Large deviations from the behavior predicted by the Butler-Volmer equation of electrochemistry are accounted for using mesoscopic nonequilibrium thermodynamics. The nonequilibrium thermodynamic hypotheses are extended to include velocity space and cope with imperfect reactant transport leading to departures from Butler-Volmer behavior. This results in a modified Butler-Volmer equation in good a...

Based on the Volmer-Heyrovsky-Tafel mechanism, Frumkin adsorption and thermodynamic data of hydrogen (deuterium) absorption in Pd, effects of surface parameters on the hydrogen (deuterium) loading ratio into Pd in the hydrogen (deuterium) evolution reaction are discussed. There is a change of mechanism from the Volmer-Tafel route to the Volmer-Heyrovsky route when the current density rises, and...

Received 2 September 2003; revised 9 February 2004; accepted 7 May 2004 Fluorescence quenching of anthracene by aniline in five different solvents has been carried out at room temperature with a view to understand the quenching mechanisms. Experimental results show positive deviation in the Stern-Volmer plots in all the solvents studied. In order to interpret these results the ground state comp...

Structural conformation of proteins can be determined using spectroscopic measurements. Fluorescence activity of proteins is one of the primary criterions for studying biophysical characteristics. Structural elucidation of proteins is important for drug developments.Fluorescence quenching of Cytochrome C, Myoglobin and Leghemoglobin were carried out using acrylamide and Potassium Iodide (KI) so...

We present a detailed mechanistic study of HER at the sulfur vacancy VS 2H–MoS2. evaluate Volmer, Tafel, and Heyrovsky transition states for different possible reaction steps, determining activation energy as function electrochemical potential via grand-canonical density functional theory. The results show that Volmer steps depend on energies decrease more negative potentials, while this is not...

The interaction between a bioactive molecule, 3-acetyl-4-oxo-6,7-dihydro-12H indolo-[2,3-a] quinolizine (AODIQ), with human serum albumin (HSA) has been studied using steady-state absorption and fluorescence techniques. A 1 : 1 complex formation has been established and the binding constant (K) and free energy change for the process have been reported. The AODIQ–HSA complex results in fluoresce...

three new rimantadine schiff bases (rsbs) were prepared, and then the interaction of rsbs with bovine serum albumin (bsa) was investigated using fluorescence, synchronous fluorescence, uv-vis absorption spectroscopy under physiological conditions. the results showed that the three rsbs effectively quenched the intrinsic fluorescence of bsa via static quenching. binding constant (ka), number of ...

Polarization measurement is one of the major electrochemical methods used by electrochemists. The changes in current/potential with time at constant potential/current are investigated. outcomes these observations can be to plot a current–potential curve. Therefore, it important understand relationship between three parameters: electrode potential, current, and time. In this paper, we described ...

The quenching by molecular oxygen of the fluorescence from a protoporphyrin IX adduct of horseradish peroxidase has been investigated using both intensity and time-resolved techniques. The bimolecular quenching rate constant determined for this process, as evaluated by the conventional Stern-Volmer analysis, was 2 x 10(8) M-1 s-1, among the lowest observed for protein systems. This result sugge...

background some herbal anticancer agents have direct interactions with dna. objectives the present study aimed to investigate the interaction of ctdna with rosemary flowers. materials and methods we used uv-vis, fluorescence and circular dichroism (cd) spectroscopic techniques. results the absorption of dna at 260 nm increased on addition of rosemary. herb extract quench the fluorescence of etb...