Figure 3

Influence of varying concentration of nitrogen source on growth and product formation by D. nepalensis NCYC 3413. Time course of (a) substrate utilization, (b) growth and formation of (c) ethanol and (d) arabitol. The medium was supplemented with different concentrations of ammonium sulphate (3–6 g/L). The initial pH was adjusted to 6.0 and the culture was incubated at 30°C and 180 rpm for 120 h. All experiments were performed three times and the values reported are mean with standard deviation.