As the fossil fuels kept on depleting, intense research in developing hydrogen (H2) as the alternative fuel has been done to cater our tremendous demand for fuel. The potential of H2 as the ultimate clean fuel differs with the fossil fuel that releases significant amounts of carbon dioxide (CO2) into the surrounding and leads to the global warming. The experimental work was carried out to study...

The transformation and cooling crystallization of anhydrate form (form III) and dihydrate form (CBZH) of carbamazepine (CBZ) have been investigated in this work. The two forms were unambiguously characterized with powder X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy and thermal analysis. The solubility of the two forms in various al...

Interfaces are ubiquitous. They occur everywhere. They are the boundaries that separate distinct physical and chemical regions of matter. The bulk materials on adjacent sides of the interface can be chemically identical, as with a liquid water/vapor water interface, or they can be chemically different, as at ~t liquid/liquid interface such as hexadecane/water. All transfers of chemical species ...

The or-chymotrypsin-catalyzed hydrolysis of p-nitrophenyl acetate has been studied at pH 7 and 25’ in isopropyl alcoholwater and dioxane-water mixtures. It was found that the initial reaction in which the enzyme is acylated follows second order kinetics rather than Michaelis-Menten kinetics as previously reported. The second order rate constant for this reaction is markedly decreased by additio...

Phosphorescence spectroscopy has been used to probe the microenvironments of the tryptophan residues of the cyclic antibiotic decapeptides tyrocidine B (which contains a single tryptophan residue) and tyrocidine C (which contains 2 tryptophan residues). Both peptides exhibited two distinct, overlapping tryptophan phosphorescence emission spectra under appropriate solvent conditions. The two emi...

a new method was developed for the spectral resolution by further determination of three- and  four-component  mixtures  of  drugs in urine samples through  the complementary application of multivariate curve resolution-alternating least squares with correlation  constraint. in the current study, a simple method was proposed to construct a calibration set for the mixture of drugs in the presenc...