The number of syntrophic butyrate-degrading bacteria in a flooded paddy field soil was 1.7 x 10(3) MPN/g dry soil. Butyrate was degraded to acetate and methane when paddy soils were incubated anaerobically with the addition of butyrate. However, butyrate degradation was completely suppressed by the addition of the specific inhibitor of methanogenesis, 2-bromoethanesulfonate (BES) to the soil. A...

The annual rate of CH4 release and potential CH4 production has recently been studied in the Salmisuo fen in eastern Finland but the microbiota responsible for the CH4 production has not been examined. The diversity of the methane producing Archaea was analysed, at different depths, in the most representative microsite (Eriophorum lawn) of the fen. Methanogen populations were studied using prim...

Knowledge of taxis (directed swimming) in the Archaea is currently expanding through identification of novel receptors, effectors, and proteins involved in signal transduction to the flagellar motor. Although the ability for biological cells to sense and swim toward hydrogen gas has been hypothesized for many years, this capacity has yet to be observed and demonstrated. Here we show that the av...

Optimization of the biogas generation process is important to achieve efficient degradation and high methane yield, reduce emissions from digestate. In this study, serial digester systems with two or three reactors were compared a single reactor, aim improving degree yield food waste assessing adaptation microbial communities different reactor steps. All had same total organic load (2.4 g VS/(L...

Abstract Mangroves are valuable ecosystems that facilitate primary production, carbon sequestration, and regulation of greenhouse gas (GHG) cycles in coastal sediments, with microorganisms playing key roles. Specialized bacteria archaea compete for energy resources mangrove sediments to inhabit optimal ecological niches can produce or consume methane (CH 4 )—a potent GHG—in the process. CH cycl...

The objective of this study was to evaluate the role of reductive acetogenesis as an alternative H2 disposal mechanism in the rumen. H2/CO2-supported acetogenic ruminal bacteria were enumerated by using a selective inhibitor of methanogenesis, 2-bromoethanesulfonic acid (BES). Acetogenic bacteria ranged in density from 2.5 x 10(5) cells/ml in beef cows fed a high-forage diet to 75 cells/ml in f...