TABLE 3.
Accumulation of radioactivity by cells of S. herbicidovorans MH grown on succinate, 2,4-D, (R)-dichlorprop, and (S)-dichlorprop
| Assay substrate | Mean accumulation of radioactivity (c′i/ce)a ± SD of cells grown on:
|
|||
|---|---|---|---|---|
| Succinate | 2,4-D | (R)-Dichlorprop | (S)-Dichlorprop | |
| 2,4-D | 20 ± 1 | 134 ± 27 | 108 ± 14 | 103 ± 15 |
| (R)-Dichlorprop | 15 ± 8 | 3 ± 3 | 114 ± 17 | 5 ± 1 |
| (S)-Dichlorprop | 25 ± 6 | 0 | 0 | 116 ± 13 |
a
c′i is the apparent intracellular substrate concentration, which was obtained in the presence of catabolic activity and consequently represents the sum of the intracellular concentrations of the substrate and all metabolites. ce is the external substrate concentration in the transport assay (60 μM).