However, p-values indicated that inoculum rate of
T.harzianum (X2) and S.cerevisiae (X3) and aeration (X4) were not
significant factors whereas some of their interactions were significant,
thus removing nonsignificant factors from the model were
not hierarchical. Since, optimization of five factors would be very
difficult in practice, factors were evaluated by examining the variety
of graphs (Fig. 1) in order to find if some of them could be fixed
or not. Examining these graphs, it was observed that low inoculation rate of A.sojae led to higher bioethanol concentration
than high inoculation rate when the inoculation rates of T.harzianum
and S.cerevisiae were fixed at their low levels, agitation speed
was high and the vented flasks were used (Fig. 1a). Agitation speed
was an important factor for bioethanol production. The higher the
agitation speed the higher was the bioethanol production (Fig. 1b).
However, p-values indicated that inoculum rate ofT.harzianum (X2) and S.cerevisiae (X3) and aeration (X4) were notsignificant factors whereas some of their interactions were significant,thus removing nonsignificant factors from the model werenot hierarchical. Since, optimization of five factors would be verydifficult in practice, factors were evaluated by examining the varietyof graphs (Fig. 1) in order to find if some of them could be fixedor not. Examining these graphs, it was observed that low inoculation rate of A.sojae led to higher bioethanol concentrationthan high inoculation rate when the inoculation rates of T.harzianumand S.cerevisiae were fixed at their low levels, agitation speedwas high and the vented flasks were used (Fig. 1a). Agitation speedwas an important factor for bioethanol production. The higher theagitation speed the higher was the bioethanol production (Fig. 1b).
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