Fig. 2

Pi uptake via PhnCDE and Ugp. Bacteria were resuspended in TG medium containing 0.2 mM ³²P(KH ₂PO₄). Samples were withdrawn every 20 s and the level of incorporated radioactivity (cpm counts) was measured. Blue square, strain RS07 (phn⁺3 Δ); green triangle, strain RS05 (ugp⁺3 Δ); red circle, wild-type strain. Each bar represents the mean ± S.E.M. of three independent cultures