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The internal cause includes polarity variation , inbred variation , instability of hybridization and gene mutation . The external cause includes unfitting culture conditions , strain ag ing , unsuitable preservation and infection virus of asexuality propagation .

内因主要包括极性发生变异，自交产生的变异，杂交种性不稳定和基因突变；外因主要包括培养条件不适宜，菌种老化，菌种保藏不当和菌株无性繁殖体感染病毒。

In 2004, a Russian scientist working on an Ebola vaccine died after pricking her hand with a syringe, while in April 2005, a pandemic strain of Asian flu was released by a laboratory in America after it was accidentally put into test kits sent to scientists around the world.

"实验室事故的发生比公众所知道的要频繁，来自监控生物制剂使用的非"赢利机构"阳光计划"的埃德·哈蒙德说，这些事故并不像英国的这起这样惊人，不过我觉得，的确存在一种否认问题严重性的现象。

This strain was deposited in China General Microbiogical Culture Collection Center, named Bacillus subtilis NX-2 with the accession number of CGMCC No. 0833. Assimilability to carbon source by NX-2 was unique.

本论文主要工作如下：以L-谷氨酸分离培养基为特定的"筛子"，通过大量的筛选和工作，获得了一株高产γ-PGA的菌株枯草芽孢杆菌N X-2。

During the previous analysis of asphalt pavement structure with cracks, the stress intensity factors were usually calculated approximatively using plane strain model for some limitation. However, the assumptive load of this model is not coincident to the practical load.

在以往分析含裂缝的沥青路面结构时，由于条件的限制，通常是假设沥青路面结构近似为一平面应变模型，但是这种模型所假设的荷载与实际作用的荷载有较大的区别。

So the results made it clear that this phytoplasma strain is one of the members of Aster yellows phytoplasma group (16SrI-B group).

基本确定了这两种植原体株系属于翠菊黄化组B亚组(16SrI-B，rp-B)。

Coli . The clones were verified by restriction enzyme digestion and PCR. Sequence and homology analyses showed that this phytoplasma strain shares high homology (99.0%) with the phytoplasma of Aster Yellows that belongs to 16SrI group.

通过酶切、PCR鉴定，对筛选得到的重组阳性克隆进行核酸序列测定及同源性比较分析，结果表明其与植原体16SrⅠ组中的西方翠菊黄化植原体同源率为99%。

But it is obviously under 97.0% with other groups. With further comparing the rps3 gene of ribosomal protein gene for the CWB-YN strain,the results show that these strains shared highest homology (98.1% and 100%)with Aster yellows and Periwinkle yellows.

进一步比较CWB-YN株系核糖体蛋白基因rps3基因编码的氨基酸序列同源性，结果与16S rI–B亚组的翠菊黄化病植原体(Aster yellows，AY)和长春花黄化病植原体(Periwinkle yellows，PY)的同源性最高，分别达98.1%和100%。

In the term of unloading and opposite side loading, let the stress-strain curve have the same form of skeleton curve, the curve uses the last unloading point as its starting point, and uses soil's ultimate stress level as its asymptote. Then the hysteretic curve is constructed.

在卸载和反向加载时，采用与骨架曲线相同的函数形式，并以前一次卸载开始点作为起点，以土体的极限应力水平作为渐近线，构造出土体动力本构模型的滞回曲线。

The first chapter gives the summary of basic theories of EOS for solids, including often-used thermodynamic theories and phenomenological expressions during the study progress of EOS along with the finite strain theory. Furthermore, from the view of solid-state theory the general expression of EOS of solids P =Pc+Pn is given, and the microcosmic mechanism of compression for solids, i.e., the interactive potential energy between atomics, is also analyzed, subsequently several different forms of cold energies and pressures are derived.

第一章，给出了物态方程的基本理论概要，总结了EOS研究中最常用的热力学理论和唯象关系式以及有限应变理论，并从固体理论角度给出了固体物态方程的一般形式P =Pc+Pn，分析了固体压缩的微观机理——原子间相互作用势，由此导出了几种不同形式的冷能和冷压。

Staphylococcus aureus Staphylococcus aureus with inhibition of 14 species (of the total strain of 87%).

对金黄色葡萄球菌金黄色葡萄球菌具有抑制作用的有14种(占总菌株的87%)。

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。