"Pet bacteria" collection on a kitchen windowsill. Watch for changes over time. The left-center vials have red iron flocculates. Manganese is present in the left vials, and, after several weeks, the manganese-oxidizing bacteria (Leptothrix discophora) formed rings around the vials. Acid-tolerant bacteria in the right-center vials precipitated yellow flocs. Sulfur bacteria smell like rotten eggs, so the vials are placed in a plastic bag (right).
U.S. Department of the Interior, U.S. Geological Survey
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