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centuryrain

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[交流] 【求助/交流】谁帮解释一下multimeric plasmid具体是什么含义

看文章中有multimeric plasmid这个词,没有查到具体的定义,谁能详细解释一下这个词的含义吗?多谢!
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centuryrain(金币+1):谢谢参与
centuryrain(金币+2): 2011-03-04 14:47:05
rainwander(金币+2): 鼓励积极参与交流~~~ 2011-03-04 18:11:15
多体质粒,指不同的质粒形式的混合物:超螺旋,开环。

http://www.qiagen.com/plasmid/agarosegelanalysis.aspx 上有说明

Lane 2: Multimeric forms of supercoiled plasmid DNA (pTZ19) which may be observed with some host strains, and should not be mistaken for genomic DNA. Multimeric plasmid DNA can easily be distinguished from genomic DNA by a simple restriction digestion: linearization of a plasmid sample displaying multimeric bands will yield a single defined band with the size of the linearized plasmid monomer (see lane 3).
Lane 3: Linearized form of plasmid pTZ19 after restriction digestion with EcoRI.
Lane 4: Sample contaminated with bacterial chromosomal DNA, which may be observed if the lysate is treated too vigorously (e.g., vortexing during incubation steps with Buffer P2 or P3). Genomic DNA contamination can easily be identified by digestion of the sample with EcoRI. A smear is observed, in contrast to the linear band seen after digestion of multimeric plasmid forms.
2楼2011-03-04 13:19:55
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