risk-based assessment methods are commonly used at the contaminated sites by hydrocarbon pollutants. this paper presents the results of a two-dimensional finite volume model of reactive transport of biodegradable btex which have been developed for the saturated zone of an unconfined aquifer in the pump station area of tehran oil refinery, iran. the model governing equations were numerically sol...

In most of the real life problems, we encounter with nonlinear differential equations. Problems are made more understandable by modeling them these this way, it becomes easier to interpret problems and reach results. 1913, basic enzymatic reaction model introduced Michaelis Menten describe enzyme processes is an example equation. This one simplest best-known approaches mechanisms used enzyme-ca...

This paper summarizes our present theoretical understanding of single-molecule kinetics associated with the Michaelis-Menten mechanism of enzymatic reactions. Single-molecule enzymatic turnover experiments typically measure the probability density f(t) of the stochastic waiting time t for individual turnovers. While f(t) can be reconciled with ensemble kinetics, it contains more information tha...

Catalytic isomerization of glucose to fructose by immobilized glucose isomerase in an aqueous-ethanol medium was studied. Using Michaelis-Menten equation and Haldane relationship, the main kinetic parameters were determined: Kmf, Vmf, Kmr, Vmr. By comparing the aqueous-ethanol medium with an aqueous solution, the measured values of Kmr and Kmf were increased in the aqueous-ethanol solution, whi...

A mathematical model of reaction-diffusion problem with Michaelis-Menten kinetics in catalyst particles arbitrary shape is investigated. Analytical expressions the concentration substrates are derived as functions Thiele modulus, modified Sherwood number, and Michaelis constant. Taylor series approach Akbari-Ganji's method utilized to determine substrate effectiveness factor. The effects factor...

We study chemical reactions with complex mechanisms under two assumptions: (i) intermediates are present in small amounts (this is the quasi-steady-state hypothesis or QSS) and (ii) they are in equilibrium relations with substrates (this is the quasiequilibrium hypothesis or QE). Under these assumptions, we prove the generalized mass action law together with the basic relations between kinetic ...