卵裂的

BACKGROUND: Presently, the method of establishing human embryonic stem cells mainly contains blastula method, nuclear transplantation method and embryo blastomere method.

背景：目前人胚胎干细胞建系的技术路线主要有囊胚法、核移植法和胚胎单卵裂球法，但由于破坏胚胎，涉及诸多伦理问题。

The blastula formation whose embryos were from different sources was compared and the blastomere number, quality classification and the relationship between the parity of the blastomere number and the blastula formation at d 3 were studied.

比较不同来源胚胎囊胚形成情况和d3胚胎的卵裂球数、质量分级等；并利用废弃胚胎囊胚形成情况对体外受精妊娠结局进行预测。

Interestingly, a monopolar spindle was assembled in each blastomere in the second cell cycle, and disjunction of duplicated chromosomes and the cleaage was preented, leading to the chromosome set doubling.

有趣的是，在第二个细胞周期中，每一个分裂球中都组装了一个单极纺锤体，同源染色体分离和卵裂被阻止，导致染色体组加倍。

Cleavage produces a blastula a sheet of cells rounded into a sphere that in most species surrounds a cavity.

卵裂产生一个囊胚，形成的细胞壁球形排列形成一个空腔。

This marks the end of the cleavage stage of development.

这标志着卵裂发育阶段的结束。

Usually the cytoplasm in this region is incorporated into future endoderm cells .

可是在植物极也有产生小卵裂球的情况。

It transforms the zygote into a cluster of cells called morula which, seen through a microscope, resembles a mulberry.

卵裂把受精卵转换成称为桑葚胚的细胞团，它在显微镜下看起来象桑葚果。

At water temperature of 16.0-17.2 ℃, the process of embryonic development could be divided into 24 stages, which were described as follow: fertilized egg at 0 min, 2-cell stage at 75 min post fertilization; myotome forming stage at 43 h PF, and hatching-out stage at 94 h PF when the accumulative temperature reached 1616.8 ℃.h, and the average size of larvae was about 3.8 mm in body length.

梭鲈胚胎发育过程可分为24期，在水温16.0~17.2℃范围内，受精75 min开始第1次卵裂，受精后43 h开始形成器官，受精后约94 h开始出膜；刚出膜的仔鱼全长平均为3.8 mm；从受精到孵化出膜总积温为1 616.8℃。h。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的 探讨卵细胞第一极体形态与原核期受精卵形态、卵裂期胚胎质量的关系。

Inflorescence an axillary heads; flowers bisexual, petals5, white, ribbon-like,1.5 cm long; stamens5, filaments very short, anthers ovoid, with2 pollen sac opening each by2 vertical valves, connectives exserted; staminodes5, bifid.

头状花序腋生，花两性，花瓣5，白色，带状，长1.5厘米；雄蕊5，花丝极短，花药卵形，具2个各2瓣裂的花粉囊，药隔突出；退化雄蕊5，叉状分裂。

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。