title: [Researches on metal-resistance and conjugation-transfer in "Escherichia coli" strains (author's transl)].
abstract: The resistance for HgCl2, NaAsO2, Co(NO3)2, NiSO4, ZnSO4, Agtno3, and CdSO4 in 40 strains of Escherichia coli, was investigated. In 16 of 23 Hg-resistant strains, resistance transfer was obtained by means of conjugation with Salmonella typhi. Hg-resistance was present only in antibiotic-resistant strains, but no correlation was possible with any antibiotic-resistance determinants: because Hg-resistance transfer may occur independently, and it is possible to obtain clones spontaneously segregant for the mentioned trait. As for the possible mechanisms of bacterial metal-resistance, several hypothesis were prospected, the most credible one that of a detoxification of the metallic salt.
mesh_terms: D001149:Arsenates / Q000494:pharmacology; D002104:Cadmium / Q000494:pharmacology; D003035:Cobalt / Q000494:pharmacology; D003227:Conjugation, Genetic; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects*; D008628:Mercury / Q000494:pharmacology; D008670:Metals / Q000494:pharmacology*; D009532:Nickel / Q000494:pharmacology; D009566:Nitrates / Q000494:pharmacology; D011815:R Factors; D012485:Salmonella typhi / Q000187:drug effects; D012835:Silver Nitrate / Q000494:pharmacology; D012964:Sodium / Q000494:pharmacology; D013431:Sulfates / Q000494:pharmacology; D015032:Zinc / Q000494:pharmacology
chemical_list: D001149:Arsenates; D008670:Metals; D009566:Nitrates; D013431:Sulfates; D002104:Cadmium; D003035:Cobalt; D009532:Nickel; D012835:Silver Nitrate; D012964:Sodium; D008628:Mercury; D015032:Zinc
vernacular_title: Ricerche sulla metallo-resistenza e sulla sua trasmissibilità, per coniugazione, in stipiti di "Escherichia coli".