Solvent sensitive organic/inorganic hybrid one-dimensional photonic crystals (1DPCs) were prepared through alternating thin films of poly methyl methacrylate-co-hydroxyethyl methacrylate-co-ethylene glycol dimethacrylate (PMMA-co-PHEMA-co-PEGDMA) and titania nanoparticle sol by spincoating. Since the titania layer has a higher refractive index compared with the polymer layer, an obvious photoni...

The effects of ethanol, ethylene glycol, dioxane, and other organic co-solvents upon the hydrogen exchange rates of randomly coiled oxidized RNase, native RNase, and native trypsin have been measured. The exchange rate of oxidized RNase, the model compound for the proton transfer step in hydrogen exchange, is decreased by all of the co-solvents studied at temperatures in the range 3-20 degrees....

The title complex, [Co(C21H16N4)2][Co(NCS)4]·CH3OH, consists of one [Co{C(py)4}2](2+) complex cation [C(py)4 = tetra-kis-(pyridin-2-yl)methane], one [Co(NCS)4](2-) complex anion and a methanol solvent mol-ecule. In the cation, the Co(II) atom is coordinated by six N atoms of two C(py)4 ligands in a distorted octa-hedral geometry. In the anion, the Co(II) atom is coordinated by the N atoms of fo...

The effect of the addition of ethylene glycol (EG) on the interfacial adsorption and micellar properties of the alkylglucoside surfactant n-octyl-β-D-thioglucopyranoside (OTG) has been investigated. Critical micelle concentrations (cmc) upon EG addition were obtained by both surface tension measurements and the pyrene 1:3 ratio method. A systematic increase in the cmc induced by the presence of...

Biodiesel is considered a promising replacement to petroleum-derived diesel. Using oils extracted from agricultural crops competes with their use as food and cannot realistically satisfy the global demand of diesel-fuel requirements. On the other hand, microalgae, which have a much higher oil yield per hectare, compared to oil crops, appear to be a source that has the potential to completely re...

Poor solubility and bioavailability are limiting factors for the clinical application of curcumin. The objective of the current study was to develop a liquid formulation with increased solubility and systemic bioavailability. A co-solvent formulation with increased solubility of 20 mg/ml was developed and optimized. Pharmacokinetics of the new formulation were evaluated using rats receiving 30 ...

A simple and rapid HPLC method for determination of chlorogenic acid (5-O-caffeoylquinic acid) in mate tea extracts was developed and validated. The chromatography used isocratic elution with a mobile phase of aqueous 1.5% acetic acid-methanol (85:15, v/v). The flow rate was 0.8 mL/min and detection by UV at 325 nm. The method showed good selectivity, accuracy, repeatability and robustness, wit...

Phthalocyanine complexes of Cu, Co, Ni, Fe, Zn, Pd, Pt and Ru have been synthesized from reaction between phthalonitrile and proper metal salts upon exposure to microwave irradiation under solvent-free conditions and considerably reduced reaction times.