The effects of vanadate were examined by monitoring intracellular free calcium concentration ([Ca2+]i) and amylase secretion in collagenase-dispersed rat pancreatic acinar cells. Vanadate increased [Ca2+]i by mobilizing calcium from agonist-releasable intracellular calcium stores, since this inc...

Our objective was to evaluate the role of vanadate on calcium extrusion in Fura-2-loaded rat pancreatic acinar cells by digital microscopic fluorimetry and spectrofluorimetry. In the absence of extracellular calcium, perfusion of pancreatic acinar cells with 1 nM CCK-8 and 1 mM vanadate did not ...

Over the last few decades there has been increasing interest in oxometalate and polyoxometalate applications to medicine and pharmacology. This interest arose, at least in part, due to the properties of these classes of compounds as anti-cancer, anti-diabetic agents, and also for treatment of ne...

Scanning electron microscopy (SEM), X- ray diffraction (XRD), density (d), oxygen molar volume (Vm) and dc conductivity of different compositions of calcium vanadate glasses are reported. SEM exhibits a surface without any presence of a microstructure which is a characteristic of the amorphous p...

Calcium hydroxyapatites substituted with vanadate were prepared for use as catalysts in the oxidative dehydrogenation of propane. Phosphate in the hydroxyapatite could not be fully substituted by vanadate, but partial substitution achieved an atomic ratio of V/P = 0.15. The conversion for propan...

Single phase Eu3+ activated calcium bismuth vanadate (CaBiVO5) phosphors have been successfully synthesized using solid state reaction method. X-ray diffraction (XRD) analysis confirms the pure phase formation and scanning electron microscope (SEM) micrographs exhibit inhomogeneous particle form...

Europium- and copper-doped calcium vanadates with the general formula Ca3-1.5x-yEuxCuy(VO4)2 (x = 0, 0.075; y = 0, 0.06 and 0.18) were synthesized by the solid state reaction. Synthesized materials were analyzed by the powder X-ray diffraction (PXRD), UV–Vis, Raman, luminescence spectroscopy, a...

Calcium cobalt vanadate of Ca2.5Co2V3O12 (CCVO) formula is characterized by a defect garnet structure involving a partial (5/6) occupation of the dodecahedral cation site. In this work, the crystal structure and thermal expansion are investigated for this compound using powder X-ray diffraction....

Various adlayers were grown on the (111) surface of a platinum crystal by four different oxidizing treatments. The resulting surface phases were characterized by X-ray photoelectron spectroscopy. According to the Pt 4f and O 1s XPS spectra, treatment in 0.1 MPa O2 at 900 K yielded about two mono...

The surface of a platinum electrode was anodically polarized at 3 V vs standard hydrogen electrode in 1 N H2SO4at 300 K for 16 h so that a thick uniform oxidation layer was formed. Analysis by X-ray photoelectron spectroscopy (XPS) showed that the stoichiometry O-to-Pt of this layer was equal to...

A thick oxidation layer on a platinum electrode has been grown in 1 N NaOH at 3 V vs Ag/AgCl reference electrode. After transferring the Pt electrode into an ultrahigh vacuum chamber the surface layer was analysed by X-ray photoelectron spectroscopy. Pt4f5/2 amd O1s electron binding energies of ...

A platinum electrode surface has been anodically oxidized in 1N H2SO4. The electrode was transferred into an ultrahigh vacuum chamber and the surface compound formed was analyzed by electron energy loss spectroscopy. The absence of the characteristic vibrations of water showed, in accordance wit...

CO oxidation on platinum oxide deposited by magnetron sputtering on flat (Si) and highly porous (multi-walled carbon nanotubes, MWCNT) substrates were examined using X-ray photoelectron spectroscopy, scanning tunneling microscopy, temperature-programmed desorption and temperature-programmed reac...

The present work evaluates the influence of RuSn catalyst supported on La2O3, TiO2, SiO2 and Nb2O5 in dimethyl adipate (DMA) hydrogenation to obtain 1,6-hexanodiol. The catalysts were prepared by impregnation method, calcined and reduced at 673 K. The reactions were carried out in liquid phase i...

The combination of a porphyrin system and a platinum fragment in the same molecule should not only result in the additivity of the photodynamic activity of the porphyrin and the cytostatic activity of the platinum, but also in the enrichment of the porphyrin platinum conjugate in tumors, which p...

By oxidation of mononuclear and dinuclear platinum(II) complexes having as ligands N4-acylated 1,2,4-triaminobutane units with H2O2 an intermediate was observed, probably a platinum bound hydroperoxide which is stabilized by hydrogen bonding to the acyl function in the side chain. Such an interm...

Forty porphyrin platinum conjugates were synthesized, which exhibited a photodynamic effect due to the porphyrin system and a cytostatic effect due to the platinum fragment present in the same molecule. The porphyrin ligands for the platinum complexes were synthesized starting from hematoporphyr...

Electrochemical activation of heterostructures formed by hydroxide proton and two electronic conductors, with one of them being palladium, initiates formation of protonic heterojunctions PdHx|BaCe0.9Nd0.1O2.9 − y / 2(OH)y and PdHx|KOH·nH2O, where x

Highly regio- and stereoselective dimerization of terminal acetylenes occurs in the presence of [PdCl2(IPr)(3-chloropyridine)], other members of the family of PEPPSI precatalysts and the structurally related N-heterocyclic carbene palladium dimers, i.e. [{Pd(μ–Cl)Cl(IPr)}2] and [{Pd(μ–OH)Cl(...

In this research, hydrazine and nitrite determination was performed based on the reaction of methylene blue with hydrazine in the presence of palladium nanoparticles (PdNPs) as catalyst. The system was monitored spectrophotometrically by measuring the decrease in the absorbance of the methylene ...