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Growth and morphology of strains HCA1 and PS0. Correlation between ammonia oxidation and growth of HCA1 (A) and PS0 (B) in an artificial seawater medium containing 500 µM NH4+ and 100 µM α-ketoglutaric acid. Transmission electron micrographs of negative-stained cells of HCA1 (C) and PS0 (D). (Scale bars: 200 nm.)
