TABLE 1.
Summary of pertinent MAB characteristicsa
| Biofilm | O2 at membrane (mg liter−1) | O2 penetration (μm) | Final thickness (μm) | Avg protein (mg ml−1) | Avg carbohydrate (mg ml−1) | Bulk dry cell mass (mg ml−1) | Location of maximum respiratory activity (μm) | Total respiratory activity (μg mm−2) |
|---|---|---|---|---|---|---|---|---|
| Air (2 cm s−1) | 10.4 ± 0.5 | 1,000 ± 100 | 3,600 ± 900 | 3.2 | 2.8 | 12 | 900 | 2.5 |
| O2 (2 cm s−1) | 34.1 ± 1.9 | 2,100 ± 300 | 3,200 ± 1,000 | 4.9 | 2.0 | 12 | 1,100 | 2.9 |
| Air (14 cm s−1) | 9.1 ± 0.3 | 600 ± 100 | 2,400 ± 960 | 6.8 | 5.0 | 70 | 500 | 4.4 |
| O2 (14 cm s−1) | 32.8 ± 2.9 | 1,600 ± 400 | 4,900 ± 400 | 4.5 | 4.0 | 66 | 1,300 | 3.4 |
a
Grown at fluid velocities of 2 cm and 14 cm s−1. Distances of oxygen penetration and maximum respiratory activity are relative to the membrane.