To investigate the effect of nitrogen sources on the MCE production,
experiments were carried out with three different inorganic
nitrogen sources, namely sodium nitrate (NaNO3), ammonium
nitrate (NH4 NO3) and ammonium chloride (NH4Cl). The S-medium
with the presence or absence of soybean (10 g/L) was further supplemented
with various nitrogen sources at 0.5% level.