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Tolerance of M. magneticum AMB-1 to SeO32− and magnetite nanoparticle synthesis. The numbers of cells (□) and of magnetite crystals (●) grown in different concentrations (0, 5, 10, 20, 40, 60, 80, 100, and 250 μM) of SeO32− were directly counted. To evaluate the number of magnetite crystals within the cells, over 50 cells randomly selected were manually counted. Error bars show standard deviations.
