Appl Environ Microbiol 2020 Oct 15;86(21). Epub 2020 Oct 15.
University of Tennessee, Knoxville, Tennessee, USA.
Environ Sci Process Impacts 2021 Sep 13. Epub 2021 Sep 13.
Department of Civil and Environmental Engineering, University of Iowa, Iowa City, Iowa 52242, USA.
Abiotic reduction of nitrite (NO) by Fe(II) species (, chemodenitrification) has been demonstrated in a variety of natural environments and laboratory studies, and is a potentially significant source of atmospheric nitrous oxide (NO) emissions. It is, however, unclear how chemodenitrification rates and NO yields vary among heterogeneous Fe(II) species under similar conditions and whether abiotic reduction competes with biological NO reduction. Here, we measured rates of NO reduction and extents of NO production by several Fe(II) species under consistent, environmentally relevant conditions (, pH 7. Read More
Antonie Van Leeuwenhoek 2021 Sep 7. Epub 2021 Sep 7.
Section for Microbiology, Center for Electromicrobiology, Department of Biology, Aarhus University, Ny Munkegade 114, Building 1540, 8000, Aarhus C, Denmark.
Microaerophilic veils of swimming microorganisms form at oxic-anoxic interfaces, mostly described in sediments where sulfide from below meets oxygen diffusing in from the water phase. However, microaerophilic veils form even when these gradients do not overlap, for example when cable bacteria activity leads to a suboxic zone. This suggests that veil microorganisms can use electron donors other than sulfide. Read More
Environ Sci Pollut Res Int 2021 Sep 5. Epub 2021 Sep 5.
University of Kalyani, Kalyani, West Bengal, 741235, India.
Biogeochemical release of soil-bound arsenic (As) governs mobilization of the toxic metalloid into the groundwater. The present study has examined As-reduction ability of bacteria from anoxic aquatic sediments that might contribute to arsenic mobilization in the Bengal Delta. Arsenic-reducing bacteria from deep layers of pond sediment were enriched and isolated in anaerobic environments and As reduction was assessed in culture medium. Read More
Sci Total Environ 2021 Aug 24;802:149855. Epub 2021 Aug 24.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China.
In order to realize the active and synchronous control of nitrogen (N) and organic matter (OM) release from sediments, this study compared the spatiotemporal changes in the physical, chemical, and biological indicators in the water system under different CaO dosing modes. Results from 90-day incubation experiment showed that CaO formed a dense barrier layer near its dosing position, improved the anoxic condition of water system, increased the physical adsorption of pollutants by sediments, and reduced the nutrients in overlying water, interstitial water, and sediments. Comprehensive comparison, the improvement effect of shallow injection group (I1) was the most obvious. Read More
Glob Chang Biol 2021 Aug 28. Epub 2021 Aug 28.
Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China.
Ocean acidification in nitrogen-enriched estuaries has raised global concerns. For decades, biotic and abiotic denitrification in estuarine sediments has been regarded as the major ways to remove reactive nitrogen, but they occur at the expense of releasing greenhouse gas nitrous oxide (N O). However, how these pathways respond to acidification remains poorly understood. Read More