Research Article
Production of Proteolytic Enzymes by a Keratin-Degrading Aspergillus niger
Table 3
Main effects and interaction analysis for protease production by A. niger growing on feather meal.
| Factors | Effect protease | Standard error | t value | P value |
| Medium | 11.02078 | 0.355983 | 30.9588 | 0.000074* | Feather meal (L) | 4.19157 | 0.504191 | 8.3135 | 0.003647* | Feather meal (Q) | −4.54622 | 0.565214 | −8.0434 | 0.004013* | pH (L) | −1.39211 | 0.504191 | −2.7611 | 0.070089* | pH (Q) | −9.68345 | 0.565214 | −17.1324 | 0.000433* | Feather meal × pH | 1.25000 | 0.711972 | 1.7557 | 0.177405 |
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*Significant factors, .
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