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NPN uptake kinetics of mid-logarithmic phase of E. coli and A. veronii cell suspension (A); Effect of increasing concentrations of colistin on the uptake of NPN into the outer membrane of E. coli ATCC 25922 (B); A. veronii ATCC 35624 (C); E. coliR (D) and A. veroniiR (E).
