Enrichment and Isolationof Ferric-Iron-and Humic-Acid-Reducrng Bacteria

In anoxic habitats, ferric iran oxides and humic acids are widespread, and ferric-ironand humic-acid-reducing microorganisms presumably play an importantrole in the oxidationof organic matter. Representative strains of ferric-ironor humic-atid-reducing bacteria were isolated tram a wide range of freshwater or marine environments. Most of them are st~ct anaerobes, and facultatively anaerobic microorgahisms re du ce ferric iran oxides or humic acids only after oxygen hag been 'consumed. Hence, an aerobic techniques have to be used für the preparation of media as weIl as für the cultivation of microorganisms. Furthermore, special caution is needed in the preparation of ferric iran oxides and humic acids.

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