Research Article
Enhanced Cellulase Production from Bacillus subtilis by Optimizing Physical Parameters for Bioethanol Production
Table 3
Result of Student’s t-test for alkaline CMCase activity and the cell growth in the optimization study.
| Term | CMCase activity (U/mL) | Cell growth (g/L) | | | | |
| Constant |
28.927
| 0.000 |
57.032
| 0.000 | pH () |
4.229
| 0.002 |
3.518
| 0.006 | Temperature (°C) () |
8.712
| 0.000 |
4.355
| 0.001 | Agitation (rpm) () | −4.341 | 0.001 |
8.136
| 0.000 | () | −0.192 | 0.852 | −8.511 | 0.000 | () | −7.938 | 0.000 | −13.026 | 0.000 | () | −0.728 | 0.483 | −5.272 | 0.000 | | −1.848 | 0.094 | −0.207 | 0.840 | |
0.387
| 0.707 |
0.259
| 0.801 | | −3.332 | 0.008 |
2.482
| 0.032 |
|
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t statistic is the coefficient divided by its standard error, is probability of incorrectly rejecting the null hypothesis when it is actually true.
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