Philippe JEAN-PIERRE

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• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2008
• Auteurs : Jean-Pierre AugustinPhilippe BourdeauLoïc Ravenel
• Organismes : Aménagement, Développement, Environnement, Santé et Sociétés Pacte, Laboratoire de sciences sociales Théoriser et modéliser pour aménager (UMR 6049)

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2008
• Auteurs : Ricardo Aaron Chavez MontesPhilippe RanochaYves MartinezZoran MinicLise L. JouaninMélanie MarquisLuc SaulnierLynette FultonChristopher CobbettFrédérique BittonJean-Pierre J.-P. RenouAlain JauneauDeborah Goffner
• Organismes : Laboratoire de Recherche en Sciences Végétales Surfaces Cellulaires et Signalisation chez les Végétaux Laboratoire de Recherche en Sciences Végétales Laboratoire de biologie cellulaire et moléculaire Department of Chemistry Laboratoire de biologie cellulaire et moléculaire Unité de recherche sur les Biopolymères, Interactions Assemblages Unité de recherche sur les Biopolymères, Interactions Assemblages University of Melbourne Technische Universität Munchen = Technical University Munich = Université Technique de Munich University of Melbourne Unité de recherche en génomique végétale Unité de recherche en génomique végétale Laboratoire de Recherche en Sciences Végétales Laboratoire de Recherche en Sciences Végétales
• Publié dans Plant Physiology le 31/10/2020

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Résumé : Although cell wall remodeling is an essential feature of plant growth and development, the underlying molecular mechanisms are poorly understood. This work describes the characterization of Arabidopsis (Arabidopsis thaliana) plants with altered expression of ARAF1, a bifunctional alpha-L-arabinofuranosidase/beta-D-xylosidase (At3g10740) belonging to family 51 glycosyl-hydrolases. ARAF1 was localized in several cell types in the vascular system of roots and stems, including xylem vessels and parenchyma cells surrounding the vessels, the cambium, and the phloem. araf1 T-DNA insertional mutants showed no visible phenotype, whereas transgenic plants that overexpressed ARAF1 exhibited a delay in inflorescence emergence and altered stem architecture. Although global monosaccharide analysis indicated only slight differences in cell wall composition in both mutant and over-expressing lines, immunolocalization experiments using anti-arabinan (LM6) and anti-xylan (LM10) antibodies indicated cell type-specific alterations in cell wall structure. In araf1 mutants, an increase in LM6 signal intensity was observed in the phloem, cambium, and xylem parenchyma in stems and roots, largely coinciding with ARAF1 expression sites. The ectopic overexpression of ARAF1 resulted in an increase in LM10 labeling in the secondary walls of interfascicular fibers and xylem vessels. The combined ARAF1 gene expression and immunolocalization studies suggest that arabinan-containing pectins are potential in vivo substrates of ARAF1 in Arabidopsis.

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• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2008
• Auteurs : Philippe Saltel
• Organismes : Philosophie, Langages et Cognition

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2008
• Auteurs : Philippe LericheDavid AillerieSophie RoquetMagali AllainAntonio CravinoPierre FrèreJean Roncali
• Organismes : MOLTECH-Anjou MOLTECH-Anjou MOLTECH-Anjou MOLTECH-Anjou MOLTECH-Anjou
• Publié dans Organic & Biomolecular Chemistry le 02/11/2020

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Résumé :

3D-conjugated systems based on oligothiophene segments grafted on a phosphorus or on a phosphine oxide node have been synthesized. Under Stille coupling conditions, bromide terminated thienyl phosphine derivatives undergo a breaking of the phosphorus–carbon bond attributed to a ligand exchange with the Pd catalyst. The electronic properties of the new compounds have been analyzed by UV-vis and fluorescence spectroscopy and cyclic voltammetry.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2008
• Auteurs : Daniel SauvantPhilippe SchmidelyJean-Jacques DaudinNormand R. St-Pierre
• Organismes : Physiologie de la Nutrition et Alimentation Physiologie de la Nutrition et Alimentation Mathématiques et Informatique Appliquées Department of Animal Sciences
• Publié dans Animal le 26/10/2020

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Résumé : Research in animal sciences, especially nutrition, increasingly requires processing and modeling of databases. In certain areas of research, the number of publications and results per publications is increasing, thus periodically requiring quantitative summarizations of literature data. In such instances, statistical methods dealing with the analysis of summary (literature) data, known as meta-analyses, must be used. The implementation of a meta-analysis is done in several phases. The first phase concerns the definition of the study objectives and the identification of the criteria to be used in the selection of prior publications to be used in the construction of the database. Publications must be scrupulously evaluated before being entered into the database. During this phase, it is important to carefully encode each record with pertinent descriptive attributes (experiments, treatments, etc.) to serve as important reference points for the rest of the analysis. Databases from literature data are inherently unbalanced statistically, leading to considerable analytical and interpretation difficulties; missing data are frequent, and data structures are not the outcomes of a classical experimental system. An initial graphical examination of the data is recommended to enhance a global view as well as to identify specific relationships to be investigated. This phase is followed by a study of the meta-system made up of the database to be interpreted. These steps condition the definition of the applied statistical model. Variance decomposition must account for inter- and intrastudy Sources; dependent and independent variables must be identified either as discrete (qualitative) or continuous (quantitative). Effects must be defined as either fixed or random. Often, observations must be weighed to account for differences in the precision of the reported means. Once model parameters are estimated, extensive analyses of residual variations must be performed. The roles of the different treatments and studies in the results obtained must be identified. Often, this requires returning to an earlier step in the process. Thus, meta-analyses have inherent heuristic qualities.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2008
• Auteurs : Angèle RicolleauGuillaume FiquetAhmed AddadN. MenguyChristiaian VanniJean-Philippe PerrillatIsabelle DanielHervé CardonNicolas Guignot
• Organismes : Institut de minéralogie et de physique des milieux condensés Institut de Physique du Globe de Paris Institut de minéralogie et de physique des milieux condensés Laboratoire de structures et propriétés de l'état solide - UMR 8008 Institut de minéralogie et de physique des milieux condensés Institut de Physique du Globe de Paris Centre Pluridisciplinaire de Microscopie Electronique et de Microanalyse Laboratoire de Sciences de la Terre Laboratoire de Sciences de la Terre Laboratoire de Sciences de la Terre European Synchrotron Radiation Facility
• Publié dans The American Mineralogist le 31/10/2020

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Résumé : Natural mid-ocean ridge basalt (MORB) samples recovered from diamond-anvil cell (DAC) experiments performed between 33 to 89 GPa and 1700 to 2600 K were studied with a transmission electron microscope (TEM). We used the focused ion beam (FIB) lift-out technique to prepare the recovered high-pressure, laser-heated samples for TEM study. Observations of TEM sections show the presence of five phases for samples transformed at pressures ranging from 33 to 45 GPa: Al-bearing Mg-perovskite, Ca-silicate perovskite, stishovite, and two Al-rich phases. The Al-rich phases were identified by selected area electron diffraction (SAED) patterns and chemical composition analysis, and include the new aluminous (NAL) phase with hexagonal structure and the calcium ferrite (CF) type phase. Chemical analyses obtained by analytical transmission electron microscopy (ATEM) show that Mg-silicate perovskite is the major host for Al, with significant amounts also distributed between the CF-type and NAL phases, and less than 1 wt% in stishovite. Beyond pressures of ~40 GPa (~1100 km depth), the Al content of Mg-perovskite and CF-type phase increases. Between 45 and 50 GPa, the NAL phase disappears. This mineralogical change may explain reported seismic anomalies in subduction zones at mid-mantle depths

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2008
• Auteurs : Arnaud Le PadellecPatrick Moretto-CapelleMartine Richard-ViardJean-Philippe ChampeauxPierre Cafarelli
• Organismes : Interactions Ions-Matière (LCAR) Interactions Ions-Matière (LCAR) Interactions Ions-Matière (LCAR) Interactions Ions-Matière (LCAR) Interactions Ions-Matière (LCAR)
• Publié dans Journal of Physics: Conference Series le 24/10/2020

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Résumé : We present recent results obtained in the Toulouse's group that deal with proton to base and nucleoside interactions. We stress the weakness of the sugar part in the nucleoside, i.e. the uridine molecule under scrutiny. Since some parts of the fragmentation spectrum correspond to the fragmentation of a 'pure' uracil molecule, i.e. the RNA base, an 'additivity rule' seems to prevail for the nucleoside, something that still has to be confirmed. Moreover, some results that deal with the secondary electronic emission from uracil are also displayed.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2008
• Auteurs : Claire-Emilie VaudeyN. ToulhoatNathalie MoncoffreNicolas BererdLouis RaimbaultPhilippe SainsotJean-Noël Rouzaud
• Organismes : Institut de Physique Nucléaire de Lyon Institut de Physique Nucléaire de Lyon CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) Institut de Physique Nucléaire de Lyon Institut de Physique Nucléaire de Lyon Centre de Géosciences Laboratoire Pierre Süe Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] Laboratoire de géologie de l'ENS
• Publié dans Journal of Nuclear Materials le 25/10/2020

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Résumé : In this paper, we present the study of thermal behaviour of 36Cl in nuclear graphite used in the St. Laurent A2 UNGG reactor (graphite moderated and CO2 cooled reactor). 37Cl, used to simulate 36Cl displaced from its original structural site by recoil, has been implanted into nuclear graphite samples (energy = 250 keV, fluence = 5 × 1013 at cm-2). The samples have been annealed in the 200-800 °C temperature range and analysed by SIMS. Structural modifications have been controlled by Raman microspectroscopy. This study shows that, in the considered temperature range and for a short annealing duration (4 h), chlorine is released almost athermally. At 500 °C, around 20% of the initial 37Cl content is released. At 800 °C, the release reaches a plateau and the loss of 37Cl is around 30%. Raman microspectroscopy shows that 37Cl implantation induces a structural disorder and that during annealing, the original structure is not completely recovered. © 2009 Elsevier B.V. All rights reserved.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2008
• Auteurs : Mathieu MévelFrançois LamarcheJean-Claude ClémentPascal LaurentJean-Jacques YaouancLaure Burel-DeschampsPhilippe GiamarchiTristan MontierPascal DelépinePierre LehnPaul-Alain JaffrèsClaude Ferec
• Organismes : Chimie, Electrochimie Moléculaires et Chimie Analytique Chimie, Electrochimie Moléculaires et Chimie Analytique Chimie, Electrochimie Moléculaires et Chimie Analytique Chimie, Electrochimie Moléculaires et Chimie Analytique Chimie, Electrochimie Moléculaires et Chimie Analytique Chimie, Electrochimie Moléculaires et Chimie Analytique Chimie, Electrochimie Moléculaires et Chimie Analytique Génétique moléculaire et génétique épidémiologique Génétique moléculaire et génétique épidémiologique Génétique moléculaire et génétique épidémiologique Chimie, Electrochimie Moléculaires et Chimie Analytique Génétique moléculaire et génétique épidémiologique
• Publié dans Phosphorus, Sulfur, and Silicon and the Related Elements le 02/11/2020

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Fichiers liés : Mevel2008.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2008
• Auteurs : Jean‐sébastien LauretValérie AlainGurvan MagadurM. DelerueChristophe VoisinPhilippe RoussignolEmmanuelle DeleporteJacques A. Delaire
• Organismes : Laboratoire de Photonique Quantique et Moléculaire Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires Laboratoire de Photonique Quantique et Moléculaire Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires Laboratoire de Photonique Quantique et Moléculaire Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire de Photonique Quantique et Moléculaire Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires

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Résumé : Tailoring properties of carbon nanotubes properties by functionalizing their side-wall is one of the key challenges towards the realization of carbon nanotube-based optoelectronic devices [1, 2]. This technique aims at combining the great transport properties of the nanotube [3, 4] with the versatility of the optical properties of organic molecules. The extraordinary properties of carbon nanotubes reside in their one dimensional feature. Therefore, using these properties inside devices require preserving this unique feature. Photoluminescence experiment is one of the most sensitive tools to the changes in the electronic structure of semi-conductors. Preserving photoluminescence of semi-conducting nanotubes means preserving their one dimensional feature and therefore their remarkable properties. We present our results about "p-stacking" functionalization of single wall carbon nanotubes with different porphyrins molecules [5]. These complexes show a total quenching of the porphyrin fluorescence, while the photoluminescence of the nanotubes is preserved and even enhanced when the excitation is tuned in resonance with the Soret band of the porphyrins. This is the evidence for an efficient excitation transfer within the nanotube/porphyrin complex, which corresponds to the implementation of a key functionnality: an organic graft acting as an antenna and the nanotube acting as a collector [5, 6]. [1] M.S. Strano, C.A. Dyke, M.L. Usrey, P.W. Barone, M.J. Allen, H. Shan, C. Kittrell, R.H. Hauge, J.M. Tour, R.E. Smalley, Science 2003, 301, 1519-1522. [2] D.M. Guldi, J. Phys. Chem. B 2005, 109, 11432-11441. [3] P. Avouris, Z. Chen, V. Pereibeinos, Nature nanotechnology 2007, 2, 605-615. [4] A.D. Mohite, P. Gopinath, H.M. Shah, B.W. Alphenaar, Nano Lett. 2008, 8, 142-146. [5] G. Magadur, J.S. Lauret, V. Alain-Rizzo, C. Voisin, Ph. Roussignol, E. Deleporte, J. A. Delaire ChemPhysChem 2008 (in press) [6] J.P. Casey, S.M. Bachilo, R.B. Weisman, J. Mat. Chem. 2008, DOI: 10.1039/b716649d

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