Profiles of main products and glucose of strain ES04/PCK+PYC under pH-controlled conditions. The pH was maintained at 7.0 (A), 5.7 (B), and 5.5 (C). Symbols indicate glucose (open circles), succinate (closed circles), pyruvate (open triangles), and malate (closed triangles). Data from three independent experiments are shown. Error bars indicate ±SD.