in this research, rehydration behavior of dried figs was studied at different temperatures (25, 60, 70, 80, and 90°c). the rehydration kinetic was examined using the four most frequently used empirical models, namely, weibull, peleg, first-order, and exponential association models. the weibull model gave the highest coefficient of determination (r2) and the lowest values of root mean square err...

The sensitivity of molecular vibrational population dynamics, governing the CO laser operated in fundamental and overtone transitions, to vibration-tovibration rate constants is investigated. With this aim, three rate constant sets have been used, differing in their completeness (i.e. accounting for singlequantum exchange only, or for multi-quantum exchange with a limited number of rate constan...

A new plot is described for analysing the results of kinetic experiments in which the Michaelis-Menten equation is obeyed. Observations are plotted as lines in parameter space, instead of points in observation space. With appropriate modifications the plot is applicable to most problems of interest to the enzyme kineticist. It has the following advantages over traditional methods of plotting ki...

Biomolecular interactions may be defined at several levels. The simplest quantitative descriptor, affinity, is defined by the affinity constant, KD, a measure of the strength of binding at equilibrium. This term may be further resolved into kinetic descriptors of rate of association (defined by the association rate constant (ka) and dissociation (kd). Kinetic information, however, does not reve...

The kinetics of the ozonation of three phenolic acids is investigated from ozone absorption experiments in a semi-continuous reactor. After the evaluation of stoichiometric ratios for the individual reactions between ozone and each phenolic acid, the oxidation of p-hydroxybenzoic acid by ozone is performed in a first stage. The influence of the operating variables on the degradation process is ...

The effect of Y2O3, CeO2, P2O5, ZrO2 and TiO2 in single, double and triple form on crystallization mechanism of Li2OAl2O3- SiO2(LAS) glass-ceramic system was investigated .The nucleation and crystallization peak temperatures of optimized samples in each group were determined by Ray & Day method .The crystalline phase was determined by the X-ray diffractometery .The micro-structure of the sample...

The use of the integrated rate expression for the estimation of kinetic parameters has been tested with the lactate dehydrogenase-catalyzed reduction of pyruvate by reduced nicotinamide adenine dinucleotide at various pH values. The results show good internal precision and the results of duplicate determinations indicate that the results can be replicated satisfactorily. The values of kinetic c...

the removal of as(iii) ions from aqueous solutions has been investigated using silica ceramic under different experimental conditions of initial arsenite concentration, adsorbent dose, temperature and ph. better removal was obtained at temperature 25âºc and ph 7.5. the adsorption data have been explained in terms of langmuir and freundlich equations. the sorption kinetics was tested for the pse...