Fig. 1

Effect of glucose and ammonium concentration on C. salexigens growth. The effect of glucose was analyzed in M63 medium with 30 mM ammonium and 10–100 mM glucose. a Growth rate (dots) and maximum biomass (bars), b specific ectoine (grey bars) and hydroxyectoine (white bars) yields; volumetric productivity of total ectoines (black dots). The effect of ammonium was analyzed in M63 medium with 20 mM glucose and 5–200 mM ammonium. c Growth rate (dots) and maximum biomass (bars), d specific ectoine (grey bars) and hydroxyectoine (white bars) yields; volumetric productivity of total ectoines (black dots). All experiments were performed at 2.5 M NaCl. Error bars denote the experimental deviation of at least three biological replicates. See the text for details