Time course of cell growth, 2,4-DNP uptake, and nitrite release by Rhodococcus strain RB1 cultured with 2,4-DNP as the sole nitrogen source. Cells were grown under aerobic conditions with 50 mM sodium acetate and 0.5 mM 2,4-DNP. A600 (•), 2,4-DNP concentration (○), and nitrite concentration (▴) were measured at the indicated times.