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The main purpose of this dissertation is to study the problems of symmetries and conserved quantities of controllable nonholonomic systems and mechanico-electrical dynamical systems, based on the invariance of the Hamilton action under the infinitesimal Lie group transformation.

本文基于Hamilton作用量在无限小Lie群变换下的不变性，研究可控非完整系统与机电动力系统的对称性和守恒量问题。

Discrete mechanics,dynamical equation,infinitesimal transformation group,symmetry,conserved quantity

中文关键词离散力学，动力学方程，无限小变换群，对称性，守恒量

Therefore, in this research we attempt to use the mean value and a linear interplant to modify the threshold. By using this method, many meaningful results as well as the absolute threshold are conserved.

有鉴於此，本研究尝试利用算数平均数的原理并配合线性内插公式订定门槛値，这个方法不但具有相对门槛値的意义且节省电脑运算时间，同时也具备绝对门槛値之意义。

The cells were passaged no more than 5 generations,and the cell freezing density is about 3×106 cell/ml, sample numbers of each kind are between 30 and 60, conserved numbers are 150-180 ampules,biological characters of fibroblast were analysed according to the request of constructing cell line. The results were as follows: 1 Cultured cells'morpha is typical fibroblast,which is fusiformate or unregular triangle, cells is radiant,flaming or rotative during growing .Qingyuan flesh chicken's cytoplasmic tubercle is much more and shorter in contrast with Zang chicken and Langshan chicken,that can be regarded as different character from others.

细胞冻存代数在5 代以内，冻存密度为3×106个细胞/ml，每个品种的样本含量在30～60 个之间，保存管数达150～180 支，根据建系要求，对成纤维细胞的生物学性状进行分析，所得结果如下： 1 培养细胞形态为典型的成纤维状，为梭形或不规则三角形，细胞在生长时呈放射状、火焰状或旋涡状走形，清远麻鸡的细胞形态与藏鸡和狼山鸡相比，胞质向外伸出的突起较多，且较短。

The splicing reaction involves two transesterification steps which ligate the exons together and release the intron as a branched lariat structure containing a 2'5' bond with a conserved A residue in the branchpoint sequence. The splicing reactions require snRNPs and accessory proteins that assemble into a splicesome at the intron to be removed.

剪接反应包括两步转酯反应：外显子被连接在一起和内含子以分支的套索结构被释放，此结构含有一个与分支点序列中的保守A残基形成的2'5'键。

Is grouped as a subspecies of Chelonia mydas in the world, but only 2, the Parlama (Lepidochely livacea or Olive Ripley) and the Baule (Dermochelys coriacea or Leatherback), are being conserved at this location.

算作绿海龟的一个亚种就是7个种群），但是在这个中心只生活着两种：太平洋丽龟（Lepidochely livacea / Olive Ripley）和棱皮龟（Dermochelys coriacea /Leatherback）（我想你可以把拉丁文略去）。

Locksley believes that AMCase, comparable to the chitinolytic enzyme found in marine and soil bacteria—and likely conserved in human evolution—attenuates the chitin-induced innate immune response by degrading the chitin.

洛克斯利相信AMCase比得上在海洋和土壤细菌中发现的甲壳素消化酶－并且可能在人类进化中保存下来了－通过降解甲壳素减弱了甲壳素诱导的先天性免疫反应。

CAAT box" and "TATA box, potential regulatory motifs from transcription, and conserved cis-acting regulator elements were discovered within LTRs in the great number of sequences using plantCARE sortware.6 The insertional polymorphism of LTR-10 element within the genome of 8 wild species and 28 cultivars of Mallus Mill. was studied by sequence-specific amplification polymorphism.

分析获得的Tyl-copia类逆转座子的LTRs，其中含有启动子的结构特征"CAAT box"和"TATA box"及受不同胁迫条件作用的调控元件。6、基于苹果Tyl-copia类逆转座子LTR-10的SSAP技术在苹果属8个野生种和28个栽培品种中表现出了丰富的遗传多态性，多态性片段比例为88.2％。

Macaw 2.05 and DNAMAN package were employed to analyze the conserved sequences and secondary structure of the aptamers, respectively.

并用Macaw 2.05和DNAMAN软件对每个适体的保守序列和二级结构进行分析。

The mass is not a conserved quantity.Accordingto the mass-energy relation,the mass does be the static energy.

物理工作者对质量有不同的理解，物理书刊对质量有不同的阐述。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。