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Methane-dependent denitrification links the global nitrogen and methane cycles. Since its initial discovery in 2006, this process has been understood to involve a division of labor between an archaeal group and a bacterial group, which sequentially perform nitrate and nitrite reduction, respectively. Yao et al. have now revised this paradigm by identifying a Methylomirabilis bacterium capable of performing methane-dependent complete denitrification on its own.
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http://dx.doi.org/10.1016/j.tim.2024.03.007 | DOI Listing |
Water Res
August 2025
The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325035, PR China. Electronic address:
Constructed wetlands (CWs) face dual challenges of arsenic contamination and greenhouse gas (GHG) emissions, particularly concerning the competing processes of As(III) immobilization and methane-dependent As(V) reduction (AOM-AsR). To address this dilemma, we developed a novel microbial-nitrate-zero valent iron/manganese synergy (MNZS) system that establishes dynamic redox gradients through Fe/Mn-mediated electron flux regulation. The MNZS mechanism leverages zero valent iron/manganese (ZVI/ZVM) oxidation to create oxygen-depleted microzones, generating bioavailable Fe(II)/Mn(II) species while initiating microbial nitrate-reducing-coupled Fe(II)/Mn(II) oxidation (NRFO/NRMO).
View Article and Find Full Text PDFEnviron Sci Technol
May 2025
State Key Laboratory of Soil Pollution Control and Safety, Zhejiang University, Hangzhou 310058, China.
Iron is indispensable for literally all microorganisms, yet becomes toxic at elevated levels. Protein-based iron storage compartments, such as ferritins, play a key role in maintaining iron homeostasis when the iron level surpasses microbial requirements. However, the energy-intensive nature of iron storage raises questions about how microbes balance this bioprocess between growth and metabolism.
View Article and Find Full Text PDFChemosphere
November 2024
School of Civil Engineering, Wuhan University, Wuhan, 430072, China.
The anaerobic ammonia oxidation (anammox) process is a pivotal nitrogen removal technique, playing a significant role in the field of wastewater treatment. The paper commences by delineating the merits of the anammox process in comparison to conventional nitrification-denitrification techniques. Subsequently, it delves into the characteristics of different sludge morphologies process of the behavior of anammox bacteria and their reactions to environmental factors.
View Article and Find Full Text PDFTrends Microbiol
November 2024
Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, 310058 Hangzhou, China; College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laborato
Methane-dependent complete denitrification primarily involves nitrate reduction to nitrite by ANME-2d archaea and nitrite reduction to dinitrogen by Methylomirabilis bacteria. 'Candidatus Methylomirabilis sinica' integrates the divisional labor. Physiological traits of this bacterium potentially enable the simultaneous reduction of NO and CH emissions.
View Article and Find Full Text PDFTrends Microbiol
June 2024
Australian Centre for Water and Environmental Biotechnology, The University of Queensland, St Lucia, Queensland 4072, Australia. Electronic address:
Methane-dependent denitrification links the global nitrogen and methane cycles. Since its initial discovery in 2006, this process has been understood to involve a division of labor between an archaeal group and a bacterial group, which sequentially perform nitrate and nitrite reduction, respectively. Yao et al.
View Article and Find Full Text PDF