Abstract

To increase the sensitivity of strains of salmonellas used for prel iminary screening of mutagens (potential carcinogens) the use of plasmid pKlVI101 has been suggested [9]. The mechanisms lying at the basis of the action of plasmids on bacterial mutability is not yet known, so that the desirabiiity of their use for assessment of agents dangerous to man is questionable [5]. Data showing that plasmid pKM101 can endow salmonellas with the capacity for induced mutagenesis are particularly interesting. This conclusion was reached from experiments with UV light, which is known to act as a carcinogen [8] but, in the absence of plasmids, does not induce mutations in salmonellas [2].

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