多倍体的

Recent studies indicate that extensive genetic and epigenetic changes often occur at the early stage of allopolyploid\'s genome formation,these changes have played a significant role in stabilization of newly formed genome of species.

研究表明，异源多倍体在形成的早期会出现广泛的基因组遗传和表观遗传变化，这些变化直接关系到物种的形成和稳定。

We established the technical system to obtain the EST library of plant specific chromosome,which is important to gain the ESTs and genes located on specific chromosome and provide a new tools for complicated allopolyploid genome research.

本项目获得了建立植物特定染色体EST文库的技术体系，它对分离特定染色体的EST及克隆新基因有重要参考价值，也为异源多倍体植物基因组研究提供了新的技术手段。

F〓 of transgenic allotetraploid fish containing"all-fish"transgene——pCAgcGHc was obtained respectively by inbreeding and gynogenesis. Positive rate of pCAgcGHc detected by PCR was 90％ in F〓 of transgenic allotetraploid fish produced by inbreeding, while most F〓 of transgenic allotetraploid fish produced by gynogenesis showed diploidy measured by flow cytometer. The results above imply that developing the pure line of transgenic allotetraploid fish through inbreeding is feasible, but the operation should be modified if gynogenesis is introduced.

采用近交和雌核发育方法培育出转pCAgcGHc基因异源四倍体鲫鲤F〓代，通过PCR检测，外源基因pCAgcGHc在近交转pCAgcGHc基因异源四倍体鲫鲤F〓中的整合率为90％，而流式细胞技术检测雌核发育转pCAgcGHc基因异源四倍体鲫鲤F〓的倍性多为二倍体，说明通过近交筛选转基因异源四倍体鲫鲤纯系的方法是可行的，但是通过雌核发育来筛选转基因异源四倍体鲫鲤纯系还要就方法上进一步的改进。

VCM increased the HRPE cells' proportion of phase S (6％～13％)and heteroploid was found in VCM with 250 and 500 mL/L vitreous.

VCM促使更多的HRPE细胞进入了DNA合成期（S期，6％～13％），含250与500mL/L玻璃体体积的VCM使HRPE细胞出现了异倍体的改变。

In summary, our results suggest that ANE increases micronuclei frequency, induces cell cycle arrest at G2/M phase, causes cytokinesis failure and accumulates hyperploid cells. The events are possibly associated with ROS production, actin filament disorganization and centrosome aberration.

故从本实验的结果，我们认为槟榔子萃取物会增加微核频，诱导细胞周期停滞於G2/M phase，造成细胞质分缺损与多倍体细胞的增多；而这些现象可能与活性氧的生成，actin filament 的常与中心体的变有关。

This is a sound principle, though there may be rare exceptions: polyploidy in plants is common, and the symbiosis of micro-organisms that formed the eukaryota is a more exotic example.

这是一个合理的原则，但也可能有些罕见的例外：植物出现多倍体很常见，但微生物共生形成真核生物是一个比较奇特的例子。

This may be due to the characteristics of soybean genome,an ancient tetraploid.

这些基因位于10条不同染色体上，FT类基因具有成对排列于同一条染色体的短的区段的倾向，TFL1和CEN的4个不同拷贝均位于不同的染色体上。7对基因之间同源性高于90%，而且多位于不同染色体上，可能与大豆古四倍体的特性有关。4。

Some species of sturgeons are polypolids. The hybridization is common even between genera Acipenser and Huso. The parents of different species with the same chromosome numbers will produce reproductive offsprings, and thus, genetic introgression among species would easily happen in the nature conditions.

鲟具有多倍体特徵，其中鲟属及鳇属杂交的情形非常普遍，染色体倍数相同的亲代杂交产生的子代具有繁殖力，因此在自然情况下或人为移殖时很容易造成基因渗入现象。

The zymogramatic variations of esterase isoenzyme and superoxide dismutase isoenzyme of 20 sample materials, including 5 species, 2 varieties, 1 multiploid of Isatis L. and 1 outgroup species, Coronopus didymus J. E. Smith, were analyzed with technique of polyacrylamide gel electrophoresis.

采用聚丙烯酰胺凝胶电泳，比较了菘蓝属5种2变种1多倍体品种及1外类群种共计20个样本的酯酶同工酶和超氧化物歧化酶同工酶的酶谱差异，并运用数量分类学的原理和方法对酶谱数据进行了聚类分析。

Analysis of mitochondrial DNA composition of the panda-rabit cloned embryos found that mitochondria from both panda somatic cells and rabbit ooplasm co-existed in early blastocyst, but mitochondria from rabbit ooplasm decreased and those from panda donor cells dominated in early fetuses after implantation.

结果显示，应用卵裂球电融合方法可以制作一系列的多倍体胚胎；小鼠囊胚的形成与胚胎中的细胞数目无直接关系，卵裂球的电融合和染色体数目的增加不会改变胚胎的发育进程；而胚胎细胞中的核／质比可能是控制胚胎囊胚化的一个重要因素。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐