Table 4 Natural levels and interval of variation in the independent variables in the design of cellulose production
From: Optimized culture conditions for bacterial cellulose production by Acetobacter senegalensis MA1
Factors | Codes | Levels | Interval of variation | ||
|---|---|---|---|---|---|
-1 | 0 | + 1 | |||
Carbon | Glycerol (mL L− 1) | 45.0 | 50.0 | 55.0 | 5.0 |
Nitrogen | Yeast extract (g L− 1) | 5.0 | 7.5 | 10.0 | 2.5 |
pH | Â | 4.0 | 6.0 | 8.0 | 2.0 |
Temperature | °C | 30.0 | 33.5 | 37.0 | 3.5 |
Additive | PEG 6000 (g L− 1) | 0.0 | 2.5 | 5.0 | 2.5 |