First principles surface thermodynamics of industrial supported catalysts in working conditions.

Ever stronger environmental concerns prompt the research in the area of heterogeneous catalysis to play an ever more crucial role to produce ever cleaner fuel from the refining of petroleum effluents. The catalytic active phase is often used in a dispersed state over a porous oxide material. This paper is a review of recent progress brought by periodic density functional theory (DFT) calculations in the area of two relevant industrial supported catalysts.

Detection of hemodynamic turbulence in experimental stenosis: an in vivo study in the rat carotid artery.

In a previous study, we have demonstrated that turbulences in arteries less than 1.5 mm in diameter perfused ex vivo by an oscillated flow can be determined using nonlinear mathematical models. The hypothesis tested here was that nonlinear analyses enable the in vivo detection of turbulences in blood flow in vessels with dimensions affected by microsurgery.

Nonlinear analysis of arterial oscillated flow in experimental stenosis and microsurgical anastomosis.

Background: Thrombotic vascular occlusion is one of the main complications that can occur during microsurgical anastomosis and is frequent when the blood becomes turbulent. The aim of this ex vivo study was to test the use of nonlinear mathematical tools to detect turbulence flow upstream and downstream of an arterial stenosis and of a microsurgical anastomosis technique in arteries with diameters in the range of microsurgical practice.

Materials And Methods: Rat carotid arteries (0.

[VCS microclip anastomosis on blood vessels of less than 2 millimeters in diameter. Preliminary experimental study in the rat].

The aim of this work was to study the possibilities and limits of the vascular microanastomoses with VCS microclips. VCS Microclips are a new mechanical anastomotic device, allowing a single operator to perform anastomoses without microsutures. The two arcuate limbs of the titanium microclips do not penetrate the vascular intima.

[Arterial phenomenon of autonomization of vascularized island flaps reviewed by expansion of the vascular pedicle. An experimental study in the rat].

This experimental study performed in rats examined the possible vascular extensions of a periprosthetic membrane neoflap with an axial vascular pedicle towards an adjacent cutaneous angiotome. 22 Wistar rats were operated. After tattooing the superficial iliac circumflex angiotome, the adjacent epigastric pedicle was expanded.