Here, we study and compare the mechanisms of action of the GroEL/GroES and the TRiC chaperonin systems on MreB client protein variants extracted from E. coli. MreB is a homologue to actin in prokaryotes. Single-molecule fluorescence correlation spectroscopy (FCS) and time-resolved fluorescence polarization anisotropy report the binding interaction of folding MreB with GroEL, GroES and TRiC.
We study a model for compressible multiphase flows involving N non miscible phases where N is arbitrary. This model boils down to the Baer-Nunziato model when N = 2. For the barotropic version of model, and for more general equations of state, we prove the weak hyperbolicity property , the convexity of the natural phasic entropies, and the existence of a symmetric form.
Ce travail propose un modèle de comportement thermomécanique quasi - incompressible basé sur la thermo dynamique des milieux irréversibles et sur l’introduction d’une forme mixte de l’énergie libre. Nous y présentons également une formulation variationnelle associée pour une résolution monolithique des équations d’équilibres thermique et mécanique.
Modeling soil evaporation has been a notorious challenge due to the complexity of the phenomenon and the lack of data to constrain it. In this context, a parsimonious model is developed to estimate soil evaporative efficiency (SEE) defined as the ratio of actual to potential soil evaporation.
Fluorescence microscopy is widely used in biological imaging, however scattering from tissues strongly limits its applicability to a shallow depth. In this work we adapt a methodology inspired from stellar speckle interferometry, and exploit the optical memory effect to enable fluorescence microscopy through a turbid layer.
We report on a numerical optimization of the laser induced damage threshold of multi-dielectric high reflection mirrors in the sub-picosecond regime. We highlight the interplay between the electric field distribution, refractive index and intrinsic laser induced damage threshold of the materials on the overall laser induced damage threshold (LIDT) of the multilayer.
A nonlinear inverse scattering problem is solved to retrieve the permittivity maps inside a microwave cylindrical scanner of circular cross-section. In this article, we show how we can improve this minimization scheme by taking advantage of several a priori pieces of information.
We discuss the characterization of two-dimensional targets based on their diffracted intensity. The target characterization is performed by minimizing an adequate cost functional, combined with a level-set representation if the target is homogeneous. One key issue in this minimization is the choice of an updating direction, which involves the gradient of the cost functional.
An extension of the level set representation is proposed for the reconstruction of the unknown cross-section of multiple phase material obstacles embedded in an homogeneous medium and illuminated by time-harmonic electromagnetic line sources. The a priori information assumed therein is that the scatterers are homogeneous by parts and of known characteristics. Two types of approaches are discussed with their pros and cons.
A free-space methodology specifically designed for characterizing inhomogeneous magneto-dielectric materials is presented. The associated modeling is performed with the finite-element method combined with the Born linearized approximation even if the dielectric constants of the materials are known to be large. Due to the introduction of a metallic element, a decoupling of the magnetic and dielectric effects is encountered.