Methanogenesis is an ancient metabolism that originated on the early anoxic Earth. The buildup of O(2) about 2.4 billion years ago led to formation of a large oceanic sulfate pool, the onset of widespread sulfate reduction and the marginalization of methanogens to anoxic and sulfate-poor niches. Contemporary methanogens are restricted to anaerobic habitats and may have retained some metabolic relics that were common in early anaerobic life. Consistent with this hypothesis, methanogens do not utilize sulfate as a sulfur source, Cys is not utilized as a sulfur donor for Fe-S cluster and Met biosynthesis, and Cys biosynthesis uses an unusual tRNA-dependent pathway.
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The characteristics of intestinal flora of Tibetan sheep in different regions at high altitude were revealed based on metagenomic technique.
Heliyon
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College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai, 810016, China.
Tibetan sheep play a vital role in the livelihoods of herders and are an important part of the ecosystem of the Tibetan Plateau. In order to study the characteristics of the gut microorganisms of Tibetan sheep at high altitude, this study employed macrogenomic techniques to analyse the diversity and differences in the gut flora of Tibetan sheep in different regions of high altitude and high cold. The results demonstrated that at the phylum level, the dominant phylum in the ileo-cecum segment of Tibetan sheep in Qilian, Henan and Gonghe counties was identical, namely , and .
View Article and Find Full Text PDFChanges in methanogenic performance and microbial community during gradual transition from co-digestion with food waste to mono-digestion of rice straw.
Bioresour Technol
January 2025
Department of Frontier Science for Advanced Environment, Graduate School of Environmental Sciences, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan; Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan. Electronic address:
This study investigated the performance and phase-specific characteristics of mesophilic co-digestion of food waste (FW) with rice straw (RS) at different RS proportions (40 %, 60 %, and 80 %), as well as mono-digestion of RS. The system achieved optimal performance at 40 % RS content, with a methane yield of 383.8 mL/g-VS and cellulose removal efficiency exceeding 75 %.
View Article and Find Full Text PDF[Small intestine bacterial overgrowth: Myths and realities].
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January 2025
Medicina Familiar y Comunitaria, Centro de Salud Los Ángeles, Madrid; Grupo de trabajo de Patología digestiva y hepática de la semFYC; Grupo de trabajo de Digestivo de la SoMaMFyC, España.
The small intestine bacterial overgrowth (SIBO) is a clinical disorder resulting from colonization of the small intestine by an excessive number of microorganisms or by unusual microorganisms. When they are methane producers it is called intestinal methanogen overgroth (IMO). Known risk factors are congenital or acquired anatomical alterations, motility alterations, some systemic and autoimmune diseases, those that cause alterations in biliopancreatic secretions, hypochlorhydria and some drugs.
View Article and Find Full Text PDFCollaborative or competitive interactions between bacteria and methanogens on the biocorrosion of Q235A steel.
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Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Key Laboratory for Chemical Biology of Fujian Province, Xiamen University, Xiamen, China. Electronic address:
Bio-corrosion of Fe (0) metals in the actual environments results from the combined action of multiple microbes rather than the single action of one type of microbe. Nevertheless, the interspecies interactions between the corrosive microorganism and co-existing microbes, as well as their effects on the bio-corrosion of Fe (0) metals, remain unclear, especially for the interspecies interactions between methanogens and co-existed bacteria in microbiota in the absence of sulfate. Herein, the interspecies interactions between methanogens and co-existed bacteria in three different kinds of methanogenic microbiota (Methanothrix, Methanospirillum, or Methanobacterium dominant) and their effects on methanogens-influenced corrosion of Q235A steel were investigated.
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Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs / Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA / Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin, 300191, PR China. Electronic address:
As an accelerated electron transfer device, the influence of microbial electrochemical snorkel (MES) on soil greenhouse gas production remains unclear. Electron transport is the key to methane production and denitrification. We found that the NO amount of the MES treatment was comparable to the control however the cumulative CO and CH emissions were reduced by 50% and 41%, respectively.
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