胚细胞

We used the medaka as a fish model for the development of ES cell technology. We have established feeder cell free culture conditions and obtained several ES cell lines from midblastula embryos.

我们以青鱂作为建立鱼类ES细胞技术的模式，通过建立并应用无滋养层细胞的培养条件，获得了来自中期囊胚的ES细胞系。

The present study is involved in the expression of vitronectin , a ligand of integrin, on human spermatozoa and its role in fertilization; the expression of integrin α〓、α〓、β〓 sbunits on human and mouse oocytes and their relationship with maturation of oocytes; the reorganization of cytoskeletal protein, actin, of mouse oocytes mediated with RGD peptide binding with integrins; the roles and mechanisms of integrins in activation of mouse oocytes as trasmembrane signaling receptors, using the methos of cell culture, immunohistochemistry, flow cytometer, laser confocal microscope.

本课题采用细胞培养、免疫组化、流式细胞术、激光共聚焦显微技术进行以下四个方面的研究：整合素配体玻连蛋白在人精子的表达及其与精子功能状态及受精的关系：整合素〓在人、小鼠卵的表达及其与卵的成熟程度的关系：整合素介导小鼠卵内actin骨架蛋白的重组；整合素介导卵激活的早、晚期事件，包括卵细胞内钙离子浓度的变化及孤雌发育胚的形成，并探讨其机制。

Fibroblast growth factor is a kind of the polypeptide growth factors, which is known to be a mitogen for a wide variety of mesoderm-and neuroectoderm-derived cells and a neurotrophic factor for several neuronal cell types.

成纤维细胞生长因子是一种对中胚层及神经外胚层源的细胞都有促分裂活性的多肽生长因子，也是一种重要的神经营养因子。

Methods The guts of embryonic mice removed and dissociated were plated into serum-free DMEM/F12 medium. The mitogen-free DMEM/F12 medium supplementd with 10% fetal bovine serum was used to induce differentiation of GNCSCs. Neurospheres and their derivations were determined with immunocytochemical and immunofluorescent staning.

分离胚鼠肠管，消化后接种于添加N2、B27和碱性成纤维细胞生长因子的DMEM/F12培养基，贴壁培养；连续传代后用血清促进GNCSCs分化；最后用免疫细胞化学方法染色鉴定。

Methods The guts of embryonic mice removed and dissociated were plated into serumfree DMEM/F12 medium. The mitogenfree DMEM/F12 medium supplementd with 10% fetal bovine serum was used to induce differentiation of GNCSCs. Neurospheres and their derivations were determined with immunocytochemical and immunofluorescent staning.

分离胚鼠肠管，消化后接种于添加N2、B27和碱性成纤维细胞生长因子的DMEM/F12培养基，贴壁培养；连续传代后用血清促进GNCSCs分化；最后用免疫细胞化学方法染色鉴定。

Flounder FoxD1 mRNA was over expressed in one cell of the two-cell stage zebrafish, MyoD expression in the somites on one side was reduced, but the expression in the adaxial cells was not affected; Myf5 expression in the presomitic mesoderm, adaxial cells and somites on one side was reduced.

在斑马鱼中过量表达FoxD1后，MyoD在一侧体节中的表达受到了严重抑制，而在近轴细胞中的表达未受影响，Myf5在体节前中胚层，近轴细胞，及体节中的表达都受到了抑制。

With the development of embryo, Myf5 expression decreased gradually in somites in the anterior region, but remained strong in the newly formed somites; After 30 somites formed, MyoD expression decreased in the somites except the caudal somites. At the hatching stage, MyoD and Myf5 were expressed in head muscle cells and fin muscle cells. In the growing fish, Myf5 was expressed in the skeletal muscle and intestine, and in adult flounder, Myf5 was only expressed in muscle. In the growing fish and adult fish, MyoD was only expressed in muscle.

在胚胎发育早期，Myf5在近轴中胚层中表达，体节发生过程中，Myf5在体节中表达，MyoD基因最早在分节板的体节前细胞中表达，随后在近轴细胞、体节中表达；随着胚胎的发育，Myf5在成熟体节中表达量降低，在新生体节中表达较强；MyoD自30个体节时期后只在新生的尾部体节中表达，在成熟的体节中表达量降低；在孵化期，MyoD和Myf5在头部及鳍的肌肉、尾部的体节中表达；生长期的牙鲆中，Myf5在骨骼肌和肠中表达，成体牙鲆中，Myf5只在肌肉中表达；生长期的牙鲆及成体牙鲆中，MyoD只在肌肉组织中表达。

At 24 h, Ang1 was expressed mainly in the lens, optic cup, mesencephalon, ventral part of hindbrain, and myotomes in the somites, while zfTie2 was mainly expressed in intersomitic vessels including dorsal aorta and axial veins, and sprouting vessels from the dorsal aorta in the trunk. VEGF was expressed mainly in the lens, optic cup, mesencephalon and myotomes in the somites, while zfFlk1 was mainly expressed in intersomitic vessels including dorsal aorta and axial veins, and sprouting vessels from the dorsal aorta in the trunk.

结果从受精卵胚胎发育第12小时可见血管内皮细胞生长因子和血管发生素1及其相应受体flk1和Tie2的表达；在受精卵胚胎发育的第16小时，血管内皮细胞生长因子和血管发生素1主要在头部和尾部胚芽表达；第24小时在眼球、视窝、中脑、后脑的腹前侧和肌节中表达，Tie2和Flk1主要在肌间背部动脉血管、躯干新生血管芽和轴向静脉中表达。

In conclusions,(1) The pronuclear formation was asynchronous after ICSI in buffalo, the female pronuclear formed 3 hours earlier than male pronuclei;(2) After ICSI and activation, Culture of oocytes in 1.9mmol/L 6-DMAP for 3 hours can improve their subsequent embryonic development;(3) Treatment of sperm with 5mmol/L DTT can promote sperm decondensation;(4) Dead sperms can be used for ICSI in buffaloes;(5) Treatment of sperm with GSH can improve the efficiency of ICSI in buffaloes.

以上结果表明：(1)水牛精子胞质内显微受精的雌、雄原核发育不同步，雌原核比雄原核早3h形成；(2)水牛卵母细胞ICSI和激活后用1.9mmol／L 6-DMAP培养处理3h能提高其胚胎发育率；(3)DTT预处理水牛精子能提高其ICSI后的精子解聚率；(4)死精子能用于水牛卵母细胞的ICSI；(5)GSH预处理水牛精子有助于提高其ICSI后的囊胚发育率。

It inferred that cbfal might play a key role during tooth development especially during the differentiation of odontoblasts and ameloblasts.

表明cbfal参与了牙胚发育过程，尤其是在成牙本质细胞和成釉细胞分化中可能起着重要作用。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失