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Table 4 Independent variables with their ranges and levels for CCD of RSM

From: Goat dung as a feedstock for hyper-production of amylase from Glutamicibacter arilaitensis strain ALA4

Variables

Code

Range and levels

− α

− 1

0

+ 1

+ α

Temperature (°C)

A

37

40

42

45

50

Moisture (%)

B

80

90

100

110

120

Starch (%)

C

0.3

0.5

1

1.5

2

Yeast extract (%)

D

0.1

0.3

0.5

1

1.5