胚胎发育

Our survey seriously undermines the credibility of Haeckel's drawings, which depicts not a conserved stage for vertebrates, but a stylised amniote embryo.

我们的研究严重削弱了海克尔图形的可信性，海克尔图形与其说是显示脊椎动物胚胎发育过程中一个相似时期，不如说是按固定程式设计的胚胎。

Pregnancy is a complicated process, it contains the early implantation of blastocyst and the embryonic development.

妊娠是一个复杂的过程，包括早期的胚胎着床及其之后的胚胎发育。

Embryology The study of the development of embryos, usually from fertilization.

胚胎学：是研究胚胎发育的学科，通常从受精开始。

In zebrafish, the expression of fez becomes detectable at the anterior edge of the presumptive neuroectoderm by 70% epiboly.

本文用整体原位杂交的方法揭示了在斑马鱼胚胎发育过程中，Fez基因的表达最早出现在原肠期胚胎头部未来的神经外胚层细胞中，此时胚盘仅下包约70％。

Temporal and spatial expression pattern of gibel carp pou2 during embryogenesis was investigated by RT-PCR and whole-mount in situ hybridization. RT-PCR result indicates that there is maternal transcript of gibel carp pou2 in early embryos and the zygotic pou2 transcript is abundantly expressed from blastula stage. Large amount of pou2 transcript is detected at both 50% and 90% epiboly stages. At 100% epiboly stage, however, the pou2 transcript reduces rapidly and disappears at the later embryogenesis. Whole-mount in situ hybridization shows that the maternal transcript ubiquitously exists in all blastomere cells.

我们用RT-PCR和整体原位杂交的方法研究了银鲫pou2基因在胚胎发育过程中的时空表达图式RT-PCR结果显示，银鲫pou2基因有母源转录本，其合子基因在高囊胚期强烈表达，在50%下包期和90%下包期也有高量的转录本，但在100%下包期表达量急剧降低，至体节期时已经完全检测不到其转录本胚胎整体原位杂交结果显示其母源转录本在所有的胚盘细胞中。

With the development of embryo, the expression of Rb have a darker colour in the epidermic cell of kidney. The cell proliferation increased greatly in the 13th day. The possible function of Rb might be correlated to the developmental process of middle embryo kidney.

据估计，与哺乳动物胚胎发育有关的基因有上万个，但已知其结构和功能的发育基因为数很少，涉及发育和基因表达的时空调控问题仍然不清楚。

Leptin receptors have been identified in neuropeptideY, Agouti-related peptide, proopiomelanocortin cocaine and amphetamine regulated transcript containing neurons of the ventromedial and ventrolateral arcuate nucleus, respectively, and in melanin-concentrating hormone and hypocretin/orexin containing neurons of the lateral hypothalamus, suggesting that the above-mentioned messengers are mediators of leptin's action in the hypothalamus.

越来越多的证据表明Leptin是调节动物体内能量代谢的极其重要的上游调控因子，而且Leptin对动物的青春期发育，生殖器官发育和繁殖功能、妊娠、胚胎发育以及造血系统都有调节功能，是动物体内早期表达的重要功能基因。

Thus, he concluded,"ontogeny recapitulates phylogeny", which means the development of the individual embryo repeats its alleged evolutionary history.

他下结论称&个体发育重演系统发育&。也就是说，个人的胚胎发育中必经过人类的进化历史。

Cell wall-related protein genes,adenine and amino acid metabolism-related genes and CKⅡgenes were behaved high expression level during the development and mature of somatic embryos.The high expression level of the post-translation modification genes,such as SERK gene,was considered as a sign that proteins interacted complexly.It was proved that the development and maturity of somatic embryos was complex as the start-up and morphogenesis of somatic embryos.

体细胞胚胎发育与成熟要求较高水平的细胞壁相关蛋白基因、腺嘌呤与氨基酸代谢相关基因与CKⅡ基因；以SERK为代表的翻译后修饰基因在体细胞胚发育阶段的高表达被认为是复杂的蛋白质相互作用的标志，证明了体细胞胚的发育和成熟与起始发生和形态建成一样是相当复杂的。

In conclusions,(1) The pronuclear formation was asynchronous after ICSI in buffalo, the female pronuclear formed 3 hours earlier than male pronuclei;(2) After ICSI and activation, Culture of oocytes in 1.9mmol/L 6-DMAP for 3 hours can improve their subsequent embryonic development;(3) Treatment of sperm with 5mmol/L DTT can promote sperm decondensation;(4) Dead sperms can be used for ICSI in buffaloes;(5) Treatment of sperm with GSH can improve the efficiency of ICSI in buffaloes.

以上结果表明：(1)水牛精子胞质内显微受精的雌、雄原核发育不同步，雌原核比雄原核早3h形成；(2)水牛卵母细胞ICSI和激活后用1.9mmol／L 6-DMAP培养处理3h能提高其胚胎发育率；(3)DTT预处理水牛精子能提高其ICSI后的精子解聚率；(4)死精子能用于水牛卵母细胞的ICSI；(5)GSH预处理水牛精子有助于提高其ICSI后的囊胚发育率。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失