Speciation-Dependent Molecular Mechanism of Electron Transfer from the c-Type Cytochrome MtrC to U(VI)-Ligand Complexes

Chemistry, Inorganic Chemistry, Environmental Chemistry, Earth Sciences, Geochemistry, Life Sciences, Microbiology,
c-type cytochrome   electron transfer   reduction kinetics   NMR   HR-XANES  

Uranium (U) is a radioactive element widely present in the environment, primarily existing in its hexavalent (U(VI)) and tetravalent (U(IV)) oxidation states. Under oxidizing conditions, U(VI) is the dominant stable form, while under reducing conditions, U(VI) can be reduced to U(IV). This reduction process can occur through abiotic pathways (e.g.,...

Factors Influencing the Efficacy of Microbial Remediation of Selenium in Groundwater Near a Coal-Fired Power Plant

Chemistry, Environmental Chemistry, Earth Sciences, Geochemistry, Engineering, Environmental Engineering, Life Sciences, Microbiology,
selenium reduction   groundwater remediation   microbial community analysis   denitrification   fly ash disposal  

Selenium (Selenium) is an essential trace element widely found in nature and involved in various biological metabolic processes. However, when selenium concentrations are too high, they can cause severe toxic effects on humans, animals, and the environment. Industrial activities, especially coal combustion in coal-fired power plants, are one of the...

Microbial Extracellular Polymeric Substances (EPS) in Soil: From Interfacial Behaviour to Ecological Multifunctionality

Chemistry, Environmental Chemistry, Earth Sciences, Geochemistry, Life Sciences, Microbiology,
extracellular polymeric substances   soil health   ecological functions   soil aggregates   interfacial reactions  

Soil is the product of terrestrial biogeochemical processes and an essential foundation for human survival. Microorganisms endow soil with life properties and drive the biogeochemical cycles within it. Microorganisms play a crucial role in improving soil structure, enhancing fertility, controlling pollution, and responding to global climate change....

Influence of Crystal Shape and Orientation on the Magnetic Microstructure of Bullet-Shaped Magnetosomes Synthesized by Magnetotactic Bacteria

Chemistry, Nanoscience, Inorganic Chemistry, Materials Chemistry, Materials Science, Life Sciences, Microbiology,
Magnetotactic bacteria   Magnetosomes   Crystal shape   Magnetic anisotropy   Off-axis electron holography   Magnetite   Nanocrystals  

Magnetotactic Bacteria (MTB) are a group of microorganisms capable of biomineralizing magnetosomes. Magnetosomes are membrane-bound magnetic nanocrystals primarily composed of magnetite (Fe₃O₄) or greigite (Fe₃S₄). These magnetosomes are arranged in chains or specific orientations within bacterial cells, endowing the bacteria with a magnetic dipole...

Magnetite Nanoparticles as Metastable Biogeobatteries in Consecutive Redox Cycles

Chemistry, Nanoscience, Environmental Chemistry, Earth Sciences, Geochemistry, Life Sciences, Microbiology,
magnetite   nanoparticles   redox   dissolution   biogeobattery  

Iron (Fe) is one of the most abundant elements on Earth, widely present in soils and sediments, and participates in global carbon, nitrogen, and oxygen cycles. The redox reactions of iron play a crucial role in biogeochemical cycles, particularly in the processes of iron oxidation and reduction. Iron minerals, especially mixed-valent iron minerals ...

Microbial Reduction of Fe(III)-Bearing Solids Recovered from Hydraulic Fracturing Flowback Water: Implications for Wastewater Treatment

Chemistry, Environmental Chemistry, Earth Sciences, Geochemistry, Engineering, Environmental Engineering, Life Sciences, Microbiology,
hydraulic fracturing   flowback water   microbial reduction   wastewater treatment   Fe(III)-bearing solids  

Hydraulic fracturing is a technique used to extract natural gas from unconventional reservoirs, but it generates large volumes of flowback and produced water. These waters contain complex mixtures of organic and inorganic constituents, particularly the solids associated with these fluids, which are often rich in iron (Fe), toxic organics, heavy met...