nifedipine (nif), a 1,4-dihydropyridine calcium channel antagonist, undergoes photo-degradation to dehydro-nifedipine (dnif) upon exposure to ultraviolet (uv) light and to the nitroso analogue of dehydro-nifedipine (ndnif) when exposed to sunlight or some kinds of artificial lights. nif photo-degradation products do not contribute to clinical activity, thus prevention of photo-degradation of ni...

to improve the photo-catalytic degradation of salicylic acid, we reported the fabrication of ordered tio2 nanotube arrays by a simple and effective two-step anodization method and then these tio2 nanotubes treated in a methanol solution under uv light irradiation. the tio2 nanotubes prepared in the two-step anodization process showed better photo-catalytic activity than tio2 nanotubes prepared ...

a three-step selective photo-ionization for gd155 and gd157 isotopes by pulsed laser wasevaluated numerically. due to large thermal neutron absorption cross sections, these two isotopes innatural gadolinium are good candidates as burnable poison to control reactivity early in the fuel cycleand allow extended fuel burn up. rate equations have been used to calculate the dynamics of the isotopepop...

In this work, H3PW12O40 (PPT) and nano-sized titania supported on urea formaldehyde (UF) resinwas prepared via an impregnation method. The prepared sample was characterized by X-raydiffraction (XRD), UV-Vis spectrophotometer, Fourier transform infrared spectroscopy (FT-IR),scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The photocatalyt...

In this study, different samples of Niobium and Vanadium co-doped titania  thin films (5-10-15 mol% Nb and 5-10-15 mol% V) were prepared via sol−gel dip coating method, using niobium chloride as niobium precursor, ammonium metavanadate as vanadium precursor, and titanium (IV) butoxide (TBT) as titanium precursor. The effects of doping amount on the structural, optical, and photo-catalytic prope...

Our previous study revealed that aqueous extract of grape pomace obtained from a winemaking process could exert bactericidal action upon photo-irradiation via reactive oxygen species (ROS) formation. In the present study, we focused on chemical composition and prooxidative profile of the extract. Liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) analysis showed that po...

In this study, different samples of Niobium and Vanadium co-doped titania  thin films (5-10-15 mol% Nb and 5-10-15 mol% V) were prepared via sol−gel dip coating method, using niobium chloride as niobium precursor, ammonium metavanadate as vanadium precursor, and titanium (IV) butoxide (TBT) as titanium precursor. The effects of doping amount on the structural, optical, and photo-catalytic prope...

The photo-oxidation of lysozyme (hen’s egg white), sensitized by methylene blue in 84% acetic acid solution, causes the selective modification of the methionyl residues, which are converted to the sulfoxide. The photo-oxidized protein shows a drastically reduced enzymic activity. The data obtained by comparing the sensitivity to proteolytic enzymes, as. well as the accessibility of disulfide bo...