title: Inhibitory effects of ferrihydrite on a thermophilic methanogenic community.
abstract: The addition of ferrihydrite to methanogenic microbial communities obtained from a thermophilic anaerobic digester suppressed methanogenesis in a dose-dependent manner. The amount of reducing equivalents consumed by the reduction of iron was significantly smaller than that expected from the decrease in the production of CH4, which suggested that competition between iron-reducing microorganisms and methanogens was not the most significant cause for the suppression of methanogenesis. Microbial community analyses revealed that the presence of ferrihydrite markedly affected the bacterial composition, but not the archaeal composition. These results indicate that the presence of ferrihydrite directly and indirectly suppresses thermophilic methanogenesis.
authors.affiliation: Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo.
authors.forename: Chihaya
authors.initials: C
authors.lastname: Yamada
authors.forename: Souichiro
authors.initials: S
authors.lastname: Kato
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Ueno
authors.forename: Masaharu
authors.initials: M
authors.lastname: Ishii
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Igarashi
mesh_terms: D000693:Anaerobiosis; D001105:Archaea / Q000187:drug effects* / Q000235:genetics; D001419:Bacteria / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D019641:DNA, Archaeal / Q000737:chemistry / Q000235:genetics; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D005290:Ferric Compounds / Q000494:pharmacology*; D006358:Hot Temperature; D007501:Iron / Q000378:metabolism; D008697:Methane / Q000378:metabolism*; D017013:Methanobacteriaceae / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D017020:Methanosarcina / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D012150:Polymorphism, Restriction Fragment Length; D019642:RNA, Archaeal / Q000737:chemistry / Q000235:genetics; D012329:RNA, Bacterial / Q000737:chemistry / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012722:Sewage / Q000382:microbiology
chemical_list: D019641:DNA, Archaeal; D004269:DNA, Bacterial; D005290:Ferric Compounds; D019642:RNA, Archaeal; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D012722:Sewage; C092844:ferric oxyhydroxide; D007501:Iron; D008697:Methane