Philippe JEAN-PIERRE

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Jasmina LahlahPierre RenaultPatrick CazevieilleAurelie BuzetJean-Louis F HazemannManfred WomesPhilippe Cambier
• Organismes : Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes Recyclage et risque Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes Matériaux, Rayonnements, Structure Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier Environnement et Grandes Cultures
• Publié dans Soil Science Society of America Journal le 22/10/2020

---

Résumé : The spreading of vinasse on soils may favor not only anoxia but also mineral alterations and metal mobilization. Our aims were to record the geochemical changes occurring in a ferralsol subjected to vinasse input and anaerobiosis, and to check for soil resilience after a return to aerobic conditions. Soil slurries were therefore incubated under successive 7 d of aerobic, 0 to 28 d of anaerobic, and 28 d of aerobic conditions, vinasse being supplied at one of three levels when anaerobiosis began. At several dates, the slurry solution was characterized (pH and organic and mineral compounds) and Mn and Fe oxidation states in solids were assessed. Before incubations, about 20% of the Fe in solids was already reduced, whereas almost all Mn was found as Mn(IV). During the first aerobic period, mobilized metals included Pb, Zn, Ni, Cu, and Cr. After vinasse input during the first 14 d of anaerobiosis, the principal biotransformations were fermentation and true acetogenesis; Fe and Mn were mobilized during this period (up to 4.05 and 6.2 mmol L−1, respectively), and most Mn and an unknown but small fraction of Fe in solids were reduced. During the subsequent 14 d of anaerobiosis, only acetoclastic methanogenesis was observed. The return to aerobic conditions led to rapid oxidative immobilization of Fe, desorption of exchangeable Fe(II), and the partial immobilization of other metals (Ca, Mg, K, Na, Mn, Pb, and Ni). Manganese was not oxidized, and there was no return to the initial conditions for Fe and Mn in solids

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Thierry EliasMartial HaeffelinPhilippe DrobinskiLaurent GomesJerome RangognioThierry BergotPatrick ChazetteJean-Christophe RautMichèle Colomb
• Organismes : Laboratoire de Météorologie Dynamique (UMR 8539) Laboratoire de Météorologie Dynamique (UMR 8539) Laboratoire de Météorologie Dynamique (UMR 8539) Centre national de recherches météorologiques Centre national de recherches météorologiques Centre national de recherches météorologiques Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Chimie Atmosphérique Expérimentale Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Centre d'études techniques de l'équipement de Lyon
• Publié dans Atmospheric Research le 28/10/2020

---

Résumé : A data set acquired by eight particle-dedicated instruments set up on the SIRTA (Site Instrumental de Recherche par Télédétection Atmosphérique, which is French for Instrumented Site for Atmospheric Remote Sensing Research) during the ParisFog field campaign are exploited to document microphysical properties of particles contributing to extinction of visible radiation in variable situations. The study focuses on a 48-hour period when atmospheric conditions are highly variable: relative humidity changes between 50 and 100%, visibility ranges between 65 and 35 000 m, the site is either downwind the Paris area either under maritime influence. A dense and homogeneous fog formed during the night by radiative cooling. In 6 h, visibility decreased down from 30 000 m in the clear-sky regime to 65 m within the fog, because of advected urban pollution (factor 3 to 4 in visibility reduction), aerosol hydration (factor 20) and aerosol activation (factor 6). Computations of aerosol optical properties, based on Mie theory, show that extinction in clear-sky regime is due equally to the ultrafine modes and to the accumulation mode. Extinction by haze is due to hydrated aerosol particles distributed in the accumulation mode, defined by a geometric mean diameter of 0.6 μm and a geometric standard deviation of 1.4. These hydrated aerosol particles still contribute by 20 ± 10% to extinction in the fog. The complementary extinction is due to fog droplets distributed around the geometric mean diameter of 3.2 μm with a geometric standard deviation of 1.5 during the first fog development stage. The study also shows that the experimental set-up could not count all fog droplets during the second and third fog development stages.

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Chantal TriboloNorbert MercierHélène ValladasJean-Louis JoronPierre GuibertYannick LefraisM. SeloJean-Philippe RigaudGuillaume E PorrazCedrik PoggenpoelJohn ParkingtonPierre-Jean TexierArnaud Lenoble
• Organismes : Institut de Recherches sur les Archéomatériaux Institut de Recherches sur les Archéomatériaux Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Géochrononologie Traceurs Archéométrie Laboratoire Pierre Süe Institut de Recherches sur les Archéomatériaux Institut de Recherches sur les Archéomatériaux Laboratoire d'Etude de la Matière Extraterrestre / UMS Nano-analyses De la Préhistoire à l'Actuel : Culture, Environnement et Anthropologie Centre d'Études Préhistoire, Antiquité, Moyen-Age departement of Archaeology departement of Archaeology De la Préhistoire à l'Actuel : Culture, Environnement et Anthropologie Histoire naturelle de l'Homme préhistorique
• Publié dans Journal of Archaeological Science le 01/11/2020

---

Résumé : New excavations have been undertaken at Diepkloof Rock Shelter (DRS; South Africa) since 1999. It is one of the very few sites where Howiesons Poort and Stillbay assemblages can be collected from the same archaeological sequence. These Middle Stone Age techno-complexes are particularly interesting for their affinities with the much younger Later Stone Age facies, and their association with evidence for symbolic behaviour. Establishing their chronology is therefore particularly important for the understanding of the apparition and the evolution of the so-called ‘‘modern'' behaviours. Data already available suggest ages ranging from 55 to 80 ka for the Howiesons Poort and from 70 to 80 ka for the Stillbay techno-complexes in several South African sites. The thermoluminescence dating undertaken at DRS on 22 stone samples originating from the entire stratigraphic record indicates intervals starting 10–50 ka earlier for these techno-complexes in this site. Possible caveats in the dating process are examined but to the best of our current knowledge must be rejected.

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Christophe LengletEmmanuel PradosJean-Philippe PonsRachid DericheOlivier C Faugeras
• Organismes : Siemens Corporate Research Interpretation and Modelling of Images and Videos imagine [Marne-la-Vallée] Computer and biological vision Computer and biological vision
• Publié dans SIAM Journal on Imaging Sciences le 14/12/2016

---

Résumé : We introduce an original approach for the cerebral white matter connectivity mapping from Diffusion Tensor Imaging (DTI). Our method relies on a global modeling of the acquired Magnetic Resonance Imaging (MRI) volume as a Riemannian manifold whose metric directly derives from the diffusion tensor. These tensors will be used to measure physical three-dimensional distances between different locations of a brain diffusion tensor image. The key concept is the notion of geodesic distance that will allow us to find the optimal paths in the white matter, approximating neural fiber bundles. The geodesic distance function can be seen as the solution of two theoretically equivalent but, in practice, signicantly different problems in the Partial Differential Equation framework: An initial value problem which is is intrinsically dynamic, and a boundary value problem which is, on the contrary, intrinsically stationary. The two approaches have very different properties which make them more or less adequate for our problem and more or less computationally efficient. The dynamic formulation is quite easy to implement but has several practical drawbacks. On the contrary, the stationary formulation is much more tedious to implement, however we will show that it has many virtue which make it more suitable for our connectivity mapping problem. Finally, we will present different possible measures of connectivity, reflecting the degree of connectivity between different regions of the brain. We will illustrate these notions on synthetic and real DTI datasets.

---

Fichiers liés : Lenglet-etal-SIIMS-2009_preprint.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Catherine RavanatVirginie WurtzPhilippe OhlmannMarie FichterJean-Pierre CazenaveAlain VandorsselaerFrançois LanzaChristian Gachet
• Organismes :
• Publié dans Analytical biochemistry le 24/11/2023

---

Résumé : The monoclonal antibodies (mAbs) ALMA.17 and ALMA.7 recognize human platelet membrane proteins. ALMA.17 is directed against alpha(IIb)beta(3) integrin, but the target of ALMA.7 was unknown previously. Tandem Biacore micropurification and mass spectrometry (MS) analysis of a platelet membrane lysate was used to identify the target of ALMA.7. Detergent lysates enriched in membrane proteins were perfused over immobilized ALMA.17 or ALMA.7 in a Biacore system. The captured proteins were eluted, concentrated on C3 magnetic beads, and digested with trypsin before nano liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. Critical adjustments needed to be made in (i) the detergent mixture to preserve protein antigenicity and sensor chip integrity and (ii) the method of trypsin digestion to concentrate the proteins and use elution buffers that do not interfere with MS. The target of ALMA.17 was confirmed to be alpha(IIb)beta(3) integrin, whereas that of ALMA.7 was identified as CD226 (PTA-1, DNAM-1, TLiSa-1). This was confirmed by immunoassays comparing ALMA.7 with a commercial anti-CD226 mAb. Thus, a tandem Biacore and nano LC-MS/MS strategy allowed unambiguous identification of an unknown antigen in a complex medium such as a platelet membrane lysate. This strategy may be employed to identify any protein "capturable" on a sensor chip provided that one uses appropriate experimental conditions.

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Marie-Christine Jaffar-BandjeeTrina DasJean-Jacques HoarauPascale Krejbich-TrototMélanie DenizotAnne RiberaPierre RoquesPhilippe Gasque
• Organismes : Groupe de Recherche en Immunopathologies et maladies infectueuses Centre Hospitalier Universitaire de La Réunion Groupe de Recherche en Immunopathologies et maladies infectueuses Groupe de Recherche en Immunopathologies et maladies infectueuses Groupe de Recherche en Immunopathologies et maladies infectueuses Groupe de Recherche en Immunopathologies et maladies infectueuses Groupe de Recherche en Immunopathologies et maladies infectueuses Infectious Diseases Models for Innovative Therapies Université Paris-Sud - Paris 11 Groupe de Recherche en Immunopathologies et maladies infectueuses
• Publié dans Microbes and Infection le 28/10/2020

---

Résumé : Chikungunya virus (CHIKV) causes an acute symptomatic illness with fever, skin rash (hypersensitivity vascultis), incapacitating arthralgia which can evolve to chronic arthritis in elderly patients. Clinical observations from cohort studies have been corroborated with data from experimental infection in several mouse and non-human primate models as discussed herein.

---

Source

---

• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2009
• Auteurs : Philippe ViolierJean-Pierre Lemasson
• Organismes : Espaces et Sociétés

---

Résumé :

La mobilité touristique induit une coprésence problématique. Dans des lieux choisis pour leurs qualités et en fonction de leurs intentions de recréation, les touristes s’installent temporairement. Des enjeux d’appropriation – des lieux par les touristes, du tourisme par les habitants –, tout comme des enjeux économiques et environnementaux, sont dès lors posés dans les territoires… mis en tourisme, écriraient les géographes et les sociologues, dans les destinations, préféreraient dire les gestionnaires et les spécialistes du marketing, à moins qu’il ne s’agisse de «clusters», selon les économistes. Ces «Rendezvous Champlain sur le tourisme», questionnant la rencontre entre touristes, habitants, professionnels du tourisme, etc., ont été l’occasion de plusieurs autres rencontres : entre spécialistes de différentes disciplines, aux outils et analyses différents, et entre chercheurs des deux rives de l’Atlantique. L’ouvrage proposé confronte approches globales et théoriques, démarches sectorielles et études de cas, analyses spatiales consacrées aux métropoles ou, au contraire, aux espaces de faible densité, afin de mieux comprendre la nature et les enjeux de la coprésence à l’œuvre dans les lieux et les espaces touristiques.

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Philippe LaurençotBenoît Perthame
• Organismes : Institut de Mathématiques de Toulouse UMR5219 Laboratoire Jacques-Louis Lions
• Publié dans Communications in Mathematical Sciences le 24/10/2020

---

Résumé : We consider the linear growth-fragmentation equation arising in the modelling of cell division or polymerisation processes. For constant coefficients, we prove that the dynamics converges to the steady state with an exponential rate. The control on the initial data uses an elaborate L¹ -norm that seems to be necessary. It also reflects the main idea of the proof which is to use an anti-derivative of the solution. The main technical difficulty is related to the entropy dissipation rate which is too weak to produce a Poincaré inequality.

---

Fichiers liés : R09003.pdf

---

Source

---

• Type de publi. :
• Date de publi. : 01/01/2009
• Auteurs : Jean SalençonAlexandre MoattiAnne-Marie LézineSerge JanicotPascale BraconnotSerge CleuziouS. KröpelinPaul CaroPhilippe TaquetAndré CapronJacques FröchenEmmanuel Pierrot-Deseilligny
• Organismes : Académie des sciences [Paris, France] Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques Académie des sciences [Paris, France] Académie des sciences [Paris, France] Académie des sciences [Paris, France] Académie des sciences [Paris, France] Académie des sciences [Paris, France]
• Publié dans La lettre de l'Académie des Sciences le 09/03/2009

---

Fichiers liés : 2009_Lettre_AS_25.pdf

---

Source

---

• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2009
• Auteurs : Carole Eyssautier-BavayStéphanie Jean-DaubiasJean-Philippe Pernin
• Organismes : Supporting Interaction and Learning by Experience Modèles et Technologies pour l’Apprentissage Humain Supporting Interaction and Learning by Experience Modèles et Technologies pour l’Apprentissage Humain

---

Résumé : Our research concerns teaching assistant systems. It deals with the question of reuse and exploitation of learners profiles by the different actors of the learning situation; teacher, learner, families, institution or scientist. This paper first describes the difficulties linked to the reuse of heterogeneous existing learners profiles. Then, REPro, a learners profiles management model is proposed. The deployment of this process within a computerized environment is presented as well as the results of first experiments.

---

Fichiers liés : AIED2009_CE_REPro.pdf

---

Source