2 documentos corresponden a la consulta.
Palabras contadas: arrhenius: 5
Kormes, D.J. - Cortón, E.
Sensors 2009;9(3):1599-1608
2009
Temas: Activation energy - Arrhenius plot - Biosensors - Glucose transport - Microbial metabolism - Saccharomyces cerevisiae - Analytical tool - Cellular membranes - Glucose concentration - Glucose transport
Descripción: Whereas biosensors have been usually proposed as analytical tools, used to investigate the surrounding media pursuing an analytical answer, we have used a biosensor-like device to characterize the microbial cells immobilized on it. We have studied the kinetics of transport and degradation of glucose at different concentrations and temperatures. When glucose concentrations of 15 and 1.5 mM were assayed, calculated activation energies were 25.2 and 18.4 kcal mol-1, respectively, in good agreement with previously published data. The opportunity and convenience of using Arrhenius plots to estimate the activation energy in metabolic-related processes is also discussed. © 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.
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Longinotti, M.P. - Carignano, M.A. - Szleifer, I. - Corti, H.R.
J Chem Phys 2011;134(24)
2011
Temas: Arrhenius - Dynamic property - Isobaric heat capacity - Low temperatures - Molecular dynamic simulations - NaCl aqueous solution - Salt concentration - Supercooled water - Temperature dependence - Temperature values
Descripción: In this work we studied the effect of NaCl on the thermodynamic and dynamic properties of supercooled water, for salt concentrations between 0.19 and 1.33mol kg-1, using molecular dynamic simulations for TIP5PE water model and ion parameters specially designed to be used in combination with this potential. We studied the isobaric heat capacity (Cp) temperature dependence and observed a maximum in Cp, occurring at Tm, that moves to lower temperature values with increasing salt concentration. Many characteristic changes were observed at scaled temperature TTm ∼ 0.96, namely a minimum in the density of the system, a reduction of the slope of the number of hydrogen bonds vs. temperature, and a crossover from Vogel-Tamman-Fulcher to Arrhenius dynamics. Finally, at low temperatures we observed that water dynamics become heterogeneous with an apparently common relationship between the fraction of immobile molecules and T/Tm for all studied systems. © 2011 American Institute of Physics.
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