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Table 2 Factor and levels L9 (34) of orthogonal design test

From: Isolation and identification of a feather degrading Bacillus tropicus strain Gxun-17 from marine environment and its enzyme characteristics

Levels A
Maltose concentration (g/L)
B
Feather concentration (g/L)
C
Initial pH
D
MgSO4 concentration (g/L)
1 5 20 7.0 0.05
2 0 25 7.5 0.10
3 10 15 8.0 0.15