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plasmid    
质粒

质粒

plasmid
n 1: a small cellular inclusion consisting of a ring of DNA that
is not in a chromosome but is capable of autonomous
replication [synonym: {plasmid}, {plasmid DNA}]

Plasmid \Plas"mid\, n. (Molecular genetics)
A piece of DNA, usually circular, functioning as part of the
genetic material of a cell, not integrated with the
chromosome and replicating independently of the chromosome,
but transferred, like the chromosome, to subsequent
generations of daughter cells. In bacteria, plasmids often
carry the genes for antibiotic resistance; they are exploited
in genetic engineering as the vehicles for introduction of
extraneous DNA into cells, to alter the genetic makeup of the
cell. The cells thus altered may produce desirable proteins
which are extracted and used; in the case of genetically
altered plant cells, the altered cells may grow into complete
plants with changed properties, as for example, increased
resistance to disease.
[PJC]


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  • Plasmid - Wikipedia
    Plasmid Diagram of a bacterium showing chromosomal DNA and plasmids (Not to scale) A plasmid is a small, extrachromosomal DNA molecule within a cell that is physically separated from chromosomal DNA and can replicate independently
  • Plasmid - National Human Genome Research Institute
    A plasmid is a small circular DNA molecule found in bacteria and some other microscopic organisms Plasmids are physically separate from chromosomal DNA and replicate independently
  • Plasmids 101: What is a plasmid? - Addgene
    What is a plasmid? At their most basic level, plasmids are small circular pieces of DNA that replicate independently from the host's chromosomal DNA They are mainly found in bacteria, but also exist naturally in archaea and eukaryotes such as yeast and plants
  • Plasmid | DNA replication, genetic engineering, cloning . . .
    plasmid, in microbiology, an extrachromosomal genetic element that occurs in many bacterial strains Plasmids are circular deoxyribonucleic acid (DNA) molecules that replicate independently of the bacterial chromosome They are not essential for the bacterium but may confer a selective advantage
  • Plasmids- Definition, Properties, Structure, Types, Functions . . .
    The term Plasmid was coined by Joshua Lederberg in 1952 Plasmids are important as genetic tools, which are used to introduce, manipulate or delete certain genes from the host cell
  • What is a Plasmid? | Ask A Biologist
    A plasmid is an independent, circular, self-replicating DNA molecule that carries only a few genes The number of plasmids in a cell generally remains constant from generation to generation
  • What Is a Plasmid in Biology and How Does It Work . . .
    Once a gene is incorporated, the recombinant plasmid can be introduced into host cells, typically bacteria, for replication This process allows for the production of numerous gene copies or the expression of the gene to synthesize desired proteins
  • A Brief History of Plasmids - PMC
    In the late 1950s, a number of laboratories took up the study of plasmids once the discovery was made that extrachromosomal antibiotic resistance (R) factors are the responsible agents for the transmissibility of multiple antibiotic resistance among
  • Subverting Plasmids To Combat Antibiotic Resistance
    Two types of plasmids, colored red and blue, form intricate patterns as they compete for dominance in a bacterial colony Image: Fernando Rossine Researchers in the Blavatnik Institute at Harvard Medical School have just opened a new window into understanding the development of antibiotic resistance
  • Plasmids: Properties, Types, and Functions - Microbe Online
    Artificial plasmid or recombinant plasmid is the plasmid formed by recombining the bacterium’s DNA with desired DNA fragments The process of transformation helps in introducing the DNA fragments to the gene





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