Contrast Enhancement of UV Absorption and Improved Biochip Imaging

International audienceBiochip using UV absorption for selective DNA or proteins imaging may take advantage of sensitivity enhancement thanks to either multilayer structures or grating structures. We discuss the interest of coupled angular and spectral illumination

Supercritical Extraction and Separation of Antioxidants from Residues of the Wine Industry

AbstractThe main objective of this research is to evaluate the possibility to use residues of the wine industry to produce antioxidant concentrates, more specifically, concentrates of gallic acid, catechin, epicatechin and resveratrol. For this purpose, Supercritical Antisolvent Fractionation (SAF) has been used. This technology allows to concentrate ina dry form the biologically active principles of interest for their direct application, providing simultaneously a uniform and suitable size of the product. The most abundant compounds recovered are cathechin (48.5mg/Kg, epicathechin (36.3mg/kg), gallic acid (108mg/Kg) and resveratrol (170mg/Kg)

Light-ion beam for microelectronic applications

In this paper we describe the structure and the composition of (Al,Ga)N/GaN Bragg reflectors obtained from Rutherford backscattering spectroscopy. Bragg reflectors constitute a part of blue ($\lambda$ = 450 nm) resonant cavity light emitting diodes. To improve the measurement accuracy, three tilt angles have been used (10\degres, 25\degres and 50\degres). In a second part of the paper, ion beam induced charges study has been carried out, with a 2 MeV $^4$He$^+$ micro-beam, on metal–semiconductor–metal UV photodetectors. Results have been taken into account for the design of the photodetector electrodes