Table 2.
Concentration ranges of the variables used in the central composite design
| Factors (g/L) | Actual levels of coded factors -1 0 + 1 |
||
|---|---|---|---|
| Tryptone | 5 | 10 | 15 |
| Meat extract | 5 | 10 | 15 |
| Thiamine | 0.5 | 1 | 1.5 |
| Magnesium sulfate | 0.5 | 1 | 1.5 |
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