TABLE 3.
YMhun-P, YMPOB-S, qmax, actual ΔG, and YMPOBΔG for propionate-oxidizing S. fumaroxidans grown under three different batch conditions
| Culture | Substrate | YMPOB-S (g [dw] mol of S−1) | YMhun-P (g [dw] mol of P−1) | qmaxa (mol of S [g [dw] d−1]−1) | ΔGb (kJ mol of S−1) | YMPOBΔGc (g [dw] 70 kJ−1) |
|---|---|---|---|---|---|---|
| Monoculture | Propionate + SO42− | 1.24 (0.21) | 0.016 | −74.3 (2.4) | 1.2 | |
| Coculture | Propionate | 1.02 (0.04) | 0.73 (0.07) | 0.204 | −12.6 (2.7) | 5.7 |
| Coculture | Propionate + SO42− | 0.82 (0.04) | 17.7 (2.0) | 0.109 | −62.3 (1.7) | 0.9 |
a
qmax = μmax/YMPOB-S.
b
Values are the actual Gibbs free-energy changes for the conversion of propionate by S. fumaroxidans (reaction 4 in Table 1), syntrophic coculture (reaction 1 in Table 1), and sulfidogenic coculture (reaction 4). The average actual Gibbs free energies between 11 and 29, 8 and 20, and 12 and 26 days, respectively (Fig. 1B, 2B, and 3B), are shown.
c
Measured growth yields (see Table 2), normalized to an energy quantum of 70 kJ mol of S−1, are shown.