Latent H locus in non-motile Escherichia coli

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  • Latent <i>H</i> Locus in Non-motile <i>Escherichia coli</i>
  • Latent <i>H</i> Locus in Non‐motile <i>Escherichia coli</i>

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Transfer of flagellar characters from a motile strain of E. coli K12 Hfr to non-motile strains of E. coli F-by sexual conjugation and transduction tests was done. Motile recombinants were obtained from eight out of ten non-motile strains tested. Non-motile strains of E. coli tested were classified into three genetic groups according to their flagellar characters: (1) Motile recombinants of the first group possessed H antigens other than that of the donor (E. coli K12), or possessed the same H antigens as that of the donor, inheriting their latent H locus intact. (2) The H antigens of the motile recombinants from the second group were always the same as that of donors. Attempts to prove existence of latent H locus in strains in this group by recombination and transduction were unsuccessful. (3) No motile recombinants were obtainable from the third group of non-motile E. coli strains. In addition to the above, some of our experimental data on the motility of E. coli are described.

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