Philippe JEAN-PIERRE

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• Type de publi. : Communication dans un congrès
• Date de publi. : 02/02/1999
• Auteurs : Philippe GuillouetThierry TriboutJ.F. BussièreGerard BertaudJean Pierre BidanelMichel Terqui
• Organismes : Insémination Caprine et Porcine Station de Génétique Quantitative et Appliquée Insémination Caprine et Porcine Insémination Caprine et Porcine Station de Génétique Quantitative et Appliquée Physiologie de la reproduction et des comportements [Nouzilly]

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Fichiers liés : JRP-Guillouet-et-al-1999.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/1999
• Auteurs : Serge LallemandChar-Shine LiuStéphane DominguezPhilippe SchnürleJacques MalavieilleJacques AngelierJean-Yves CollotB. DeffontainesMarc FournierS.-K. HsuJean-Pierre Le FormalS.-Y. LiuC.-Y. LuJean-Claude SibuetNicolas ThareauF. Wang
• Organismes : Laboratoire de Géophysique, Tectonique et Sédimentologie National Taiwan University Laboratoire de Géophysique, Tectonique et Sédimentologie National Taiwan University Université Montpellier 2 - Sciences et Techniques Laboratoire de Géophysique, Tectonique et Sédimentologie Université Pierre et Marie Curie - Paris 6 ORSTOM Université Pierre et Marie Curie - Paris 6 Université Pierre et Marie Curie - Paris 6 National Taiwan University Institut Français de Recherche pour l'Exploitation de la Mer National Taiwan University National Taiwan University Institut Français de Recherche pour l'Exploitation de la Mer Institut Français de Recherche pour l'Exploitation de la Mer
• Publié dans Tectonics le 22/10/2020

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Résumé : Detailed seafloor mapping in the area east of Taiwan revealed trench-parallel stretching and folding of the Ryukyu forearc and lateral motion of the accretionary wedge under oblique convergence. East of 122ø40'E, a steep accretionary wedge is elongated in an E-W direction. A major transcurrent right-lateral strike-slip fault accommodates the strain partitioning caused by an oblique convergence of 40 ø. A spectacular out-of-sequence thrust may be related to the subduction of a structural high lying in the axis of the N-S trending Gagua Ridge. This asperity is likely responsible for the uplift of the accretionary wedge and forearc basement and may have augmented strain partitioning by increasing the coupling between the two plates. West of 122ø40'E, the low-taper accretionary wedge is sheared in a direction subparallel to the convergence vector with respect to the Ryukyu Arc. The bayonet shape of the southern Ryukyu Arc slope partly results from the recent (re)opening of the southern Okinawa Trough at a rate of about 2 to 4 cm/yr. Right-lateral shearing of the sedimentary forearc with respect to the nonlinear Ryukyu backstop generates trench-parallel extension in the forearc sediment sequence at dilational jogs and trench-parallel folding at compressive jogs. The Hoping Basin lies above a diffuse trench/trench/fault (TTF) or TFF unstable triple junction moving toward the south along a N-S transform zone which accommodates the southward drift of the Ryukyu Arc with respect to Eurasia.

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Fichiers liés : Lallemand_et_al-1999-Tectonics.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1999
• Auteurs : A.-M. HarriO. MarsalPhilippe LognonnéG.W. LeppelmeierT. SpohnK.-H. GlassmeierF. AngrilliW.B. BanerdtJ.P. BarriotJean-Loup BertauxJean-Jacques BerthelierS. CalcuttJean-Claude CerisierD. CrispV. DehantD. GiardiniR. JaumannY. LangevinMichel MenvielleG. MusmannJean-Pierre PommereauS. Di PippoD. GuerrierK. KumpulainenS. LarsenA. MocquetJ. PolkkoJ. RunavotW. SchumacherT. SiiliJ. SimolaJ.E. Tillman
• Organismes : Finnish Meteorological Institute Centre National d'Études Spatiales [Toulouse] Institut de Physique du Globe de Paris Finnish Meteorological Institute Institut für Planetologie [Münster] Institut für Geophysik und Extraterrestrische Physik [Braunschweig] Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo” Jet Propulsion Laboratory Observatoire Midi-Pyrénées Service d'aéronomie Centre d'étude des environnements terrestre et planétaires University of Oxford Centre d'étude des environnements terrestre et planétaires Jet Propulsion Laboratory Royal Observatory of Belgium = Observatoire Royal de Belgique Institut für Geophysik [Zürich] DLR Institut für Planetenforschung Institut d'astrophysique spatiale Centre d'étude des environnements terrestre et planétaires Institut für Geophysik und Meteorologie [Braunschweig] Service d'aéronomie Italian Space Agency Aerospatiale Inc. Space Systems Finland Ltd Risø National Laboratory Laboratoire de Planétologie et Géodynamique de Nantes [UMR 6112] Finnish Meteorological Institute Centre National d'Études Spatiales [Toulouse] Finnish Meteorological Institute Department of Atmospheric Sciences [Seattle]
• Publié dans Advances in Space Research le 26/10/2020

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Résumé : The NetLander Mission will deploy four landers to the Martian surface. Each lander includes a network science payload with instrumentation for studying the interior of Mars, the atmosphere and the subsurface, as well as the ionospheric structure and geodesy. The NetLander Mission is the first planetary mission focusing on investigations of the interior of the planet and the large-scale circulation of the atmosphere. A broad consortium of national space agencies and research laboratories will implement the mission. It is managed by CNES (the French Space Agency), with other major players being FMI (the Finnish Meteorological Institute), DLR (the German Space Agency), and other research institutes. According to current plans, the NetLander Mission will be launched in 2005 by means of an Ariane V launch, together with the Mars Sample Return mission. The landers will be separated from the spacecraft and targeted to their locations on the Martian surface several days prior to the spacecraft's arrival at Mars. The landing system employs parachutes and airbags. During the baseline mission of one Martian year, the network payloads will conduct simultaneous seismological, atmospheric, magnetic, ionospheric, geodetic measurements and ground penetrating radar mapping supported by panoramic images. The payloads also include entry phase measurements of the atmospheric vertical structure. The scientific data could be combined with simultaneous observations of the atmosphere and surface of Mars by the Mars Express Orbiter that is expected to be functional during the NetLander Mission's operational phase. Communication between the landers and the Earth would take place via a data relay onboard the Mars Express Orbiter.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1999
• Auteurs : Jean‐françois CantaloubePierre GallianPhilippe BiaginiHoussam AttouiJacqueline EscherJean‐pierre ZappitelliYves DelordPhilippe de MiccoXavier de Lamballerie
• Organismes : Virologie UMR1161
• Publié dans Transfusion le 25/10/2020

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Résumé :

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1999
• Auteurs : Catherine BirckLionel MoureyPatrice GouetBéatrice FabryJörg SchumacherPhilippe RousseauDaniel KahnJean-Pierre Samama
• Organismes : Institut de pharmacologie et de biologie structurale
• Publié dans Structure le 31/10/2020

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Résumé : Background: A variety of bacterial adaptative cellular responses to environmental stimuli are mediated by two-component signal transduction pathways. In these phosphorelay cascades, histidine kinases transphosphorylate a conserved aspartate in the receiver domain, a conserved module in the response regulator superfamily. The main effect of this phosphorylation is to alter the conformation of the response regulator in order to modulate its biological function. The response regulator FixJ displays a typical modular arrangement, with a phosphorylatable N-terminal receiver domain and a C-terminal DNA-binding domain. In the symbiotic bacterium Sinorhizobium meliloti, phosphorylation of this response regulator activates transcription of nitrogen-fixation genes. Results: The crystal structures of the phosphorylated and of the unphosphorylated N-terminal receiver domain of FixJ (FixJN) were solved at 2.3 Å and 2.4 Å resolution, respectively. They reveal the environment of the phosphoaspartate in the active site and the specific conformational changes leading to activation of the response regulator. Phosphorylation of the conserved aspartate induces major structural changes in the β4-α4 loop, and in the signaling surface α4-β5 that mediates dimerization of the phosphorylated full-length response regulator. A site-directed mutant at this protein-protein interface decreases the affinity of the phosphorylated response regulator for the fixK promoter tenfold. Conclusions: The cascade of phosphorylation-induced conformational changes in FixJN illustrates the role of conserved residues in stabilizing the phosphoryl group in the active site, triggering the structural transition and achieving the post-phosphorylation signaling events. We propose that these phosphorylation-induced conformational changes underly the activation of response regulators in general.

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Fichiers liés : birck-structure99.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1999
• Auteurs : Jean-Philippe NougayrèdeOlivier MarchesMichèle BouryJacques MainilGerard CharlierPierre PohlJean de RyckeAlain MilonEric Oswald
• Organismes : Institut de Recherche en Santé Digestive
• Publié dans Molecular Microbiology le 28/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1999
• Auteurs : Jean-Philippe BoulangerChristophe Menkes
• Organismes : Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
• Publié dans Climate Dynamics le 30/10/2020

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Résumé : The TOPEX/POSEIDON sea level data have been shown to observe the sea surface height variability accurately over the globe and, more particularly, in the tropical Pacific, core region of the El Niño/Southern Oscillation. Various studies have already provided descriptions of long equatorial wave propagation as well as estimates of their reflection at both the eastern and western boundaries using TOPEX/POSEIDON data over short time periods. In this present work, we are first interested in computing long equatorial wave amplitudes over a much longer period (October 1992-May 1998) focusing on the Kelvin and first three largest Rossby waves. Secondly, we are examining qualitatively potential theories of ENSO in the light of observations of the strong 1997-1998 El Niño event. At the eastern boundary, Kelvin waves are observed to reflect into first (third) mode Rossby waves with a reflection efficiency of 75% (65%) of that of an infinite meridional wall. In the western Pacific Ocean, the reflection of the first Rossby wave does explain more than 90% of the Kelvin wave variance. The second Rossby wave is found not to be correlated to the Kelvin wave amplitude, and the third Rossby wave is highly correlated to the Kelvin signal although its contribution is weak. The investigation during the 1997-1998 event of two theories potentially important for ENSO (the delayed action oscillator mechanism and the recent theory of Picaut et al., 1997) led us to the following conclusions. The westerly wind anomalies observed in the western Pacific in December 1996 and March 1997 forced downwelling Kelvin waves which advected the eastern edge of the warm pool eastward and deepened the thermocline in the east Pacific. Both zonal advection and vertical processes are suggested to act constructively during the onset of positive anomalies in the central and eastern Pacific. From May to September 1997, downwelling Kelvin wave wind-forced in the central Pacific and reflected downwelling Rossby waves (reinforced by local easterly wind anomalies) acted against each other, and the 28°C isotherm was found to move slightly westward. In October 1997, strong westerly wind anomalies forced a strong downwelling Kelvin wave potentially responsible for the strong warming in the east Pacific. The 28°C isotherm reached the eastern boundary. At that time, the equatorial sea surface temperatures are zonally homogeneous. The strong downwelling Rossby waves reflected at the boundary could not act to terminate the warm event through zonal advection as suggested by Picaut et al. However the reflected upwelling Kelvin waves coming from the western boundary weakened the downwelling Kelvin signal in the central and east Pacific leading to a decrease of the sea surface temperature anomalies. Following this decrease, westerly wind anomalies in the central Pacific weakened, and upwelling Kelvin waves reinforced by easterly wind anomalies in the western Pacific propagated toward the eastern Pacific. As a conclusion, both theories must be considered simultaneously to understand the variability observed during the 1997-1998 El Niño event. However observations strongly suggest the delayed action oscillator mechanism to be the major process at work during the weakening of the warm 1997-1998 ENSO.

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/1999
• Auteurs : Philippe Sénac
• Organismes : France, Amériques, Espagne, Sociétés, Pouvoirs, Acteurs

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• Type de publi. : Rapport
• Date de publi. : 01/01/1999
• Auteurs : Pierre AndriesPatrick Le TallecJean-Philippe PerlatBenoît Perthame
• Organismes : Multi-Models and Numerical Methods Multi-Models and Numerical Methods Multi-Models and Numerical Methods

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Résumé : In this paper we prove the entropy inequality for the Gaussian-BGK model of Boltzmann equation. This model, also called ellipsoidal statistical model, was introduced in order to fit realistic values of the transport coefficients (Prandtl number, second viscosity) in the Navier-Stokes approxima- tion, which cannot be achieved by the usual relaxation towards isotropic Maxwellians introduced in standard BGK models. Moreover, we introduce new entropic kinetic models for polyatomic gases which suppress the internal energy variable in the phase space by using two distribution functions (one for particles mass and one for their internal energy). This reduces the cost of their numerical solution while keeping a kinetic description well adapted to desequilibrium regions.

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Fichiers liés : RR-3716.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1999
• Auteurs : Philippe BiaginiPierre GallianHoussam AttouiJean-François CantaloubePhilippe de MiccoXavier de Lamballerie
• Organismes : Virologie UMR1161
• Publié dans Journal of General Virology le 01/11/2020

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