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“Ca. Nitrosotenuis aquarius” micrographs. (A and B) CARD-FISH micrographs of enrichment cultures using the probe Arch915 (FITC tyramides; green), counterstained with DAPI (blue). Scale bar, 10 μm. (C) Scanning electron micrograph of unstained “Ca. Nitrosotenuis aquarius” cells. Scale bar, 1 μm. (D to F) Transmission electron micrographs of negatively stained “Ca. Nitrosotenuis aquarius” cells (2% uranyl acetate). Scale bar, 100 nm. Arrows in panel E indicate cellular appendages.
