0.68 ± 0.06 g/L; however, the growth was limited when the urea concentration was higher than 0.5 g/L (data not shown). Within the urea range from 0.5 to 2.0 g/L, the biomass concentration in
the urea experiment decreased from 0.6 ± 0.05 to 0.5 ± 0.04 g/L. In the medium with 0.1–2.0 g/L of urea, the specific growth rate during 7 days and maximal specific growth rate slightly decreased
as the urea concentration increased (Fig. 4).