Six isolates of Newcastle disease virus were derived from south and east China regions during the disease outbreaks called "avian paramyxovirus infection of geese" or "geese paramyxovirus infection"...
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Six isolates of Newcastle disease virus were derived from south and east China regions during the disease outbreaks called "avian paramyxovirus infection of geese" or "geese paramyxovirus infection",and partial sequence analysis of hemagglutinin-neuraminidase(HN) gene was carried out to identify the genetic characteristics of these goose isolatesA 1905 nucleotide portion of HN gene of each of the 6 isolates was sequenced,the results revealed that the coding region of their HN genes are all 1716 nucleotides in length,which can encode 571 amino acid residues aloneThe coding region is followed by a noncoding sequence of 189 nucleotidesThough they diverged only 08%-37% from each other in the nucleotide sequences of coding region,they differed by 175%-179% to F48E8, a standard challenge strain of chicken originCysteine residues are well conserved throughout the amino acid sequences,while the number of the potential glycosylation sites varys from 4 to 6Residue positions Thr 48,His 54,Ser 77,Ala 266,His 340 and Lys 384 are also highly conserved in the 6 goose isolatesThe corresponding residues in other NDV strains are commonly Met 48,Ser 54,Asn 77,Ile 266,Tyr 340 and Glu 384However,the sequences of receptor-binding related regions show no difference to the 14 reference strains from domestic or
用表达绿色荧光蛋白 ( green fluorescentprotein,GFP)的重组减毒鼠伤寒沙门氏菌 X4 5 5 0 ( p YAGFP)给 BAL B/c小鼠尾静脉注射和口服 ,对小鼠脏器进行细菌计数 ,并用间接 EL ISA法测定血清中抗细菌的抗体。结果表明 ,静脉注射重组菌...
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用表达绿色荧光蛋白 ( green fluorescentprotein,GFP)的重组减毒鼠伤寒沙门氏菌 X4 5 5 0 ( p YAGFP)给 BAL B/c小鼠尾静脉注射和口服 ,对小鼠脏器进行细菌计数 ,并用间接 EL ISA法测定血清中抗细菌的抗体。结果表明 ,静脉注射重组菌的小鼠在肝脏、脾脏中重组菌数量有 2个峰值 ,总的趋势是越来越少 ,而血清中抗体效价越来越高 ,可以初步推断 ,肝脏、脾脏中的细菌数量与血清中的抗体水平呈一定的相关性 ;口服重组菌的小鼠 ,在各脏器中重组菌的数量呈现正态分布的变化趋势 ,其中派伊尔结 ( Peyer′s patches,PPs)中细菌数量与血清中的抗体水平呈一定的相关性 ,而脾脏、肝脏及肠系膜淋巴结中细菌数量与血清中的抗体滴度无关。
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