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Inorganic-ion resistance by bacteria isolated from a Mexico City freeway


Bacteria were isolated from soil samples, containing high exchangeable lead concentrations, obtained from a busy freeway in the México City metropolitan area. Forty-five selected strains (86.7% Gram-positive) had a single MIC distribution pattern for lead (800–1600 µg/ml lead nitrate) and were considered lead-resistant. The isolates showed variable levels of resistance to arsenate (86.7%), chromate (66.7%), cadmium (57.6%), and mercury (31.1%) ions. Multiple inorganic-ion resistance was shown by all strains.

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Correspondence to Carlos Cervantes.

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Pacheco, S.V., Miranda, R. & Cervantes, C. Inorganic-ion resistance by bacteria isolated from a Mexico City freeway. Antonie van Leeuwenhoek 67, 333–337 (1995).

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Key words

  • bacteria
  • resistance
  • lead
  • arsenate
  • cadmium
  • chromate
  • mercury