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Elemental distributions of strains AB_14 (pH 5.5) (A) and AB_9 (pH 7) (B) grown in BM medium with or without iron, determined using LA-ICP-MS. The graphs show the signal intensities of Mn depending on the position of bacterial biomass on the agar plate (gray bars) and the availability of Fe. The intensities were normalized to an internal standard (carbon).
