Philippe JEAN-PIERRE

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Vincent GuenardPhilippe DrobinskiJean-Luc CacciaBernard CampistronBruno Bench
• Organismes : Laboratoire de sondages électromagnétiques de l'environnement terrestre Service d'aéronomie Laboratoire de sondages électromagnétiques de l'environnement terrestre Laboratoire d'aérologie Laboratoire d'aérologie
• Publié dans Boundary-Layer Meteorology le 29/10/2020

---

Résumé : We investigate the mesoscale dynamics of the mistral through the wind profiler observations of the MAP (autumn 1999) and ESCOMPTE (summer 2001) field campaigns. We show that the mistral wind field can dramatically change on a time scale less than 3 hours. Transitions from a deep to a shallow mistral are often observed at any season when the lower layers are stable. The variability, mainly attributed in summer to the mistral/land–sea breeze interactions on a 10-km scale, is highlighted by observations from the wind profiler network set up during ESCOMPTE. The interpretations of the dynamical mistral structure are performed through comparisons with existing basic theories. The linear theory of R. B. Smith [Advances in Geophysics, Vol. 31, 1989, Academic Press, 1–41] and the shallow water theory [Schär, C. and Smith, R. B.: 1993a, J. Atmos. Sci. 50, 1373–1400] give some complementary explanations for the deep-to-shallow transition especially for the MAP mistral event. The wave breaking process induces a low-level jet (LLJ) downstream of the Alps that degenerates into a mountain wake, which in turn provokes the cessation of the mistral downstream of the Alps. Both theories indicate that the flow splits around the Alps and results in a persistent LLJ at the exit of the Rhône valley. The LLJ is strengthened by the channelling effect of the Rhône valley that is more efficient for north-easterly than northerly upstream winds despite the north–south valley axis. Summer moderate and weak mistral episodes are influenced by land–sea breezes and convection over land that induce a very complex interaction that cannot be accurately described by the previous theories.

---

Fichiers liés : Guenard2005.pdf

---

Source

---

• 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

---

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.

---

Source

---

• 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

---

Source

---

• 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

---

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.

---

Fichiers liés : voisin_prb.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Christophe LambertPhilippe SoudantLionel DégremontMaryse DelaporteJeanne MoalPierre BoudryFred JeanArnaud HuvetJean-François Samain
• Organismes : Laboratoire des Sciences de l'Environnement Marin (LEMAR) Université européenne de Bretagne - European University of Brittany Laboratoire des Sciences de l'Environnement Marin (LEMAR) Université européenne de Bretagne - European University of Brittany Unité Amélioration génétique, Santé animale et Environnement Physiologie et Ecophysiologie des Mollusques Marins Physiologie et Ecophysiologie des Mollusques Marins Unité Amélioration génétique, Santé animale et Environnement Laboratoire des Sciences de l'Environnement Marin (LEMAR) Université européenne de Bretagne - European University of Brittany Physiologie et Ecophysiologie des Mollusques Marins Physiologie et Ecophysiologie des Mollusques Marins
• Publié dans Aquaculture le 01/11/2020

---

Résumé : High variability among individuals is often encountered when hemocyte characteristics are measured in bivalves. Such variability is suspected to result partly from genetic factors. In this study, hemocyte characteristics of six families of Crassostrea gigas were compared by flow cytometry at one sampling date in October 2001. These families were obtained from a nested, halfsibling cross design, and reared from July to October 2001 at three sites distributed along the French Atlantic coast from north to south: Baie des Veys (Normandy), Rivière d'Auray (Brittany) and Ronce (Marennes-oléron Basin, Poitou Charentes). Among the 15 measured hemocyte characteristics, production of reactive oxygen species (ROS) of untreated hemocytes (maintained in filtered sterile seawater) and treated hemocytes (zymosan at 20 particles per hemocyte, and with Vibrio sp. S322 at 50 bacteria per hemocyte) was the most notable differences between families. This supports the existence of a genetic basis, at least partly, for the hemocyte characteristics of oysters, and especially for ROS production. Among the six families analyzed, three have shown high survival during summer (named as "resistant", mean mortality 5.2%) and three experienced high mortality during summer (named as "susceptible", 30.6% mean mortality). Families showing high or low survival to summer mortality had similar hemocyte characteristics, regardless of the environmental conditions or reproductive state. Resistant families were observed to have higher total hemocyte counts and lower production of ROS than susceptible families. Moreover, ROS production of hemocytes from susceptible families was diminished significantly more by pathogenic Vibrio than that of resistant families. However, this study demonstrates also that rearing site strongly affected the hemocyte characteristics of all families of oysters, most notably hemocyte concentration and morphology (size and granularity), production of reactive oxygen species (ROS), and susceptibility to the cytotoxic activity of the pathogenic Vibrio sp. S322 (50 bacteria/ hemocyte). Food availability and reproductive state are the most probable explanations for the site differences observed. Finally, it appeared difficult to link oyster survival during summer mortality to hemocyte profiles evaluated at one sampling date; other relevant indicators would probably help explaining oyster survival during summer mortality events.

---

Fichiers liés : Lambert_et_al_2007_Aquaculture_270_276-288_-auteurs.pdf

---

Source

---

• 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

---

Fichiers liés : a040p229.pdf

---

Source

---

• 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

---

Source

---

• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2005
• Auteurs : Jean-Philippe DelahayeChristophe MoyPierre LerayJacques Palicot
• Organismes : Institut d'Électronique et des Technologies du numéRique Institut d'Electronique et de Télécommunications de Rennes Institut d'Electronique et de Télécommunications de Rennes Institut d'Electronique et de Télécommunications de Rennes

---

Résumé : This paper deals with partial reconfiguration issues on heterogeneous prototyping platforms (DSP/ FPGA). An analysis of multi-standard physical layer applications in terms of reconfiguration needs permits to extract several use cases of reconfiguration in a multi-standard handset: standard switching, mode switching, bug fixing, etc. The main difference between these schemes of reconfiguration is the level of granularity of the reconfiguration. We argue that a configuration manager needs to handle this multi-granularity of reconfiguration to optimize the change of context (either reconfigurable hardware or programmable software processing components) in terms of size of code, time to reconfigure, etc. The analysis also helps to determine the accurate level of flexibility needed through the reconfigurable architecture at different scales. Within this framework partial reconfiguration is an essential feature for optimizing the reconfiguration inside FPGA. We aim indeed at providing reconfiguration adequacy between re-configurability capabilities of hardware resources and reconfiguration needs of Software Defined Radio applications. Architectural solutions are proposed to implement partial reconfiguration on existing hardware combining DSP and FPGA.

---

Fichiers liés : 02.2-01.PDF

---

Source

---

• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2005
• Auteurs : Stéphane HaïkDamien GalanaudBaptiste FaucheuxN. PrivatI. Laffont-ProustMarius George LinguraruNicholas AyacheJ.J. HauwDidier DormontJean-Philippe Brandel
• Organismes : Laboratoire de Neuropathologie Raymond Escourolle [CHU Pitié-Salpétriêre] Centre de résonance magnétique biologique et médicale CHU Pitié-Salpêtrière [AP-HP] Medical imaging and robotics Medical imaging and robotics Analysis and Simulation of Biomedical Images CHU Pitié-Salpêtrière [AP-HP] Neurosciences cognitives et imagerie cérébrale Laboratoire d'Imagerie Fonctionnelle Centre de Recherche de l'Institut du Cerveau et de la Moelle épinière Neuroépidémiologie

---

Résumé : Recently, several reports underlined the usefulness of brain MRI for the diagnosis of Creutzfeldt-Jakob dis ease. FLAIR sequence and diffusion-weighted imaging (DWI) are considered as high sensitive sequences to detect signal alteration of the cortex and the deep grey matter. Recent advances in therapeutic approach of patients with prion diseases have emphasized the need for earlier diagnostic markers that would authorize the onset of treatment before massive and irreversible lesions of the brain have occurred. Consequently, we designed a radio -clinical study using a multimodality MRI standardized procedure that aimed to estimate differential sensitivity of FLAIR, DWI and MR spectroscopy for the diagnosis of human TSE. Here we report a case of familial fatal insomnia with the D178N-129M mutation. FLAIR and diffusion-weighted sequences were normal in the whole brain notably in both thalami. However, spectroscopic study showed a striking increase of the peak of myo-inositol (mI) and of the mI/NAA ratio in the thalamus when compared to the other studied brain regions of the patient (frontal isocortex, lenticular nucleus and cerebellar vermis) and to the thalami of control cases (n = 10). This metabolite pattern is indicating of gliosis. Because the MRI study was performed only two days before death, we were able to strictly correlate the spectroscopic data with the neuropathological lesions (including the severity of astrogliosis and microglial activation) observed in the thalamus. From this observation, we can conclude that 1) MR spectroscopy can detect prion-related lesions even when other sequences appear normal 2) spectroscopic metabolite pattern well correlates with the neuropathological one.

---

Source

---

• 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

---

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

---

Source