排序方式: 共有53条查询结果,搜索用时 781 毫秒
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的探讨新生大鼠海马神经干细胞(NSC)的体外培养和诱导分化的条件和特点。方法分离出生1d大鼠海马,在表皮生长因子、碱性成纤维生长因子和B27联合作用下使其稳定增殖,用5-溴脱氧尿苷(BMU)标记处于增殖状态的神经干细胞,应用免疫荧光染色方法行巢蛋白(Nestin)、5-溴脱氧尿苷(BrdU)、β-Ⅲ型微管蛋白(Tuj-1)、波形蛋白(Vimenfin)和Galc-C免疫荧光染色,对NSC的增殖及其分化的细胞进行鉴定。结果体外培养的NSC增殖成神经干细胞球并传代,鉴定为Nestin染色阳性细胞和5-溴脱氧尿苷(BrdU)标记染色阳性细胞,并可诱导分化为神经元细胞(Tuj-1染色阳性细胞)、神经胶质细胞(Vimentin染色阳性细胞)和少突胶质细胞(GMc-C染色阳性细胞)。结论采用无血清培养基中加入特定生长因子的培养技术,可培养出在体外稳定增殖并有多向分化潜能的新生大鼠海马神经干细胞。 相似文献
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火炬松树干液流的研究 总被引:21,自引:2,他引:21
采用ICT-2000TE树干液流测定系统,研究了密度为1020株/hm^2的11年生火炬松秋季树干液流特征及其与环境因子的关系。结果表明:火炬松树干液流表现为单峰曲线,日出后,树干液流迅速上升,峰值出现在中午前后,日落后至次日日出前液流微弱或几近无上升液流;树干液流速度白天10时至17时平均约26cm/h,最大达到54cm/h;不同径阶火炬松树干液流流量差异极显著。4株样木的胸径分别为13.5,10.2,15.7,16.6cm,秋季耗水量分别为13.28,13.27,36.33,49.80kg/d。环境因子对树干液流的影响次序由大到小依次为:气温、相对湿度、光合有效辐射、土壤温度、土壤水分;逐步回归建立的方程达到极显著水平。 相似文献
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本文依据天文万年历研究了医用历四柱干支显现的基本规律:(1)共有518400种四柱干支组;历经一个60甲子年显现的一半;历经2个60甲子年显现的3/4;历经3个60了年大多数显现;历经4个60甲子年才全部显现。(2)四柱干支历经4个60甲子年基本重现,医用历轮回周期的240年。 相似文献
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《自然科学进展(英文版)》2020,30(5):597-608
The precise regulation of cell fate by biomaterials is one of the core focuses in tissue engineering and regenerative therapeutics. Cell fate is controlled by the niche signaling cues, including growth factors/morphogens, direct cell-cell contact, and extracellular matrix components. Here, we discuss how to bio-mimic cell-cell interaction by tailoring the interface of biomaterials to design effective scaffolds. Cadherins, as a key cell membrane protein family mediating the intercellular adherens junction, have attracted extensive attention in the functional modification of biomaterials. Therefore, cadherin-based biomaterials, their ability to modulate stem cell fate, and their applications in regenerative medicine are reviewed. Furthermore, we provide an outlook for exploiting the bio-mimic biomaterials in advanced cell therapeutics. 相似文献
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Neuroreplacement therapy and stem cell biology under disease conditions 总被引:22,自引:0,他引:22
Sugaya K 《Cellular and molecular life sciences : CMLS》2003,60(9):1891-1902
Recent advances in stem cell technology are expanding our ability to replace a variety of cells throughout the body. In the past, neurological diseases caused by the degeneration of neuronal cells were considered incurable because of a long-held 'truism'; neurons do not regenerate during adulthood. However, this statement has been challenged, and we have now found much evidence that the brain is indeed capable of regenerating neurons after maturing. Based on this new concept, researchers have shown neural differentiation of stem cells and recovery of function following transplantation of these cells into the brain. These results may promise a bright future for clinical applications of stem cell strategies in neurological diseases; however, we must consider the pathophysiological environments of individual diseases that may affect stem cell biology. Before we begin to develop clinical applications, we must consider environmental factors that have not been discussed in the current preclinical studies. Here, we study cases of Alzheimer's disease and schizophrenia and discuss the effects of environmental factors under disease conditions.Received 15 January 2003; received after revision 7 April 2003; accepted 8 April 2003 相似文献
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栀子花试管快速繁殖的研究 总被引:2,自引:0,他引:2
栀子花具芽茎段在适宜浓度的BA,Kt与NAA的MS培养基中,可获得增殖芽丛。切割芽丛继代培养进行苗的增殖。NAA利于出根,IBA有助于根的伸长。20d试管苗生根率达100%,小苗移栽成活率达85%-90%。 相似文献
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张沛中 《阜阳师范学院学报(自然科学版)》2003,20(3):46-47
本文试述干细胞的生物学基本特征及其应用价值,以便于进一步认识干细胞,更好地为教学、研究服务。 相似文献