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Lethal and mutational effects of solar and UV radiation on Staphylococcus aureus

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Abstract

Strains of Staphylococcus aureus, an opportunistic pathogen commonly found on human skin, were exposed to sunlight and UV C radiation, and the lethal and mutational effects measured. Sunlight killed cells with an inactivation constant of 3×10-5 per joule per square metre; UV C was much more lethal, giving an inactivation constant of approximately 0.1 per joule per square metre. Some strains tested showed a sensitivity to sunlight that was dependent on the growth phase of the cells, exponentially growing cells showing a greater sensitivity. Mutational effects of irradiation were measured by the appearance of mutants sensitive to methicillin following irradiation of a multiresistant strain. Mutants appeared at a frequency of 10-3; this high frequency of mutation in the region of the mec gene has also been observed when multiresistant strains are subjected to nutritional or thermal stress. Mutants showed the same chromosomal alteration (seen in pulse-field gel electrophoresis of Smal-digested DNA) whether induced by solar or UV C irradiation.

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Authors and Affiliations

  1. Biochemistry Department, Faculty of Science, Australian National University, 2601, Canberra, ACT, Australia

    Robin M. Chapple, Barbara Inglis & Peter R. Stewart

Authors
  1. Robin M. Chapple
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  2. Barbara Inglis
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  3. Peter R. Stewart
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Chapple, R.M., Inglis, B. & Stewart, P.R. Lethal and mutational effects of solar and UV radiation on Staphylococcus aureus . Arch. Microbiol. 157, 242–248 (1992). https://doi.org/10.1007/BF00245157

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  • DOI: https://doi.org/10.1007/BF00245157

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