[Conversion of acetic acid to methane by thermophiles]

Zinder, S H

doi:10.2172/6546630

Cited by 9 publications

(13 citation statements)

References 26 publications

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“…contributed significantly to the relief from the high acetate concentration. This is supported by the previous findings that Methanosarcina primarily converts acetate to methane at an acetate concentration higher than 1 mmol liter Ϫ1 (22,55). Another genus of aceticlastic methanogen, Methanosaeta, which grew favorably at acetate concentrations lower than 1 mmol liter Ϫ1 , could not be detected throughout the operation.…”

Section: Discussionsupporting

confidence: 77%

Dynamic Transition of a Methanogenic Population in Response to the Concentration of Volatile Fatty Acids in a Thermophilic Anaerobic Digester

Hori

Haruta

Ueno

et al. 2006

Appl Environ Microbiol

281

131

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In this study, the microbial community succession in a thermophilic methanogenic bioreactor under deteriorative and stable conditions that were induced by acidification and neutralization, respectively, was investigated using PCR-mediated single-strand conformation polymorphism (SSCP) based on the 16S rRNA gene, quantitative PCR, and fluorescence in situ hybridization (FISH). The SSCP analysis indicated that the archaeal community structure was closely correlated with the volatile fatty acid (VFA) concentration, while the bacterial population was impacted by pH. The archaeal community consisted mainly of two species of hydrogenotrophic methanogen (i.e., a Methanoculleus sp. and a Methanothermobacter sp.) and one species of aceticlastic methanogen (i.e., a Methanosarcina sp.). The quantitative PCR of the 16S rRNA gene from each methanogen revealed that the Methanoculleus sp. predominated among the methanogens during operation under stable conditions in the absence of VFAs. Accumulation of VFAs induced a dynamic transition of hydrogenotrophic methanogens, and in particular, a drastic change (i.e., an approximately 10,000-fold increase) in the amount of the 16S rRNA gene from the Methanothermobacter sp. The predominance of the one species of hydrogenotrophic methanogen was replaced by that of the other in response to the VFA concentration, suggesting that the dissolved hydrogen concentration played a decisive role in the predominance. The hydrogenotrophic methanogens existed close to bacteria in aggregates, and a transition of the associated bacteria was also observed by FISH analyses. The degradation of acetate accumulated during operation under deteriorative conditions was concomitant with the selective proliferation of the Methanosarcina sp., indicating effective acetate degradation by the aceticlastic methanogen. The simple methanogenic population in the thermophilic anaerobic digester significantly responded to the environmental conditions, especially to the concentration of VFAs.

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Section: Discussionsupporting

confidence: 77%

Dynamic Transition of a Methanogenic Population in Response to the Concentration of Volatile Fatty Acids in a Thermophilic Anaerobic Digester

Hori

Haruta

Ueno

et al. 2006

Appl Environ Microbiol

281

131

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“…Methanogenesis from acetate is primarily influenced by the acetate availability (Zinder et al 1990), pH, temperature, salinity (van den Berg et al 1976, redox potential (Rieger et al 2006), sulfide, and ammonium concentrations (Chen 2008). All the columns were operated at suitable temperatures as well as under appropriate pH and salinity conditions for methanogenesis (van den Berg et al 1976, Zinder et al 1990).…”

Section: Methanogenic Activity At 25 °C After Depletion Of Sulfatementioning

confidence: 99%

“…All the columns were operated at suitable temperatures as well as under appropriate pH and salinity conditions for methanogenesis (van den Berg et al 1976, Zinder et al 1990). …”

Section: Methanogenic Activity At 25 °C After Depletion Of Sulfatementioning

confidence: 99%

Aquifer heat storage: abundance and diversity of the microbial community with acetate at increased temperatures

et al. 2017

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“…Methanosaeta utilize exclusively acetate while Methanosarcina can grow on several substrates other than acetate. The former methanogens have a low growth rate but high affinity for acetate 81) . Thus, the growth of aceticlastic methanogens is affected by the concentration of acetate.…”

Section: Ecology Of the Syntrophic Acetate-oxidizing Bacteriamentioning

confidence: 99%

Syntrophic Acetate-Oxidizing Microbes in Methanogenic Environments

2008

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Acetate is one of the most important intermediates for methanogenesis in the anaerobic mineralization of organic materials. Methanogenic acetate degradation is carried out by either an aceticlastic reaction or an anaerobic acetateoxidizing reaction. In contrast to the former reaction, the latter is energetically extremely unfavorable. However, the oxidation of acetate can occur with syntrophic interaction between certain bacteria and methanogenic archaea. The bacteria, namely syntrophic acetate-oxidizing bacteria, can oxidize acetate to produce hydrogen/CO2 only when their products are subsequently utilized by the hydrogen-scavenging methanogens. Surprisingly, some of these bacteria can also axenically grow on hydrogen/CO2 to produce acetate. This means that the bacteria can utilize both substrates and products reversibly. This review describes current studies of these curious and fascinating microbes.

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[Conversion of acetic acid to methane by thermophiles]

Cited by 9 publications

References 26 publications

Dynamic Transition of a Methanogenic Population in Response to the Concentration of Volatile Fatty Acids in a Thermophilic Anaerobic Digester

Dynamic Transition of a Methanogenic Population in Response to the Concentration of Volatile Fatty Acids in a Thermophilic Anaerobic Digester

Aquifer heat storage: abundance and diversity of the microbial community with acetate at increased temperatures

Syntrophic Acetate-Oxidizing Microbes in Methanogenic Environments

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