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Therefore, to analyze difference of immunogenicity among NDV epizootic isolates and vaccine strains in details and to establish methods to check immune and epidemic situation,we expressed F protein of strain F_(48)E_9 and strain La Sota respectively.

为了具体分析流行毒株和疫苗毒株之间的免疫原性差异情况和建立适用于检测ND免疫和流行情况的方法，我们又分别表达了弱毒疫苗株La Sota和标准强毒株F_(48)E_9的F蛋白。

It was worth to note that the HI titer of monovalent vaccine immunized group challenged with the same type reached the peak earlier than that challenged with different type virus, whereas there was no such difference among multivalent vaccine immunized groups. It suggested that NDV immunogenicity among epizootic isolates and vaccine strains were also variable in some extent.

单价免疫组鸡对相同基因型NDV 刺激产生的回忆反应要比对具有不同基因型NDV 刺激产生的时间要早，多价灭活苗免疫组对抗原刺激产生的回忆反应基本相同，说明不同流行株在抗原性上存在一定的差异。

This established reverse genetics system provides a powerful tool for the research of the P gene in this study.1.Full-length genome analysis of Newcastle diseases virus strains belonging to genotypeⅢandⅨreveals the common origin of recent epizootic viruses.

基因Ⅲ型和Ⅳ型新城疫病毒全基因组测序及其在新城疫进化史中的重要地位分析根据EMBL/GenBank中已发表的基因Ⅲ型NDV全基因和基因Ⅸ型NDV基因片段设计一套全基因引物，将NDV全基因分为10个相互重叠的片段进行RT-PCR扩增。

From June to September in 1985, an epizootic disease occurred tn rainbow trout fingerlings in the farm of Shuoxian county, Shanxi province, The strains that isolated from the liver, kidney and spleen of the diseased rainbow trout were shown to be the cause of the disease by infection experiments.

1985年6～9月间，山西省虹鳟鱼实验场鱼种爆发了一起细菌性疾病，从病鱼的肝、脾、肾中分离到细菌，用此菌人工感染虹鳟能得到与天然发病病鱼相似的症状，并从被感染鱼的体内重新分离到这种菌，证实为该病病原菌。

The phylogenetic analysis showed that QH3,HLJ and A4 belonged to the genetype Ⅷ,Ⅸ,Ⅵ respectively. It indicated that not only NDV genetypes among epizootic strains isolated from different areas were evidently variable, but also special genetype DC which hadnt prevailed in abroad was present in China.

表明我国NDV流行毒株在各地区之间具有明显的基因型差异，而且还具有不同于国外流行的我国特有的基因型——基因Ⅸ型。

The phylogenetic analysis showed that QH3,HLJ and A4 belonged to the genetype Ⅷ,Ⅸ,Ⅵ respectively. It indicated that not only NDV genetypes among epizootic strains isolated from different areas were evidently variable, but also special genetype DC which hadn't prevailed in abroad was present in China.

表明我国NDV流行毒株在各地区之间具有明显的基因型差异，而且还具有不同于国外流行的我国特有的基因型——基因Ⅸ型。

If this is not done the bacteria will not be completely eradicated and drug- resistant strains may develop.

如果不这样做细菌不会被彻底消灭和耐药菌株有可能发展。

The results indicated that ergosterol content was correlated with ethanol tolerance and osmotolerance of saccharomyces cerevisiae strains.

结果表明，麦角甾醇与酵母的耐酒精及耐高渗能力有一定的相关性，耐性好的酵母其麦角甾醇含量较高。

The overexpression and combinatorial expression of genes involved in ergosterol biosynthesis are not only useful to construct strains with high ergosterol content, but also present a putative technical process that can be used to microbiology breeding.

上述研究不但获得了高麦角甾醇和较高生物量的酵母菌株，同时也为具有重要应用价值的微生物育种探索了可以借鉴的新方法和新技术。

Coclusion These results demonstrated that the rSpaA-N is a protective antigen of Erysipelothrix rhusiopathiae serotype 2 strains, and might be a useful vaccine candidate against swine erysipelas.

本研究结果表明rSpaA-N具有良好的免疫保护作用，可以作为猪丹毒亚单位疫苗。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。