Fig. 2. Initial mineralization of (A) ¹⁴C-isoproturon (IPU), (B) ¹⁴C-monodesmethyl-isoproturon (MDIPU), and (C) ¹⁴C-4-isopropyl-aniline (4IA) aged for 1 (crosses), 49 (closed triangles), 71 (open squares), or 131 (closed squares) d and inoculated with Sphingomonas sp. strain SRS2. Note that the ordinate scales differ. The values are the mean of two or three replicates. The vertical bars indicate ±1 SD.