搜索结果: 1-6 共查到“理学 EcoRI”相关记录6条 . 查询时间(0.046 秒)
用于DNA无性繁殖的EcoRI接头的化学合成
无性繁殖
2008/2/4
摘要利用二酯法化学合成了一个脱氧八核苷酸(d-G-G-A-A-T-T-C-C)。此八核苷酸片段自身互补形成双链DNA片段,能被限制性内切酶EcoRI酶解。利用双向同系层析测定了它的核苷酸序列,证明这一片段的序列符合实验设计要求。
摘要本文以质粒pAT153为载体,以E.coli SK1592为受体菌,将北京鸭肝脏mtDNA的2.17kb的EcoR I/BamHI限制片段进行了克隆,并对重组质粒作了限制性内切酶分析、Southern吸印与杂交 分析。此外,还对重组体的一些性质作了初步研究,并对鸭肝mtDNA的另一个EcoRI/BamHI片 段(2.81 kb)不能被克隆的原因进行了讨论。
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本文从pAmy41和pNL201出发,构建了一系列α-淀粉酶基因上游区EcoRI-BclII片段缺失或部分缺失的质粒,并构建了含有pAmy41系列单质粒pAmy41系列、pNL201系列双质粒工程菌。通过对这些工程菌α-淀粉酶基因表达水平的分析显示,B.licheniformisα-淀粉酶基因上游区EcoRI-BclI片段在α-淀粉酶基因表达中行使负的调探功能。
一些限制性内切酶能够诱发CHO细胞染色体畸变已经不同实验所证实[11,4.5.77。有作者提出限制性内切酶的致染色体畸变作用类似于电离辐射,即这种作用是非S期依赖性的闻。最近,又有作者详细研究了Alul对处于细胞周期各个时相的染色体的作用〔17o Alul识别序列为4个碱基对,产生平切末端,而对另一大类识别序列为6个碱基对,产生粘性末端的限制酶则尚无研究。为此,我们以CHO细胞为材料,观察了Eco...
A Comparative Study on the Recovery of EcoRI Endonuclease from Two Different Genetically Modified Strains of Escherichia coli
EcoRI endonuclease recombinant E. coli purification enzyme recovery
2010/6/27
A laboratory scale procedure developed for the purification of EcoRI restriction endonuclease was applied to two different Escherichia coli} strains, E. coli 294 and E. coli M5248, which are genetical...
Optimization of Starting Time and Period of Induction and Inducer Concentration in the Production of the Restriction Enzyme EcoRI from Recombinant Escherichia coli 294
EcoRI restriction enzyme induction enzyme purification
2010/6/30
Induction parameters including inducer concentration, period of induction and the cell concentration at which inducer is to be added to the fermentation broth were optimized in order to increase the y...