Non-aceticlastic methanogenesis from acetate: acetate oxidation by a thermophilic syntrophic coculture

Zinder, Stephen H.; Koch, Markus

doi:10.1007/bf00402133

Cited by 354 publications

(220 citation statements)

References 49 publications

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“…In this case, acetate was converted within 36 days. Although slow growth of strain TMO T on acetate was observed, these results are in agreement with those for previously described acetate-degrading bacteria that are either thermophilic or mesophilic and coupled to a methanogenic partner or an electron acceptor (Zinder & Koch, 1984 ;Schnu$ rer et al, 1996 ;Hattori et al, 2000).…”

Section: Growth On Acetatesupporting

confidence: 91%

Thermotoga lettingae sp. nov., a novel thermophilic, methanol-degrading bacterium isolated from a thermophilic anaerobic reactor.

Balk¹,

Weijma²,

Stams³

2002

International Journal of Systematic and Evolutionary Microbiology

101

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Section: Growth On Acetatesupporting

confidence: 91%

Thermotoga lettingae sp. nov., a novel thermophilic, methanol-degrading bacterium isolated from a thermophilic anaerobic reactor.

Balk¹,

Weijma²,

Stams³

2002

International Journal of Systematic and Evolutionary Microbiology

101

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“…The conversion of acetate to methane probably begins with the oxidation of acetate to H 2 and CO 2 in a first step and ends with the reduction of CO 2 to CH 4 using H 2 . This mechanism was observed by Zinder and Koch (1984) in a thermophilic coculture of two rods fed with an acetate-containing medium, of which only one was a methanogenic organism.…”

Section: Hystoliticum)mentioning

confidence: 87%

Morphological observation and microbial population dynamics in anaerobic polyurethane foam biofilm degrading gelatin

Tommaso

Varesche

Zaiat

et al. 2002

Braz. J. Chem. Eng.

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-This work reports on a preliminary study of anaerobic degradation of gelatin with emphasis on the development of the proteolytic biofilm in polyurethane foam matrices in differential reactors. The evolution of the biofilm was observed during 22 days by optical and scanning electron microscopy (SEM) analyses. Three distinct immobilization patterns could be observed in the polyurethane foam: cell aggregates entrapped in matrix pores, thin biofilms attached to inner polyurethane foam surfaces and individual cells that have adhered to the support. Rods, cocci and vibrios were observed as the predominant morphologies of bacterial cells. Methane was produced mainly by hydrogenothrophic reactions during the operation of the reactors.

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“…To which extent syntrophic acetate oxidation or homoacetogenic fermentation really occurred in our reactors remains open. So far, syntrophic acetate oxidation has been documented to dominate acetate metabolism at enhanced temperature (≥55°C; (Zinder and Koch 1984)) or in the presence of ammonia at a high concentration which obviously inhibits aceticlastic methanogenesis (Schnürer et al 1994). Since ammonia concentrations in our biogas reactors were comparably high, especially in the ill-performing biogas reactor 2, syntrophic acetate oxidation may indeed contribute to acetate metabolism also in this reactor.…”

Section: Discussionmentioning

confidence: 77%

Biogas process parameters—energetics and kinetics of secondary fermentations in methanogenic biomass degradation

Montag

Schink

2015

Appl Microbiol Biotechnol

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Pool sizes of short-chain fatty acids (formate, acetate, propionate, and butyrate), hydrogen, and carbon monoxide were assayed in digesting sludge from four different methanogenic reactors degrading either sewage sludge or agricultural products and wastes at pH 8.0 and 40 or 47°C. Free reaction energies were calculated for the respective degradation reactions involved, indicating that acetate, propionate, and butyrate degradation all supplied sufficient energy (−10 to −30 kJ per mol reaction) to sustain the microbial communities involved in the respective processes. Pools of formate and hydrogen were energetically equivalent as electron carriers. In the sewage sludge reactor, homoacetogenic acetate formation from H 2 and CO 2 was energetically feasible whereas syntrophic acetate oxidation appeared to be possible in two biogas reactors, one operating at enhanced ammonia content (4.5 g NH 4 + -N per l) and the other one at enhanced temperature (47°C). Maximum capacities for production of methanogenic substrates did not exceed the consumption capacities by hydrogenotrophic and aceticlastic methanogens. Nonetheless, the capacity for acetate degradation appeared to be a limiting factor especially in the reactor operating at enhanced ammonia concentration.

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Non-aceticlastic methanogenesis from acetate: acetate oxidation by a thermophilic syntrophic coculture

Cited by 354 publications

References 49 publications

Thermotoga lettingae sp. nov., a novel thermophilic, methanol-degrading bacterium isolated from a thermophilic anaerobic reactor.

Thermotoga lettingae sp. nov., a novel thermophilic, methanol-degrading bacterium isolated from a thermophilic anaerobic reactor.

Morphological observation and microbial population dynamics in anaerobic polyurethane foam biofilm degrading gelatin

Biogas process parameters—energetics and kinetics of secondary fermentations in methanogenic biomass degradation

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