Philippe Jean-Pierre

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Frédéric MoretLionel ChristiaenCarole DeytsMarylin BlinJean-Stéphane JolyPhilippe Vernier
• Organismes : Développement, évolution et plasticité du système nerveux Développement, évolution et plasticité du système nerveux Développement, évolution et plasticité du système nerveux Institut de Chimie des Substances Naturelles Neurobiologie des processus adaptatifs Développement, évolution et plasticité du système nerveux Développement, évolution et plasticité du système nerveux Institut de Chimie des Substances Naturelles Développement, évolution et plasticité du système nerveux Institut de Neurobiologie Alfred Fessard
• Publié dans European Journal of Neuroscience le 22/10/2020

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Résumé : Dopamine is a major neuromodulator synthesized by numerous cell populations in the vertebrate forebrain and midbrain. Owing to the simple organization of its larval nervous system, ascidian tunicates provide a useful model to investigate the anatomy, neurogenesis and differentiation of the dopaminergic neural network underlying the stereotypical swimming behaviour of its chordate-type larva. This study provides a high-resolution cellular analysis of tyrosine hydroxylase (TH)-positive and dopamine-positive cells in Ciona intestinalis embryos and larvae. Dopamine cells are present only in the sensory vesicle of the Ciona larval brain, which may be an ancestral chordate feature. The dopamine-positive cells of the ascidian sensory vesicle are located in the expression domain of homologues of vertebrate hypothalamic markers. We show here that the larval coronet cells also arise from this domain. As a similar association between coronet cells and the hypothalamus was reported in bony and cartilaginous fishes, we propose that part of the ascidian ventral sensory vesicle is the remnant of a proto-hypothalamus that may have been present in the chordate ancestor. As dopaminergic cells are specified in the hypothalamus in all vertebrates, we suggest that the mechanisms of dopamine cell specification are conserved in the hypothalamus of Ciona and vertebrates. To test this hypothesis, we have identified new candidate regulators of dopaminergic specification in Ciona based on their expression patterns, which can now be compared with those in vertebrates.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Jean-Paul LaclauJacques J. RangerPhilippe DeleporteYann NouvellonLaurent Saint‐andréSerge MarletJean-Pierre Bouillet
• Organismes : Escola Superior de Agricultura Luiz de Queiroz Unité de recherche Biogéochimie des Ecosystèmes Forestiers Unité de recherche Biogéochimie des Ecosystèmes Forestiers Centre de Coopération Internationale en Recherche Agronomique pour le Développement Centre de Coopération Internationale en Recherche Agronomique pour le Développement
• Publié dans Forest Ecology and Management le 26/10/2020

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Résumé : Clonal plantations of Eucalyptus have been introduced since 1978 on savanna soils of the coastal plains of Congo. Atmospheric deposition, canopy exchange and transfer through the soil were estimated on the whole rooting depth (6 m) over 3 years, in an experimental design installed in a native savanna and an adjacent 6-year-old Eucalyptus plantation. Complementary measurements after planting the experimental savanna made it possible to establish input–output budgets of nutrients for the whole Eucalyptus rotation and to compare them with the native savanna ecosystem. In this highly-weathered soil, atmospheric deposits and symbiotic N fixation by a legume species balanced the nutrient budgets in savanna, despite large losses during annual burnings. After afforestation, weeding in the Eucalyptus stands eliminated the leguminous species responsible for a N input by symbiotic fixation of about 20 kg ha-1 year-1. Whereas the budgets of P, K, Ca and Mg were roughly balanced, the current silviculture led to a deficit of about 140 kg N ha-1 in the soil, throughout a 7-year rotation. This deficit was large relative to the pool of total N in the upper soil layer (0–50 cm), which was about 2 t ha-1. Therefore, the sustainability of Congolese plantations will require an increase in N fertilizer inputs over successive rotations to balance the N budget. These results were consistent with field trials of fertilization. Practical consequences of these budgets were identified, in order to: (i) direct field trials of fertilization, (ii) select appropriate methods of soil preparation, weed control and harvest, (iii) highlight the importance of fire prevention in this area, and (iv) support the implementation of field trials aiming at introducing a biological nitrogen fixing understorey in Eucalyptus stands.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Ivan FaveroGuillaume CassaboisDavid DarsonChristophe VoisinClaude DelalandePhilippe RoussignolJ.-M. Gérard
• Organismes : Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Nanophysique et Semiconducteurs
• Publié dans Physica E: Low-dimensional Systems and Nanostructures le 02/11/2020

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• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2005
• Auteurs : Jean-Philippe RetailléRenaud PawlakLionel Seinturier
• Organismes : Weaving of Software Components Large-Scale Distributed Systems and Applications Laboratoire d'Informatique Fondamentale de Lille

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2005
• Auteurs : R. LaplanaNicolas A TurpinM. KaljonenP. StraussI. BarlundG. BenigniThierry BioteauFrançois BirgandPhilippe BontemsPierre BordenaveO.M. EkloF. FeichtingerM. GarnierR. HaverkampA. LeoneS. TattariJean-Marie LescotAntonio Lo PortoLaurent PietM.N. RipaE. RomstadG. RotillonFrédéric Zahm
• Organismes : Aménités et dynamiques des espaces ruraux Gestion environnementale et traitement biologique des déchets SYKE HELSINKI FIN IKT PETZENKIRCHEN AUT SYKE HELSINKI FIN ISTITUTO DI GENIO RURALE VITERBO ITA Gestion environnementale et traitement biologique des déchets Gestion environnementale et traitement biologique des déchets Institut National de la Recherche Agronomique Gestion environnementale et traitement biologique des déchets Norwegian Crop Research Institute IKT PETZENKIRCHEN AUT IRSA BARI ITA Université Grenoble Alpes [2016-2019] ISTITUTO DI GENIO RURALE VITERBO ITA SYKE HELSINKI FIN Aménités et dynamiques des espaces ruraux IRSA BARI ITA Aménités et dynamiques des espaces ruraux ISTITUTO DI GENIO RURALE VITERBO ITA AUN NOR Université Paris Nanterre Aménités et dynamiques des espaces ruraux

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Résumé : To design the restoration plans requested by the European Water Framework Directive, local regulators need to implement technically designed modifications of farming practices. Their main interest relies on the determination of which modifications are the most appropriate to the local conditions. To help this decision process, a selection grid has been built within the European AgriBMPWater project (5th RTD Framework Program). The main interest of this grid is to allow the comparison of different "Best Management Practices" regarding their environmental effectiveness, the associated costs and their acceptability for farmers. This paper presents the different steps of the method, some tools that have been used and their technical requirements, illustrates with some results the integrated tool that has been developed and provides keys for interpretation.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Christophe CoudretG. GuiradoC. HortolaryJean-Pierre LaunayN. BattagliniH.R. KleinPhilippe Dumas
• Organismes : Centre Interdisciplinaire de Nanoscience de Marseille Centre Interdisciplinaire de Nanoscience de Marseille
• Publié dans Molecular Crystals and Liquid Crystals le 21/10/2020

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2005
• Auteurs : Sébastien BergerJean‐sébastien LauretGuillaume CassaboisChristophe VoisinPhilippe RoussignolClaude DelalandeLaurence Goux-CapesArianna Filoramo
• Organismes : Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Service de physique de l'état condensé Service de physique de l'état condensé

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Jean‐sébastien LauretChristophe VoisinSébastien BergerGuillaume CassaboisClaude DelalandePhilippe RoussignolLaurence Goux-CapesArianna Filoramo
• Organismes : Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire d'Electronique Moléculaire Laboratoire d'Electronique Moléculaire
• Publié dans Physical Review B: Condensed Matter and Materials Physics (1998-2015) le 02/11/2020

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Résumé : Carrier dynamics is investigated in both luminescent and non luminescent samples of single wall carbon nanotubes -obtained by laser ablation- by means of two-color pump-probe experiments. The recombination dynamics is monitored by probing the transient photobleaching observed on the interband transitions of semi-conducting nanotubes. Interband and inter-subband relaxation times are about one order of magnitude slower in isolated nanotubes than in ropes of nanotubes bringing evidence of the environment influence on the carrier dynamics. The relaxation dynamics is non-exponential and is interpreted as a consequence of the inhomogeneity of the sample. Slow components up to 250 ps are measured which is significantly greater than values previoulsy reported in HiPCo nanotubes. These observations show the great dependence of the electronic properties of carbon nanotubes on the synthesis method and on their environment.

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Fichiers liés : voisin_prb.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Pablo SamaniegoHervé MartinMichel MonzierClaude RobinMichel FornariJean-Philippe EissenJoseph Cotten
• Organismes : Laboratoire Magmas et Volcans Laboratoire Magmas et Volcans Géoazur Domaines Océaniques
• Publié dans Journal of Petrology le 25/10/2020

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Résumé : In the Northern Volcanic Zone of the Andes, the Cayambe Volcanic Complex consists of: (1) a basal, mostly effusive volcano, the Viejo Cayambe, whose lavas (andesites and subordinate dacites and rhyolites) are typically calc-alkaline; and (2) a younger, essentially dacitic, composite edifice, the Nevado Cayambe, characterized by lavas with adakitic signatures and explosive eruptive styles. The construction of Viejo Cayambe began >1·1 Myr ago and ended at 1·0 Ma. The young and still active Nevado Cayambe grew after a period of quiescence of about 0·6 Myr, from 0·4 Ma to Holocene. Its complex history is divided into at least three large construction phases (Angureal cone, Main Summit cone and Secondary Summit cone) and comprises large pyroclastic events, debris avalanches, as well as periods of dome activity. Geochemical data indicate that fractional crystallization and crustal assimilation processes have a limited role in the genesis of each suite. On the contrary, field observations, and mineralogical and geochemical data show the increasing importance of magma mixing during the evolution of the volcanic complex. The adakitic signature of Nevado Cayambe magmas is related to partial melting of a basaltic source, which could be the lower crust or the subducted slab. However, reliable geophysical and geochemical evidence indicates that the source of adakitic component is the subducted slab. Thus, the Viejo Cayambe magmas are inferred to come from a mantle wedge source metasomatized by slab-derived melts (adakites), whereas the Nevado Cayambe magmas indicate a greater involvement of adakitic melts in their petrogenesis. This temporal evolution can be related to the presence of the subducted Carnegie Ridge, modifying the geothermal gradient along the Wadati–Benioff zone and favouring slab partial melting

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Jean-François GhiglioneMarièle LarcherPhilippe Lebaron
• Organismes : Laboratoire d'océanographie biologique de Banyuls Laboratoire d'océanographie biologique de Banyuls Laboratoire d'océanographie biologique de Banyuls
• Publié dans Aquatic Microbial Ecology le 02/11/2020

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Fichiers liés : a040p229.pdf

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