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Table 1 Experimental design used in RSM and ANN studies by using six independent variables showing observed values of lipase activity

From: A modeling study by response surface methodology and artificial neural network on culture parameters optimization for thermostable lipase production from a newly isolated thermophilic Geobacillus sp. strain ARM

Temperature (°C)

Medium volume (ml)

Inoculum size (%)

Agitation rate (rpm)

Incubation period (h)

Initial pH

Lipase activity (Uml-1)

60

162.5

4

50

60

6

0.2063

60

162.5

2

150

36

8

0

60

87.5

4

50

60

8

0.0207

50

162.5

2

150

60

8

0

60

87.5

4

150

36

8

0

60

162.5

2

50

60

8

0.0291

60

87.5

2

150

36

6

0

50

87.5

4

50

36

8

0.0886

50

162.5

2

50

36

8

0.0724

50

87.5

4

150

60

8

0

50

162.5

4

150

60

6

0.0907

50

87.5

2

50

36

6

0.1945

45

125

3

100

48

7

0.04

65

125

3

100

48

7

0.0229

55

50

3

100

48

7

0.0457

55

200

3

100

48

7

0.0551

55

125

1

100

48

7

0

55

125

5

100

48

7

0.0841

55

125

3

0

48

7

0.0675

55

125

3

200

48

7

0

55

125

3

100

24

7

0.0851

55

125

3

100

72

7

0.0281

55

125

3

100

48

5

0

55

125

3

100

48

9

0

55

125

3

100

48

7

0.049

55

125

3

100

48

7

0.0475

55

125

3

100

48

7

0.046

55

125

3

100

48

7

0.0455

55

125

3

100

48

7

0.0445

60

162.5

4

150

36

6

0

50

162.5

4

50

36

6

0.0693

60

87.5

2

50

60

6

0.0792

50

87.5

2

150

60

6

0.0996

  1. ANN training set: normal and italic (center points) numbers
  2. ANN testing set: bold numbers