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Table 1 Experimental range and level of the independent variables

From: Improvement of antibiotic activity of Xenorhabdus bovienii by medium optimization using response surface methodology

Variable

Parameter

Range and level

  

-1.682

-1

0

1

1.682

X 1

Glycerol (g/L)

1.0

3.0

5.0

7.0

9.0

X 2

Soytone (g/L)

5.0

9.0

15.0

21.0

25.0

X 3

Minerals (g/L)

3.0

4.2

6.2

8.2

9.4

  1. x i = coded value of the variable X i .
  2. x1 = (Glucose - 5)/2; x2 = (Peptone - 15)/6; x3 = (Minerals - 6.2)/2.
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Microbial Cell Factories

ISSN: 1475-2859

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