Table 1 Factors and levels of the L9 (34) orthogonal experiment.

From: Cost-effective fibrinolytic enzyme production by Bacillus subtilis WR350 using medium supplemented with corn steep powder and sucrose

Parameters

Levels

1

2

3

A (Blank)

/

/

/

B (Sucrose)

25

35

45

C (CSP)

10

20

30

D (MgSO4·7H2O)

2

3

4