Statistical prediction of interactions between low concentrations of inhibitors on yeast cells responses added to the SD-medium at low pH values

Table 4 Analysis of variance (ANOVA) for the quadratic model analysis for ethanol production

	Degree of freedom (DF)	Sequential sum of squares	Adjusted means of square	F-value	P-values (probability)
Regression	9	1530.06	170.006	11.35	0.001
Linear	3	1072.07	122.088	8. 15	0.006
Square	3	392.06	130.686	8.72	0.005^b
Interaction	3	65.93	21,977	1.47	0.288
Residual error	9	134.83	14.981	–	–
Lack- of- fit	5	101,89	20.378	2.47	0.200
Pure error	4	32.94	8.234	–	–
Total	18	–	–	–	–

SD-medium containing initially 2% yeast extract, 18% glucose and 10 mg/mL of starting cells during fermentation periods of 6 h at 34 °C

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