1 Section: Biofuels and Environmental Biotechnology H 2 synthesis from pentoses and biomass in Thermotoga spp. Niels T. Eriksen*, Martin Leegaard Riis, Nikolaj Kyndby Holm, Niels Iversen Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Sohngaardsholmsvej 49, DK-9000 Aalborg, Denmark *Corresponding author: Niels T. Eriksen Fax: + 45 98 14 18 08 E-mail: nte@bio.aau.dk