胚胎

Transforming growth factor-β is a multifunctional cytokine with widespread distribution in body.Its biological effects are different according to different tissue,which includes the regulation of embryogeny,allelotaxy,tissue repair and body immune.Transforming growth factor-beta-β has been the study target of human aging.

转化生长因子-β是一类多功能细胞因子，在体内分布广泛，在不同器官的细胞中有着不同的生物学效应，其涉及到胚胎发生、器官发育、组织修复以及机体免疫等调节过程，该细胞因子已经成为衰老研究的一个靶点。

The expression level of tim gene in 25LL is markedless higher than 15DD and 20LD in the early incubation stage(7 days before), but it is obviously higher than 20LD and 15DD conditions in the late.To further invesgate the per and tim expression in different moment every day of the sensitive period(7d,8d,9d) during the process of embryogeny,the expression of tim gene was very low and the per and tim expression did not have obvious rhythmicity under 15DD condition.

进一步调查家蚕胚胎对环境敏感时期(7d-9d)per和tim基因的昼夜表达节律，在15DD条件下，tim基因表达量一直很低，tim基因和per基因的表达量都没有明显的节律性变化；而25LL和20LD条件下，两基因在一日中不同时刻的表达具有明显的节律性，表达量也较高。

It has been demonstrated that through the formation of embryoid bodies germ cells can be derived from embryonic stem cells.

当前的研究已经证实了胚胎干细胞能在体外分化出胚性生殖细胞。

Embryoid stem cells are kinds of cell groups which are self-produce and differentiated into multi-oriental cell types.

在胚胎的发生发育中，单个受精卵可以分裂发育为多细胞的组织和器官。

Objective: To determine the optimal condition for mouse embryonic stem cells culture with stirred bioreactor, and to develop a method for mass production of embryoid bodies.

目的：摸索搅拌式生物反应器培养小鼠胚胎干细胞的最佳条件，建立一种批量制备拟胚体的方法。

Embryoid bodies provide an unprecedented opportunity to study the events regulating lineage commitment, and tissue growth and maturation during embryonic development.

胚体提供了一个前所未有的机会来研究活动调节系承诺，并组织发育和成熟的胚胎发育过程中。

In the first step the hES cells were co-cultured with cytokines by formation of the day 5 embryoid bodies(5 d EBs).

在胚胎发育的不同阶段不同的造血微环境对造血发生发挥重要作用。

Methods and Results— With the use of a standard embryoid body–based differentiation protocol for ES cells, iPS cells as well as ES cells were differentiated for 24 days.

方法与结果：使用标准的拟胚体结构方案分化胚胎干细胞与ips细胞，分化24天。

Morphologically, embryonic stem cells developed from unicells into compact three-embryonic layer embryoid body and into incompact cell population.

胚胎干细胞在形态学上由单细胞发育为致密的包含3胚层结构的拟胚体，再继续分化为松散的细胞群落。

Explain how the mother's lifestyle is so vital for normal embryologic development.

解释母亲的生活方式对正常胚胎学发展至关重要。

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。