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Based on a bifurcation analysis of a process it is possible to point out where there might be operational problems due to change of stability of the process. One such change is investigated, Fold bifurcations. This type of bifurcation is associated with hysteresis/multiple steady states, which complicates operation close to these bifurcations. Typically only one of the steady states is interesting...
Global gene expression was analyzed in Saccharomyces cerevisiae T2 cells grown in the presence of hardwood spent sulphite liquor (HW SSL) and each of the three main inhibitors in HW SSL, acetic acid, hydroxymethyfurfural (HMF) and furfural, using a S. cerevisiae DNA oligonucleotide microarray. The objective was to compare the gene expression profiles of T2 cells in response to the individual inhibitors...
At present, ethanol production from lignocellulosic biomass is the most widely used. Banana is extensive planted in the south of China and its stalks contain 63.8 ?? 0.5% (of dry materials) dissolved carbohydrates that can be degraded into pentose and/or hexoses, which can be suitable for bio-ethanol fermentation by yeast. The technics of the simultaneous sacchrification and fermentation was adopted...
Two kinds of physical methods, vacuum evaporation and steam stripping, combined with overliming (calcium hydroxide) were applied to remove inhibitors which were produced simultaneously during the pretreatment of lignocellulosic biomass. Corn stover was steam exploded; the filtrate was hydrolyzed with dilute sulfuric acid. The acid hydrolyzate was then detoxified and fermented by yeast. Physical methods...
The activation effect of baker's yeast Saccharomyces cerevisiae autolysis was examined under standard conditions with addition of certain compounds: organic acids, vitamins, sugars, inorganic salts, ethanol, and their mixtures. The efficiency of autolysis in the presence of mixed activators (glucose/ethanol/sodium chloride in the concentration of 0.5/1.0/1% by wt.), increased by 50%, or by 80% when...
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