A method based on the rate of depletion of a nutrient from solution was developed to characterize nutrient flux of plant roots. Nutrient concentration of the solution was measured at a series of time intervals to describe the complete depletion curve. An integrated rate equation, based on a Michaelis-Menten model, was developed and fit to the data of the depletion curve using a least-square pro...

We construct efficient designs for the Michaelis-Menten enzyme kinetic model capable of checking model assumption. An extended model, called EMAX model is also considered for this purpose. This model is widely used in pharmacokinetics and reduces to the MichaelisMenten model for a specific choice of the parameter setting. Our strategy is to find efficient designs for estimating the parameters i...

Enzymatic inhibition is one of the key regulatory mechanisms in cellular metabolism, especially enzymatic competitive by product. This process helps cell regulate activities. In this paper, we derive a mathematical model describing The consists coupled system nonlinear ordinary differential equations for species interest. Using nondimensionalization analysis, formula product formation rate mech...

microbiological analyses of soil chronically exposed to petroleum complex compounds of some oil springs in south of iran resulted in isolation and purification of a new native thermophilic strain which is capable to desulfurize petroleum sulfur compounds by 4-s mechanism. dibenzothiophene (dbt) was selected as a complex sulfur compound model and many experiments were done to identify the metabo...