在椭形胚期，宿存助细胞核内的染色质及核仁消失，有细胞质侵入核内。
At ellipsoidal embryo stage, the chromatin and nucleoli disappear and some cytoplasm enters the nucleus.
珠心细胞只有两层，细胞核大，胞质丰富，内含贮藏物质，至心形胚期逐渐解体。
There were only two layers of nucellus which had abundant cytoplasm and reserved substance, and were consumed at the stage of late heart-shaped embryo.
合成后的新细胞自动按照植入DNA序列“重新编程”，直到胚胎进入囊胚期，即由50至100个细胞组成的一个中空的球形幼胚。
The egg automatically 'reprogrammed' its DNA until it reached a stage of the embryo known as a blastocyst — a hollow ball of 50 to 100 cells.
极早熟桃品种“春蕾”果实硬熟期的幼胚在胚珠离体培养条件下维持胚性生长。
The young embryo of super-early maturing peach variety 'Chunlei 'at fruit hard-ripe stage maintain embryonic growth under the conditions of in vitro culture of ovule.
为了研究UVB对两栖类动物早期胚胎发育的影响，以中华大蟾蜍为研究对象，用UVB分别以不同强度和不同时间照射其二细胞期胚胎，观察记录胚胎的发育过程、统计死亡率并在形态学上对UVB照射诱导的畸胚进行分析。
To study the effects of UVB on development of early stage embryos of amphibian, two-cell stage embryos of Bufo bufo gargarizans Cantor were irradiated by UVB with various intensity and time.
研究人员用快中子照射在胚泡期和体节形成开始之间的小鼠胚胎。
The researchers used fast neutrons to irradiate mouse embryos between the blastocyst stage and the beginning of somite formation.
将646枚2 ~4细胞期重构胚移植到38只同期化及非同期化的受体后无幼仔出生。
When 646 reconstructive embryos in 2-4 cells were transferred into 38 recipients under synchronous and asynchronous, no child was born.
去核时卵母细胞质剩得过少可导致移核胚过早（6-细胞期）发生致密化或形成内细胞团细胞数目较少的小囊胚；
Too much reduction of the cytoplasmic mass at enucleationled to premature compaction of the nuclear transplant embryos at 6-cell stage or the formation of small blastocysts with few ICM cells;
用显微解剖术和扫描电镜方法观察第11～21期鸡胚鳃器官的形态结构．鸡胚鳃器官由4对鳃弓、鳃沟、鳃膜和咽囊组成。
The morphogenesis of the branchial apparatus was examined by scanning electron microscopy in chick embryos from stages 11 to 21.
酯酶同工酶则以子叶分化期胚为最多，成熟胚为最少。
The esterase isoenzyme bands were the most in cotyledon differentiatingembryoid, but the least in mature embryoid.
主要结果如下：1、起初诱导的胚性愈伤组织及处于球形期的体胚，再生能力强于其它发育时期的体胚。
The main results were described as follows: 1 Initial inducing embryogenic callus and globular embryos had super regeneration capacity than other stage embryos.
这是在神经胚形成期，皮肤外胚层从神经外胚层分离不完全所致。
It is the result of incomplete disjunction of the cutaneous ectoderm from neural ectoderm during the process of neurulation.
这是在神经胚形成期，皮肤外胚层从神经外胚层分离不完全所致。
It is the result of incomplete disjunction of the cutaneous ectoderm from neural ectoderm during the process of neurulation.
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