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. 1987 Apr;53(4):740–744. doi: 10.1128/aem.53.4.740-744.1987

Influence of immobilization on the stability of pTG201 recombinant plasmid in some strains of Escherichia coli.

M Nasri, S Sayadi, J N Barbotin, P Dhulster, D Thomas
PMCID: PMC203748  PMID: 3555337

Abstract

The stability of pTG201 plasmid was examined by continuous culture in three genetically different Escherichia coli hosts. Two types of experiment were carried out, one with free cells and one with immobilized cells. When cells were cultivated in free continuous culture in the absence of antibiotic selection, the plasmid was maintained with various degrees of stability in the three host organisms. By contrast, in continuous culture with immobilized cells, plasmid pTG201 was stably maintained in the three strains. We showed that the increase in pTG201 stability in immobilized cells is due neither to plasmid transfer between immobilized cells nor to an increase of the plasmid copy number of immobilized cells. We also showed that plasmid-free cells, when coimmobilized and grown in competition with plasmid-containing cells, cannot overrun the culture.

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Selected References

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