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为了建立基于SYBR Green Ⅰ的快速检测副猪嗜血杆菌(HPS)的实时荧光定量PCR方法,参照GenBank公布的HPS的infB基因序列(DQ:781933.1),设计特异性引物;提取HPS基因组,进行PCR扩增,回收目的片段;构建阳性标准模板,建立标准曲线;验证其敏感性、重复性和特异性。结果显示,本试验得到了阳性标准质粒,并建立了标准曲线,线性关系在102copies/μL～108copies/μL检测范围内良好;该方法敏感性达到10copies/μL,比常规PCR高100倍,重复性试验变异系数均小于2.5%,同时对HPS具有良好的特异性。结果表明,本试验建立的副猪嗜血杆菌SYBR GreenⅠ荧光定量PCR检测方法可用于临床对HPS的快速诊断和定量检测。 相似文献
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采用PCR方法扩增PPV6保守区域基因252bp,将其克隆到pClon007载体,构建重组质粒作为标准阳性质粒。以质粒模板建立PPV6的SYBR GreenⅠreal-time PCR检测方法,并进行敏感性、特异性和重复性等验证。结果表明,重组质粒特异性好;建立的real-time PCR方法Ct值与标准品模板在8.80×109~8.80×101 copies/μL范围内呈良好的线性关系,相关系数为0.993,斜率为-4.320。该方法检测灵敏度可达8.80×101 copies/μL。该方法对JEV、PRV、PRRSV、PCV2、FMDV等猪常见病原检测均无特异性扩增;对临床样品的检测结果表明,所建立的荧光定量PCR阳性检测率为40.63%。本试验成功建立了PPV6SYBR Green I real-time PCR检测方法,可实现对PPV6快速灵敏的诊断。 相似文献
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《四川畜牧兽医》2021,(2)
为建立快速、灵敏、特异的检测羊口疮病毒(ORFV)的方法,基于羊口疮病毒保守序列B2L基因合成一对用于建立SYBR Green Ⅰ实时荧光定量PCR的特异性引物,将ORFV B2L全长基因和pMD19-T质粒载体连接,构建重组阳性质粒,以构建的重组质粒DNA作为模板,建立ORFV SYBR Green Ⅰ实时荧光定量PCR检测方法。结果显示:所建立的ORFV SYBR Green Ⅰ实时荧光定量PCR方法线性关系良好,重复性好,扩增效率高,无引物二聚体和非特异性扩增,最低检测限为2.13×101copies/μL,比普通PCR高出1 000倍,该方法对绵羊羊痘病毒和山羊痘病毒的核酸cDNA不检出,特异性好;对180份山羊全血样本进行ORFV检测,结果得出常规PCR阳性检出率为2.8%(5/180),荧光定量PCR阳性检出率为4.4%(8/180)。试验表明,本次建立的ORFV SYBR Green Ⅰ实时荧光定量PCR方法特异性强、敏感度高、重复性好,适用于羊口疮病毒临床样本的检测。 相似文献
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为了建立一种快捷、特异、敏感的检测猪圆环病毒3型(PCV3)的SYBR GreenⅠ实时荧光定量PCR方法,根据GenBank公布的PCV3全基因组序列,在rep基因高度同源保守区设计并合成1对特异性引物,从阳性病料DNA中PCR扩增PCV3rep基因。PCR产物克隆入pMD~18-T载体中,构建重组质粒(pMD18-PCV3rep),转化到大肠杆菌DH-5α中。经PCR及测序鉴定后得到阳性重组质粒,作为荧光定量PCR的标准品模板,经过反应条件优化,建立了检测PCV3的SYBR GreenⅠ荧光定量PCR方法。该检测方法线性关系良好,R2=0.998 2;仅PCV3阳性病料出现特异性扩增,而与另外6种病原无交叉反应;该方法检测下限为21.9copies/μL;批间及批内变异系数分别为0.394%~0.935%和0.112%~0.775%,均小于1%。经临床应用证实,该方法具有良好地特异性、敏感性和稳定性,为PCV3的早期检测、定量检测及后期研究提供了技术支持。 相似文献
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为了建立高效、灵敏的猪流行性腹泻病毒(PEDV)检测方法,本研究从GenBank数据库中获取PEDV N基因序列,扩增出PEDV N基因标准质粒,并在N基因的保守区域内设计了一对特异性荧光定量引物,成功建立了SYBR Green I实时荧光定量PCR检测方法。经过一系列试验表明,该检测方法线性关系良好,R2值为0.99;特异性强,敏感性高,最低可检测至2.23 copies/μL,比普通PCR灵敏约100倍;重复性好,组内变异系数为0.25%～0.43%,组间变异系数为0.67%～0.97%;对于各地区96份临床样品检测出PEDV阳性率为25%。本研究建立的实时荧光定量PCR检测方法为PEDV的临床诊断、流行病学调查以及定量研究提供了有效的检测工具。 相似文献
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为了建立猪圆环病毒2型（PCV2）SYBR Green I荧光定量PCR检测方法,采用PCR扩增PCV2 ORF2基因242 bp片段,并克隆入pMD18-T载体中,以纯化的重组质粒为模板作荧光定量PCR扩增,建立了PCV2荧光定量PCR检测方法,该方法检测灵敏度可达1.2×101拷贝/μL,与猪圆环病毒1型（PCV1）、猪瘟病毒（CSFV）、猪蓝耳病病毒（PRRSV）、猪细小病毒（PPV）、猪伪狂犬病病毒（PRV）、乙型脑炎病毒（JEV）核酸均不发生扩增反应,具有很好的特异性和重复性。结果表明：建立的PCV2实时荧光定量PCR检测方法具有特异、敏感、快速、定量、重复性好等优点,可用于临床PCV2的检测。 相似文献
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为建立检测牛传染性鼻气管炎病毒(IBRV)的荧光定量检测方法，本研究根据IBRV gE基因的序列设计了相应的探针和引物，分别建立TaqMan-MGB探针和SYBR GreenⅠ荧光定量PCR方法，并对2种方法进行了综合比较。结果显示，TaqMan-MGB探针和SYBR GreenⅠ定量荧光PCR方法的灵敏度分别达到1.0×101 copies/μL和1.0×102 copies/μL;2种荧光定量方法对除IBRV的其他牛病毒和细菌检测结果均为阴性；重复性检测中变异系数均小于2.3%;检测了130份来自西藏的牦牛样品，2种荧光定量PCR阳性检出率均为100%。以上结果表明，2种荧光定量方法都可用于检测IBRV,且TaqMan-MGB荧光定量PCR敏感性高于SYBR GreenⅠ荧光定量PCR。 相似文献
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为建立一种快速高效的猪肺炎支原体（Mycoplasma hyopneumoniae,Mhp）检测方法,根据NCBI公布的Mhp保守序列设计4对特异性引物,依据4对引物的荧光定量PCR检测结果及拟合曲线进行相关性分析,筛选出最佳引物（SX4）,建立了Mhp SYBR Green Ⅰ实时荧光定量检测方法。该方法可特异性检测Mhp,对猪圆环病毒2型、猪细小病毒、猪伪狂犬病病毒、副猪嗜血杆菌4型及链球菌2型等病原均无特异性扩增;最佳引物SX4检测的灵敏度可达4.9×101 copies/μL,组内和组间变异系数均小于2%。该方法可稳定检测出工艺生产抗原和市售疫苗中的Mhp菌量。试验表明,本研究成功建立了Mhp SYBR Green Ⅰ实时荧光定量检测方法,其特异性强、灵敏度高、重复性好,可用于Mhp疫苗抗原生产和临床疫苗中的Mhp菌量检测。 相似文献
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本试验旨在建立一种检测猪A组轮状病毒的SYBR Green I实时荧光定量PCR方法.参考GenBank上登录的猪轮状病毒OSU株的VP6基因序列保守区设计一对特异性引物,通过RT-PCR方法克隆目的基因,并将其连入pMD 19-T Vector,制备阳性标准品,优化反应条件.建立的方法在1.0×102～1.0×109拷贝/μL范围内线性关系良好,反应扩增效率大于90％,扩增相关系数大于0.98.对猪瘟病毒、猪繁殖与呼吸综合征病毒、猪传染性胃肠炎病毒及猪圆环病毒2型均检测不到荧光信号,表明该方法特异性强.该方法批内和批间变异系数均小于2％,重复性好.结果表明,建立的SYBR Green I实时荧光定量PCR方法可为A组猪轮状病毒早期感染的诊断及病毒定量分析提供技术支持. 相似文献
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《猪业科学》2015,(4)
为了建立猪圆环病毒2型(PCV2)SYBR GreenⅠ荧光定量PCR检测方法,采用PCR扩增PCV2 ORF2基因242 bp片段,并克隆入pMD18-T载体中,以纯化的重组质粒为模板作荧光定量PCR扩增,建立了PCV2荧光定量PCR检测方法,该方法检测灵敏度可达1.2×10~1拷贝/μL,与猪圆环病毒1型(PCV1)、猪瘟病毒(CSFV)、猪蓝耳病病毒(PRRSV)、猪细小病毒(PPV)、猪伪狂犬病病毒(PRV)、乙型脑炎病毒(JEV)核酸均不发生扩增反应,具有很好的特异性和重复性。结果表明:建立的PCV2实时荧光定量PCR检测方法具有特异、敏感、快速、定量、重复性好等优点,可用于临床PCV2的检测。 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