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Effects of nitrate on the uptake of nitrite at pH 9.6 by nitrate (60 mM)-grown cells of the wild-type strain (WT) and NA3. Nitrite (100 μM) was added at time zero to the cell suspensions containing 5 μg of Chl per ml, with and without simultaneous addition of nitrate. Changes in the nitrite concentration in the medium are shown.
