胚细胞

The root cap over the tip of the radicle is derived from the closest cell of suspensor.

胚根顶端的根冠来自最近胚柄的细胞。

There were no significant difference amongedifferent adult skin fibroblasts on the cleavage and development of reconstituted embryos.

研究发现来自不同个体的皮肤成纤维细胞所构建的重组胚，卵裂率和囊胚发育率无差异。

Segmentally arranged neuroectodermal tissue that separates from the neural tube dorsally before it closes.

为神经胚的一部分，起源於原阳胚的外胚层。它是一种短暂的结构，其细胞在神经管闭合前很快的开始分散迁徙。

Early division phase embryos may use metabolites provided by the suspensor, persistent and degenerating synergids

早期分裂时期的胚可以利用胚柄，宿存和退化中的助细胞所提供的代谢物。

In this exper iment,we took the advantage of RNAi technique,microinjected tinman and singless dsRNA into the early embryos in Drosophila respectively and got these two genes' RNAi phenotypes,which were very similar to that of their mutant,showing heart tube defects or no heart precursors formation.tinman dsRNA eve caused visceral mesoderm defects and the somatic muscles disruption,yet wingless dsRNA only affected heart precursors and had no effect on visceral mesoderm and somatic muscles,indicationg that the heart-related genes dsRNA interference worked effectively and exclusively in Drosophila.

实验运用RNAi技术，分别将tinman和wingless的dsRNA注入果蝇的早期胚胎，得到了这两个基因的dsRNA干扰表型，与两个基因的突变体表型非常相似，都表现为果蝇心脏前体细胞不能形成或心脏管缺失。尤其是tinman基因的dsRNA，还引起了肠中胚层缺失和体壁肌肉组织的紊乱，而wingless基因的dsRNA却只影响心脏的形成，而不影响肠中胚层，说明dsRNA干扰具有非常强的特异性，因而不失为研究果蝇心脏发育基因功能的有效方法。

Past study re-sults had indicated that MMC in the apomictic type could at most develop to te-trad stage.We observed that the sexual embryo sac of"Pingyi Tiancha"coulddevelop into 4-nuclei embry sac.

前人只观察到无融合生殖类型的大孢子母细胞至多能发育到四分体时期，而我们观察到平邑甜茶的有性胚囊能发育到四核胚囊。

In terms of immunology, uterus is a special reproductive and immune organ. It shows immunological tolerance and immunological rejection respectively at the time of blastocyte implantation and parturition; blastocyte implantation is also concerned with the action of many cytokines and MMPs.

从免疫学角度来讲，母体子宫作为特殊的生殖免疫器官在胚泡着床和分娩时分别表现为免疫耐受和免疫排斥，这两个生理反转过程必然涉及基因的时空差别表达；胚泡植入又涉及大量细胞因子及基质金属蛋白酶的协同参与。

The cleavation rates and blastocyst development rates of cloned embryos were used to assess the efficiency of different operational procedure. Finally, the best combination of operational procedure, that the spindle-viewer system was used for oocytes enucleating, and donor cell was electrofused into ooplasm by electrical pulse (1.9 kV/cm, 10 ms, two) to reconstruct bovine cloned embryos.

以核移植胚胎的卵裂率、囊胚发育率作为检测指标，对不同的方法所获得的克隆胚胎的卵分裂率与囊胚发育率进行比较，最后筛选获得1个优化的牛体细胞核移植操作程序，即采用Spindle view系统对牛卵母细胞进行去核操作，将供核体细胞注射到卵周隙，然后通过电融合法将供体核引入去核卵细胞质(电融合参数为1.9 kV/cm，脉冲时程10 ms，方波2次间隔2 s)。

Cytohistological observations of embryogenic callus of litchi and longan were carried out by paraffin slice.

通过石蜡切片观察荔枝、龙眼胚性愈伤组织的结构和胚性细胞分裂生长的方式。

Simmer. Results: Immunohistochemistry showed that the temporal and spatial expression patterns of AMELX, AMBN and ENAM in ameloblasts and enamel matrix were different. With the mineralization of enamel matrix, expression of AMELX decreased, but it weakly expressed in adjacent bone.

结果：免疫组化结果显示，三种蛋白在三种小鼠牙胚的成釉细胞、釉质、牙本质中的表达存在时空顺序差异，随着牙胚发育和釉质成熟，AMELX呈递减表达，而AMBN和ENAM则较恒定表达。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。