Methanogens are obligate anaerobes in the phylum Euryarchaeota under domain archaea (Woese et al. 1990; Janssen and Kirs 2008; Wright and Klieve 2011; Zhou et al. 2011). These occur in large numbers ranging from 107 to
Methanogens are obligate anaerobes in the phylum Euryarchaeota under domain archaea (Woese et al. 1990; Janssen and Kirs 2008; Wright and Klieve 2011; Zhou et al. 2011). These occur in large numbers ranging from 107 to