸检测量为1 ng/μL.临床样品的多重PCR检测结果表明,建立的多重PCR方法能够对CDV、CPV、CPIV单个感染或混合感染的临床样品进行快速鉴别诊断. 相似文献
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为建立快速区分3种猪圆环病毒（PCV2、PCV3和PCV4）的现场检测方法,采用微流控芯片环介导等温扩增技术（loop-mediated isothermal amplification,LAMP）,收集3种猪圆环病毒临床阳性样本进行核酸提取,与市场上3种猪圆环病毒荧光探针法检测试剂盒进行灵敏度、特异性和重复性同步比对。结果显示：微流控芯片LAMP法在3种猪圆环病毒联检测试中具有非常高的灵敏度,可以在30 min内,实现不低于荧光定量PCR法的敏感性;与非洲猪瘟病毒、猪瘟病毒、猪繁殖与呼吸综合征病毒、猪伪狂犬病毒和猪细小病毒临床阳性样本均无交叉反应,特异性好;测试3种猪圆环病毒重复性Ct值变异系数（CV）均在2%以下,稳定性好。结果表明：3种猪圆环病毒微流控芯片快速联检技术特异性好、灵敏度高、重复性强,检测速度快,环境要求低,可以满足现场检测的要求,适用于养猪场等场所的猪圆环病毒现场快速检测。本方法的建立为猪相关病原体的现场快速核酸检测提供了有力工具。 相似文献
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根据犬瘟热病毒(canine distemper virus,CDV)和犬腺病毒2型(Canineadenovirus type2,CAV-2)GeneBank登陆的基因序列各设计一对引物,经试验条件优化,建立了检测CAV-2的PCR方法和CDV的RT-PCR方法,CAV-2可扩增1108bp片段、CDV可扩增560bp的目的片段,特异性试验表明建立的方法只能特异扩增CAV-2和CDV,不能扩增犬细小病毒、犬冠状病毒、犬副流感病毒、犬钩端螺旋体和犬黄胆出血群、狂犬病病毒。敏感性试验表明,所建立的双重PCR方法可以扩增4.63ng总核酸量。在上述试验基础上继续优化条件建立了能同时检测CAV-2和CDV两种病毒的双重PCR检测方法,并用该方法检测来自辽宁、吉林等15家动物医院134份鼻液和眼眵样品,与商品化试纸条检测结果相比,本方法更加敏感和方便。研究结果表明,本实验建立的方法敏感、特异,适用于动物犬瘟热病毒和犬腺病毒2型的快速检测和鉴别诊断。 相似文献
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为建立一种快速的犬细小病毒(CPV)病原检测方法,本试验根据GenBank上登录的CPV基因序列,在保守的VP2基因内部设计合成内外2对引物,建立了检测CPV的套式PCR方法。该方法对犬瘟热病毒(CDV)、犬冠状病毒(CCoV)、犬腺病毒(CAV)、犬副流感病毒(CPIV)的扩增结果均为阴性;该检测方法最低可以检测出0.1 ng的病毒核酸,第2次比第1次扩增的敏感性高100倍。建立的套式PCR方法具有良好的特异性、敏感性,可以准确快速检测出极低含量的CPV,将为CPV的病原检测及分子流行病学调查等提供一种高效、快速、特异、灵敏的检测方法。 相似文献
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为建立犬瘟热病毒(CDV)环介导等温扩增(LAMP)检测方法,本研究根据GenBank中CDVN基因保守序列设计合成了2对LAMP引物,内引物FIP、BIP和外引物F3、B3。以CDVN基因重组质粒(pMD-CDV-N)为模板,经反应条件优化、特异性试验、敏感性试验及临床样品检测。检测结果显示,该方法于61℃水浴60min即可完成反应,最低检出量为70个拷贝,比RT-PCR灵敏10倍。该检测方法仅对CDV产生阳性扩增,而对狂犬病毒,犬细小病毒,犬腺病毒Ⅱ型扩增结果均为阴性。用建立的LAMP方法检测临床样品,检测结果与RT-PCR检测结果一致。本方法简便,特异,有利于CDV的临床检测。 相似文献
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犬细小病毒PCR诊断方法的建立及对大熊猫粪便的检测 总被引：1，自引：0，他引：1
根据GenBank中登录的犬细小病毒(CPV) VP2基因序列,设计合成1对特异性引物;以CPV疫苗株为模板,建立了一种快速检测CPV的PCR检测方法,并应用于CPV诊断.结果显示,以此对引物进行PCR扩增能得到与理论设计值大小一致的342 bp的特异性条带,对犬瘟热病毒(CDV)、犬冠状病毒(CCV)、狂犬病病毒(RV)、新城疫病毒(NDV)和猫泛白细胞减少症病毒(FPV)扩增结果均为阴性;最低可检出约1.4 pg的病毒核酸;重复性试验结果表明,其检测重复性好;对45份临床宠物犬病料进行检测,并与免疫胶体金抗原检测拭纸捡测结果进行比较,吻合率为90.0％.将此方法初步应用于大熊猫粪便中细小病毒的检测,结果表明,从熊猫基地采集的52份正常大熊猫粪便样品中有8份为细小病毒阳性,阳性率为15.3％.大熊猫是通过自然感染还是弱毒苗感染细小病毒的机制还不清楚. 相似文献
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旨在建立一种利用环介导等温扩增技术(LAMP)检测犬细小病毒感染的新方法。根据Gen-Bank中犬细小病毒(CPV)VP2基因序列,设计4条LAMP特异性引物,对反应条件、特异性、敏感性、可视化效果和应用效果进行研究。结果显示,在65℃等温条件下、1h内可完成LAMP扩增过程;病毒的最低检出限量为10-2个TCID50/mL;特异性和可视效果良好;对36份临床标本进行检测,阳性检出率为80.5%(29/36),检出率高于普通PCR 72.2%(26/36)。建立的LAMP检测方法,显示了较高的特异性和敏感性,而且兼具高效、快捷、可视化的优势,为临床检测犬细小病毒感染提供了一种快速简便的新方法。 相似文献
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为建立犬细小病毒(CPV)环介导等温扩增(LAMP)检测方法,实现CPV的早期快速诊断,本研究根据GenBank登录的CPV VP2基因序列,在其序列保守区域设计LAMP引物,利用CPV基因组DNA为模板进行扩增。结果表明:LAMP方法检测灵敏度达到10-1TCID50/mL;并且与其它细小病毒等无特异性扩增,表现出良好的特异性。与PCR技术相比,LAMP法操作更加简单方便,更适合基层和实验室的快速检测。 相似文献
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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
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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
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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
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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
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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