FIG. 2.

Effects of DCCD on nitrite uptake by NA3 cells at pH 9.6 and at pH 7.2. Cells grown in nitrate (60 mM)-containing medium were suspended in nitrogen-free media at the indicated pH values to a Chl concentration of 5 μg per ml and then were preincubated for 10 min in the light in the presence or absence of DCCD (10 μM). Nitrite (ca. 100 μM) was added at time zero to the cell suspensions, and changes in the nitrite concentration in the medium were monitored.