Fig 4.
Initial concentrations and the order of assimilation of the nitrogen compounds in SM200 cultures. Initial concentrations of nitrogen compounds (in mg N liter−1) and the T50NR, which is the mean ratio for the 14 strains between the time for consumption of 50% of each available nitrogen source and the time required for the consumption of 50% of total available nitrogen. The standard errors of the means for the 14 strains are indicated by the vertical error bars. Horizontal bars depict the results (nonsignificant) of Tukey's HSD comparisons for nitrogen compounds at a P level of 0.05.