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《中国动物传染病学报》2017,(4)
由猪肺炎支原体(Mycoplasma hyopneumoniae)引起的慢性肺炎是最难净化的疫病之一,它流行广、感染率高,对养猪业危害巨大。为了加强口岸现场查验动物源性产品中猪肺炎支原体的力度,本研究建立了猪肺炎支原体环介导等温核酸扩增技术(Loop-mediated isothermal amplification,LAMP)检测方法。本研究通过在LAMP反应产物中加入显色液,提高了检测结果肉眼判定的准确性,实现了结果判定可视化的目标,有助于出入境口岸货物查验现场及猪场中猪肺炎支原体的检测。 相似文献
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本研究旨在建立一种基于颜色变化的北美洲型猪繁殖与呼吸障碍综合征病毒(PRRSV)RT-LAMP检测方法及结果判定方法,方便LAMP技术的现场检测应用。根据Gen Bank中美洲型PRRSV的保守序列设计一套LAMP引物,对反应进行优化后建立了PRRSV LAMP检测方法。对比Dye63、钙黄绿素(Calcein)、SYBR Green I和Picogreen 4种核酸染料对于LAMP反应的适用性。结果显示,只有Calcein、Dye63适于LAMP反应前加入,但对扩增效率均产生一定抑制,造成反应时间延迟:Calcein的延迟作用更强(约10min),Dye63延迟作用较小(约5min)。加入Dye63的LAMP反应灵敏度为2×101拷贝,而加入Calcein的灵敏度要低10倍。经多功能酶标仪对荧光强度的检测,含Dye63的反应阴阳性差异明显,可用于LAMP反应结果的判定。据此建立的基于新型核酸染料Dye63的PRRSV RT-LAMP检测方法操作简单、方便、直观,可大大减少环境污染造成的假阳性。Dye63有望成为继Calcein之后,可用于LAMP反应前加入,反应后闭管判定的一种新核酸染料,方便LAMP检测技术现场应用。 相似文献
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猪圆环病毒2型环介导等温扩增检测方法的建立与应用 总被引：2，自引：0，他引：2
以猪圆环病毒2型为材料,设计了3对引物,构建了猪圆环病毒2型环介导等温扩增（LAMP）检测方法,并进行敏感性和特异性确定。建立的猪圆环病毒2型的LAMP检测方法,可以采用琼脂糖凝胶电泳、颜色变化、生成的沉淀等现象判定反应结果,为猪圆环病毒2型的现场快速检测提供了一种更加简便快速的方法,可以满足现场检疫的需要。 相似文献
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为建立一种检测真鲷虹彩病毒的环介导等温扩增(LAMP)方法,满足口岸、养殖场对该病的快速监测的需求,本研究比对分析了Gen Bank中公布的真鲷虹彩病毒基因组序列,筛选其主要衣壳蛋白MCP基因保守区序列,进行LAMP引物设计,建立了真鲷虹彩病毒LAMP检测方法。对扩增条件进行优化,确定最佳反应条件为62℃,45 min。灵敏度试验结果显示,该方法最低检测限为100拷贝/μL目的基因。特异性试验结果显示,该方法不与流行性造血器官坏死病毒(EHNV)、蛙病毒3型(FV3)、甲鱼虹彩病毒(STIV)发生交叉反应。结果表明,本研究建立的LAMP方法具有良好的敏感性和特异性。对5份疑似真鲷虹彩病毒感染的临床样品进行检测,发现检测结果与世界动物卫生组织(OIE)推荐的PCR方法检测结果符合率为100%。研究表明,本方法具有灵敏度高、特异性强,以及仪器设备简单、操作便捷、结果直观等优点,非常适合作为初筛手段,应用于养殖场、口岸等一线的疫病监测。 相似文献
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布鲁氏菌环介导等温扩增（LAMP）可视化检测方法的建立 总被引：1，自引：0，他引：1
应用环介导等温扩增(LAMP)技术建立了布鲁氏菌可视化快速检测方法。针对布鲁氏菌外膜蛋白OMP25基因保守区设计6条特异引物,反应前加入染料羟基萘芬蓝(HNB)作为LAMP扩增的指示剂,63℃恒温反应60min,根据HNB的颜色变化进行结果判定。分别评价所建立LAMP方法的特异性和灵敏性,并对60份牛布鲁氏菌病虎红平板凝集试验(RBT)阳性血清样本,经LAMP和B4/B5-PCR方法进行平行检测。结果显示,本方法最低检出限约为17fg布鲁氏菌基因组DNA。本方法特异性良好,布鲁氏菌反应管均出现特异性LAMP扩增反应,而猪大肠杆菌K99、巴氏杆菌C48-1、猪链球菌ST171、绿脓杆菌等对照组均未出现扩增。针对60份RBT阳性血清的平行检测结果显示,LAMP和B4/B5-PCR这两种方法间的结果符合率为85.0%。B4/B5-PCR检测为阳性的43份样品,经本方法检测全部为阳性;B4/B5-PCR检测为阴性的17份样品,经本方法检测,9份为阳性,8份为阴性。LAMP的敏感性高于B4/B5-PCR方法。实验表明,本文所建立的基于颜色判定的布鲁氏菌LAMP检测方法具有特异、灵敏、设备要求简单等特点,适用于基层兽医部门进行布鲁氏菌的快速检测。 相似文献
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为建立一种鸡毒支原体(MG)的快速检测方法,本研究根据GenBank中MG的基因保守序列,设计1套特异性环介导等温扩增(LAMP)引物,优化反应条件,建立了MG LAMP的可视化检测方法。该方法的敏感性可达10 fg/μL,高于常规PCR方法100倍;其特异性好,对其他的鸡常见病原体的检测结果均为阴性。MG LAMP反应只需一个可控温的水浴锅,在1 h内完成全部反应,通过肉眼观察颜色直接判定结果。本研究建立的LAMP方法具有灵敏度高、特异性好、操作简便的优点,可用于MG感染的快速检测。 相似文献
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根据Gen Bank中猪伪狂犬病病毒(PRV)g B基因的保守序列,设计一套特异性引物,在对反应条件进行优化后,建立了PRV环介导等温扩增(LAMP)可视化检测方法。结果显示:该方法能在常规65℃水浴锅中30 min内实现对目的片段的特异性扩增,并且可通过肉眼观察颜色直接判定检测结果 ;该方法具有很高的特异性,与猪瘟病毒、猪圆环病毒2型等均无交叉反应;该方法的敏感性可达1 fg;将该方法应用于临床样品检测,结果与普通PCR方法一致。研究表明,本研究建立的LAMP方法简便、快速、灵敏、特异,适合基层PRV感染的快速检测。 相似文献
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《畜牧与兽医》2021,(5)
旨在建立一种适用于现场快速检测非洲猪瘟病毒(ASFV)的可视化环介导等温扩增(LAMP)方法。采用针对非洲猪瘟病毒的p72基因编码区序列,设计合成2组引物,对引物进行筛选和反应条件优化,确定敏感性与特异性,并与荧光定量PCR方法进行比较。结果:建立的LAMP方法在63℃50 min内对ASFV的检测灵敏度为10 copies/μL,与猪伪狂犬病毒(PRV)、猪瘟病毒(CSFV)、猪繁殖与呼吸综合征病毒(PRRSV)、猪细小病毒(PPV)、猪圆环病毒2型(PCV2)、猪流行性腹泻病毒(PEDV)均无交叉反应;利用该方法对300份送检的临床样品进行检测,检出阳性样品8份,与荧光定量PCR检测结果一致。综上表明,本研究建立的方法具有特异性好、灵敏度高、快速、结果可视、设备适用范围广等优点,适用于ASFV现场快速检测。 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