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Table 1 Variables and their levels for the experimental central composite design (CCD)

From: Optimization of xylanase production by Streptomyces sp. P12-137 using response surface methodology and central composite design

 Variable

 Coded level of variable

−α

−1

0

+1

+α

Wheat bran (%,w/v)

0.80

1.00

1.50

2.00

2.20

KNO3 (%,w/v)

0.04

0.20

0.60

1.00

1.16

Xylose (%,w/v)

0.02

0.10

0.30

0.50

0.78

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Annals of Microbiology

ISSN: 1869-2044

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