Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Carine LaurentJean-Pierre PougetPhilippe Voisin
• Organismes : Aliments Bioprocédés Toxicologie Environnements Institut de recherche en cancérologie de Montpellier Service de RadioBiologie et d'Epidémiologie
• Publié dans Radiation Research le 27/10/2020

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Résumé : Laurent, C., Pouget, J-P. and Voisin, P. Modulation of DNA Damage by Pentoxifylline and ␣-Tocopherol in Skin Fibro-blasts Exposed to Gamma Rays. Radiat. Res. 163, 000-000 (2005). Previous in vivo studies showed the combination pentoxi-fylline (PTX) and ␣-tocopherol was highly efficient in reducing late radiation-induced skin damage. The present work aimed at investigating the molecular and cellular mechanisms involved in the effects of this combination. Primary cultures of confluent dermal fibroblasts were ␥-irradiated in the presence of PTX and trolox (Tx), the water-soluble analogue of ␣-tocopherol. Drugs were added either before or after radiation exposure and were maintained over time. Their anti-oxidant capacity and their effect on radiation-induced ROS production was assessed together with cell viability and clon-ogenicity. DNA damage formation was assessed by the alkaline comet assay and by the micronucleus (MN) test. Cell cycle distribution was also determined. The combination of PTX/ Tx was shown to reduce both immediate and late ROS formation observed in cells after irradiation. Surprisingly, decrease in DNA strand breaks measured by the comet assay was observed any time drugs were added. In addition, the micronucleus test revealed that for cells irradiated with 10 Gy, a late significant increase in MN formation occurred. The combination of PTX/Tx was shown to be antioxidant and to decrease radiation-induced ROS production. The observed effects on DNA damage at any time the drugs were added suggest that PTX/Tx could interfere with the DNA repair process. ᭧

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Philippe MoulisMatthieu Fontaine
• Organismes : Religions et croyances LAboratoire de Recherche Historique Rhône-Alpes - UMR5190
• Publié dans Bulletin historique du Haut-Pays le 10/12/2019

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Cristina ToninelliMatthieu WyartLudovic BerthierGiulio BiroliJean-Philippe Bouchaud
• Organismes : Laboratoire de Physique Théorique de l'ENS [École Normale Supérieure] Service de physique de l'état condensé Laboratoire des colloïdes, verres et nanomatériaux Service de Physique Théorique Service de physique de l'état condensé
• Publié dans Physical Review E : Statistical, Nonlinear, and Soft Matter Physics [2001-2015] le 01/11/2020

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Résumé : We compute analytically and numerically the four-point correlation function that characterizes non-trivial cooperative dynamics in glassy systems within several models of glasses: elasto-plastic deformations, mode-coupling theory (MCT), collectively rearranging regions (CRR), diffusing defects and kinetically constrained models (KCM). Some features of the four-point susceptibility chi_4(t) are expected to be universal. at short times we expect an elastic regime characterized by a t or sqrt{t} growth. We find both in the beta, and the early alpha regime that chi_4 sim t^mu, where mu is directly related to the mechanism responsible for relaxation. This regime ends when a maximum of chi_4 is reached at a time t=t^* of the order of the relaxation time of the system. This maximum is followed by a fast decay to zero at large times. The height of the maximum also follows a power-law, chi_4(t^*) sim t^{*lambda}. The value of the exponents mu and lambda allows one to distinguish between different mechanisms. For example, freely diffusing defects in d=3 lead to mu=2 and lambda=1, whereas the CRR scenario rather predicts either mu=1 or a logarithmic behaviour depending on the nature of the nucleation events, and a logarithmic behaviour of chi_4(t^*). MCT leads to mu=b and lambda =1/gamma, where b and gamma are the standard MCT exponents. We compare our theoretical results with numerical simulations on a Lennard-Jones and a soft-sphere system. Within the limited time-scales accessible to numerical simulations, we find that the exponent mu is rather small, mu < 1, with a value in reasonable agreement with the MCT predictions.

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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 Service de physique de l'état condensé Service de physique de l'état condensé
• 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 nonluminescent 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 semiconducting nanotubes. Interband and intersubband relaxation times are about one order of magnitude slower in isolated nanotubes than in ropes of nanotubes bringing evidence of the environmental influence on the carrier dynamics. The relaxation dynamics is nonexponential 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 previously 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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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2005
• Auteurs : Jean MartinetYves ChiaramellaPhilippe Mulhem
• Organismes : Modélisation et Recherche d’Information Multimédia [Grenoble] Modélisation et Recherche d’Information Multimédia [Grenoble] Modélisation et Recherche d’Information Multimédia [Grenoble]

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Résumé : The paper presents a contribution to image indexing consisting in a weighting model for visible objects - or image objects - in home photographs. To improve its effectiveness this weighting model has been designed according to human perception criteria about what is estimated as important in photographs. Four basic hypotheses related to human perception are presented, and their validity is estimated as compared to actual observations from a user study. Finally a formal definition of this weighting model is presented and its consistence with the user study is evaluated.

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Fichiers liés : p760-martinet.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Julien CharreauYan ChenStuart A. GilderStéphane DominguezJean‐philippe AvouacŞevket ŞenDongjiang SunYongan LifWei-Ming Wang
• Organismes : Institut des Sciences de la Terre d'Orléans Institut des Sciences de la Terre d'Orléans Institut de Physique du Globe de Paris Laboratoire Dynamique de la Lithosphère Caltech Division of Geological and Planetary Sciences Paléobiodiversité et paléoenvironnements Institute of Geology and Mineral Resources, Bureau of Geology and Mineral Resources of Xinjiang Uygur Autonomous Region Institute of Geology and Mineral Resources, Bureau of Geology and Mineral Resources of Xinjiang Uygur Autonomous Region Department of Palaeobotany and Palynology, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences
• Publié dans Earth and Planetary Science Letters le 01/11/2020

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Résumé : In order to better constrain the tectonic evolution of central Asia under the influence of the India–Asia collision, we carried out a magnetostratigraphic study at the Kuitun He section, on the northern flank of the Tianshan range (northwest China). A total of 801 samples were collected from a 1559-m-thick section, which is composed mainly of fluvio-lacustrine sandstone and conglomerate. Stepwise thermal and alternating field demagnetization isolated a linear magnetization component that decays univectorally toward the origin and likely represents a primary magnetization principally carried by magnetite. From this component, 29 magnetic polarity intervals were identified. They correlate between 3.1 and 10.5 Ma with the reference magnetic polarity time scale, indicating a relatively constant sedimentation rate with an average of 0.21±0.01 mm/year. We also performed a suite of rock magnetic experiments designed to track time-transgressive changes in the sedimentary record. From the rock magnetic parameters, together with the constant sedimentation rate, we conclude that the Tianshan mountains were actively uplifting by 10.5 Ma.

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Fichiers liés : Charreau-Earth-2005.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Ivan FaveroGuillaume CassaboisAleksandar JankovicRobson FerreiraDavid DarsonChristophe VoisinClaude DelalandePhilippe RoussignolAntonio BadolatoPierre PetroffJ.-M. Gérard
• Organismes : Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Materials Department and Electrical and Computer Engineering Department Materials Department and Electrical and Computer Engineering Department Nanophysique et Semiconducteurs
• Publié dans Applied Physics Letters le 01/11/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Sébastien MoyneJacques ThierryDidier MarchandPhilippe NicolleauJean-Pierre PineauPhilippe CourvilleThomas Saucède
• Organismes : Biogéosciences [UMR 5561] [Dijon] Biogéosciences [UMR 5561] [Dijon] Biogéosciences [UMR 5561] [Dijon] Géosciences Rennes Laboratoire de Géodynamique des Chaines Alpines
• Publié dans Geobios le 25/10/2020

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Résumé : La classification des espèces du genre Nucleolites de l'intervalle Bajocien­Oxfordien du bassin de Paris est révisée. Une vision classique, jusqu'alors utilisée par les auteurs et fondée principalement sur la morphologie générale du test, est tout d'abord présentée. Elle est ensuite modifiée à partir de nouvelles données architecturales se référant au modèle extraxial­axial concernant la structure de l'appareil apical ainsi que la présence de plaques supplémentaires et de plaques caténales. Ces données architecturales sont considérées comme prioritaire vis-à-vis de la morphologie générale du test. Cette approche conduit à une nouvelle vision de la classification des espèces au sein du genre Nucleolites. La systématique est en particulier considérablement simplifiée. Les hypothèses phylogénétiques déduites et proposées montrent que le genre Nucleolites est composé de deux lignées parallèles dès l'origine du genre au Bajocien : un groupe à architecture dite « primitive » et un groupe à architecture dite « évoluée ». À partir du Callovien supérieur, les espèces présentant une architecture primitive donnent naissance à des espèces de type évolué, qui persistent seules. Dans cette optique, le genre Nucleolites serait paraphylétique à partir du Callovien supérieur.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Alexandre RuasPhilippe MoisyJean-Pierre SimoninOlivier BernardJean-François DufrêchePierre Turq
• Organismes : Laboratoire de Chimie des Actinides Laboratoire de Chimie des Actinides Liquides Ioniques et Interfaces Chargées Liquides Ioniques et Interfaces Chargées Liquides Ioniques et Interfaces Chargées Liquides Ioniques et Interfaces Chargées
• Publié dans Journal of Physical Chemistry B le 22/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2005
• Auteurs : Philippe NédélecValérie ThouretJérôme BrioudeBastien SauvageJ.-P. CammasAndreas Stohl
• Organismes : Laboratoire d'aérologie Laboratoire d'aérologie Laboratoire d'aérologie Laboratoire d'aérologie Laboratoire d'aérologie Norwegian Institute for Air Research
• Publié dans Geophysical Research Letters le 25/10/2020

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Résumé : This paper analyses 320 MOZAIC (Measurements of Ozone aboard Airbus in-service airCraft) flights between Europe and East Asia in the year 2003. Carbon monoxide (CO) measurements in the upper troposphere (UT) clearly show the influence of plumes from boreal forest fires burning around Lake Baikal between April and July. On many flights, CO concentrations were above 300 ppbv over several hundred kilometers, with values above 500 ppbv over 50 kilometers and peaks up to 800 ppbv. To our knowledge, such high UT CO concentrations have never been reported before. A case study reveals that biomass burning plumes were rapidly transported by a warm conveyor belt. On the regional and seasonal scale, MOZAIC monthly-mean concentrations were above 150 ppbv on average, i.e. 30% above the northern hemisphere background as determined over Europe.

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Fichiers liés : Nedelec2005.pdf

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