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The results suggest that Smad4,one of the intracellular downstream molecules of TGF-β superfamily,and an inductive signal mediating epithelial-mesenchymal interaction,may regulate the differentiation of ameloblast and odontoblast cells,and modulate dentinogenesis and amelogenesis.

结论首次观察到Smad4信号分子在人牙胚发育过程中的表达，Smad4作为TGF-β超家族细胞内信号分子，可能参与上皮间充质的相互作用，同时也参与成釉细胞和成牙本质细胞的分化以及牙釉质和牙本质的形成。

The biologic character with will epithelial to amnion article reachs his to try to sum up in the application in nerve regeneration.

本文将对羊膜上皮细胞的生物学特性及其在神经再生中的应用加以综述。

We got the result: Bufo Raddei Strauch Tadpole (1) Bufo Raddei Strauch Tadpole was capable of lens regeneration, which originated from the epithelial cells at iris dorsal margin by dipigmentation.(2) Dipigmentation of Bufo Raddei Strauch by two methods: one was licked up by amoebocyte, the other one was flowed from the pigment cells.(3) In the lens regeneration cells of Bufo Raddei Strauch profiles of the mitochondria became complicated ribosome manifold, and the endoplasmic reticulum was cisternal dilation. During the process of deferentiation of lens fiber the cell nucleolus became little and chromatin shrinked.(4)The crystalline electrophoresis of Bufo Raddei Strauch Tadpole lens regeneration showed that during lens regeneration P-crystalline was expressed earliest then was γ-crystalline and α-crystallin, this result is consistent with newt.

结果表明：花背蟾蜍蝌蚪(1)具有晶状体再生的能力，其晶状体的再生来源于虹膜背缘的上皮细胞；(2)虹膜背缘去色素是转分化的前提，主要有两种方式：一种也是最主要的方式是在晶状体被摘除后虹膜外侧产生巨噬细胞，巨噬细胞吞噬虹膜色素上皮细胞中的色素颗粒；另一种方式是虹膜色素上皮细胞自身释放色素颗粒；(3)电镜观察发现虹膜色素上皮细胞转分化过程中线粒体有明显变化，核糖体增多，粗面内质网增多，晶状体纤维分化过程中细胞核逐渐凝聚；(4)SDS-PAGE电泳发现，花背蟾蜍蝌蚪晶状体再生中相关蛋白表达顺序与有尾类蝾螈相似，蛋白表达顺序依次是β-晶状体蛋白、γ-晶状体蛋白和α-晶状体蛋白，并且后两种蛋白几乎同时表达。

Objective:To investigate the effects of fluvastatin on proliferation of human renal tubular epithelial cell induced by AngiotensinⅡ.

目的：观察氟伐他汀对血管紧张素Ⅱ诱导的肾小管上皮细胞增殖的影响。

After lentectomy through the pupillary hole, the epithelial cells at dorsal iris in Anuran tadpole of Bufo raddei Strauch can undergo transdifferentiation to regenerate a new lens. The morphological changes of lens formation from different regeneration stages were observed with both microcope and transmission electron microscope.

以无尾两栖类花背蟾蜍后肢芽期蝌蚪为实验材料，摘除其左眼晶状体，在再生不同时期固定，石蜡连续切片，苏木精-伊红对染，光镜观察，研究晶状体再生的组织来源；另外，选再生不同时期材料用戊二醛，锇酸固定，透射电镜观察，以研究晶状体再生组织的超微结构变化。

Objective To study the physiological properties of sodium channels in the apical membrane of human nasal epithelial cells.

目的 明确人鼻粘膜上皮细胞Na+通道的特性，为研究Na+通道在鼻粘膜病理性改变及治疗中的作用奠定理论基础。

The apical membrane of the epithelial cells is apparently essential.

上皮细胞的顶膜显然是必要的。

This close apposition enables endothelial cells and epithelial cells to communicate with each other by release of growth factors and hormones.

这一紧密并列使两者能通过释放生长因子和激素彼此通信。

Objective To study the toxic effect of body fluid of Ascaris lumbricoides on human intestinal epithelial cells (HCT-8 cells) and how the ABF concentration and inducing time could be related to the toxicity.

目的 探讨人蛔虫体腔液(Ascaris body fluid， ABF)对人肠上皮细胞株(HCT-8)的毒性作用及作用浓度和时间的关系。

Objective: To investigate, 1 whether the body fluid of Ascaris lumbricoides could induce apoptosis of human alveolar epithelial cells (A549 cells) in vitro, and if there would be a possible relationship of ABF concentration or inducing time with the extent of apoptosis; 2 if the expression of bcl-2/bax would involve in and how it changes during the inducement of the apoptosis of A549 cells.

目的：用人蛔虫体腔液(Ascaris body fluid，简称ABF)体外诱导人肺上皮细胞株(A549)，观察其是否能够诱导靶细胞凋亡及凋亡与ABF浓度和作用时间的相互关系；运用RT-PCR方法检测靶细胞诱导过程中bcl-2／bax基因的表达变化，探讨其凋亡与基因表达的相互关系。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。