challenge infection meaning in Chinese

攻击感染

To elucidate the antigenic drift and evolution of h9n2 subtype avian influenza viruses ( aivs ) , five isolates from the north of henan province during 1998 - 2002 were compared and analysed by cross - hemagglutinin inhibition test ( hi ) , cross - virus neutralization test ( vn ) in the chicken embryo and chicken embryo primary kidney cell ( cek ) and cross protection against challenge infection test
为了探讨h _ 9n _ 2亚型禽流感病毒的抗原性有否发生漂移，本研究从生物学角度和ha基因分子水平上对1998 ? 2002年间在河南省豫北地区分离到的5株h _ 9n _ 2亚型禽流感病毒的抗原性变化进行了比较和分析。
The target gene was then subcloned into plasmid vector and induced by iptg for its expression . after that , the recombinant protein was purified and used for the identification and characterization of its immunogenicity . the effect of the induced specific ige antibody on the hepatic granuloma formation and fibrosis after challenge infection with schistosome cercariae was evaluated
Niptg诱导表达，产物沉淀中于约45kda处显见高合蛋白表达带， westernblot分析表明，该蛋白带可被筛库血清中特异性lge抗体识别；而载体本身表达的26gst蛋白带则否。