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BMSCs can be induced into neural stem cells and further neural stem cells derived from bone marrow can differentiate into neural cells and neuroglial cells.

骨髓基质细胞能在体外诱导分化出神经干细胞，且骨髓源性神经干细胞可进一步定向分化为神经细胞及神经胶质细胞。

However, hair follicle stem cells prefer hair destiny in vivo, unless the injury of epidimal or sytogland occurs. In 1990, Cosarelis et al. proposed "The Bulge activated hypothesis", they think the signal moleculars emit from the dermal papillar induce the downward migration and differentiation of hair follicle stem cells.

然而，体内正常情况下毛囊干细胞首先向毛发谱系定向分化，只有在表皮或皮脂腺受到损伤时，它们才进行程序重组而向表皮或皮脂腺方向分化。1990年，Cosarelis等提出毛囊的&隆突激活假说&，认为来源于毛乳头的信号因子触发了毛囊干细胞向下迁移并分化，从而维持了毛发周期的正常循环。

［Objective］To construct eukaryotic expression vector containing Sox9 derived from immortalized precartilaginous stem cells and to probe its inductive effect on marrow stroma cells differentiating into precartilaginous stem cells.

［目的］从永生化骨骺干细胞中克隆Sox9基因并构建真核表达载体，并探讨Sox9诱导骨髓基质细胞向骨骺干细胞分化的可能性。

To study the biologicaleffect of pulsed electromagnetic fieldson the proliferation of Immunomagneticseparated human precartilaginous stem cellsin vitro.To establish immortalizedhuman precartilaginous stem cellsstrain and provided stable cell resource to studythe molecular mechanism of gene targeting on differentiation of PSCs.①The cells from the aborted fetus\'s metaphysis were digested by collagenase,the PSCs were isolated by magnetic-activated cell sorting,then were subculturedand amplified.

探讨体外分离、培养人前软骨干细胞的可行性，分析其表型特点；研究脉冲电磁场对免疫磁性细胞分选的人前软骨干细胞增殖的生物学影响；构建猿肾病毒40大T抗原基因(SV40Tag)介导的永生化人前软骨干细胞株，为下一步基因打靶研究其分化分子机制提供稳定的细胞来源。

Among its many biological activities, the major function of GM-CSF is to stimulate hematogenie stem cells prolification from silent stage to S phage, so that the stem cells can differentiate into granulocyte-macrophage cells.

有4个外显子和3个内含子，基因定位于5号染色体长臂5q21-5q32区，大多数器官均能产生GM-CSF，GM-CSF有多种生物活性，作用于多种细胞谱系，其主要作用是刺激造血祖细胞增殖即从静止期进入S期，并分化为粒细胞---单核巨噬细胞。

The critical nitrogen content in heading period was used to calculate the biggest accumulation quantity of nitrogen. The latent distribution index of leaf and stem, which was the variety heredity parameter, were used to distinguish the difference in nitrogen assignment in different varieties. The dynamic content of the nitrogen accumulation before anthesis could be described with a Richards model. The dynamic content of the nitrogen remobilization in leaf with leaf area index could be described with a power model, and the nitrogen absorption of grain from soil with dry weight could be described with a power model. The dynamic content of nitrogen density in stem and spike with physiological development time could be described with a nonlinear model.

模型利用抽穗期植株临界含氮量来表达氮素最大积累量，引入叶片潜在分配指数和茎鞘潜在分配指数2个品种遗传参数来区别不同品种在器官间的氮素分配差异，采用Richards方程来描述大麦花前氮素积累动态变化；采用指数函数方程来描述叶片氮的转移量随叶面积指数的动态变化以及籽粒从土壤中吸收的氮量随干物重的动态变化；采用非线性函数方程描述茎鞘和穗部的氮浓度随生理发育时间的动态变化。

The model were validated by experiment data from Nanjing,the result showed that the value of RMSE of leaf length and width,petiole length and width,main stem internodes length and width,sympodial stem intemodes width,cotton boll height and diameter was 0.48cm、0.65cm、0.53cm、0.09cm、0.02cm、0.55cm、0.28cm、0.23cm、0.14cm、0.17cm、0.20cm、0.11cm,respectively,which indicated the model was accurate and the prediction were better.

利用同年南京相应条件下的试验数据对模型进行了检验，检验结果表明，棉花主茎叶片长度、宽度、叶柄长、主茎节间长、主茎节间粗和果枝叶片长度、宽度、叶柄长度、果节长度、果节直径、蕾铃高度和直径的RMSE值范围分别为0.48cm、0.65cm、0.53cm、0.09cm、0.02cm、0.55cm、0.28cm、0.23cm、0.14cm、0.17cm、0.20cm、0.11cm。

These include immortalized stem cell lines, neural progenitors prepared from embryonic and adult animals and mesenchymal stem cells.

这些措施包括永生化的胚胎干细胞，来源于胚胎的和成年动物的神经祖细胞以及间充质干细胞。

Then the number of larvae in the stem increased sharply for a great number of newly-hatched larvae appeared. Though some larvae transferred from stem to root before overwintering, about 43% of the larvae overwintered in tree stems at the height between 40 and 120 cm in the end of September till after the overwintering the next year.

之后，由于初孵幼虫的大量出现，使干部幼虫数量急剧增加，越冬前，虽然有部分转移至根部危害，但到9月末仍有近43%的幼虫停留在树干40～120cm处越冬，直到次年越冬结束。

This investigation was to establish a simplified culture system to isolate and passage brain tumor stem cells from human medulloblastoma, observe their proliferation and differentiation, and determine the expression of normal neural stem cell antigens, CD133 and Nestin, in BTSCs. METHODS: Eleven specimens of medulloblastoma were acutely dissociated and triturated into single cells without trypsin digestion.

本研究旨在利用简化的无血清培养基和悬浮培养方法，从人髓母细胞瘤中分离培养脑肿瘤干细胞，观察其在体外的增殖、分化，鉴定其特异性标志物CD133和Nestin的表达，验证肿瘤组织切片中CD133阳性细胞的存在，为脑肿瘤干细胞的进一步研究打下基础。

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％。