着丝点

It is difficult to find the place of centromere on chromosome precisely. So centromeric index can\'t get an accurate value.

但是由于染色体经Giemasa染色后，着丝点变得不明显了，再加上图像预处理等的影响，着丝点很难准确确定，着丝率的计算也就不会准确。

Centromeres could be identified easily on the bivalents at diplotene, so it was convenient to analyse the karyotype.

结果表明，日本沼虾染色体数n=52，2n=104，据双线期二价体的相对长度、着丝点位置以及形态诸方面的特点分析了核型，共分为A，B，C，D4个染色体组，核型组成是N=37M+4ST+11T；初级精母细胞减数分裂前期I可分为细线期/偶线期、粗线期、双线期和终变期5个时期，双线期的二价体存在弥散阶段，核仁明显，且双线期二价体着丝点清晰，给核型分析带来了方便。

The mature kinetochore organizes to form a complex structure that appears as a trilaminar disk, with each layer comprised of distinct protein compositions ensuring different roles in kinetochore function.

成熟的着丝点形成三层盘状的复杂结构，每一层由不同的蛋白成分组成，以确保在着丝点功能中作用。

The centromere contains the kinetochore, a structure involved in the attachment of the chromosomes to the spindle during nuclear division.

着丝点上包含了着丝粒，着丝粒确保细胞在分裂中染色体与纺锤体的整合，发生有序的染色体分离。

Three kinds of embryos' chromosome, including goat fertilization embryo, goat-goat cloned embryo and goat-rabbit cloned embryo were analyzed, The results showed that all of them have 60 chromosomes with same character, all were telocentric chromosome, besides the X-chromosome is the second larger telocentric chromosome.

经对超排获得的山羊受精胚、山羊同种克隆胚和羊-兔异种克隆胚的囊胚期胚胎染色体分析表明，三种来源的胚胎其染色体数目均为60条，且所有常染色体均为端部着丝点染色体，X染色体为第二大的端部着丝点染色体，说明山羊同种克隆胚和山羊-兔异种克隆胚均为山羊的核型，是供体细胞核在不同胞质中的重新编程的结果。4。

All 29 pairs of autosomes were acrocentric chromosomes;X chromosome was the second largest acrocentric chromosome and Y was the smallest and the only one metacentric chromosome in all chromosomes.

所有常染色体均为端部着丝点染色体；X染色体为第二大的端部着丝点染色体，Y染色体为最小的且是唯一的中部着丝点染色体。

The chromosomes are composed of metacentric and submetacentric chromosomes, and their karyotypes are rather symmetrical although with evident difference.

结果表明：所有供试材料的染色体数目均为2n=24，核型类型均为&2A&型；染色体主要由中部着丝点和近中部着丝点染色体组成，属较对称核型。

The analysis of these data shows that in the process of evolution the X chromosomes are as conservative as those in other mammals and the intraspecific and interspecific changes of autosomes follow such a rule:the increase of one chromosome in 2n number is always accompanied by the increase of two acrocentrics and the decrease of one metacentric or submetacentric,and vice versa.

对这些材料所进行的分析表明，鹿属动物在进化过程中，X染色体是很保守的，而常染色体的变化，无论是种间还是种内，全是2n数每增加1条，中部或亚中部着丝点染色体数就减少1条，而端着丝点染色体数就增加2条，反之亦然。

Referring to the palaeontological data and the geographical distribution of existing species,the authors come to the conclusion that the main mechanism of chromosome evolution of Cervus is the Robertsonian fission,a metacentric or submetacentric fission in the centric region into two acrocentrics.

结合对鹿属古生物学资料和现代各个种的地理分布的分析，作者认为，鹿属染色体进化的主要机制是罗伯逊断裂，即一条中部着丝点染色体在着丝点部位断裂成为两条端着丝点染色体。

Studies showed that the chromosomes of barley H2 from No.1 to No.6 are all the central centric chromosomes but the No.7 is the submedian centric chromosome.

研究表明，栽培大麦（H2）的第1至第6对染色体为中部着丝点染色体，第7对染色体为亚中部着丝点染色体。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。