Table 1 The higher and lower levels of selected the variables applied for PBD analysis
Factors | Representation Code | Unit | Level | |
|---|---|---|---|---|
Low (− 1) | High (+ 1) | |||
Glucose | A | g/L | 5 | 20 |
Yeast extract | B | g/L | 2 | 10 |
K2Cr2O7 | C | g/L | 0.05 | 0.25 |
K2HPO4 | D | g/L | 0.5 | 1 |
NaNO3 | E | g/L | 1 | 2 |
MgSO4·7H2O | F | g/L | 0.5 | 1 |
NaCl | G | g/L | 0.5 | 1 |
pH | H | No units | 3 | 9 |
Temperature | I | 0C | 20 | 32 |