Mixed-mode oscillations and chaos in a complex chemical reaction network involving heterogeneous catalysis.

The nonlinear dynamical behavior in a complex isothermal reaction network involving heterogeneous catalysis is studied. The method first determines the multiple steady states in the reaction network. This is followed by an analysis of bifurcation continuations to identify several kinds of bifurcations, including limit point, Bogdanov-Takens, generalized Hopf, period doubling, and generalized period doubling.

Numerical analysis of an immunochromatographic test strip reader in abused drugs screening.

A point-of-care immunoassay strip reader, Uniscan™, was applied to detect methamphetamine, opiate, and marijuana in human urine by providing numerical apparent drug concentrations. Calibration curves were determined by a nonlinear regression. The cutoff was verified using spiked controls.

Computational multiple steady states for enzymatic esterification of ethanol and oleic acid in an isothermal CSTR.

The capacity of complex biochemical reaction networks (consisting of 11 coupled non-linear ordinary differential equations) to show multiple steady states, was investigated. The system involved esterification of ethanol and oleic acid by lipase in an isothermal continuous stirred tank reactor (CSTR). The Deficiency One Algorithm and the Subnetwork Analysis were applied to determine the steady state multiplicity.

Removal of reactive dye from wastewater by adsorption using ECH cross-linked chitosan beads as medium.

The feasibility of the removal of reactive dye from wastewater using a novel adsorbent, ECH cross-linked chitosan beads, as medium was examined. The effect of the pH and the initial concentration of the dye (RR222) solution on the adsorption capacity of the ECH cross-linked chitosan beads were also investigated. It was found that the initial dye concentration and the pH of the solution significantly affected the adsorption capacity.

Equilibrium and kinetic modeling of adsorption of reactive dye on cross-linked chitosan beads.

The adsorption of reactive dye (Reactive Red 189) from aqueous solutions on cross-linked chitosan beads was studied in a batch system. The equilibrium isotherms at different particle sizes (2.3-2.