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Secondly, according to the stem and leaf anatomy, leaf epidermis, pollen morphology and floral development, it is found that there are no close relations between Acorus and Typhales, especially in the aspect of floral development. In the course of floral development of A. calamus, neither bracteloe primordium nor common primordium occurs in the whole course. Early development of the flower is strongly unidirectional. Three shield carpels develop into a pistil. In Sparganium fallax, each female flower has a bracteole. The bracteole primordium and the floral primordium originate from a complex structure. A single saccate carpel develops into a pistil. In staminate flowers, petal and stamen primordia initiate spirally.

菖蒲属与香蒲目的茎叶解剖特征、叶表皮特征、花粉特征及花器官发生特点等亦存在着明显区别，特别是花器官发生特点差异尤为显著，如菖蒲属花器官发生过程中，没有苞片原基，也不存在任何形式的复合原基，花被与雄蕊原基均以单向性方式发生，雌蕊由3心皮发育而成，具有&盾状心皮&的特点等，黑三棱属则有苞片原基发生，且苞片原基与雌花原基起源于共同的复合结构，雄花的花被原基和雄蕊原基均以螺旋状方式发生，雌蕊由单心皮发育而成，未发现有2或3个心皮原基或其痕迹的现象，体现出&囊状心皮&的特点。

Objective: To compare the effect of isolation methods and culture systems on spermatogonial stem cells from chicken.

目的：比较不同分离方法和培养体系对鸡精原干细胞生长的影响。

Males, whether they are mouse or man, generate a constant supply of new sperm from self-renewing spermatogonial stem cells.

男性的人，不论是鼠标或男子，产生一个不断供应新的精子，从自我革新精原干细胞。

METHODS: Triceps brachii was sterilely collected from 3 rats, and muscle-derived stem cells were isolated in vitro, and purified by adherence method.

取3只大鼠，无菌条件下切取肱三头肌，体外分离培养肌源性干细胞，贴壁法纯化扩增。

On basis of mention , we investigate the ability of isolation, purification and expansion of adult rat mesenchymal stem cells to nerve cells in vitro.MethodsBone marrow mononuclear cells from adult rat femur and tibia were obtained sterilely by Percoll ( 1. 073 103 g/L ) gradient centrifugation .

根据MSCs与其它细胞的密度不同而采用Percoll(1.073×10~3g／L)分离液将其分离，此方法分离MSCs所获得的细胞种类较单一，Percoll分离液将骨髓细胞分为三层，取含MSCs的低密度层进行培养。

Objective\ To isolate neural stem cells from striatum of adult rats.

目的 从成年大鼠纹状体区分离并鉴定神经干细胞。

AIM: To study the effect and mechanism of all-trans retinoic acid on neural stem cell proliferation and differentiation from new born Sprague-Dawley rat striatum.

目的：研究全反式视黄酸对体外培养的NSCs分裂增殖和分化的作用及其机制。

Extraction and Determination of Total Flavonoids from Root,Stem and Leaf of Suaeda australis

目的单因素试验了不同体积分数的乙醇、料液比、提取温度及提取时间等因素对南方碱蓬叶总黄酮提取率的影响。

By investigating the regeneration feasibility of mesenchymal stem cells,which is derived from endothelial and subendothelial cells of human umbilical vein,to neuron-like cells in vitro,we want to provide new evidence for the transplantation of hUV-derived MSCs to nervous tissue.

探讨来源于人脐静脉内皮及内皮下分离的间充质干细胞向神经元样细胞分化的可能性，以期为脐静脉MSCs的神经移植提供理论依据。

The stem,which settled on the bottom almost 1,800 ft. from the bow,had swiveled 1800 on its way down.

船尾在下沉时旋转了180度，它在海底离船首几乎有1800英尺远。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。