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Position and appearance of Beggiatoa sp. 35Flor mats in hydrogen-supplemented and -unsupplemented oxygen-sulfide gradient media. The cultures were grown under low-sulfide-flux conditions over 4 weeks. Culture tubes were photographed after 7, 14, 21, and 28 days of growth in the presence (left panels; +) and absence (right panels; –) of a diffusional hydrogen gradient. The scale bar on the left indicates the depth below the air-agar interface.
