共查询到20条相似文献，搜索用时 62 毫秒
1.
拟建立施马伦贝格病毒(SBV)S基因焦磷酸测序检测方法,用于施马伦贝格病毒病的快速检测和确诊。通过对公开发表的SBVS基因序列与布尼病毒科其他11种病毒S基因进行比对,找出不同病毒变异区域集中且变异区域两侧保守的序列片段,基因合成,体外转录,作为基因扩增模板。在特异性变异序列两端的保守区域设计扩增引物,进行RT-PCR扩增。在保守区域设计双向测序引物,对RT-PCR产物进行双向焦磷酸测序。通过比对测序结果,确定是否为SBV核酸序列;优化条件,确定检测方法的敏感性、特异性和重复性,建立SBVS基因焦磷酸测序检测方法。结果:建立的施马伦贝格病毒病焦磷酸测序检测方法扩增基因片段长度为166bp;敏感性为可检测到104个拷贝;每一条测序引物可准确测出50bp左右核酸序列,双向测序可准确测出100bp左右核酸序列,具有较好特异性,完全满足施马伦贝格病毒病确诊要求;重复测序3次,均能准确测出100bp左右核酸序列。本研究建立的施马伦贝格病毒病焦磷酸测序检测方法,可用于施马伦贝格病毒病的检测和确诊,整个检测过程可在1d内完成,大大缩短了确诊时间。 相似文献
2.
《中国兽医学报》2016,(6)
根据GenBank公布的施马伦贝格病毒S基因序列,设计特异性引物,构建施马伦贝格病毒S基因重组克隆质粒作为阳性对照,经各反应条件的优化以及特异性、敏感性和重复性试验,建立了施马伦贝格病毒套式RT-PCR检测方法。结果表明,本研究建立的套式RT-PCR方法可特异性的检测施马伦贝格病毒,且与BTV、EHDV、AKV、BVDV、IBRV等其他病毒的核酸不发生交叉反应。每个反应可检测到相当于6.65×102 copies/μL施马伦贝格病毒重组克隆质粒。与传统的病毒分离及血清学方法相比较,不但耗时短(仅需5h),而且费用低廉。本研究建立的套式RT-PCR方法具有特异、敏感、重复性好、快速、费用低廉等优点,是施马伦贝格病毒快速初筛的良好方法。 相似文献
3.
《中国兽医学报》2015,(11):1765-1769
依据施马伦贝格病毒(Schmallenberg virus,SBV)S基因保守序列,设计了特异性引物和MGB荧光探针,建立了SBV实时荧光RT-PCR检测方法,构建标准曲线,进行特异性、敏感性和重复性等试验评价,并对绵羊和牛全血样品进行了检测。结果表明,所建立的SBV检测方法模板浓度与Ct值呈现良好的线性关系,相关系数R2为0.998;特异性强,仅对SBV RNA出现特异性扩增曲线;灵敏度高,对SBV RNA的检测灵敏度为10copies;重复性好,重复检测灵敏度CV3%;对临床样品的检测均为SBV阴性。所建立的SBV实时荧光RT-PCR方法可以为SBV的诊断和流行病学调查提供一种快速、特异、敏感的检测手段。 相似文献
4.
通过对施马伦贝格病毒(Schmallenberg virus,SBV)及其同属各病毒基因序列进行比对分析,设计了针对SBV S基因节段的一组6条特异性引物,经优化建立了SBV RT-LAMP检测方法,可在63℃恒温条件下,于50min内完成目的序列扩增,通过染料法和琼脂糖凝胶电泳法观察结果,其灵敏度可达10TCID50,与荧光RT-PCR方法具有相同的敏感性。特异性试验显示,本方法与同属的沙门达病毒(Shamonda virus)会发生交叉反应,需借助沙门达病毒S基因节段上的一个特异性酶切位点Afl II进行酶切,实现两者的鉴别诊断。对103份临床样品的检测结果显示,本方法与荧光RT-PCR方法符合率为100%。本研究建立的RT-LAMP方法快速、简单、灵敏度高,不仅适用于实验室鉴定,还可应用于口岸、野外等的临床大规模监测。 相似文献
5.
《现代畜牧兽医》2021,(2)
为同时检测小反刍兽疫病毒(PPRV)、裂谷热病毒(RVFV)及施马伦贝格病毒(SBV) 3种外来动物疫病病原,根据GenBank相关病毒序列设计引物及探针,建立PPRV、RVFV、SBV三重普通RT-PCR及三重实时荧光定量RT-PCR检测方法,并初步应用于临床检测。结果显示:所建立的PPRV、RVFV、SBV三重普通RT-PCR方法可同步特异性检测PPRV、RVFV、SBV,检测敏感度可达10~3 copies/μL DNA;对临床症状相似的羊痘、羊口疮、口蹄疫、阿卡斑、蓝舌病及鹿流行性出血热等病毒未有扩增。所建立的PPRV、RVFV、SBV三重实时荧光定量RT-PCR方法对PPRV、RVFV、SBV有特异荧光信号,检测敏感度可达10~(1.33)～10~(2.13) copies/μL DNA;而对临床症状相似羊痘、羊口疮、口蹄疫、阿卡斑、蓝舌病及鹿流行性出血热等病毒未有荧光信号。应用PPRV、RVFV、SBV三重实时荧光定量RT-PCR方法检测925份临床样本,检出一例PPRV阳性样本,经常规RT-PCR扩增及序列测定Blast确定为PPRV谱系IV型毒株。研究所建立的PPRV、RVFV、SBV三重普通RT-PCR方法和三重实时荧光定量RT-PCR方法可同步特异性检测3种病原,并初步应用于临床样本的检测。 相似文献
6.
参照NCBI公布的施马伦贝格病毒(SBV)的N基因开放阅读框序列,设计了一对含特异性酶切位点的引物,扩增SBV N基因,将其克隆于昆虫杆状病毒表达载体p Fast Bac HTB,然后以该重组质粒转化DH10Bac感受态细胞,得到重组穿梭质粒Bacmid-SBV-N,将该重组穿梭质粒在脂质体介导下转染Sf 9昆虫细胞,得到表达SBV重组N蛋白的杆状病毒。通过SDS-PAGE和Western blot对重组N蛋白进行鉴定,表明该蛋白得到表达。本研究为以SBV核蛋白为基础的相关检测方法的建立提供了物质基础。 相似文献
7.
《中国预防兽医学报》2017,(7)
为建立病毒性出血性败血症病毒(VHSV)焦磷酸测序检测技术,本研究通过对VHSV靶基因特异性序列的同源性分析,设计出适合焦磷酸测序特异性扩增和测序的引物,对焦磷酸测序反应体系和反应程序进行优化,建立了VHSV焦磷酸测序检测方法。结果表明,该方法仅对目的病毒基因扩增,而对其它病毒检测为阴性,表明该方法特异性好;该方法最低检出核酸量为82拷贝/μL,灵敏度高。选取国内采集与进口的鱼类样本共计1924批次进行VHSV检测,结果显示,焦磷酸测序检测方法检测结果与常规RT-PCR一致,该方法的特异性和灵敏度可以满足水生动物疫病检测的需要。 相似文献
8.
旨在建立一种基于PCR的焦磷酸测序检测方法,用于斑点叉尾鮰病毒病的快速检测和确诊。针对斑点叉尾鮰病毒(CCV)蛋白激酶(PK)基因的保守区域设计扩增引物与测序引物,经PCR扩增后对PCR产物进行焦磷酸测序,借助测序结果比对确定是否为CCV核酸序列。通过对反应条件与体系的优化,成功建立了CCV PK基因焦磷酸测序检测方法。结果表明:建立的斑点叉尾鮰病毒焦磷酸测序检测方法扩增基因片段长度为144 bp,能够特异性检测出目的病毒,最低核酸检测限为5×10-6ng/μL,重复测序3次均能准确测出45 bp核酸序列。本研究建立的斑点叉尾鮰病毒焦磷酸测序检测方法特异性强、灵敏度高、重复性好,适合高通量检测且耗时短仅需4 h,为CCV的快速检测提供了一种可行方法。 相似文献
9.
《黑龙江畜牧兽医》2010,(5)
为了检测感染辽西地区中华蜜蜂的囊状幼虫病病毒(Sacbrood bee virus,SBV),克隆辽西地区中华蜜蜂囊状幼虫病病毒部分结构基因并分析,试验设计中华蜜蜂囊状幼虫病病毒5′端2对特异性引物,用Trizol法提取囊状幼虫病病毒总RNA,通过RT-PCR方法扩增病毒基因组的部分序列,转入pMD18-T载体进行克隆扩增后测序。结果表明:测序的SBV部分基因总长831bp,编码序列长496bp,与我国广东省的病毒序列同源性为94%;根据不同地区此病毒5′端序列进行遗传进化分析,发现至少有3个不同的蜜蜂囊状幼虫病病毒基因型。结果说明不同地区SBV5′端结构基因存在的差异可能与致病性有关。 相似文献
10.
《中国预防兽医学报》2015,(6)
为建立稳定表达施马伦贝格病毒(SBV)核衣壳(N)蛋白的BHK-21细胞系,本研究在SBV-N蛋白编码基因的C端加入6个组氨酸(6×His)标签,将其克隆至慢病毒载体p LV-EGFP-C中构建重组慢病毒质粒p LV-EGFP-SBV-N,将其与慢病毒包装质粒p Helper1.0和p Helper2.0共转染HEK-293T细胞,包装表达SBV-N蛋白的慢病毒。将重组慢病毒在聚凝胺(Polybrene)的介导下感染BHK-21细胞,采用嘌呤霉素(Puromycin)法和细胞有限稀释法筛选出一株稳定表达SBV-N蛋白的BHK-21细胞系,命名为BHK-21-EGFP-SBV-N。间接免疫荧光试验进一步表明,该细胞系能够被SBV抗体阳性动物血清和特异性单克隆抗体2C8识别。稳定表达SBV-N蛋白的BHK-21细胞系的建立,为SBV血清学检测方法的建立提供材料。 相似文献
11.
12.
13.
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
14.
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
15.
16.
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
17.
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
18.
19.
20.
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