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A Citrobacter sp. accumulates heavy deposits of metal phosphate, derived from an enzymically liberated phosphate ligand. The cells are not subject to saturation constraints and can accumulate several times their own weight of precipitated metal. This high capacity is attributable to biomineralization; uranyl phosphate accumulates as polycrystalline HUO2PO4 at the cell surface. The precipitated metal is indistinguishable from crystalline HUO2PO4.4H2O grown by chemical methods.
Macaskie et al. (Fri,) studied this question.