The electro-oxidation of valacyclovir has been studied at a glassy carbon electrode in phosphate buffer media by using cyclic voltammetric technique. Effects of anodic peak potential (Epa), anodic peak current (ipa), pH and heterogeneous rate constant (ko) have been discussed, single irreversible voltammogram was observed. The effects of scan rate, pH, concentration and temperature were evaluated. The electrode processes were shown to be diffusion controlled and irreversible involving adsorption effects. The electro-oxidation product of valacyclovir has been identified by MALDI2-((2-amine-6, 8-dioxo-7, 8-dihydro-3H-purin9(6H)-yl)methoxy)ethyl2-amino-3-methylbutanoate), involving 2-electron and 2-porton oxidation. Thermodynamic parameters such as activation energy Ea=27. 51 kJmol-1, enthalpy Δ H#=25. 03 kJmol-1, entropy Δ S#=-284. 8 JK-1mol-1, Gibbs free energy Δ G#=109. 9 kJmol-1 and Arrhenius factor, logA=-2. 08 and analytical parameters linearity range 5. 0×10-3 to 7. 5×10-5 M, LOD=1. 44 μ M, LOQ=4. 83 μ M and RSD=5. 26% were calculated and presented.

Acetohydroxamic Acid, CH3CONHOH,Forms Highly Stable Complexes With Vanadium (V) And Vanadium (IV) In 1:1, 1:2 And 1:3 Mole Ratios. The Stability of These Complexes Can Be Determined In Terms Of Thermodynamic parameters; ΔG, ΔH And ΔS, The Preliminary Data, Obtained Through Ph Titration At Various Temperatures, Was Processed And Analyzed By The Computer Program BEST For The Refinement Of Graphically Calculated Log b values. Graphs Of In b Versus L/t, Gave A Straight Line, With A Slope –ΔH/R And Intercept ΔS/R. Enthalpy And Free Energy Changes For V(V) Complexes Were Found In The Order Of M L > M L2 > M L3 With A Negative Sign. Whereas Entropy Change Was Found To Be In The Same Order But Positive, For Vanadium (IV) Acetohydroxamic Acid Complexes, The Order Of ΔG, ΔH And ΔS Was M L > ML3 > ML2. The ΔS Is Most Positive For A 1:1 Complex, While ΔG And ΔH Are More Negative For The Same.

Calculation of excess quantities of ethylene glycol + water binary fluid systems at seven absolute temperatures (293. 15 to 353. 15) K from experimentally determined values of density and shear viscosity were presented in previous work. The examination of related functions beside the quality of correlation from several equations on these experimental values has also been reported. Considering the quasi-equality between Arrhenius activation energy of viscosity Ea and the enthalpy of activation for viscous flow  H*, over with their individual's contribution separately we can define partial molar activation energy Ea1 and Ea2 for ethylene glycol with water respectively. Correlation between Arrhenius parameters also shows desirable Arrhenius temperature. Comparison to the vaporization temperature in the fluid vapor equilibrium, and the limiting corresponding partial quantities permit us to predict value of the boiling points of the pure constituents. New empirical equations to estimate the boiling point are developed.

In this research, geometrical structures of armchair single walled boron nitride nanotube (SWBNNT) andarmchair single walled aluminum nitride nanotube (SWAlNNT) were optimized by Density FunctionalTheory (DFT) in the gas phase, both having the same length of 5 angstrom and n=9, m=9. B3LYP/6-31G*level of theory have been used to determine and compare electronic properties, natural charge and chemicalshielding tensors of nanotubes. The chemical shielding tensors were calculated using GIAO method to obtainstructural information and dynamic behavior for optimal boron nitride and aluminum nitride nanotubestructures. Also, Thermodynamic functions for the boron nitride nanotube (9, 9-5) and the aluminum nitridenanotube (9, 9-5) in the gas phase were carried out with using the B3LYP method and 6-31g* basis set. It issignificant that all of NMR parameters and geometrical properties of both nanotubes were determined in 5layers.

In this work, the preparation of activated carbons from agricultural product, the fenugreek seeds by two approaches, chemical and microwave activation methods were studied. The characterization of carbon materials were carried out using different techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Thermo Gravimetric Analysis (TGA), X-Ray Diffraction (XRD). Adsorption experiment was carried out for the adsorption of two different basic dyes, Methylene Blue (MB) and Crystal Violet (CV) under varying conditions such as concentration, agitation time and temperature. The data acquired from concentration variation were found to fit well with Langmuir and also Freundlich isotherms. Kinetic studies revealed the fact that the system followed second order adsorption rate. Thermodynamic parameters such as Δ H≠ , Δ S≠ and Δ G≠ were calculated from the obtained data on adsorption at different temperature.