Biotechnol Bioeng
Swette Center for Environmental Biotechnology, ASU Biodesign Institute, Arizona State University, 1001 S. McAllister Ave., Tempe, AZ 85287, USA.
Published: April 2013
The objective of this study was to employ microbial electrochemical cells (MXCs) to selectively enrich and examine anoxygenic photosynthetic bacteria for potential anaerobic respiration capabilities using electrodes. In the process, we designed a novel enrichment strategy that manipulated the poised anode potential, light, nitrogen availability, and media supply to promote growth of phototrophic bacteria while minimizing co-enrichment of non-phototrophic anode-respiring bacteria (ARB). This approach resulted in light-responsive electricity generation from fresh- and saltwater inocula. Under anoxic conditions, current showed a negative light response, suggesting that the enriched phototrophic consortia shifted between phototrophic and anaerobic respiratory metabolism. Molecular, physical, and electrochemical analyses elucidated that anode biofilms were dominated by green sulfur bacteria, and biofilms exhibited anode respiration kinetics indicative of non-mediated electron transfer, but kinetic parameters differed from values previously reported for non-phototrophic ARB. These results invite the utilization of MXCs as microbiological tools for exploring anaerobic respiratory capabilities among anoxygenic photosynthetic bacteria.
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http://dx.doi.org/10.1002/bit.24779 | DOI Listing |
Eur J Oral Sci
January 2025
Department of Biology, Faculty of Science, Ege University, Izmir, Turkiye.
The aims of this study were twofold: first, to investigate the surface roughness of different abutment materials prepared using various manufacturing methods; and, second, to evaluate colonization by Streptococcus mutans and Candida albicans according to abutment material and manufacturing method. Six material/manufacturing method combinations were investigated in this study, namely chromium-cobalt (Cr-Co) (prepared using casting, milling, and laser sintering) and titanium, zirconia, and anodized titanium (all prepared using milling); titanium (stock) abutments were used as the control group. Surface roughness of seven specimens from each group was evaluated using atomic force microscopy and scanning electron microscopy.
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January 2025
Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, University of Nottingham Ningbo China, Ningbo, China.
Electrodes functionalised with weak electroactive microorganisms offer a viable alternative to conventional chemical sensors for detecting priority pollutants in bioremediation processes. Biofilm-based biosensors have been proposed for this purpose. However, biofilm formation and maturation require 24-48 h, and the microstructure and coverage of the electrode surface cannot be controlled, leading to poorly reproducible signal and sensitivity.
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December 2024
Institute of Technical Microbiology, University of Technology Hamburg, Hamburg, Germany.
In bioelectrochemical systems (BES), biofilm formation and architecture are of crucial importance, especially for flow-through applications. The interface between electroactive microorganisms and the electrode surface plays an important and often limiting role, as the available surface area influences current generation, especially for poor biofilm forming organisms. To overcome the limitation of the available electrode surface, nanoparticles (NPs) with a magnetic iron core and a conductive, hydrophobic carbon shell were used as building blocks to form conductive, magnetic micropillars on the anode surface.
View Article and Find Full Text PDFJ Prosthodont
January 2025
Department of Prosthodontics, Indiana University School of Dentistry, Indianapolis, Indiana, USA.
Purpose: To assess the impact of anodization and instrumentation on titanium abutment surface characteristics (surface roughness and wettability) and biofilm formation (viability and mass).
Materials And Methods: Titanium discs were obtained from pre-milled abutment blanks made of titanium-6aluminum-7niobium alloy. Polished samples were divided into three groups: un-anodized, gold-anodized, and pink-anodized.
J Environ Manage
February 2025
Department of Chemical & Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, 45701, USA; Department of Biological Sciences, Molecular & Cellular Biology Program, Ohio University, Athens, OH, 45701, USA. Electronic address:
Biofilms can cause biofouling, water quality deterioration, and transmission of infectious diseases. They are also responsible for microbiologically influenced corrosion (MIC) which can cause leaks, resulting in environmental disasters. A new disposable biofilm/MIC test kit was demonstrated to distinguish abiotic corrosion of carbon steel from MIC.
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