A low-cost high-quality system for the acquisition and digital processing of images of WEFAX type provided by meteorological geostationary satellites

International audienceA low-cost high-quality system for the processing of satellite data received in the WEFAX analogue format is presented. It is composed of a receiver with its antenna connected to a personal computer with digitizing and graphic boards. The software automatically performs the storage of data onto the hard disk, contrast enhancement and false colour display, accurate navigation and animation loops. Interactive features are also available. Such a system is of great use in meteorological education, in weather forecasting and in environmental research. Taking into account the peculiarities of the WEFAX format, some algorithms have been devised lo correct for atmospheric depletion. Ground albedo can therefore be evaluated accurately on a pixel basis as well as global irradiation, cloud coverage and atmospheric global transmission

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Centre de Télédétection et d'Analyse des Milieux Naturel

A Jean-Claude et Thérèse,

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Reply to Comments on "A Semi-Analytical Model of High-Permittivity Dielectric Ring Resonators for Magnetic Resonance Imaging"

Comments about the above article [1] were proposed. We thank and reply to the authors of the comments about our model of high-permittivity dielectric ring resonators used as microscopy magnetic resonance probes. In this prospect, we reply part by part to the comments

ZHOUPI and KERBEROS mediate embryo/endosperm separation by promoting the formation of an extracuticular sheath at the embryo surface

Arabidopsis thaliana seed development requires the concomitant development of two zygotic compartments, the embryo and the endosperm. Following fertilization, the endosperm expands and the embryo grows invasively through the endosperm, which breaks down. Here, we describe a structure we refer to as the embryo sheath that forms on the surface of the embryo as it starts to elongate. The sheath is deposited outside the embryonic cuticle and incorporates endosperm-derived material rich in extensin-like molecules. Sheath production is dependent upon the activity of ZHOUPI, an endosperm-specific transcription factor necessary for endosperm degradation, embryo growth, embryo-endosperm separation, and normal embryo cuticle formation. We show that the peptide KERBEROS, whose expression is ZHOUPI dependent, is necessary both for the formation of a normal embryo sheath and for embryo-endosperm separation. Finally, we show that the receptor-like kinases GSO1 and GSO2 are required for sheath deposition at the embryo surface but not for production of sheath material in the endosperm. We present a model in which sheath formation depends on the coordinated production of material in the endosperm and signaling within the embryo, highlighting the complex molecular interaction between these two tissues during early seed development.International Mobility Programme to Strengthen Skills and Excellence in Research for Agricultur

Reply to Comments on "A Semi-Analytical Model of High-Permittivity Dielectric Ring Resonators for Magnetic Resonance Imaging"

Comments about the above article [1] were proposed. We thank and reply to the authors of the comments about our model of high-permittivity dielectric ring resonators used as microscopy magnetic resonance probes. In this prospect, we reply part by part to the comments.Radiolog