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Time-resolved laser fluorescence spectra of uranyl bound to P. aeruginosa. Polyphosphate-filled cells were resuspended in 1 mM uranyl nitrate, and samples were subsequently taken for TRLFS analysis. Uranyl appears to sorb to cells as a uranyl hydroxide species and then, as phosphate is secreted from the cell, is precipitated to the surface of the cell as uranyl phosphate. d, days.
