The 1-H nuclear magnetic resonance spectrum of living tunicate blood cells was examined in an attempt to develop a biophysical assay for the native vanadium chromogen. The living cell spectrum was found to exhibit a broad 21 ppm downfield Gaussian signal which, however, disappears immediately upon cell disruption. Examination of the properties of this extremely low field signal revealed that it...

Diabetes mellitus is accompanied by hormonal and neurochemical changes that can be associated with anxiety and depression. Both diabetes and depression negatively interact, in that depression leads to poor metabolic control and hyperglycemia exacerbates depression. We hypothesize one novel vanadium complex of vanadium-enriched Cordyceps sinensis (VECS), which is beneficial in preventing depress...

We examined the electrical and optical properties of vanadium-doped GaAs grown by metalorganic vapour phase epitaxy using vanadium tetrachloride (VCl4) as a novel dopant source. Samples with various vanadium incorporations were investigated. All samples were n type. The electron concentration dependence on the VCl4 flow rate was established. At 15 K, by comparison with undoped layers grown in t...

Since insulin-dependent diabetes mellitus (IDDM), which causes many severe secondary complications, is characterized by hyperglyceria due to absolute deficiency of insulin, the diseases is controlled by daily injection of insulin. Therefore, the development of insulin replacements of mimetics upon oral administration is an important investigation. Recent studies indicate that vanadium, which is...

The possibility of application of 4-nitrocatechol (4-NC) - tetrazolium salt - organic solventsystems for liquid-liquid extraction-spectrophotometric vanadium (IV and V) speciation wasstudied. Six commercially available tetrazolium salts (2,3,5-triphenyltetrazolium chloride (TTC),3-(2-naphtyl)-2,5-diphenyltetrazolium chloride (Tetrazolium Violet, TV); 3-(4,5-dimethyl-2-thiazol)-2,5-diphenyltetra...

LO81 MODELS FOR THE ACTIVE SITES IN THE MANGANESE CATALASE, OXYGEN EVOLVING COMPLEX AND VANADIUM BROMOPEROXIDASE. V.L. Pecoraro, X. Li, J.A. Bonadies, MS. Lab, E. Larson and S. Saadeh, Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-I 055, USA. Schiff Base and a-hydroxy acid complexes of manganese will be presented as models for the spectroscopic and reactivity behavior of ...

Vanadium dioxide (VO(2)) undergoes a sharp metal-insulator transition (MIT) in the vicinity of room temperature and there is great interest in exploiting this effect in novel electronic and photonic devices. We have measured the work function of vanadium dioxide thin films across the phase transition using variable temperature Kelvin force microscopy (KFM). The work function is estimated to be ...

The frequency-dependent complex relative permittivities of binary semiconducting V205-P205 glasses containing various amounts of vanadium have been measured at ambient temperature in the infrared region by power reflection spectroscopy. The measured values of the static constant, ~0, and high frequency constant, s=, are used to calculate the small polaron binding energy, Wp, and the activation ...

21 vanadium bis-phenolate benzimidazolyidene complexes spanning three oxidation states have been investigated. Special emphasis is thereby laid on their salt metathesis reactivity and the accessibility of +IV state by reductive or oxidative routes, starting from vanadium(V) vanadium(III) respectively. While route highly depended reducing agent material used, gives clean access to vanadium(IV) d...

Several oxovanadium(V) complexes have been shown as a potent anticancer agents. In view of the importance of Vanadium complexes a new Vanadium – Morin complex was synthesized and comprehensively characterized. To provide an insight on the mode and affinity of the interaction of these complex with calf thymus (CT) DNA the following experiments were carried out: fluorescence spectroscopy, UV–vis ...