Taxonomy and ecology of methanogens

The effect of low pressure and mixing on biological hydrogen production via anaerobic fermentation

“…Acetogens use the central intermediates to produce acetate, formate, carbon dioxide and hydrogen. Syntrophic methanogens keep acetate and hydrogen levels from accumulating and inhibiting fermentation [5,6]. A simplified diagram of these processes in a batch reactor is shown in Fig.…”

Comparison of Methane Emission from Conventional and Modified Paddy Cultivation in Malaysia

“…In the other words, irrigation pattern in MCs aerated the soil in intervals and thus, affected the activity of methanogens. As methanogens are anaerobic unicellular organisms (Garcia, 1990) they are more active under flooding condition rather than dry condition (Watanabe et al, 2009) therefore, draining the soil in MCs decline the methane emission (Neue et al, 1996;Tyagi et al, 2010;Khosa et al, 2011;Zhang et al, 2011). Accordingly, MCs had a regulating effect on seasonal methane emission (SME) compared to C (Fig.…”

Amino Acid and Peptide Utilization Profiles of the Fluoroacetate-Degrading Bacterium Synergistetes Strain MFA1 Under Varying Conditions

“…Co-cultivation with a hydrogen-scavenging methanogen in the absence of fluoroacetate showed that the growth of strain MFA1 can be enhanced when fermentative hydrogen is removed by the methanogen. Many methanogenic archaea, including M. smithii, derive their energy from autotrophic growth through the coupling of hydrogen oxidation to carbon dioxide reduction, leading to exclusive production of methane [30]. Accordingly, previous studies have estimated the growth of methanogens in batch culture from the accumulation of methane in the system [30][31][32][33].…”

“…Many methanogenic archaea, including M. smithii, derive their energy from autotrophic growth through the coupling of hydrogen oxidation to carbon dioxide reduction, leading to exclusive production of methane [30]. Accordingly, previous studies have estimated the growth of methanogens in batch culture from the accumulation of methane in the system [30][31][32][33]. The final growth of M. smithii in co-culture with strain MFA1 in basal yeast extract medium was predicted to be relatively similar to the pure M. smithii culture at an OD (600 nm) of approximately 0.05 based on the comparable methane gas production by the methanogen in pure and co-culture.…”