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methane

  • Molecular Evidence for an Active Microbial Methane Cycle in Subsurface Serpentinite-Hosted Groundwaters in the Samail Ophiolite, Oman
    Geomicrobiology
    Molecular Evidence for an Active Microbial Methane Cycle in Subsurface Serpentinite-Hosted Groundwaters in the Samail Ophiolite, Oman

    Serpentinization of ultramafic rock can generate conditions favorable for microbial methane (CH4) cycling, including the abiotic production of hydrogen (H2) and possibly CH4. Systems of low-temperature serpentinization are geobiological targets due to their potential to harbor microbial life and ubiquity throughout Earth’s history. Biomass in fracture waters collected from the Samail Ophiolite of Oman, a...

    Emily A. Kraus, Daniel Nothaft, Blake W. Stamps, Kaitlin R. Rempfert, Eric T. Ellison, Juerg M. Matter, Alexis S. Templeton, Eric S. Boyd, John R. Spear
  • Open Access
    Large Hydrogen Isotope Fractionation Distinguishes Nitrogenase-Derived Methane from Other Methane Sources
    Geomicrobiology | Spotlight
    Large Hydrogen Isotope Fractionation Distinguishes Nitrogenase-Derived Methane from Other Methane Sources

    All forms of life require nitrogen for growth. Many different kinds of microbes living in diverse environments make inert nitrogen gas from the atmosphere bioavailable using a special enzyme, nitrogenase. Nitrogenase has a wide substrate range, and, in addition to producing bioavailable nitrogen, some forms of nitrogenase also produce small amounts of the greenhouse gas methane. This is different from other microbes that produce methane...

    Katja E. Luxem, William D. Leavitt, Xinning Zhang
  • Open Access
    Methanol Production by “<em>Methylacidiphilum fumariolicum</em>” SolV under Different Growth Conditions
    Biotechnology
    Methanol Production by “Methylacidiphilum fumariolicum” SolV under Different Growth Conditions

    The production of methanol, an important chemical, is completely dependent on natural gas. The current multistep chemical process uses high temperature and pressure to convert methane in natural gas to methanol. In this study, we used the methanotroph “Methylacidiphilum fumariolicum” SolV to achieve continuous methanol production from methane as the substrate. The production rate was highly dependent on the growth rate of this...

    Carmen Hogendoorn, Arjan Pol, Guylaine H. L. Nuijten, Huub J. M. Op den Camp
  • Semiquantitative Detection of Hydrogen-Associated or Hydrogen-Free Electron Transfer within Methanogenic Biofilm of Microbial Electrosynthesis
    Biotechnology
    Semiquantitative Detection of Hydrogen-Associated or Hydrogen-Free Electron Transfer within Methanogenic Biofilm of Microbial Electrosynthesis

    Electron transfer from an electrode to biofilm is of great interest to the fields of microbial electrochemical technology, bioremediation, and methanogenesis. It has a promising potential application to boost more value-added products or pollutant degradation. Importantly, the ability of microbes to obtain electrons from electrodes and utilize them brings new insight into direct interspecies electron transfer during methanogenesis....

    Weiwei Cai, Wenzong Liu, Bo Wang, Hong Yao, Awoke Guadie, Aijie Wang
  • Influence of Energy and Electron Availability on <em>In Vivo</em> Methane and Hydrogen Production by a Variant Molybdenum Nitrogenase
    Physiology
    Influence of Energy and Electron Availability on In Vivo Methane and Hydrogen Production by a Variant Molybdenum Nitrogenase

    A variant form of Mo nitrogenase catalyzes the conversion of CO2 and protons to the biofuels CH4 and H2. A constant supply of electrons and ATP is needed to drive these reduction reactions. The bacterium R. palustris generates ATP from light and has a versatile metabolism that makes it ideal for manipulating electron availability...

    Yanning Zheng, Caroline S. Harwood
  • Interspecies Chemical Signaling in a Methane-Oxidizing Bacterial Community
    Environmental Microbiology
    Interspecies Chemical Signaling in a Methane-Oxidizing Bacterial Community

    Methanotrophs are bacteria that sequester methane, a significant greenhouse gas, and thereby perform an important ecosystem function. Understanding the mechanisms by which these organisms interact in the environment may ultimately allow us to manipulate and to optimize this activity. Here we show that members of a genus of methane-oxidizing bacteria can be influenced by a chemical signal produced by a possibly competing species. This...

    Aaron W. Puri, Darren Liu, Amy L. Schaefer, Zheng Yu, Mitchell W. Pesesky, E. Peter Greenberg, Mary E. Lidstrom
  • Changes in the Rumen Microbiota of Cows in Response to Dietary Supplementation with Nitrate, Linseed, and Saponin Alone or in Combination
    Microbial Ecology | Spotlight
    Changes in the Rumen Microbiota of Cows in Response to Dietary Supplementation with Nitrate, Linseed, and Saponin Alone or in Combination

    This study aimed at identifying the microbial mechanisms of enteric methane mitigation when linseed, nitrate, and saponins were fed to nonlactating cows alone or in a combination. Hydrogen is a limiting factor in rumen methanogenesis. We hypothesized that linseed and saponins would affect hydrogen producers and nitrate would affect hydrogen consumption, leading to reduced methane production in the rumen. Contrary to what was predicted,...

    Milka Popova, Jessie Guyader, Mathieu Silberberg, Ahmad Reza Seradj, Cristina Saro, Aurélien Bernard, Christine Gérard, Cécile Martin, Diego P. Morgavi
  • Biotechnology
    Spatial Distribution and Diverse Metabolic Functions of Lignocellulose-Degrading Uncultured Bacteria as Revealed by Genome-Centric Metagenomics

    This work contributes new knowledge about lignocellulose degradation in engineered ecosystems. Specifically, the combination of the spatial distribution of uncultured microbes with genome-centric metagenomics provides novel insights into the metabolic properties of planktonic and firmly attached to plant biomass bacteria. Moreover, the knowledge obtained in this study enabled us to understand the diverse metabolic strategies for...

    Panagiotis G. Kougias, Stefano Campanaro, Laura Treu, Panagiotis Tsapekos, Andrea Armani, Irini Angelidaki
  • Environmental Microbiology
    Targeting Bacteria and Methanogens To Understand the Role of Residual Slurry as an Inoculant in Stored Liquid Dairy Manure
    Jemaneh Habtewold, Robert Gordon, Vera Sokolov, Andrew VanderZaag, Claudia Wagner-Riddle, Kari Dunfield
  • Physiology
    Physiological Evidence for Isopotential Tunneling in the Electron Transport Chain of Methane-Producing Archaea
    Nikolas Duszenko, Nicole R. Buan

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