Table 4.
ANOVA analysis and statistical parameters of the fitted quadratic polynomial model for the optimization of medium compositions.
| Source | Sum of squares | Degrees of freedom | Mean square | F-value | p-value | |
|---|---|---|---|---|---|---|
| Model | 0.1184 | 9 | 0.0132 | 14.00 | 0.0011 | Significance |
| A | 0.0215 | 1 | 0.0215 | 22.91 | 0.0020 | ** |
| B | 0.0209 | 1 | 0.0209 | 22.25 | 0.0022 | ** |
| C | 0.0017 | 1 | 0.0017 | 1.79 | 0.2227 | ns |
| AB | 0.0065 | 1 | 0.0065 | 6.90 | 0.0341 | * |
| AC | 0.0010 | 1 | 0.0010 | 1.02 | 0.3455 | ns |
| BC | 0.0005 | 1 | 0.0005 | 0.56 | 0.4775 | ns |
| A2 | 0.0468 | 1 | 0.0468 | 49.85 | 0.0002 | ** |
| B2 | 0.0175 | 1 | 0.0175 | 18.66 | 0.0035 | ** |
| C2 | 0.0054 | 1 | 0.0054 | 5.74 | 0.0478 | * |
| Residuals | 0.0066 | 7 | 0.0009 | |||
| Lack of fit | 0.0050 | 3 | 0.0017 | 4.14 | 0.1018 | Not significance |
| Pure error | 0.0016 | 4 | 0.0004 | |||
| Cor total | 0.1249 | 16 | ||||
| R2 = 0.9474 | ||||||
| Adjusted R2 = 0.8797 | ||||||
A: glucose; B: yeast extract; C: MgSO4. *, significant (p < 0.05); **, very significant (p < 0.01); ns, not significant (p > 0.05).