Table 1. PHB contents under photoheterotrophy supplied with a different organic substrate.
| Organic substrate | PHB content (% w/w DW) | |||
|---|---|---|---|---|
| NORMAL | -N | |||
| Supplied concentration (% w/v) | ||||
| 0.2 | 0.4 | 0.2 | 0.4 | |
| Acetate | 0.7 ± 0.2* | 0.8 ± 0.4* | 5.3 ± 1.2* | 11.8 ± 2.1* |
| Pyruvate | 0.3 ± 0.2 | 0.4 ± 0.3 | 0.7 ± 0.7 | 0.5 ± 0.4 |
| Citrate | 0.4 ± 0.2 | 0.3 ± 0.1 | 4.2 ± 0.3* | 5.7 ± 0.9* |
| Glucose | 0.7 ± 0.3* | 3.4 ± 1.0* | 3.1 ± 5.3* | 6.7 ± 0.4* |
| Fructose | 1.2 ± 0.5* | 3.2 ± 0.9* | 2.8 ± 1.2* | 8.1 ± 1.4* |
5% (v/v) of C. fritschii was cultured in normal nutrient (NORMAL) or nitrogen-limiting (-N) medium containing the indicated organic substrate under light for 20 d.
Data are the average ± 1 SD from three independent cultures.
*Significantly higher PHB content (two-tailed t-test, P < 0.05.) than the PHB content obtained from the same nutrient condition, but without organic substrate (NORMAL = 0.20 ± 0.12% w/w DW, -N = 1.42 ± 0.45% w/w DW).