Anaeobes that consumed methane (and me).
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Modeling the Performance of an Anaerobic Moving Bed Biofilm Reactor.
Biotechnol Bioeng
January 2025
Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, Arizona, USA.
Sub-models representing transformation processes by microorganisms and hydrolases, a one-dimensional (1-D) biofilm, and a bioreactor were integrated to simulate organic-matter fermentation and methane (CH) production in an anaerobic moving bed biofilm reactor (AnMBBR). The integrated models correctly represented all experimental observations and identified mechanisms underlying how and why AnMBBR performance changed when the volumetric loading rate (VLR) of total chemical oxygen demand (TCOD) increased from 3.9 to 19.
View Article and Find Full Text PDFMechanisms of removing terdizolamide phosphate from water by the activation of potassium peroxymonosulfate with CeFeO biochar.
Environ Sci Pollut Res Int
January 2025
School of Chemical Engineering, University of Science and Technology Liaoning, Anshan, 114051, PR China.
Terdizolamide phosphate (TZD), a second-generation oxazolidinone antibiotic with a long half-cycle, poses a potential threat to ecosystems and humans if present in water over an extended duration. Magnetic biochar (CF-biochar) loaded with CeFeO was firstly synthesized by microwave ablation-anaerobic carbonization using corn straw as raw material and Ce(NO) and Fe(NO) as modifiers. These modifiers were used as activators for peroxymonosulfate (PMS) and adsorbents for removing TZD.
View Article and Find Full Text PDFAdvances and insights into modeling extracellular electron transfer in anaerobic bioprocesses.
Sci Total Environ
January 2025
Department of Environmental Health and Engineering, Johns Hopkins University, 3400 N Charles St, Baltimore, MD 21218, United States. Electronic address:
Extracellular electron transfer (EET) plays an important role in maintaining redox balance in both natural and engineered anaerobic microbial systems, driving key biochemical processes such as energy generation, bioremediation, and waste degradation. While EET has been characterized in a limited number of microbes and applied in anaerobic digestion and bioelectrochemical systems, further research is needed to explore its mechanism across a broader range of microbial species and anaerobic processes. This review highlights advanced modeling frameworks that provide deeper insights into EET mechanisms and dynamics, aiming to optimize research efforts and minimize time and resource expenditure.
View Article and Find Full Text PDFBiological VFAs production from proteinaceous wastewater varied with protein type: The role of protein exposed enzyme cleavage sites and hydrolysates biotransformation capacity.
Water Res
January 2025
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China. Electronic address:
Proteinaceous wastewater contains various proteins, which can be valorized to biobased volatile fatty acids (VFAs), important substrates for the synthesis of biodegradable plastics, biodiesel, bioelectricity, etc., but the influence of protein type on VFAs has never been documented. It was found that among the five proteinaceous wastewater proteins investigated, ovalbumin and casein produced the most and the least VFAs, respectively.
View Article and Find Full Text PDFConformational dynamics of a multienzyme complex in anaerobic carbon fixation.
Science
January 2025
Redox and Metalloprotein Research Group, Max Planck Institute of Biophysics, Frankfurt am Main, Germany.
In the ancient microbial Wood-Ljungdahl pathway, carbon dioxide (CO) is fixed in a multistep process that ends with acetyl-coenzyme A (acetyl-CoA) synthesis at the bifunctional carbon monoxide dehydrogenase/acetyl-CoA synthase complex (CODH/ACS). In this work, we present structural snapshots of the CODH/ACS from the gas-converting acetogen , characterizing the molecular choreography of the overall reaction, including electron transfer to the CODH for CO reduction, methyl transfer from the corrinoid iron-sulfur protein (CoFeSP) partner to the ACS active site, and acetyl-CoA production. Unlike CODH, the multidomain ACS undergoes large conformational changes to form an internal connection to the CODH active site, accommodate the CoFeSP for methyl transfer, and protect the reaction intermediates.
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