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Microbial uptake of lead.

T G Tornabene, H W Edwards

    Science (New York, N.Y.)
    |June 23, 1972
    PubMed
    Summary

    Micrococcus luteus and Azotobacter sp. immobilized significant amounts of lead, primarily in their cell walls and membranes. Lead halides did not impact bacterial growth or viability, indicating potential for bioremediation.

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    Area of Science:

    • Microbiology
    • Environmental Science
    • Bioremediation

    Background:

    • Lead contamination poses environmental and health risks.
    • Microbial interactions with heavy metals are crucial for understanding biogeochemical cycles.
    • Bioremediation strategies utilizing microorganisms offer sustainable solutions for heavy metal pollution.

    Purpose of the Study:

    • To quantify lead immobilization by Micrococcus luteus and Azotobacter sp.
    • To assess the impact of lead halides on bacterial growth and viability.
    • To determine the cellular localization of immobilized lead.

    Main Methods:

    • Bacterial cultures (Micrococcus luteus, Azotobacter sp.) were exposed to lead bromide via dialysis membrane.
    • Lead immobilization was measured using dry weight analysis.
    • Bacterial growth and viability were monitored using culture turbidity and cell counts.
    • Cellular subfractions were analyzed for lead content.

    Main Results:

    • Micrococcus luteus immobilized 4.9 x 10^2 mg lead/g dry cells; Azotobacter sp. immobilized 3.1 x 10^2 mg lead/g dry cells.
    • Lead bromide, iodide, and bromochloride showed no significant effect on bacterial growth or viability.
    • Lead was predominantly localized in the cell wall plus membrane fractions (99.3% and 99.1% for M. luteus and Azotobacter sp., respectively).
    • A small fraction of lead was found in the cytoplasmic fractions.

    Conclusions:

    • Micrococcus luteus and Azotobacter sp. demonstrate significant lead immobilization capacity.
    • Lead halides do not inhibit bacterial growth, suggesting their potential use in bioremediation.
    • The cell wall and membrane are the primary sites of lead accumulation in these bacteria.

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