초록
<P><B>Highlights</B></P><P>► This study focused on the anaerobic metabolism of cellulose by a thermophilic consortium. ► The consortium included <I>Thermoanaerobacter</I>, <I>Clostridium</I>, and <I>Acetivibrio</I> spp. ► The main fermentation products were H<SUB>2</SUB>, CO<SUB>2</SUB>, ethanol, and acetate formed at 50 or 60°C. ► ANOVA indicated significant interactions between the cellulose type and temperature. ► These interactions have not been previously recognized for cellulolytic microorganisms.</P> <P><B>Abstract</B></P><P>The purpose of this study was to characterize the effect of temperature and cellulosic substrates on fermentative metabolites, H<SUB>2</SUB> production, and community successions in an anaerobic, cellulolytic consortium, TC60. Pyrosequencing analysis indicated that the consortium was predominated by <I>Thermoanaerobacter</I> and <I>Clostridium</I> spp. Metabolite production was analyzed with four cellulosic substrates at 4kg/m<SUP>3</SUP>. Triplicate cultures of each substrate were incubated at 50 or 60°C. The main fermentation products (H<SUB>2</SUB>, CO<SUB>2</SUB>, ethanol, and acetate) were monitored over time. The ANOVA model for production rates showed a significant temperature effect (<I>P</I><0.05) on all products. Increased temperature promoted higher H<SUB>2</SUB>, CO<SUB>2</SUB>, and ethanol yields while acetate yields were only affected prior to 24h of incubation. In addition to individual effects discerned in the model, ANOVA indicated significant interactions between the substrate and temperature. These interactions have not been previously recognized in the literature for cellulolytic and hydrogen-producing microorganisms.</P>