a thermodynamic study of copper ions by jack bean urease (jbu) was carried out at two temperatures of 27 and 37?c in tris buffer (30 mm; ph=7.0) using an isothermal titration calorimetry. there is a set of twelve identical and non-interacting binding sites for copper ions. the intrinsic dissociation equilibrium constant and the molar enthalpy of binding are 285 µm and ?15.2 kj/mol at 27?c and 3...

The interaction of Congo Red CR with a series of Alkyltrimethylamoniumbromide CnTAB, N-hexadecylpyridinium bromide CPB and N-hexadecylpyridinium CPC were investigated using conductometry technique. It was observed that the formation of dye-surfactant ion pairs takes place at surfactant concentration far below the critical micelle concentration of the individual surfactants. Aggregation was refl...

This paper presents an application of plastic evolu tion to design a new chemical index (the coordination index , ( .) that permits molecular characterizati on. Ie is applied to homologous series of phenyl alcohols and 4-alkylanilines. and compared to charge indices for dipole mome nt. The parameters needed to calcu late Ie are minus the standard enthalpy of formation T, molecu lar surface area...

Metformin is one of the important anti-diabetic drugs to treat non-insulin dependent diabetes mellitus (NIDDM). Fourier transform infrared (FTIR) and Fourier transform Raman (FTR) spectra of metformin have been used for the molecular study. A satisfactory band assignment has been made on the fundamental modes of vibration. Employing the molecular mechanics method using MM3 force field, the theo...

In this study, Ba3SrNb2O9(s) was synthesized using conventional solid-state reaction route, characterized by powder XRD and SEM-EDAX. The standard molar enthalpy of formation determined measuring enthalpies solution in {PbO + B2O3} solvent (in 2:1 ratio) at T = 966 K an oxide melt high temperature calorimeter. increment measured with same heat capacity the also employing DSC. Based on smoothed ...