胚胎

Such as pollination and fertilization, endosperm development and embryogeny, development of pericarp and testa have been investigated with the light microscope.

应用光学显微镜对女贞的传粉和受精、胚乳和胚胎的发育、果皮和种皮的发育等胚胎学特征进行了研究，对木犀科六属的胚胎学特征进行了比较。

Embryological observations on Crawfurdia delavayi, Tripterospermum cordatum, T. chinense, Gentiana striata and Pterygocalyx yolubilis show that the group under study is greatly diverse in differentiation and development of anther wall, type of ovule and placentae, synergid and antipodal cell in embryo sac, testa and embryogeny etc. The embryological characters are different among Crawfurdia, Tripterospermum and Gentiana Sect.

胚胎学 本文对披针叶蔓龙胆C.delavayi、双蝴蝶T.chinense、峨眉双蝴蝶T.cordatum、条纹龙胆G.striata和翼萼蔓P.voiubilis作了较详细的胚胎学研究，这些类群在花药壁的分化和形成、胚珠和胎座类型、卵器中的助细胞和反足细胞、种皮以及胚发育等特征上存在差异，并且在胚胎学特征上各自拥有原始和进化的性状。

Totipotent cells have the capacity to specialize into extraembryonic membra nes and tissues, the embryo, and all postembryonic tissues and organs.

全能细胞具有分化为特定的胚胎外膜和组织、胚胎以及所有胚胎后组织和器官的能力。

However, the secondary embryos within extraembryonic membrane can not be released.

初级胚胎可以在胚外膜内进行分裂生成二级胚胎细胞，但二级胚胎不能被释放出胚外膜。

It is not easily to gain poultry unicell fertilized egg and earlier embryo for the peculiarities of embryonic development.

家禽的胚胎发育与哺乳动物有着很大的不同，由于胚胎发育的特殊性，使得家禽不易获得单细胞受精卵和早期胚胎。

Haeckel's early version of this hypothesis has since been rejected, and the hypothesis amended as the embryo's development mirroring embryos of its evolutionary ancestors.

海克尔这一假说的早期版本（即胚胎反映出成年的进化祖先）以前已经被否决，因而这一假说修正为：胚胎的发育反映了它的进化祖先的胚胎。

The result of WISH showed that the trascription of hira gene distributed widely in the early stages of embryos development and centralized to head, heart and the end of tail. Hira gene might affect the development of brain and heart. The expression characterization of colored crucian carp Cahira gene in different tissues and different stages of embryogenesis were also investigated by RT-PCR.

胚胎原位杂交显示，Hira基因的转录本在银鲫胚胎早期广泛分布，而在胚胎后期主要集中于头部、心脏及尾芽尖部，说明也对其脑部和心脏的发育有影响。

Because current federal law already forbids the use of federal funds to create embryos (the earliest stage of human offspring ago birth) for research or to 清楚ingly endanger an embryo's life, NBAC will remain silent on embryo research.

因该现今的联邦国家律法已经禁止应用联邦基金克隆胚胎(人类后裔在出生前的最早阶段)用于研究或者有意地威胁胚胎的生命，NBAC在胚胎研究上将保持沉默。

Because current federal law aleasysty tobids the use of federal funds to create embryos (the earliest stage of people offsummer ago birth) to research or to 清楚ingly endanger an embryo's life, NBAC be to remain silent on embryo research.

因该现今的联邦国家律法已经禁止实际运用联邦基金克隆胚胎(人类后裔在出生前的最早阶段)用于研究或者有意地威胁胚胎的生命，NBAC在胚胎研究上将保持沉默。

Sheep embryo with high-purity,high-quality and high security features to extract the cells from the completion of the injection can be divided into three phases:-Using the most advanced chemical and biological equipment from sheep embryos to extract the liver activity of the protein and remove impurities,heat-sensitive eggs White matter and may result in allergic reactions of various types of risk factors-The adoption of advanced technology to extract the cells separated,thus the effectiveness of different cells,such as chest Gland cells,placental cells,liver cells and so on dozens of different types of-Using the most advanced technology to maintain the freeze-dried cells of live sheep-embryo for the first time the use of only afew hours to keep The cell activity,and now,with the continuous development of science and technology,after the extract ion of the cells have been able to keep to five years.

羊胚胎素具有高纯度、高品质和高安全性的特点，从细胞的提取到针剂的完成可分为三个阶段：-运用最先进的生化磁粉探伤仪，从小羊胚胎的肝脏中提取活性蛋白质，并去除杂质、热敏感蛋白质及可能导致过敏反应的各类危险因子-通过先进的技术对提取的活性细胞进行分离，从而得到具有不同功效的活性细胞，如胸腺细胞、胎盘细胞、肝脏细胞等几十种不同类型-采用目前最先进的冻干技术来保持细胞鲜活性，羊胚胎素在最初使用时只能保持几小时的细胞活性，而如今，随着科学技术的不断发展，提取后的细胞活性已经可以保持到5年。

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。