Table 3.
The range and the levels of the variables
| Factor | Variable | Unit | Range and level of actual and coded values | ||||
|---|---|---|---|---|---|---|---|
| −α | −1 | 0 | 1 | α | |||
| peptone | A | g L−1 | 0.688 | 2 | 4.5 | 7 | 8.311 |
| Cd | B | mM | 0.237 | 0.5 | 1 | 1.5 | 1.762 |
| L/S | C | – | 3.475 | 4 | 5 | 6 | 6.524 |
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