胚胎发育

The pattern of lunar cycle can be classified into three strategies:(1) Planulation of S. hystrix and P. damicornis showed clear lunar periodicity and the peak of larval release shifted with different months. The peak of planulation occurred around the full moon in winter then shifted gradually to the first quarter moon phase in summer. The phase shift of larval release may be related to the seasonal variation of seawater temperature and the sudden temperature drops caused by upwelling.(2) Planulation of S. pistillata showed clear lunar periodicity and the peak of larval release occurred around the full moon.

在月周期方面可分成三种生殖策略：(1)尖枝列孔珊瑚与细枝鹿角珊瑚释放幼生不但有明显的月周期，而且释放幼生的高峰会随著月份而移动，由冬季至夏季期间，高峰从满月前后转变至上弦月前后；再由夏季至冬季期间，高峰从上弦月前后转变至满月前后，而此变动形成一个完整的年周期，原因可能与海水温度影响配子发育和胚胎速度与夏季期间涌升流所造成的降温有关。

The morphological transition of the epithelial-mesenchymal compartment by serial transverse sections of the apical end toward the incisal direction is likely to reflect the development of the tooth germ in the prenatal stage.

此上皮突的根冠向连续横断面组织切片显示为上皮—间充质之间形态的转变，就如同胚胎时期牙胚的发育过程。

Results: During the development of spinal cord. NIDD mRNA was highly expressed at embryo 16 d and at postnatal 1 d, and co-localized with nNOS in the undifferenti ated ventral horn, as well in white matter. And then it decreased significantly till postnatal 12w. nNOS mRNA was highly expressed from postnatal 1 d to 3 d. The high expression of NIDD mRNA appeared at the 8 hour after spinal cord injury, and co-localized with nNOS in neurons of ventral horn, intermedial zone, the area around central canal and dorsal horn, and recovered to the normal at dry 7 day after SCI.

结果：大鼠发育过程中，胚胎16 d的大鼠脊髓中可见NIDD mRNA的高表达，在生后1d，与nNOS共表达于尚未分化成熟的前角，在白质也见NIDD的阳性信号成年后呈低表达；nNOS mRNA于生后1~3 d出现表达高峰；脊髓损伤后NIDD mRNA表达明显增多，在8 h到达高峰，分布于脊髓前角，中间带、中央管周围及后角nNOS阳性的神经元，7 d恢复至正常水平；nNOS mRNA在损伤后8 h达到高峰，1 d降低至正常水平。

Objective To offer reference for further studying the pathogeny of congenital megacolon by studying the development of colon ENS in human embryos.

目的 研究人胚胎结肠肠神经系统的发育过程，为进一步研究先天性巨结肠的发病机制提供参考。

Numerous experiments show that embryonic renal stem cells were drived from metanephric mesenchyma which induced by ureteric buds.

胚胎肾干细胞发育时，渗透压、氧压等多种因素组成的微环境提示髓质部可能是成体干细胞存在区域，肾乳头部为千细胞的壁龛。

Having or characterized by a robust,muscular body build caused by the predominance of structures developed from the embryonic mesodermal layer.

具有运动型体格的由胚胎中胚层发育而来，因结构占优势而促成健壮高大的体型的、或以此为特征的

The layer of flat cells of mesodermal origin that lines the embryonic body cavity and gives rise to the squamous cells of the peritoneum, pericardium, and pleura .

间皮起源于中胚层的扁平细胞层，衬于胚胎的原始体腔中，最终发育成腹膜、心包及胸膜的上皮细胞

Furthermore, cultured in this method, NSCs can proliferate in an undifferentiated state in vitro, allowing them to be expanded mitotically and harvested in bulk.

切片培养法，应用这种方法，可以在尽量接近体内环境的条件下研究NSCS在胚胎大脑皮质发育中的形态与作用。

Objective To study the relationship of nephroblastoma to the differentiation and development of fetal kidney and to the existence of nephrogenic rest.

目的 探讨肾母细胞瘤发生与胚胎肾分化发育及肾源性剩余的关系。

Neuroectoderm; neural crest; neural plate; floor plate; neural tube; neuraxis; neurulation; neuroblasts; neural stem cells; neuroprogenitor cells; stem cells; differentiation; ontogeny; morphogenesis; histogenesis; organogenesis; synaptogenesis; gangliogenesis; embryogenesis; axonogenesis; retinogenesis; gliogenesis; glial progenitor cells; oligodendrocyte progenitor cells; retinal progenitor cells; nerve growth factor; neurotrophic factors; trophic factors; growth factors; neural tube defects; anencephaly; spina bifida; neuroblastoma cells; neurogenesis; development; developmental stages

神经外胚层；神经脊；神经板；底板；神经管；轴索；神经胚形成；成神经细胞；神经干细胞；神经母细胞；干细胞；分化；个体发生；形态发生；组织发生；器官发生；突触发生；神经节发生；胚胎发生；轴突发生；视网膜发生；神经胶质发生；神经胶质祖细胞；少突神经胶质细胞祖细胞；视网膜祖细胞；神经生长因子；神经营养因子；营养因子；生长因素；神经管缺陷；无脑；脊柱裂；成神经细胞瘤细胞；神经发生；发展；发育阶段

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。