A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. Plasmids naturally exist in bacterial cells, and they also occur in some eukaryotes.

Here the human gene for insulin is inserted into a plasmid. This is a small closed circle of DNA present naturally in bacteria. When the bacterium divides, all the bacteria will carry the plasmid ...

A scaleable method for the liquid-phase separation of plasmid DNA from RNA. In the course of experiments on the potential of nucleic acid compaction for enhancement of chromatographic adsorption ...