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  • Isolation and characterization of a mesophilic heavy-metals-tolerant sulfate-reducing bacterium Desulfomicrobium sp from an enrichment culture using phosphogypsum as a sulfate source

    Author(s)
    Azabou, Samia
    Mcehichi, Tahar
    Patel, Bharat
    Sayadi, Sami
    Griffith University Author(s)
    Patel, Bharat K.
    Year published
    2007
    Metadata
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    Abstract
    A sulfate-reducing bacterium, was isolated from a 6 month trained enrichment culture in an anaerobic media containing phosphogypsum as a sulfate source, and, designated strain SA2. Cells of strain SA2 were rod-shaped, did not form spores and stained Gram-negative. Phylogenetic analysis of the 16S rRNA gene sequence of the isolate revealed that it was related to members of the genus Desulfomicrobium (average sequence similarity of 98%) with Desulfomicrobium baculatum being the most closely related (sequence similarity of 99%). Strain SA2 used thiosulfate, sulfate, sulfite and elemental sulfur as electron acceptors and produced ...
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    A sulfate-reducing bacterium, was isolated from a 6 month trained enrichment culture in an anaerobic media containing phosphogypsum as a sulfate source, and, designated strain SA2. Cells of strain SA2 were rod-shaped, did not form spores and stained Gram-negative. Phylogenetic analysis of the 16S rRNA gene sequence of the isolate revealed that it was related to members of the genus Desulfomicrobium (average sequence similarity of 98%) with Desulfomicrobium baculatum being the most closely related (sequence similarity of 99%). Strain SA2 used thiosulfate, sulfate, sulfite and elemental sulfur as electron acceptors and produced sulfide. Strain SA2 reduced sulfate contained in 1-20 g/L phosphogypsum to sulfide with reduction of sulfate contained in 2 g/L phosphogypsum being the optimum concentration. Strain SA2 grew with metalloid, halogenated and non-metal ions present in phosphogypsum and with added high concentrations of heavy metals (125 ppm Zn and 100 ppm Ni, W, Li and Al). The relative order for the inhibitory metal concentrations, based on the IC50 values, was Cu, Te > Cd > Fe, Co, Mn > F, Se > Ni, Al, Li > Zn.
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    Journal Title
    Journal of Hazardous Materials
    Volume
    140
    Issue
    1-2
    Publisher URI
    http://www.elsevier.com/wps/find/journaldescription.cws_home/502691/description#description
    DOI
    https://doi.org/10.1016/j.jhazmat.2006.07.073
    Subject
    History and Archaeology
    Chemical Sciences
    Environmental Sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/18833
    Collection
    • Journal articles

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