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A loop-mediated isothermal amplification assay was developed for the rapid detection of Myxobolus cerebralis in both fish and oligochaete hosts. The assay was optimized to amplify parasitic DNA by incubation with Bst DNA polymerase and a set of six specially constructed primers at 65 degrees C for 60 min. The amplification products were detected visually using SYBR Green I dye which gave identical results to gel electrophoresis analysis. Parasite DNA was detected from infected oligochaetes, and from the anal fin, caudal fin, dorsal fin and operculum of clinically infected fish. This 'Myxo-LAMP' assay has a detection limit similar to that of a polymerase chain reaction assay (10(-6)), but is more rapid and only requires a water bath for amplification and is therefore practical for simple and rapid diagnosis of infected tissue.  相似文献
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根据克隆得到的迟缓爱德华氏菌gyrB基因序列设计并合成一对特异性引物,通用性和特异性检测结果显示所设计的引物具有良好的种间特异性和种内通用性,构建含gyrB基因的重组质粒作为标准品,经过反应体系优化后建立了检测迟缓爱德华氏菌的SYBR Green I实时荧光定量PCR检测方法。结果显示,该方法线性关系良好,在Tm为63℃时,扩增产物的熔解曲线仅有一个单特异峰,扩增所得标准曲线为y=-3.32x 39.38,相关系数为0.998,扩增效率为1.00,最低能检测到60个拷贝。应用建立的方法对人工感染的大菱鲆病样进行了检测,三个被检样品均呈阳性反应,证明该方法具有较好的适用性。实验结果表明所建立的实时荧光定量PCR方法具有特异、敏感、快速、定量的优点,可用于迟缓爱德华氏菌病的快速检测。  相似文献
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根据GenBank中公布的虾肝肠胞虫(Enterocytozoon hepatopenaei) (EHP) SSU rDNA序列设计1对特异性引物,建立并优化了EHP的SYBR Green Ⅰ实时荧光定量PCR (qPCR)检测方法.结果显示,该方法在60℃的退火温度时扩增效果最好,产物的熔解曲线为1个单峰,构建的方法对8.3×101-8.3×108 copies/μ1的EHP SSU rDNA片段的检测响应具有良好的线性关系,扩增产物阈值循环数(Ct)与模板起始量的对数[log(Sq)]的关系为Ct=-3.369 log(Sq)+39.364 (R2=0.992),扩增效率为98.1%,检测灵敏度下限为8.3× 10(1) copies/μ1,在线性范围内具有良好的组内和组间重复性.对实际样品的检测表明该方法比已报道的套式PCR的检测灵敏度约高4倍.利用本方法对采集自江苏、海南和山东的3批凡纳滨对虾样品的肝胰腺组织DNA (HpDNA)中的EHP SSU rDNA进行了qPCR检测,结果显示,EHP的载量指数与对虾生长速率呈负相关关系,肝胰腺中EHP载量在103 copies/(ng HpDNA)时代表了较高的风险水平.本研究建立的qPCR方法具有特异、灵敏、快速、定量的优点,所建立的方法及检测数据可为EHP的防控提供技术参考.  相似文献
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A rapid, economical, specific, and sensitive quantitative real‐time polymerase chain reaction (qPCR) assay coupled with SYBR Green I chemistry was developed for the quantitative detection of Aeromonas salmonicida from farmed Atlantic salmon, Salmo salar, with the symptoms of furunculosis. The set of primers designed from the virulence array protein (vapA) gene was specific to A. salmonicida. Compared with the conventional PCR, qPCR had a lower detection limit of 5.6 copies of the positive plasmids. The standard curve, which showed the relationship between the copies of A. salmonicida and its quantification cycle (Cq) value, could be described as follows: log (copies of A. salmonicida) = −0.3213 Cq + 10.721. The quantitative detection of copies of A. salmonicida in different tissues of the moribund Atlantic salmon showed that A. salmonicida could be detected in all tissues; the spleen contained the largest number of A. salmonicida and then the kidney. These results suggest that the qPCR assay reported here is a specific, sensitive, and quantitative method for detecting A. salmonicida. It can be used for the routine tests of A. salmonicida in local aquaculture enterprise and for the research of infection routes of A. salmonicida to Atlantic salmon.  相似文献
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灿烂弧菌Vibrio splendidus是多数海水养殖动物的主要致病菌,对养殖业危害较大。本研究根据灿烂弧菌gyrB基因的保守序列设计特异性引物,建立了SYBR Green I实时定量PCR检测灿烂弧菌的方法。构建含gyrB基因的重组质粒作为标准品,进行SYBR Green I实时定量PCR,在Tm为62℃时,扩增产物的熔解曲线仅有一个单特异峰,扩增所得标准曲线为y=-3.338x+37.67,相关系数为0.999,扩增效率为0.99,最低能检测到20个拷贝。实验结果表明,该检测技术具有较高的特异性、敏感性和重复性,对灿烂弧菌病的快速诊断和流行病学调查有重要意义。  相似文献
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