TABLE 2.
Phosphatase and leucine aminopeptidase activities (nmol MUF cm–2 h–1) of microbial communities non-exposed (control) and exposed to 500 or 5,000 ng L–1 of sulfamethoxazole (SMX) or sulfamethazine (SMZ) over time.
| Activity (nmolMUF.cm–2.h–1) | Days | Control | SMX | SMX+ | SMZ | SMZ+ |
| β-glucosidase | 7 | 10.083.63 | 7.953.22 | 5.012.72 | 4.262.31 | 10.391.95 |
| 14 | 7.560.55 | 9.431.04 | 5.220.95 | 8.242.71 | 7.351.92 | |
| 21 | 7.603.34 | 4.162.19 | 2.430.55 | 6.003.13 | 4.271.34 | |
| 28 | 2.661.54 | 2.441.76 | 2.231.91 | 1.150.05 | 1.220.14 | |
| Phosphatase | 7 | 12.570.73 | 7.210.40* | 11.020.84 | 6.181.45* | 9.341.17* |
| 14 | 11.390.53 | 9.120.15* | 12.131.03 | 9.111.01* | 8.560.89* | |
| 21 | 14.010.88 | 17.991.35* | 17.420.93* | 13.452.22 | 13.340.84 | |
| 28 | 57.3826.42 | 65.1020.19 | 66.7018.22 | 49.7812.13 | 43.798.13 | |
| Leucine aminopeptidase | 7 | 3.470.83 | 3.290.39 | 3.440.20 | 3.960.42 | 3.370.42 |
| 14 | 4.350.07 | 7.430.31* | 4.170.37 | 9.081.97* | 3.140.27 | |
| 21 | 13.682.91 | 13.282.67 | 15.961.11 | 16.185.61 | 9.812.64 | |
| 28 | 20.524.49 | 19.645.52 | 16.581.78 | 17.853.86 | 21.304.41 |
Mean ± standard deviation of enzyme activities (nmol MUF cm–2 h–1) measured in the different treatments are indicated (n = 3 per treatment). Stars indicate significant differences between treatments and controls (Dunnett, p < 0.05).