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Related Experiment Videos

Bacterial interactions with chromate.

C Cervantes1

  • 1Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana, Morelia, Michoacán, México.

Antonie Van Leeuwenhoek
|May 1, 1991
PubMed
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Certain bacteria can detoxify toxic hexavalent chromium (Cr(VI)) by reducing it to less harmful trivalent chromium (Cr(III)). Strains resistant to and capable of reducing Cr(VI) show promise for treating industrial wastewater.

Area of Science:

  • Environmental microbiology
  • Bioremediation
  • Toxicology

Background:

  • Hexavalent chromium compounds (chromates, dichromates) are highly toxic, mutagenic, and carcinogenic industrial pollutants.
  • Environmental discharge of hexavalent chromium is frequent due to various industrial activities.
  • Microbial resistance and reduction of hexavalent chromium are key survival and detoxification mechanisms.

Purpose of the Study:

  • To highlight the potential of microorganisms in mitigating hexavalent chromium pollution.
  • To explore bacterial strains with combined chromate resistance and reduction capabilities.
  • To assess the utility of these microbial strains for wastewater treatment.

Main Methods:

  • Investigating microbial reduction of hexavalent chromium to trivalent chromium.

Related Experiment Videos

  • Identifying bacterial strains with inherent chromate resistance determinants, often plasmid-mediated.
  • Characterizing strains that exhibit both resistance and reduction of chromate.

    • Main Results:

    • Microorganisms possess the ability to reduce toxic hexavalent chromium to less toxic trivalent chromium.
    • Chromate pollution selects for bacterial strains with resistance mechanisms, frequently linked to plasmids.
    • Bacterial strains demonstrating both chromate resistance and reduction are identified.

    Conclusions:

    • Microbial reduction of hexavalent chromium offers a viable detoxification pathway.
    • Bacterial strains with dual chromate resistance and reduction capabilities are valuable assets.
    • These specialized microbial strains hold significant potential for the bioremediation of chromate-contaminated wastewater.