研究洛那法尼(Lonafarnib,LNF)对动物源丁型肝炎病毒(Hepatitis D virus,HDV)的影响,将完善对动物源HDV的认识,为进一步探讨其潜在致病性和传播特点奠定基础。利用点突变的方法对人源HDV复制模型进行改造来模拟动物源HDV的关键结构特征...研究洛那法尼(Lonafarnib,LNF)对动物源丁型肝炎病毒(Hepatitis D virus,HDV)的影响,将完善对动物源HDV的认识,为进一步探讨其潜在致病性和传播特点奠定基础。利用点突变的方法对人源HDV复制模型进行改造来模拟动物源HDV的关键结构特征,利用转染、抗生素筛选的方法构建模拟的动物源HDV复制细胞模型,蛋白质免疫印迹法和间接免疫荧光法检测人源HDV复制模型改造后的HDV复制与蛋白表达情况,实时荧光定量PCR检测LNF对动物源HDV复制的影响。结果表明,改造后的HDV复制模型仍能在体外高效复制,可用于模拟动物源HDV的关键特征。与未处理组相比,LNF处理人源HDV复制模型后导致了HDV RNA的积累,而LNF对改造后的HDV样病毒的复制水平无显著影响。通过上述研究发现人源HDV与动物源HDV在病毒的生命周期和药物的作用效果方面均存在较大差异。展开更多
To estimate genetic variation in rhizome lotus （Nelumbo nucifera Gaertn. ssp. nucifera） germplasms in China, a total of 94 rhizome lotus germplasms collected from 18 provinces in China were assessed. The RAPD （rand...To estimate genetic variation in rhizome lotus （Nelumbo nucifera Gaertn. ssp. nucifera） germplasms in China, a total of 94 rhizome lotus germplasms collected from 18 provinces in China were assessed. The RAPD （randomly amplified polymorphic DNA） marker was employed. The selected 17 random primers detected 139 polymorphic alleles out of a total 207 （67.15%）. Nei＇s gene diversity statistics and region differentiation parameters indicated that all germplasms had a relatively high level of genetic diversity with ne = 1.3202, h = 0.1937, I= 0.2982 and the gene flow among all regions was Nrn = 5.5742. The UPGMA dendrogram clustered all 94 germplasms into two clusters： One contained eight commercial cultivars and major landraces, and the other included the wild and some special landraces from five regions, and the PCA analysis exhibited the similar result. Those germplasms from southwestern and eastern China had higher genetic diversity than those from the southern, northern and central China. Predominant proportion of genetic variation （95.61%） was found significant within rather than among （4.39%） regions, as revealed by AMOVA analysis. The data analysis also revealed that the genetic diversity of rhizome lotus germplasms among different regions is positively related to their geographic distances, though it is ambiguous to find the trend from the UPGMA dendrogram and the PCA analysis. A relatively high genetic diversity and gene flow resided in the root lotus germplasms; about 96% of the variation was found within region; accessions from southwest and eastern China have higher genetic diversity than those from the southern, northern and central China.展开更多
Let h be a polynomial in four variables with the singular Hessian Hh and the gradient ▽h and R be a nonzero relation of ▽h. Set H = ▽R（▽h）. We prove that the components of H are linearly dependent when rkHh ≤ 2...Let h be a polynomial in four variables with the singular Hessian Hh and the gradient ▽h and R be a nonzero relation of ▽h. Set H = ▽R（▽h）. We prove that the components of H are linearly dependent when rkHh ≤ 2 and give a necessary and sufficient condition for the components of H to be linearly dependent when rkHh = 3.展开更多
文摘研究洛那法尼(Lonafarnib,LNF)对动物源丁型肝炎病毒(Hepatitis D virus,HDV)的影响,将完善对动物源HDV的认识,为进一步探讨其潜在致病性和传播特点奠定基础。利用点突变的方法对人源HDV复制模型进行改造来模拟动物源HDV的关键结构特征,利用转染、抗生素筛选的方法构建模拟的动物源HDV复制细胞模型,蛋白质免疫印迹法和间接免疫荧光法检测人源HDV复制模型改造后的HDV复制与蛋白表达情况,实时荧光定量PCR检测LNF对动物源HDV复制的影响。结果表明,改造后的HDV复制模型仍能在体外高效复制,可用于模拟动物源HDV的关键特征。与未处理组相比,LNF处理人源HDV复制模型后导致了HDV RNA的积累,而LNF对改造后的HDV样病毒的复制水平无显著影响。通过上述研究发现人源HDV与动物源HDV在病毒的生命周期和药物的作用效果方面均存在较大差异。
文摘To estimate genetic variation in rhizome lotus （Nelumbo nucifera Gaertn. ssp. nucifera） germplasms in China, a total of 94 rhizome lotus germplasms collected from 18 provinces in China were assessed. The RAPD （randomly amplified polymorphic DNA） marker was employed. The selected 17 random primers detected 139 polymorphic alleles out of a total 207 （67.15%）. Nei＇s gene diversity statistics and region differentiation parameters indicated that all germplasms had a relatively high level of genetic diversity with ne = 1.3202, h = 0.1937, I= 0.2982 and the gene flow among all regions was Nrn = 5.5742. The UPGMA dendrogram clustered all 94 germplasms into two clusters： One contained eight commercial cultivars and major landraces, and the other included the wild and some special landraces from five regions, and the PCA analysis exhibited the similar result. Those germplasms from southwestern and eastern China had higher genetic diversity than those from the southern, northern and central China. Predominant proportion of genetic variation （95.61%） was found significant within rather than among （4.39%） regions, as revealed by AMOVA analysis. The data analysis also revealed that the genetic diversity of rhizome lotus germplasms among different regions is positively related to their geographic distances, though it is ambiguous to find the trend from the UPGMA dendrogram and the PCA analysis. A relatively high genetic diversity and gene flow resided in the root lotus germplasms; about 96% of the variation was found within region; accessions from southwest and eastern China have higher genetic diversity than those from the southern, northern and central China.
基金The Scientific Research Foundation (2012QD05X) of Civil Aviation University of Chinathe Fundamental Research Funds(3122014K011)for the Central Universities of China
文摘Let h be a polynomial in four variables with the singular Hessian Hh and the gradient ▽h and R be a nonzero relation of ▽h. Set H = ▽R（▽h）. We prove that the components of H are linearly dependent when rkHh ≤ 2 and give a necessary and sufficient condition for the components of H to be linearly dependent when rkHh = 3.
