为建立可同时检测猪流行性腹泻病毒(PEDV)和猪丁型冠状病毒(PDCoV)的双重Taq Man qRT-PCR方法,本研究根据Gen Bank中的PEDV M基因及PDCo V N基因设计了两对特异性引物和探针,构建重组质粒作为标准品,绘制标准曲线,建立其检测方法,结果显...为建立可同时检测猪流行性腹泻病毒(PEDV)和猪丁型冠状病毒(PDCoV)的双重Taq Man qRT-PCR方法,本研究根据Gen Bank中的PEDV M基因及PDCo V N基因设计了两对特异性引物和探针,构建重组质粒作为标准品,绘制标准曲线,建立其检测方法,结果显示,根据两种病毒质粒标准品构建的标准曲线的相关系数(R2)均为1,线性关系良好。该方法特异性强,与猪圆环病毒2型(PCV2)、猪圆环病毒3型(PCV3)、伪狂犬病毒(PRV)、猪繁殖与呼吸综合征病毒(PRRSV)、传染性胃肠炎病毒(TGEV)、猪博卡病毒(PBo V)及猪瘟病毒(CSFV)均无交叉反应;敏感性试验结果显示,建立的单一与双重荧光定量PCR对PEDV及PDCo V的质粒标准品检测下限均分别为4.7×10^(1)拷贝/μL和3.17×10^(1)拷贝/μL,敏感性高;对该检测方法的重复性进行验证,结果显示,该方法组内和组间的变异系数均小于3%,重复性好。利用建立的该双重Taq Man q RT-PCR检测方法分别对118份猪粪便样品进行检测,结果显示,PEDV阳性检出率为56.8%(67/118),PDCo V阳性检出率为33.1%(39/118),二者共感染率为16.1%(19/118)。本研究首次以PEDV M基因及PDCo V N基因为靶基因,建立了同时检测PEDV和PDCo V的双重Taq Man q RT-PCR,该方法具有快速、灵敏、准确、重复性高等优点,可用于这两种病毒的同时检测和快速排查。展开更多
Glaciers play an important role in the climate system. The elevation change of a glacier is an important parameter in studies of glacier dynamics. Only a few ground-based measurements of high mountain glaciers are ava...Glaciers play an important role in the climate system. The elevation change of a glacier is an important parameter in studies of glacier dynamics. Only a few ground-based measurements of high mountain glaciers are available due to their remoteness, high elevation, and complex topography. The acquisition from the German Tan DEM-X(Terra SAR-X add-on for Digital Elevation Measurement) SAR imaging configuration provides a reliable data sources for studying the elevation change of glaciers. In this study, the bistatic Tan DEM-X data that cover the Geladandong Mountain on the Tibetan Plateau were processed with SAR interferometry technique and the elevation changes of the mountain's glaciers during 2000–2014 were obtained. The results indicated that although distinct positive and negative elevation changes were found for different glacier tongues, the mean elevation change was about-0.14±0.26 m a-1. Geoscience Laser Altimeter System(GLAS) data were obtained for comparison and verification. The investigation using GLAS data demonstrated the efficacy of the proposed method in determining glacier elevation change. Thus, the presented approach is appropriate for monitoring glacier elevation change and it constitutes a valuable tool for studies of glacier dynamics.展开更多
文摘为建立可同时检测猪流行性腹泻病毒(PEDV)和猪丁型冠状病毒(PDCoV)的双重Taq Man qRT-PCR方法,本研究根据Gen Bank中的PEDV M基因及PDCo V N基因设计了两对特异性引物和探针,构建重组质粒作为标准品,绘制标准曲线,建立其检测方法,结果显示,根据两种病毒质粒标准品构建的标准曲线的相关系数(R2)均为1,线性关系良好。该方法特异性强,与猪圆环病毒2型(PCV2)、猪圆环病毒3型(PCV3)、伪狂犬病毒(PRV)、猪繁殖与呼吸综合征病毒(PRRSV)、传染性胃肠炎病毒(TGEV)、猪博卡病毒(PBo V)及猪瘟病毒(CSFV)均无交叉反应;敏感性试验结果显示,建立的单一与双重荧光定量PCR对PEDV及PDCo V的质粒标准品检测下限均分别为4.7×10^(1)拷贝/μL和3.17×10^(1)拷贝/μL,敏感性高;对该检测方法的重复性进行验证,结果显示,该方法组内和组间的变异系数均小于3%,重复性好。利用建立的该双重Taq Man q RT-PCR检测方法分别对118份猪粪便样品进行检测,结果显示,PEDV阳性检出率为56.8%(67/118),PDCo V阳性检出率为33.1%(39/118),二者共感染率为16.1%(19/118)。本研究首次以PEDV M基因及PDCo V N基因为靶基因,建立了同时检测PEDV和PDCo V的双重Taq Man q RT-PCR,该方法具有快速、灵敏、准确、重复性高等优点,可用于这两种病毒的同时检测和快速排查。
基金supported by the National Science Foundation of China (41590852, 41001264)the International Science & Technology Cooperation Program of China (2010DFB23380)+1 种基金International Partnership Program of Chinese Academy of Sciences (131C11KYSB20160061)supported by the DLR AO project (GEOL0447)
文摘Glaciers play an important role in the climate system. The elevation change of a glacier is an important parameter in studies of glacier dynamics. Only a few ground-based measurements of high mountain glaciers are available due to their remoteness, high elevation, and complex topography. The acquisition from the German Tan DEM-X(Terra SAR-X add-on for Digital Elevation Measurement) SAR imaging configuration provides a reliable data sources for studying the elevation change of glaciers. In this study, the bistatic Tan DEM-X data that cover the Geladandong Mountain on the Tibetan Plateau were processed with SAR interferometry technique and the elevation changes of the mountain's glaciers during 2000–2014 were obtained. The results indicated that although distinct positive and negative elevation changes were found for different glacier tongues, the mean elevation change was about-0.14±0.26 m a-1. Geoscience Laser Altimeter System(GLAS) data were obtained for comparison and verification. The investigation using GLAS data demonstrated the efficacy of the proposed method in determining glacier elevation change. Thus, the presented approach is appropriate for monitoring glacier elevation change and it constitutes a valuable tool for studies of glacier dynamics.