Feeder layer- and serum-free culture of rhesus monkey embryonic stem cells

The common culture system of rhesus monkey embryonic stem (rES) cells depends largely on feeder cells and serum, which limits the research and application of rES cells. This study reports a feeder layer-free and serum-free system for culture of rES cells.

懒猴血红蛋白血清蛋白及同工酶的研究

用聚丙烯酰胺凝胶电泳技术分析了蜂猴(N. coucang)和倭蜂猴(N. pygmaeus) 的血红蛋白(Hb)、乳酸脱氢酶、酯酶、苹果酸脱氢酶同功酶。用醋酸薄膜电泳分 析了蜂猴和倭蜂猴的血清 蛋白成分, 并进行了比较。懒猴的LDH-B含量明显低 于高等灵长类。

Additional angles to calculate the deformation of RNA helices induced by bulge loops

Bulges are common features of folded RNA structures. The RNA axial kinking caused by bulges has been confirmed by many experiments. Usually, a kinking angle zeta and a bending angle theta are used to describe the kinking and twisting of RNA molecules containing bulges. Here, we present two additional angles (twist angle zeta(1), twist angle zeta(2)) to describe the deformation of RNA helices induced by bulge loops because only two angles (a kinking angle zeta and a bending angle theta) are not enough to define the deformation of RNA induced by bulges. (C) 2002 Elsevier Science B.V. All rights reserved.

池塘中的氧气循环及翻塘的发生机理

<正>目前又到了鱼塘容易发生翻塘的季节,在此介绍一些有关池塘中氧气循环的知识,以便更好地认识翻塘发生的机理和发生规律,便于积极地防止翻塘现象的发生。一、冬天的氧循环在冬天,由绿色植物和藻类的光合作用产生的氧减少,这是因为从秋天开始这些植物和藻类会正常地相继死亡,数量就会减少,

伊乐藻、苦草和菹草对磷急性胁迫的响应

国家十五重大科技专项(2002AA601021); 淡水生态与生物技术国家重点实验室开放课题; 河南省科技攻关项目(0624440039)资助