Ammonium cytoplasm outside High Affinity Trans port ve PD Systems: Km=20 NH4 40mmol/m As well as net efflux some ' re-cycles' by co transport NH transport with NH IIIEIIEIEIEE NH4+[& Kti Low Affinity TS channel NH4+ [&K+1? NH3?(Diffusion at high concentrations?) Energetics, kinetics, regulation, genes: Forde Clarkson(1999); Glass et al. (2002)Ammonium cytoplasm outside -ve PD  NH4 +  H+ )  NH4 + ) H+ →  NH4 + [& K+ ]  NH4 + [& K+ ]? NH3? High Affinity Transport Systems; Km=20- 40mmol/m3 Low Affinity TS (Diffusion at high concentrations?) channel H+ co￾transport As well as net H+ efflux, some H+ ‘re-cycles’ by co￾transport with NH4 + Energetics, kinetics, regulation, genes : Forde & Clarkson (1999); Glass et al. (2002) pH 