Table 1. The most probable numbers of culturable micro-organisms and the total number of cells in groundwater from borehole ONK-PVA06 sampled on 23 September 2010.
| Analysis | Cells ml–1 | Amol ml–1 | s.d. (n=3) | Upper–lower 95% confidence interval (cells ml–1) |
|---|---|---|---|---|
| Total number of cells | 37 000 | — | 6100 | — |
| ATP | 27 300 | 3170 | — | |
| Cultivable heterotrophic aerobic bacteria | 16 300 | — | 3210 | — |
| Nitrate-reducing bacteria | 90 000 | — | — | 30 000–290 000 |
| Iron-reducing bacteria | 500 | — | — | 200–2000 |
| Manganese-reducing bacteria | 220 | — | — | 100–580 |
| Sulphate-reducing bacteria | 80 | — | — | 30–250 |
| Autotrophic acetogens | 17 | — | — | 7–48 |
| Heterotrophic acetogens | 110 | — | — | 40–300 |
| Autotrophic methanogens | <0.2 | — | — | — |
| Heterotrophic methanogens | <0.2 | — | — | — |