Topic
Redox
About: Redox is a research topic. Over the lifetime, 26853 publications have been published within this topic receiving 862368 citations. The topic is also known as: reduction-oxidation & reduction-oxidation reaction.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, it was shown that bismuth atoms are selectively and homogeneously deposited on the palladium particles by a surface redox reaction on Pd/C catalysts containing 1-to 2-nm Pd particles.
225 citations
TL;DR: In addition to iron-reducing bacteria, fermenting bacteria are also capable of channeling electrons from anaerobic oxidations via humic acids towards iron reduction, indicating that future studies of electron flow in soils and sediments should be considered.
Abstract: Iron-reducing bacteria have been reported to reduce humic acids and low-molecular-weight quinones with electrons from acetate or hydrogen oxidation. Due to the rapid chemical reaction of amorphous ferric iron with the reduced reaction products, humic acids and low-molecular-weight redox mediators may play an important role in biological iron reduction. Since many anaerobic bacteria that are not able to reduce amorphous ferric iron directly are known to transfer electrons to other external acceptors, such as ferricyanide, 2,6-anthraquinone disulfonate (AQDS), or molecular oxygen, we tested several physiologically different species of fermenting bacteria to determine their abilities to reduce humic acids. Propionibacterium freudenreichii, Lactococcus lactis, and Enterococcus cecorum all shifted their fermentation patterns towards more oxidized products when humic acids were present; P. freudenreichii even oxidized propionate to acetate under these conditions. When amorphous ferric iron was added to reoxidize the electron acceptor, humic acids were found to be equally effective when they were added in substoichiometric amounts. These findings indicate that in addition to iron-reducing bacteria, fermenting bacteria are also capable of channeling electrons from anaerobic oxidations via humic acids towards iron reduction. This information needs to be considered in future studies of electron flow in soils and sediments.
225 citations
225 citations
TL;DR: In this article, the reduction of N 2 O by CO was investigated over FeMFI zeolites prepared by different methods including sublimation, liquid ion exchange, and hydrothermal synthesis followed by steam activation.
225 citations
TL;DR: An approach that allows site-specific positioning of electron-mediating units in redox proteins that greatly enhanced electrical contact between an electrode and the resulting enzyme in solution is greatly enhanced in a controlled and reproducible way is reported.
Abstract: EFFICIENT electron transfer of redox proteins to and from their environment is essential for the use of such proteins in biotechnological applications such as amperometric biosensors and photosynthetic biocatalysts1–3. But most redox enzymes lack pathways that can transport an electron from their embedded redox site to an electrode4,5 or a diffusing photoexcited species6. Electrical communication between redox proteins and electrode surfaces has been improved by aligning proteins on chemically modified electrodes7–9, by attaching electron-transporting groups10,11 and by immobilizing proteins in polymer matrices tethered by redox groups12–14. Generally these methods involve contacting the enzymes at random with electron relay units. Here we report an approach that allows site-specific positioning of electron-mediating units in redox proteins. We strip glucose oxidase of its flavin adenine dinucleotide (FAD) cofactors, modify the latter with redox-active ferrocene-containing groups, and then reconstitute the apoprotein with these modified cofactors. In this way, electrical contact between an electrode and the resulting enzyme in solution is greatly enhanced in a controlled and reproducible way.
224 citations