Abstract
WAVELENGTHS of light between 320 and 400 nm are lethal to many microorganisms1, especially to airborne cells held in a semi-dehydrated state2–4. In addition, this waveband of light produces a few drug5 and phage6 resistant cells when growing cultures are continuously irradiated, and its mutagenic action is enhanced by cell semi-dehydration in aerosols3,4. We report here results which suggest that the irradiation of semi-dehydrated airborne cells with 320–400 nm light produces specific mutations.
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