viologen


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viologen

[vī′äl·ə·jən]
(chemistry)
Any member of a group of chlorides of certain quaternary bases derived from γ,γ′-dipyridyl that are used as oxidation-reduction indicators; color is exhibited in the reduced form.
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Based on material, market is segmented into polymers, transition metal oxides, reflective hydride, viologen and nanocrystal.
The device structure consisted of a PQT layer and an ethyl viologen diperchlorate (EV[(Cl[O.
2)Methyl viologen dichloride hydrate Purity: 98% (Aldrich catalogue 856177 or equivalent.
The electron transfer from microbial cells to the electrode is facilitated by mediators such as thionine, methyl viologen, humic acid etc (Lithgow et al.
For sulphide oxidase estimation the fresh gill and foot of one Adipicola MV and all the soft parts from four very small mytilids were homogenized in distilled water, centrifuged, and the supernatant fluid from each was assayed for sulphide oxidase activity by the benzyl viologen reduction method (Powell & Somero 1985) at 29[degrees]C.
Specific topics include control of refractive index and internal stress in tantalum oxide films deposited by modified plasma sputtering, adhesion layer effects on the fabrication of MEMS-based PZT devices deposited on substrates coated with silicon nitride, adhesion assessment of ultra-thin plasma-polymerized coatings on stainless steel stents using the small punch test, surface modification of micro-patterned polytetrafluoroetholene films through grafting of viologen for electronless metallization and surface treatments of plastic substrates for improved adhesion of thin metal films through ion bombardment for an anode layer ion source.
The electron transfer to the anode is facilitated with an electron transfer mediator such as methylene blue, methyl viologen, or other viologen dyes.
We have investigated the sensing capability of a commercially available polythiophene, poly[2-(3-thienyl)ethoxy4-butylsulfonate] (Mw = 1,000,000 g/mol), in aqueous solution, using methyl viologen ([MV.
10) Effect of casting solvents on the properties mid higher-order structure of viologen type poly(oxytetramethylene) ionene elastomer.
2] is reductively fixed in an organic molecule, the enzyme isocitrate dehydrogenase (ICDH) is oxidized; the oxidized enzyme is ultimately reduced back to its original form by the mediator methyl viologen ([MV.
The sources of superoxide radical generation may be natural--that is, by-products of metabolic activities, including the electron-transport chain--or induced by external agents--including ozone, UV B, gamma rays, light-induced photoinhibitory conditions, or chemicals like paraquat or methyl viologen.
Systematic Analysis of Superoxide Dependent Signalling in Plant Cells: The Usefulness and Specificity of Methyl Viologen Application (Jacob and Dietz)