gastrula stage

The results showed that , the digestive canal initiated from the gastrocoele , which was formed by invagination at gastrula stage .

结果表明，单环刺消化道起源于原肠胚期内陷而成的原肠腔；

The results showed that water content decreased first , then increased in the gastrula stage of embryonic development , reached the highest content at the second phrase larvae stage and then began to decrease from the third phase larva stage .

结果显示，黑斑口虾蛄在胚胎和幼体的发育过程中，水的体积分数先降低，至原肠胚期开始升高，到第二相幼体期达到最高，之后又有所回落；

The results showed : At gastrula stage , the cells in front of the embryonic area gradually cleave to form optic disc rudiment .

在原肠期，胚区前端的外胚层细胞增殖形成视叶原基。

Agat transcripts first appeared in the yolk syncytial layer ( YSL ) at gastrula stage .

原肠期开始，agat开始出现在卵黄合胞体层（YSL）。

The ECs derived from the zebrafish at gastrula stage were isolated and sub-cultured with the trypsin digestion .

采用胰蛋白酶消化法从原肠期斑马鱼分离出ECs，并进行原代和继代培养。

Embryonic development period including 4 stages : gastrula stage , early trochophore stage in egg membrane , late trochophore stage in egg membrane and at the moment of hatching stage ;

胚胎发育阶段有4个时期：原肠期、担轮幼体早期、担轮幼体晚期和担轮幼体孵化瞬期。

Embryos at 4 ~ 8 cell stage showed higher survival rate and lower abnormal embryo rate than embryos at multicellular stage or early gastrula stage when radiated at the same dose and dose rate .

在相同剂量和剂量率下，处于4~8细胞期的胚胎存活率比多细胞期和囊胚早期高，而畸形率低。

When the cleavage furrow of the two cell stage was irradiated with an energy density of 623 μ J / μ m ~ 2 , most of the embryos died in the gastrula stage .

用623μJμm~2能量密度照射二细胞期卵裂沟的卵，多数只能发育至原肠胚，少数发育成为头部分化不全的蝌蚪而死亡。

But the development of the CNS is almost mormal when embryos were treated with RA after the gastrula stage , then it did not inhibit the gastrulation and consequently neural induction .

但在原肠中期以后处理的胚胎，神经系统发育基本正常，因此说明视黄酸并不抑制原肠作用和随后的神经诱导。

From fertilized eggs to newly hatched larvae , can be divided into 4 main stages ; including cleavage stage , blastula stage , gastrula stage and formation of embryo stage , total 22 embryonic development stages .

从受精卵到仔鱼出膜可分为卵裂期、囊胚期、原肠期、胚体形成期4个主要阶段，22个发育时期。

The putative PGCs with Cf-vasa expression form in gastrula stage , and are located symmetrically at both sides of the stomodeum in trochophore . These cells subsequently migrate to the posterior pole of D-shaped larva and then migrate towards abdomen .

表达Cf-vasa的原生殖细胞形成于原肠胚时期，在担轮幼虫中对称分布于口凹两侧，并随幼虫发育迁移至D型幼虫末端后，继续沿边缘向腹面迁移。

The incubation period is 66 hours from 18 to 22 ℃ . The embryonic development process can be divided into 6 stages , including fertilized egg , cell cleavage , blastula , gastrula , neural stage and organ formation , and there are thirty-one developmental phases observed noticeably .

在水温18~22℃条件下，胚胎从受精到孵化出膜历时66h，经过了胚盘形成期、卵裂期、囊胚期、原肠胚期、神经胚期、器官分化期6个主要阶段。

However , the embryos at gastrula or heart beating stage were very sensitive to UV irradiation , showing just damage effect , which was very strong even at very low amount of the UV irradiation .

而处于原肠期和心脏搏动期的胚胎对UV辐射非常敏感，而且只表现出损伤效应，既使是较低的剂量，损伤作用也很强。