In aqueous media, VIV- and VV-ions compounds undergo chemical changes such as hydrolysis, ligand exchange redox reactions that depend on pH concentration of the vanadium species, nature several components present. particular, behaviour in biological fluids depends their environment many potential ligands However, when reporting action a particular complex, often possibility occurring has been n...

Vanadium, V, is a redox-sensitive metal that in solution, under aerobic conditions, prevails as the oxyanion vanadate(V). There is little known regarding vanadium toxicity to soil biota, and the present study was set up to determine the toxicity of added vanadate to soil organisms and to investigate the relationship between toxicity and vanadium sorption in soils. Five soils with contrasting pr...

The influence of various preparation methods on the performance of V-Nb-0 catalysts has been investigated. It was found that the activity and selectivity of a vanadium site depend on the nature of the neighbouring atoms. Vanadium neighbours provide activity, while niobium neighbours provide selectivity. Careful preparation of these catalysts ensures a homogeneous distribution and good mixing of...

Since the beginning of the last century, it has been known that ascidians accumulate high levels of a transition metal, vanadium, in their blood cells, although the mechanism for this curious biological function remains unknown. Recently, we identified three vanadium-binding proteins (vanabins), previously denoted as vanadium-associated proteins (VAPs) [Zool. Sci. 14 (1997) 37], from the cytopl...

The world is currently in the midst of a climate crises and many across globe are competing to find new technologies create clean, effective ways harnessing renewable energy sources. However, this needs be stored current systems simply would not last. Zinc-ion batteries (ZIBs) with vanadium-containing cathodes recently arising technology providing cheap, safe, eco-friendly alternative systems. ...

A creative hydrothermal synthesis method followed by calcination for vanadium nitride (VN) is reported. The oxygen reduction reaction (ORR) study of the catalyst shows that VN possesses a comparable catalytic performance to commercial Pt/C catalyst. The ORR catalytic activity study of vanadium nitride, vanadium carbonitride, and vanadium carbide reveals that tuning anions offers a promising rou...

Sixteen ram lambs were fed 0, 50 or 200 ppm supplemental vanadium daily as NH4VO3 for 90 d and coccygeal vertebrae were sampled at 0, 15, 30, 6 0 a n d 90 d after the imposition of dietary treatments. Vertebral vanadium content was elevated (P<.05) after exposure to 200 ppm added vanadium in the diet for 15 d, but nonsignificant increases occurred thereafter. Increasing dietary vanadium increas...

Various potential biomarkers were sampled for vanadium every 3-4 months from Bos indicus beef cattle farmed extensively immediately adjacent (high exposure (HE) group) and two km away (low exposure (LE) group) from a vanadium processing plant, respectively. Vanadium intake (mg vanadium kg(-1) bwt d(-1)) was modelled using environmental and physiological data as inputs. The vanadium intake range...

Vanadium is a hard, silver-grey transition metal found in at least 60 minerals and fossil fuel deposits. Its oxide other vanadium salts are toxic to humans, but the effects depend on form, dose, exposure duration, route of intoxication. used by some life forms as an active center enzymes, such bromoperoxidase ocean algae nitrogenases bacteria. The structure biochemistry vanadate resemble those ...

Vanadium K-edge X-ray-absorption spectra were collected for samples of thionine-oxidized, super-reduced (during enzyme turnover) and dithionite-reduced VFe-protein of the vanadium nitrogenase of Azotobacter chroococcum (Acl*). Both the e.x.a.f.s and the x.a.n.e.s. (X-ray-absorption near-edge structure) are consistent with the vanadium being present as part of a VFeS cluster; the environment of ...