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Variables and their levels for arginine deiminase production by E. faecium sp. GR7.
| Factor (g/L) | Low level star point (−α) | Low level factorial (−1) | Central point (0) | High level factorial (+1) | High level star point (+α) |
|---|---|---|---|---|---|
| A-tryptone | −0.23 | 0 | 15 | 30 | 40.23 |
| B-lactose | −6.82 | 0 | 10 | 20 | 26.87 |
| C-arginine | −6.82 | 0 | 10 | 20 | 26.817 |
