We revisit the problem of pinning a reaction-diffusion front by defect, in particular reaction-free region. Using collective variables for and numerical simulations, we compare behaviors bistable monostable front. A can be pinned as confirmed criterion, analysis time independant simulations. Conversely, never pinned, it gives rise to secondary pulse past defect calculate this takes appear. Thes...

The kinetic of the heterogeneous chemical reaction of aluminum hydroxide and fluosilicic acid was studied. It was found that the diffusion of the reactants through the porous silica coating to the aluminum hydroxide surface and the interfacial chemical reaction between the diffusing reactant and aluminum hydroxide platelets control the overall reaction rate. These two phenomena were studied...

Background & Aims: The production of extended-spectrum-β-lactamases (ESBLs) is the main mechanism of resistance to β-lactam antibiotics. The outbreak of isolates simultaneously possessing several resistance mechanisms to β-lactam antibiotics caused a decrease in sensitivity of the confirmatory tests for ESBL. The aim of this study was the evaluation of the β-lactamase disk test...