Isolation and Characterization of a Lysogenic Strain of Nocardia erythropolis

  • Crockett J
  • Brownell G
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Abstract

A stable phage-carrying strain of Nocardia erythropolis was isolated from an infection with the nocardiophage φEC. Growth of the strain in phage-specific antiserum for 48 hr produced cured organisms at a frequency of about 0.5%. Spontaneous curing, determined by serial single-colony isolations, was less than 0.4%. The strain could not be infected by phage φEC nor by a closely related phage, φC, although the cells were able to adsorb these phages. In cell populations, a frequency of 2.5 × 10 −4 cells spontaneously induced. The growth rate of the strain was comparable to that of the uninfected wild-type N. erythropolis. Ultraviolet irradiation or treatment with mitomycin C induced the strain to produce larger numbers of phage. It was concluded that the isolated strain was lysogenic.

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Crockett, J. K., & Brownell, G. H. (1972). Isolation and Characterization of a Lysogenic Strain of Nocardia erythropolis. Journal of Virology, 10(4), 737–745. https://doi.org/10.1128/jvi.10.4.737-745.1972

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