We investigate noise-induced pattern formation in a model of cancer growth based on Michaelis-Menten kinetics, subject to additive and multiplicative noises. We analyse stability properties of the system and discuss the role of diffusion and noises in the system’s dynamics. We find that random dichotomous fluctuations in the immune response intensity along with Gaussian environmental noise lead...

This paper reports the covalent immobilization of penicillin G acylase from E. coli on sepabeads EC-EP, an epoxy-activated polymethacrylic carrier, and describes kinetic properties of the immobilized enzyme. The selected enzyme belongs to a class of biocatalysts whose industrial interest is due to their versatility to mediate hydrolysis of penicillins and semi-synthetic β−lactam antibiotics syn...

Typically degradation of a pesticide is a biotic process, however, there are abiotic degradation processes as well. The latter include photodegradation (that can produce a wild array of products) and various types of chemical degradation processes. Restricting degradation to the soil interior (no photodegradation component) and assuming negligible chemical degradation, pesticide degradation is ...

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...

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...