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Related Experiment Videos

Cadmium accumulation by a Citrobacter sp.

L E Macaskie, A C Dean

    Journal of General Microbiology
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Citrobacter sp. bacteria can accumulate cadmium, but growth is inhibited. Resting cells or immobilized cells show enhanced cadmium uptake and tolerance, suggesting potential for bioremediation.

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    Area of Science:

    • Environmental microbiology
    • Bioremediation
    • Heavy metal accumulation

    Background:

    • Cadmium (Cd2+) is a toxic heavy metal pollutant.
    • Bacterial accumulation of heavy metals is a key area in bioremediation research.
    • Citrobacter sp. exhibits cadmium accumulation, but growth inhibition is a challenge.

    Purpose of the Study:

    • To investigate methods for enhancing cadmium accumulation by Citrobacter sp.
    • To explore the potential of resting and immobilized cells for cadmium bioremediation.
    • To elucidate the mechanism of cadmium uptake and tolerance.

    Main Methods:

    • Culturing Citrobacter sp. under varying cadmium concentrations.
    • Comparing cadmium uptake in growing versus resting cells.

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  • Assessing cadmium removal by immobilized cells in a flow system.
  • Investigating the role of cell treatments and buffer composition.

    • Main Results:

    • Growing cells showed peak cadmium accumulation but significant growth inhibition.
    • Resting cells tolerated higher cadmium concentrations and exhibited enhanced uptake.
    • Immobilized cells removed 65% of cadmium from a flowing solution.
    • Cadmium uptake is likely mediated by a cell-bound phosphatase.

    Conclusions:

    • Pre-culturing and utilizing resting or immobilized Citrobacter sp. enhances cadmium tolerance and uptake.
    • This approach offers a viable strategy for cadmium bioremediation.
    • The mechanism involves cadmium precipitation as cell-bound cadmium phosphate via phosphatase activity.