Abstract
The rate and extent of xylan utilization and the specific activities of extracellular polysaccharide-degrading enzymes formed byRuminococcus flavefaciens FD1 were increased by cocultivation withMethanobrevibacter smithii PS. As a consequence of interspecies hydrogen transfer interactions, the fermentation became acetogenic; methane, not hydrogen, was formed, less succinate was produced, and formate did not accumulate in the coculture. Accumulation of xylobiose and xylose released during xylanolysis was transient in the methanogenic coculture. The interaction ofR. flavefaciens and the hydrogen-utilizing acetogenAcetitomaculum ruminis also resulted in an acetogenic fermentation, higher polysaccharolytic enzyme activities, and increased xylan utilization; the effects of cocultivation ofR. flavefaciens withEubacterium limosum were not so pronounced.
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