Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Bénédicte Samyn-PetitDubos Jean-Pierre WajdaFrédéric ChiratCoddeville BernadetteGrégory DemaizieresSibille FarrerMarie-Christine SlomiannyManfred TheisenPhilippe Delannoy
• Organismes : Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 Meristem Therapeutics Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 Meristem Therapeutics Meristem Therapeutics Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 Meristem Therapeutics Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576
• Publié dans European Journal of Biochemistry le 23/10/2020

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Résumé : We have compared the site-by-site N-glycosylation status of human lactoferrin (Lf) produced in maize, a monocotyledon, and in tobacco, used as a model dicotyledon. Maize and tobacco plants were stably transformed and recombinant Lf was purified from both seeds and leaves. N-glycopeptides were generated by trypsin digestion of recombinant Lf and purified by reverse-phase HPLC. The N-glycosylation pattern of each site was determined by mass spectrometry. Our results indicated that the N-glycosylation patterns of recombinant Lf produced in maize and tobacco share common structural features. In particular, both N-glycosylation sites of each recombinant Lf are mainly substituted by typical plant paucimannose-type N-glycans, with beta1,2-xylose and alpha1,3-linked fucose at the proximal N-acetylglucosamine. However, tobacco Lf shows a significant amount of processed N-glycans with one or two beta1,2GlcNAc linked to the trimannose core, which are weakly expressed in maize Lf. Finally, no Lewisa epitope was observed on tobacco Lf.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Tantely RandriambeloJean-Luc BaraySerge BaldyA. M. ThompsonS. OltmansPhilippe Keckhut
• Organismes : Laboratoire de l'Atmosphère et des Cyclones Laboratoire de l'Atmosphère et des Cyclones Laboratoire de l'Atmosphère et des Cyclones NASA Goddard Laboratory for Atmosphere NOAA Climate Monitoring and Diagnostics Laboratory Service d'aéronomie
• Publié dans Annales Geophysicae le 26/10/2020

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Résumé : Since 1998, a ground-based tropospheric ozone lidar has been running at Reunion Island and has been involved with a daily measurement campaign that was performed in the latter part of the biomass burning season, during November–December 1999. The averaged ozone profile obtained during November–December 1999 agrees well with the averaged ozone profile obtained from the ozonesondes launch at Reunion during November–December (1992– 2001). Comparing weekly sonde launches (part of the Southern Hemisphere Additional Ozonesondes: SHADOZ program) with the daily ground-based lidar observations shows that some striking features of the day-to-day variability profiles are not observed in the sonde measurements. Ozone profiles respond to the nature of disturbances which vary from one day to the next. The vertical ozone distribution at Reunion is examined as a function of prevailing atmospheric circulation. Back trajectories show that most of the enhanced ozone crossed over biomass burning and convectively active regions in Madagascar and the southern African continent. The analyses of the meteorological data show that ozone stratification profiles are in agreement with the movement of the synoptic situations in November–December 1999. Three different sequences of transport are explained using wind fields. The first sequence from 23 to 25 November is characterized by northerly transport; during the second sequence from 26 to 30 November, the air masses are influenced by meridional transport. The third sequence from 2 to 6 December is characterized by westerly transport associated with the sub-tropical jet stream. The large, standard deviations of lidar profiles in the middle and upper troposphere are in agreement with the upper wind variabilities which evidence passing ridge and trough disturbances. During the transition period between the dry season and the wet season, multiple ozone sources including stratosphere-troposphere exchanges, convection and biomass burning contribute to tropospheric ozone at Reunion Island through sporadic events characterized by a large spatial and temporal variability.

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Fichiers liés : angeo-21-2095-2003.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2003
• Auteurs : Cedric DumoulinPierre BouletJean-Luc DekeyserPhilippe Marquet
• Organismes : Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time

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Résumé : The development of embedded applications is very difficult. Several different languages are usually used to specify different parts of the application or of the hardware. Dealing with so many languages can be daunting. A separation of the preoccupations: application, hardware architecture, association between them and the simulation or execution technologies are keys to efficient co-design of embedded applications. The Model Driven Architecture can be used to better deal with the reuse of parts of the design and the interoperability between both the implementation technologies and the various simulation levels. par We propose a construction of metamodels to support a co-design methodology. This construction will be experimented on intensive signal processing application co-design to justify the adequacy of this methodology to usual industrial development techniques.

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2003
• Auteurs : Jean CorneloupPhilippe BourdeauPascal MaoEric Boutroy
• Organismes : Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Bernard GuyJalel Ben-OthmanLuc BouganimGérôme CanalsBruno DefudeJean FerriéStéphane GançarskiRachid GuerraouiPascal MolliPhilippe PucheralClaudia RoncancioPatricia Serrano-AlvaradoPatrick Valduriez
• Organismes : Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux Centre National de la Recherche Scientifique Parallélisme, Réseaux, Systèmes, Modélisation Secured and Mobile Information Systems Environment for cooperation Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux Centre National de la Recherche Scientifique Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier Ecole Polytechnique Fédérale de Lausanne Environment for cooperation Secured and Mobile Information Systems Laboratoire d'Informatique de Grenoble Laboratoire d'Informatique de Nantes Atlantique Scientific Data Management
• Publié dans Revue des Sciences et Technologies de l'Information - Série TSI : Technique et Science Informatiques le 31/10/2020

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Résumé : Ce document est le résultat d'un travail collectif réalisé par les membres de l'action spécifique CNRS « Mobilité/Accès aux données ». Il fait le point sur l'état d'avancement des travaux réalisés dans le domaine des bases de données mobiles et identifie quelques orientations de recherche jugées particulièrement pertinentes. Compte tenu de la largeur du domaine, ce document ne prétend cependant pas à l'exhaustivité. Après une classification des applications mobiles et une caractérisation de leur environnement d'exécution, les problématiques suivantes sont analysées : gestion des données de localisation, modèles d'accès aux données, cohérence des traitements et synchronisation de copies, gestion de données embarquées, confidentialité des données et enfin adaptabilité des infrastructures logicielles à la mobilité et à la déconnexion.

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Fichiers liés : AS-CNRS-EtatDelArtMobilite-TSI2003-Journal.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Jean-Philippe BétaJean-Pierre Cabestan
• Organismes : Université Panthéon-Assas Institut d'Asie Orientale
• Publié dans Contemporary Chinese Thought le 22/05/2023

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2003
• Auteurs : Jean MartinetYves ChiaramellaPhilippe MulhemIadh Ounis
• Organismes : FOX MIIRE Communication Langagière et Interaction Personne-Système Modélisation et Recherche d’Information Multimédia [Grenoble] School of Computing Science [Glasgow]

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Résumé : We present in this paper a relational approach for indexing and retrieving photographs from a collection. Instead of using simple keywords as an indexing language, we propose to use star-graphs as document descriptors. A star-graph is a conceptual graph that contains a single relation, with some concepts linked to it. They are elementary pieces of information describing combinations of concepts. We use star-graphs as descriptors - or index terms - for image content representation. This allows for relational indexing and expression of complex user needs, in comparison to classical text retrieval, where simple keywords are generally used as document descriptors. We present a document representation model, a weighting scheme for star-graphs inspired by the tf.idf used in text retrieval. We have applied our model to image retrieval, and show the system evaluation results.

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Fichiers liés : cbmi03-submitted.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Guillaume MorinFarid JuillotCorinne CasiotOdile BruneelJean-Christian PersonnéFrançoise Elbaz-PoulichetMarc LeblancPhilippe IldefonseGeorges Calas
• Organismes : Institut de minéralogie et de physique des milieux condensés Institut de minéralogie et de physique des milieux condensés Hydrosciences Montpellier Hydrosciences Montpellier Hydrosciences Montpellier Hydrosciences Montpellier Hydrosciences Montpellier Institut de minéralogie et de physique des milieux condensés Institut de minéralogie et de physique des milieux condensés
• Publié dans Environmental Science and Technology le 24/10/2020

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Résumé : The oxidation of Fe(II) in acid mine drainage (AMD) leads to the precipitation of Fe(III) compounds which may incorporate toxic elements, such as arsenic (As), within their structure or adsorb them at their surface, thus limiting their mobility. The present work provides evidence for spatial and seasonal variations of microbial activity that influence arsenite oxidation and As immobilization in the heavily contaminated AMD from the Carnoulès mine, Gard, France ([As III] = 80 to 280 mg·L-1 in the acidic spring draining the waste-pile). In the first tens of meters of the AMD, the rapid oxidation of Fe(II) leads to the coprecipitation of large amounts of As with Fe(III) in bacterial mats. XRD, XANES, and SEM analyses of sediments and stromatolite samples revealed the unusual formation of As(III)-rich compounds, especially nanocrystalline tooeleite, Fe6(AsO3)4(SO4)(OH)4·4H2O, a rare ferric arsenite sulfate oxy-hydroxide mineral, together with XRD-amorphous mixed As(III)/As(V)-Fe(III) oxy-hydroxide compounds. In the wet season, the suspended sediments of the upstream zone essentially consist of tooeleite associated with am-As(III)-Fe(III) oxy-hydroxides, while am-As(V)-Fe(III) oxy-hydroxides, having As:Fe molar ratios as high as 0.6-0.8, dominate in the dry season. Comparing natural and bioassay samples revealed that the formation of As(III)-rich compounds in the wet season may be related to the metabolic activity of bacterial strains able to oxidize Fe(II) but not As(III). One of these strains, having an Acidithiobacillus ferrooxidans genotype, has been isolated from the Carnoulès AMD. In contrast, the formation of As(V)-rich compounds in the dry season can be related to both biotic and abiotic oxidation of As(III) to As(V). Some Thiomonas strains isolated from the Carnoulès AMD were shown to be able to catalyze the oxidation of As(III) to As(V) in solution. Therefore, they can promote the formation of mixed As(V)-Fe(III) oxy-hydroxides, provided enough Fe(II) oxidizes. These results yield a better understanding of natural processes at this site and may help in designing efficient As-removal processes.

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Fichiers liés : Morin et al 2003.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Nicolas MercierNicolas MercierPierre FrèrePhilippe BlanchardJean RoncaliMagali AllainChristophe PasquierAmédée Riou
• Organismes : Laboratoire de Physique des Solides - HP
• Publié dans Inorganic Chemistry le 31/10/2020

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Résumé : 2,2′-bithiophene derivatives, 5-ammoniumethylsulfanyl-2,2′-bithiophene (AESBT) and 5,5′-bis(ammoniumethylsulfanyl)-2,2′-bithiophene (BAESBT), have been designed for their incorporation in organic-inorganic materials based on iodometalates. Three layered compounds, (BAESBT)Pbl4, (AESBT) 4Pb3l10, and (AESBT)3Bl 2l9, have been synthesized as crystals from slowly cooled aqueous solution containing metal halide and bithiophene derivative salts. When starting from the diammonium cation, (BAESBT)Pbl4 hybrid perovskite is obtained. (BAESBT)Pbl4 adopts a triclinic cell (P1̄) with the lattice parameters a = 8.4741(5) Å, b = 8.9255(6) Å, c = 16.876(1) Å, α = 88.328(5)°, β = 81.806(4)°, γ = 88.864(5)°, Z = 2. In the structure, Pbl42- perovskite sheets and diammonium cation layers alternate along c. The incorporation of the corresponding monoammonium cation (AESBT) leads to a head to tail arrangement of the molecules in the (AESBT)4Pb 3l10 hybrid, precluding the formation of the perovskite layers. (AESBT)4Pb3l10 is orthorhombic, Pna21, with a = 38.333(4) Å, b = 22.239(3) Å, c = 8.448(2) Å, Z = 4. The structure consists of corrugated layers of Pb 3l104- separated by organic layers of monoammonium cations. A similar relative situation of molecules in organic layers is observed in (AESBT)3Bi2l9, with the inorganic sheets being built up from Bi2l93- entities. (AESBT)3Bi2l9 crystallizes in an orthorhombic cell (P212121) with a = 8.4564(6) Å, b = 21.368(2) Å, c = 30.747(2) Å, Z = 4. In the three compounds, the molecular packings appear different, underlining the interplay between both organic and inorganic components. New packings are stabilized, as illustrated by an original mixed kappa-alpha type arrangement of the bithiophene units in (AESBT)3Bi2l9. Furthermore, molecular interactions, especially of S...S type, appear stronger in the hybrids based on the monoammonium cations. The electrical conductivity of a (BAESBT)Pbl4 single crystal has also been investigated, revealing a semiconductive behavior with a characteristic energy of E g = 2.535 eV.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Thierry PellarinWigneron J.-P.Jean-Christophe CalvetPhilippe Waldteufel
• Organismes : Centre national de recherches météorologiques Unité de bioclimatologie Centre national de recherches météorologiques Institut Pierre-Simon-Laplace
• Publié dans Journal of Geophysical Research le 01/11/2020

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Résumé : A technique to retrieve surface soil moisture was assessed at the global scale using a synthetic data set of L-band (1.4 GHz) brightness temperatures T-B for 2 years, 1987 and 1988. The global T-B database consists of half-degree continental pixels and accounts for within-pixel heterogeneity, on the basis of 1 km resolution land cover maps. The retrievals were performed using a three-parameter inversion method applied to the L-band Microwave Emission of Biosphere model ( L-MEB). Three land surface variables were retrieved simultaneously from the multiangular and dual-polarization T-B data: surface soil moisture wg, vegetation optical depth tau, and surface temperature T-S. The retrievals were obtained in two T-S configurations: T-S was either unknown or known with an uncertainty of 2 K. Applying these two assumptions, global maps of the estimated accuracy of the wg retrievals were produced, and the capability of the T-B to monitor wg was evaluated. A sensitivity study was carried out in order to analyze the effect of the main parameters that may affect the retrieval accuracy: the fraction cover of open water and forests, frozen soil conditions, and the radiometric noise on T-B. These results contribute to the better definition of the potential of the observations from future spaceborne missions such as the Soil Moisture and Ocean Salinity ( SMOS) project.

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Fichiers liés : 2002JD003086.pdf

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