plasmid

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English[edit]

Plasmids
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Etymology[edit]

From plasma +‎ -id, coined 1952 by American molecular biologist Joshua Lederberg.

Pronunciation[edit]

Noun[edit]

plasmid (plural plasmids)

  1. (cytology) A loop of double-stranded DNA that is separate from and replicates independently of the chromosomes, most commonly found in bacteria, but also in archaeans and eukaryotic cells, and used in genetic engineering as a vector for gene transfer.
    • 1995, Christopher Howe, Gene Cloning and Manipulation, page 144:
      This is how the F (for "fertility") plasmid, which forms the basis of a lot of classical E. coli genetics, is transferred from one cell to another.
    • 1999, Matt Ridley, Genome, Harper Perennial 2004, p. 247:
      Bacteria are happy to absorb little rings of DNA called plasmids and adopt them as their own.
    • 2004, Karl Friehs, Plasmid Copy Number and Plasmid Stability, M. Beyer, T. Scheper (editors), New Trends and Developments in Biochemical Engineering, Volume 86, page 47:
      Plasmids have an essential impact on productivity. Related factors are plasmid copy number, structural plasmid stability and segregational plasmid stability.

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