Bacterial resistance to heavy metals related to extractable and total metal concentrations in soil and media (original) (raw)
1993, Soil Biology and Biochemistry
To assess the effects of heavy metal pollution on terrestrial systems, bacteria are frequently isolated from such environments and metal tolerance of the isolates determined by plating on media amended with high concentrations of metal salts. We have found that metal concentrations added to media in traditional assays are orders-of-magnitude higher than water soluble concentrations of Zn, Cd and Ni in soil, even highly contaminated soil. Further, many soil bacteria are intrinsically resistant to high concentrations of heavy metals, thereby precluding the need to adapt to metal contamination.
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