Introduction: Many kinetic studies have shown that sorption of metals on natural materials results in the formation of metal precipitates. However, the influence of temperature on the kinetic formation of these metal precipitates has not been studied. The effect of temperature on reaction rates is well known and important in understanding reaction mechanisms. For most reactions, the increase in...

A recent paper published by Nieves-Morión and colleagues proposes that the intercellular transfer of small molecules in heterocyst-forming cyanobacteria (calcein, 5-carboxyfluorescein [5-CF], and esculin) is mediated by simple diffusion based on the Q10 values of the kinetics (1). In this letter, we show our analysis of their results to provide a thermodynamic basis of the kinetics. We obtained...

The internal rotations around the some within a ylide involving theophylline has been studied using the dynamic 1H NMR spectroscopic technique in different temperatures. The kinetic and activation quantities were calculated. Arrhenius, Eyring and classic methods were applied for isomers. compared for carbon-carbon double, carbon-carbon single bond for Z isomer. The results obtained by classic m...

Climatologies of streamer events derived from a transport model and a coupled chemistry-climate model V. Eyring, M. Dameris, V. Grewe, I. Langbein, and W. Kouker DLR Institut für Physik der Atmosphäre, Oberpfaffenhofen, D-82234 Wessling, Germany Forschungszentrum Karlsruhe, Institut für Meteorologie und Klimaforschung, 76344 Eggenstein-Leopoldshafen, Germany Received: 17 October 2002 – Accepted...

The electrical conductivities of the dilute solutions containing ionic liquids (1-hexyl-3-methylimidazolium chloride [Hmim]Cl, 1-hexyl-3-methylimidazolium bromide [Hmim]Br, and iodide [Hmim]I) with water isopropanol were determined in temperature ranging from 293.15 to 313.15 K. liquid densities all binary mixtures further for model parameterization. In theoretical modeling, limiting molar Λ0(T...

the kinetics and mechanism of the reaction between benzaldehyde 1, malononitrile 2 and dimedone 3 in a mixture of ethanol and water as solvents in the presence of fructose as a biodegradable catalyst has been studied by the spectroscopic method (uv-vis spectrophotometry method). the influence of various parameters (temperature, solvent and concentration) was studied on the reaction by means of ...

The acoustical comfort is now a comfort’s criterion which is taken into from the conception. The designers need therefore accurate tools to predict the acoustic quality of enclosures. Most of the acoustical comfort criteria are based on the reverberation time. When the room has proportionate dimensions and an uniform absorption, the statistical theory through Sabine or Eyring formulas allows go...