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Methods A strain of Propionibacterium acnes from rumen fluid of health cow with permanent rumen fistula under sterile condition was isolated by segregation procedure of anaerobic bacterium and specific medium SLB, and identified by extraction of the genome DNA of isolation bacterium, clone of the 16S rRNA gene, and sequencing of the strain.

无菌采取装有瘤胃瘘奶牛的瘤胃液，按照厌氧菌分离步骤，通过丙酸生成菌株的特异性培养基SLB进行筛选，提取分离菌的基因组DNA，克隆其16S rRNA基因，进行序列测定，分离出一株痤疮丙酸杆菌。

Twenty-eight prototrophic revertants of the tryptophan auxotrophs were obtained through spotaneous back mutation from colonies grown on synthetic medium plates or nodules of plants. Most of the revertants have resumed the nodulation abilities and enhanced nitrogen fixation activities as evidenced by darker green color, higher dry weight and more nitrogen contents in shoot than those of the wild type strain 8-1-4A did in pot experiments. However, noodulation abilities decreased to some extent and no significant differences were found in the mass of nodules compared with the parent strain.

通过自发回复突变，从培养平板和根瘤中分离到28个色氨酸原养回复突变型菌株，对其中25株进行植物盆栽试验证明其中24株菌的结瘤功能得到了恢复，而且固氮酶活性普遍比出发菌有所提高，其中41％达到极显著水平，18％达到显著水平，植株地上部分干重及含氮量也有不同程度的提高，唯有根瘤数比出发菌有所降低，其中23％降低达极显著水平，11％降低达显著水平。

The results showed that:(1) at low temperature, in the 752 eggs of the SS strain initially inoculated 639 of them hatched and 15 of them developed to the pupal stage, while in the 823 eggs of the RR strain initially inoculated only 470 hatched and 1 of them developed to the pupal stage.

2在适温下，虽然SS与RR品系之间在一些特性上存在显著差异，但总的说来差异不大，经生命生殖力表综合分析，SS和RR品系所表现的内禀增长率分别为0.2138／？

In order to fully refect the geo-tech basic mechanics behaviors and to rationally explain the strain localization, this paper establishes the theory framework of gradient-dependent plastic model based on the theory framework of gradient-dependent plastic mechanics and in considering the plastic strain's gradient-dependence in double yield function, offers a kind of possible concrete pattern of the generalized plas...

为了较全面地反映岩土的基本力学性质，同时合理解释应变局部化现象，本文基于广义塑性力学的理论框架，在双重屈服函数中考虑了塑性应变的梯度依赖，建立了广义塑性梯度模型的理论框架，并给出了广义塑性梯度模型的一种可能的具体形式，分析了该模型的各个模型参数，尤其是其中的&局部化参数&的物理意义和可能对其产生影响的因素。

The model could also explain the changing regularity of stress, the cause of generation of residual stress during drying and the relievable effect of viscoelastic strain and mechano-sorptive strain on drying stress.

模型验证实验表明，本文提出的干燥应力模型可以准确描述木材干燥应力应变变化规律；但此干燥应力模型不能计算和解释调湿处理过程中的干燥应力。

In the extensional rheometric tests, the occurrence of phenomena of "strain hardening1relied on the structure of linear long chains, and mPE didn"t show the behavior of "strain hardening", which implied that the melt strength of mPE was poor.

通过研究发现，在n1PE中混入少量LDPE，不仅能够显著降低n1PE的熔体粘度，提高其熔体粘度对剪切速率的依赖性，而且还可以有效地提高mPE的熔体强度，使mPE熔体在拉伸流动中出现显著的&应变硬化&现象。

During the non-isothermal crystallization, compared with common PE, the cooling rate had less impact on the crystallization rate of mPE. Second, the sensitivity of the melt viscosity of mPE to the shear rate was poor, and the introduction of long chain branches onto the molecular structure of mPE could improve the dependence of their melt viscosity on both shear rate and temperature. In the extensional rheometric tests, the occurrence of phenomena of'strain hardening' relied on the structure of linear long chains, and mPE didn't show the behavior of'strain hardening', which implied that the melt strength ofmPE was poor.

其中通过共聚方法在mPE分子中引入非线性长支链结构，对提高mPE熔体粘度对温度的依赖性作用较为明显，而对提高mPE熔体粘度对剪切速率的依赖性以及对提高mPE熔体强度作用较弱；采用共混方法在mPE体系中引入线性长支链结构，则对提高mPE熔体粘度对剪切速率的依赖性以及提高mPE的熔体强度的作用较为明显，而对于提高mPE熔体粘度对温度的依赖性作用相对较弱。

Under triaxial compressive conditions, with an increase of loading, the propagation and sliding of microcracks in rocklike materials become increasingly intense and lead to a serial of consequences, such as nonlinear stress-strain relationships, deterioration of elastic modulus, anisotropic deformation, volumetric dilatancy and irreversible plastic strain, etc..

三维压缩条件下，随着载荷的逐渐增加，岩石类材料内部微裂纹的传播与错动不断加剧，最终导致非线性应力－应变关系、弹性模量的减小、变形的各向异性、体积膨胀以及不可逆塑性变形等结果。

With routine method, from having elected contents higher one RNA bacterial strain among several saccharomycetes, beer yeast, and the method with Shan factor experiment have studied an experiment being bacterial strain's turn to produce more proper RNA culture medium made up of , optimum the pH value fermenting and the best fermentation time.

本实验用常规方法从数株酵母菌中选出了一株RNA含量较高的菌株——啤酒酵母，并用单因素实验的方法研究了该菌株产RNA较适宜的培养基组成、最佳发酵pH值和最佳发酵时间。

Methods The H gene was amplified and cloned from the passages of MeV23,MeV26,MeV27, MeV29,MeV32 and MeV37 of the attenuated strain of MeV vaccine strain S191 by reverse tran- scription potymerase chain reaction.

方法利用逆转录—聚合酶链反应方法扩增S191减毒株MeV23、MeV26、MeV27、MeV29、MeV32和MeV37代H基因，测序后与GenBank上U03663的序列进行比对分析。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。