Table 2.
The growth conditions (±SE) achieved for T. erythraeum IMS101 when cultured at three target gas-phase CO2 concentrations (Low=180 µmol mol–1, Mid=380 µmol mol–1, and High=720 µmol mol–1), saturating light intensity (400 µmol photons m–2 s–1), and optimal temperature (26 °C)
| Variable | Units | Low CO2 | Mid CO2 | High CO2 |
|---|---|---|---|---|
| pH | – | 8.458 | 8.174 | 7.906 |
| H+ | nM | 3.5 (0.20) | 6.7 (0.13) | 12.4 (0.28) |
| AT | µM | 2431 (70) | 2447 (54) | 2442 (56) |
| TIC | µM | 1800 (69) | 2039 (46) | 2201 (50) |
| HCO3– | µM | 1362 (67) | 1743 (39) | 2005 (44) |
| CO32– | µM | 435 (16) | 289 (9) | 179 (6) |
| CO2 | µM | 3.3 (0.3) | 8.1 (0.2) | 17.3 (0.5) |
| NH4+ | µM | 1.03 (0.14) | 1.00 (0.08) | 1.08 (0.06) |
| NO3– | µM | 0.34 (0.05) | 0.32 (0.03) | 0.30 (0.02) |
| n | 89 | 67 | 39 |
Individual pH values were converted to a H+ concentration, allowing a mean pH value (Total scale) to be calculated. Dissolved inorganic NH4+ was determined using the phenol-hypochlorite method as described by Solorzano (1969), while dissolved inorganic NO3– was determined using the spectrophotometric method as described by Collos et al. (1999).