Table 3.
The relative number of CFU 24 h after addition of abraded quartz or basalt (average % of initial concentration ± SEM).
| Species | Phase when harvested | PBS control | Inactivated quartz | Quartz exposed to air | Quartz kept anoxic | Inactivated basalt | Basalt exposed to air | Basalt kept anoxic |
|---|---|---|---|---|---|---|---|---|
| P. putida | Exponential growth | 503 ± 116 | 3, 070 ± 480 | 77 ± 27 | 9.2 ± 1.9 | 1, 380 ± 340 | 634 ± 48 | below LOD |
| Stationary | 158 ± 7 | 97 ± 7 | 156 ± 63 | 93 ± 6 | 561 ± 35 | 288 ± 38 | 1.2 ± 0.5 | |
| B. subtilis | Exponential growth | 0.39 ± 0.31 | below LOD | below LOD | 1.2 ± 0.2 | below LOD | 0.026 ± 0.005 | 0.035 ± 0.013 |
| Stationary | 85 ± 6 | 70 ± 2 | 66 ± 5 | 80 ± 3 | 72 ± 8 | 69 ± 2 | 76 ± 7 | |
| D. radiodurans | Exponential growth | 82 ± 19 | 145 ± 29 | 30 ± 4 | 94 ± 7 | 174 ± 15 | 12 ± 4 | below LOD |
| Stationary | 74 ± 12 | 46 ± 26 | 71 ± 8 | 58 ± 13 | 116 (n = 1) | 15 ± 12 | below LOD |