胚细胞

The differentiation and fusion of cells may be therefore the two essential ways for the BMDSCs to change their phenotypes from mesoderm to ectoderm.

细胞转分化和细胞融合有可能是中胚层来源的BMDSCs向神经外胚层细胞变化的两种必要机制。

OBJECTIVE: To study the regulation of bFGF on the blast-colony-forming cell by adding bFGF in the medium of embryoid body generation.

目的：在拟胚体培养阶段施加碱性成纤维细胞生长因子，验证碱性成纤维细胞生长因子对集落形成细胞产生的调控作用。

The part of the embryonic mesoderm, consisting of loosely packed, unspecialized cells set in a gelatinous ground substance, from which connective tissue, bone, cartilage, and the circulatory and lymphatic systems develop.

间叶细胞胚胎的中胚层部分，由生长于胶状基质的、结构松散的、无特定功能的细胞组成，这些细胞将会发育成结缔组织、骨、软骨、血液及淋巴系统

Following the puncture of zona pellucida with two holes by injection pipette that contained donor nuclei or cells, the injection pipette was pulled back to the perivitelline space while the negative pressure was increased in the holding pipette until the polar body and karyoplasm were wiped off completely. Then a reconstructed embryo was completed by the direct injection of the donor nucleus or cell without pulling out the injection pipette.

首先以预先吸有细胞核或细胞的注射针在固定于持卵针上的卵母细胞透明带上穿刺两个孔，然后一边缓慢地将注射针回拔至卵周隙中，一边逐渐增加持卵针中的负压，直至极体与目标核质被完整吸入持卵针中而完成去核，最后在不拔出注射针的情况下直接注射细胞核或完整细胞进而完成重构胚的构建。

The megaspore mother cell is located at the 3rd or 4th layer of cells in the nucellus top end. It divides transversally to form a linear megaspore tetrad, and the megaspore at the chalazal end develops into the embryo sac mother cell.

大孢子母细胞位在珠心顶表皮下第三或四层细胞处，经横分裂后产生一直线形的大孢子四分体，其中位居合点端的大孢子发育成胚囊母细胞。

It needs only 20-30 minutes; the active components can be transformed into high concentration active substances, nonstop to the deep skin, the active components infiltrate to Subcutaneous tissue through the channels among hair follicles, sweat glands and cells, reach the mesoblast .then it open the entrance easily by stimulating the water channels protein on the cell membrane, infiltrate the cell membrane, make the skin cells to absorb nutrients plenary.

需20-30分钟即可将经诱导带电的活性成分快速转换成高浓度的活性物质，直达深层皮肤；利用"水电渗透析"技术，使活性成分通过毛囊、汗腺和经过符合穿孔的表皮细胞间通道透过表皮进入中胚层乃至皮下组织，通过实现细胞蛋白水通道并刺激细胞膜上的"水通道蛋白"，轻易打开表皮入口，渗透细胞膜脂质双分子层，使皮肤细胞充分吸收营养成分。

The part of the embryonic mesoderm, consisting of loosely packed , unspecialized cells set in a

间叶细胞胚胎的中胚层部分，由生长于胶状基质的、结构松散的、无特定功能的细胞组成，这些细胞将会发育成结缔组织、骨、软骨、血液及淋巴系统

When the pollen tube comes into the micropyle and contact one of the synergids, both synergids do not show any sign of degeneration.

在二细胞原胚的顶细胞和基细胞中，均可观察到与合子中形态相似的双亲质体和线粒体。

Histological structures of bursas of Fabricius were observed at the different developmental stages from chicken embryoes to chickens. The results were as follows. The bursa of Fabricius began to develop on the 13th day of post-hatching and its cell aggregated into the nodosity clique underneath the epithelium mucosae. On the 15th day of post-hatching, those cell cliques were surrounded by the flat epithelium and formed the basic structure of folliculus lymphaticus. The number of lymphocytes in the folliculus lymphaticus increased gradually, and the medulla and cortex of a majority of folliculus were not discriminated obviously. Until on the 7th day for chickens, the medulla and cortex of folliculus formed completely and the number of folliculus increased significantly. From 21 to 35 days old, the folliculus lymphaticus transformed from polygon into rectangle. Mucosa epithelial cells increased gradually and their cytoblasts arranged compactly into aline in the basilar part on the 35th day.

本研究观察了从鸡胚到出壳后的不同生长发育阶段法氏囊的组织结构，结果表明：胚胎13日龄时，法氏囊开始发育，粘膜上皮下形成结节状细胞集团；胚胎15日龄，聚集的细胞集团形成初始的淋巴滤泡；胚胎18日龄到出壳后1日龄，滤泡内淋巴细胞数量增多，多数滤泡髓质和皮质界限仍不明显；7日龄雏鸡法氏囊髓质皮质分界清晰，滤泡数量显著增多；21日龄到35日龄，滤泡由多边形逐渐转变成长方形；在35日龄时，粘膜上皮细胞逐渐增多，排列紧密，细胞核紧密排列成直线位于基底部。

The developing tooth is a particularly good model for studies on the regulation of organogenesis, including morphogenesis as well as cell differentiation.

脊椎动物器官在发育过程中的形态发生和细胞分化都是由上皮细胞和外胚间充质细胞的相互作用所调控的。

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。