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Showing 1 to 20 of 25 for “"METHYL VIOLOGEN"”.
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Polypyrrole modified with sulfated β-cyclodextrin: characterization and application in the sensing of viologens
… a sensor for the detection of three compounds, methyl, ethyl and benzyl viologen. Methyl viologen is commonly known as paraquat and it is one of the most commonly used herbicides worldwide. The sβ-CD was permanently immobilized within the ppy backbone during the potentiostatic growth of the …
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Structural and spectroscopic studies on the porin-cytochrome complex from Shewanella oneidensis MR-1
… inserted" into" liposomes" containing" either"methyl" viologen," small" tetra" heme" cytochrome" (STC)" or" cytochrome" c." Using" these" proteoliposomes" the" rate" of" electron"transfer"across"MtrCAB"was"investigated."MtrCAB"was"seen"to"enable"the"reduction" …
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Responses of Superoxide Dismutases to Oxidative Stress in Arabidopsis thaliana
… oxidative stress, caused by methyl viologen or 3-(3, 4-dichlorphenyl)-1-1′ dimethylurea (DCMU) on SOD populations were investigated. A cloned Arabidopsis thaliana Fe SOD gene was expressed in Escherichia coli and was purified from transformed cells. This protein was used to …
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A biochemical and physiological characterization of coenzyme F420-reducing hydrogenase from Methanobacterium formicicum
… the coenzyme F₄₂₀ dependent activity but not the methyl viologen-dependent activity of the purified enzyme. Cell extract of M. formicicum contained a coenzyme F₄₂₀-mediated formate hydrogenlyase system. Formate hydrogenlyase activity was reconstituted with coenzyme F₄₂₀-reducing hydrogenase, …
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The F(430) cofactor of methyl coenzyme M reductase: Ligand binding to the nickel and chemical modification of the tetrapyrrole substituents
… and spectroscopic studies on the nickel enzyme methyl-CoM reductase from M. thermoautotrophicum (strain $\Delta$H) were undertaken to better characterize the nickel site. The major goals of this work are two-fold: (1) To further characterize the molecular and electronic structure of the …
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Engineered Vesicles for Perchlorate Degradation
… Perchlorate reduction was quantified using a methyl viologen colorimetric technique. The vesicle solutions had perchlorate-reducing activities ranging from 35-45 units per liter. This work shows that vesicles can provide a mechanism to utilize environmentally-relevant biological enzymes. When …
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Sustainable photocatalysis using carbon-based materials through interfacial and solvent engineering
… interfacial interaction between carbon dots and methyl viologen enabled efficient and robust charge extraction from carbon dot, which subsequently generated ultra-long-lived radical species, achieving an oxidative quenching pathway. In addition, covalent modification of carbon dots with methyl …
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Supramolecular effects in pyridinium compounds and their application towards practical redox flow battery systems
… both cucurbit[*n*]uril (CB[*n*]) macrocycles and methyl viologen are leveraged to advance an additive concept for AORFBs that enables stable and tuneable multi electron accessibility – without the need for synthetic modification. By encapsulating methyl viologen in all oxidation states, CB[7] …
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Optofluidic Microreactors for Advanced Photocatalysis
… concentrations possible. The photoreduction of methyl viologen by carbon nanodots (CNDs) was studied and compared to theory by modelling reaction pathways. Oxidation states of cobaloximes, that are currently employed as molecular catalysts for solar hydrogen generation, could be studied and …
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Studies on cytochromes and electron transport in Methanosarcina thermophila strain TM-1
… methanogenesis from H₂/CO₂, formate, methanol, methylamines, and acetate. Methanosarcina conserve energy by coupling electron transport and methyl transfer to the generation of ion gradients during acetoclastic growth. This work focuses on cytochrome b and heterodisulfide reductase, two proteins …
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The influence of low moisture stress on the gas exchange and thylakoid activity of loblolly pine (pinus taeda) and aleppo pine (pinus halepensis)
… L<sup>td</sup>) as rate of O₂ consumption. Methyl Viologen (1,1’ -dimethyl -4, 4’- bipyridinium ion ) was included in the reaction medium. Photosynthesis decreased with increasing water stress but fell more slowly in the conditioned seedlings. As water stress increased, total resistance to …
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Design, Synthesis and Characterisation of π-Extended Viologen-Based Molecular and Supramolecular Complexes with Cucurbit[n]urils
Viologens, 4,4'-bipyridinium dications (V$^{2+}$), have attracted much attention as electron mediators in a variety of photochemical, electrochemical and chemical processes ranging from catalysis, electrochromic devices to solar energy conversion and storage systems. % The different applications of …
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Towards new model systems for the study of proton-coupled electron transfer
… bpy = 2,2'-bipyridine) where methyl viologen (MV2 ) electron acceptors were appended to the ruthenium aqua complex through the bpy. Picosecond transient absorption measurements show that electron transfer from the excited state of the ruthenium complex to MV2+ occurs with [tau] …
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Cucurbit[n]uril-engineered Nano-constructs for Molecular Sensing
… More specifically, CB[8] is threaded onto a methyl viologen (MV2+) axle and immobilised onto silica NPs with a surface density up to 0.56 nm$^{−2}$. Its use as an efficient and recyclable nanoplatform for peptide separation is demonstrated. The peptides captured by the catenanes can be …
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Water-Soluble Redox Materials and Their Applications in Aqueous Batteries
… alkaline redox flow battery is studied by using methyl viologen (MV) as anolyte and potassium ferrocyanide as catholyte. MV is for the first time explored in the alkaline condition, which shows enhanced electrochemical kinetics compared to in the neutral system. This work demonstrates the …
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Exploring reactivity and component interactions in Toluene/o-Xylene Monooxygenase from pseudomonas sp. OX1
… ToMOH and ToMOD, but with dithionite and methyl viologen supplying the electrons. Here, we revisit the dioxygen activation experiments but with ToMOC, ToMOF, and NADH. The use of these proteins and NADH dramatically alters dioxygen activation chemistry and subsequent arene hydroxylation in …
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Electrodeposited nanoparticles: properties and photocatalytic applications
… with an adsorbed monolayer of 3-aminopropyldimethylmethoxysilane, and manipulation of the potential pulse scheme, especially using a double pulse 'nucleation and growth' approach. The optimised method for production of silver and gold nanoparticulate surfaces was utilised to selectively create …
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Development and testing of thin photocatalyst films
… using the oxidations of 4-chlorophenol and methylene blue, as well as the reductions of methylene blue and resazurin, in solution and ink forms. The photoactivity of TiO<sub>2</sub>-SEN film is measured against Pilkington Activ™ glass for each of these reactions, which is a commercial …
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Ferritin: Mechanistic Studies and Electron Transfer Properties
… channels. When native HoSF is reduced by methyl viologen in saline solutions, small anions such as F-, Cl-, and Br , accumulate in the ferritin interior while phosphate is released. No anion transfer is observed during the reduction of reconstituted HoSF with no phosphate in the core. The …
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An Electrochemical Investigation into the Corrosion Protection Properties of Coatings for the Active Metal Copper
… of multiwalled carbon nanotubes (MWCNT), and viologen films adsorbed at copper. The corrosion protective properties of these films were studied and compared to the uncoated copper substrate. They were assessed and studied using a combination of cyclic voltammetry, polarisation curves, Tafel …
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