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Table 1 Selected variables and their levels for 25 factorial design

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

Variables

Code

Units

Range and levels

− 1

+ 1

A

pH

–

7.0

8.0

B

Temperature

°C

37

42

C

Moisture

%

90

100

D

Starch

%

0.5

1

E

Yeast extract

%

0.1

0.5