Vanadium compounds exert preventive effects against chemical carcinogenesis on animals, by modifying, mainly, various xenobiotic enzymes, inhibiting, thus, carcinogen-derived active metabolites. Studies on various cell lines reveal that vanadium exerts its antitumor effects through inhibition of cellular tyrosine phosphatases and/or activation of tyrosine phosphorylases. Both effects activate s...

In this paper we present the fluorescence decay profiles of vanadium and titanium doped gallium lanthanum sulphide (GLS) glass at various doping concentrations between 0.01 and 1% (molar). We demonstrate that below a critical doping concentration the fluorescence decay profile can be fitted with the stretched exponential function: exp[-(t/τ)], where τ is the fluorescence lifetime and β is the s...

Systematic explorations of new phases in the Ag(I)-Ti(IV)/V(V)/Mo(VI)-iodate systems led to four new quaternary silver iodates, namely, Ag(2)Ti(IO(3))(6), Ag(2)(VO(2))(IO(3))(3), Ag(2)(V(2)O(4))(IO(3))(4), and Ag(2)(MoO(2))(IO(3))(4). They represent the first examples of silver iodates containing d(0) transition metal cations. Ag(2)Ti(IO(3))(6) is isostructural with K(2)Ti(IO(3))(6) and its str...

In this study, we report the influence of vanadium oxide (VO), as a photosensitive component, on photoactivity TiO2 nanotubes (TNTs). A series TNTs varying tube diameter were synthesized by anodization titanium foils at different voltages, while was deposited wet chemical deposition. An improvement in optical properties observed after deposition oxide. (redshift UV-Vis spectra) and TNT/VO noted...

Two simple, rapid and sensitive spectrophotometric methods have been proposed for the determination of vanadium(V) using butaperazine dimaleate (BPD) and propionyl promazine phosphate (PPP). These methods are based on the formation of red-colored radical cations on reaction with vanadium(V) in phosphoric acid medium, with their absorbance maxima at 513 nm. Beer's law is valid over the concentra...

A solvent-extraction spectrophotometric technique is proposed as a new method for determination of trace quantities of vanadium. Sodium salt of 2-mercapto-pyridine-N-oxide (thione) forms a complex with vanadium instantaneously. The purple 1:2 complex is formed of pH 2.3, easily extracted in chloroform and shows strong absorbance at 500 nm. The extracted complex is found to obey Beer's law i...

Sodium-ion batteries (SIBs) have received intensive attentions owing to the abundant and inexpensive sodium (Na) resource. Layered vanadium oxides are featured with various valence states and corresponding compounds, and through multi-electron reaction they are capable to deliver high Na storage capacity. The rational construction of unique structures is verified to improve their Na storage pro...

Vanadium extraction methods were developed for iron-vanadium-phosphorus (FeV-P) melts derived from processing of V-bearing titanomagnetites and steel slags. Studies on phase relationships of V slags were carried out to provide important understanding of the extraction processes. Phase relationship in vanadiferous slag was investigated experimentally at 1573K, 1673K and 1773K, for the compositio...

Marine red algae (Rhodophyta) are a rich source of bioactive halogenated natural products. The biogenesis of the cyclic halogenated terpene marine natural products, in particular, has attracted sustained interest in part because terpenes are the biogenic precursors of many bioactive metabolites. The first enzymatic asymmetric bromination and cyclization of a terpene, producing marine natural pr...