Table 2.
Selected variables and their assigned levels by PDB.
| Levels (g/L) | |||
|---|---|---|---|
| Factors | Code name | Low (−1) | High (+1) |
| Sucrose | A | 100 | 400 |
| Yeast extract | B | 0.2 | 1.0 |
| NaNO3 | C | 0.2 | 2.0 |
| NH4Cl | D | 2.0 | 5.0 |
| KH2PO4 | E | 0.2 | 1.0 |
| NaCl | F | 0.2 | 0.5 |
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