Gestion péri opératoire d’un paragangliome rétro-péritonéal

Nous rapportons l'observation d'un patient âgé de 62 ans qui présente des douleurs abdominales avec une masse du flanc droit. Les explorations morphologiques ainsi que les données biologiques ont permis de faire le diagnostic d'un paragangliome secrétant. Les particularités diagnostiques ainsi que la gestion périopératoire sont envisagées

Basin tectonic history and paleo-physiography of the pelagian platform, northern Tunisia, using vitrinite reflectance data

Constraining the thermal, burial and uplift/exhumation history of sedimentary basins is crucial in the understanding of upper crustal strain evolution and also has implications for understanding the nature and timing of hydrocarbon maturation and migration. In this study, we use Vitrinite Reflectance (VR) data to elucidate the paleo‐physiography and thermal history of an inverted basin in the foreland of the Atlasic orogeny in Northern Tunisia. In doing so, it is the primary aim of this study to demonstrate how VR techniques may be applied to unravel basin subsidence/uplift history of structural domains and provide valuable insights into the kinematic evolution of sedimentary basins. VR measurements of both the onshore Pelagian Platform and the Tunisian Furrow in Northern Tunisia are used to impose constraints on the deformation history of a long‐lived structural feature in the studied region, namely the Zaghouan Fault. Previous work has shown that this fault was active as an extensional structure in Lower Jurassic to Aptian times, before subsequently being inverted during the Late Cretaceous Eocene Atlas I tectonic event and Upper Miocene Atlas II tectonic event. Quantifying and constraining this latter inversion stage, and shedding light on the roles of structural inheritance and the basin thermal history, are secondary aims of this study. The results of this study show that the Atlas II WNW‐ESE compressive event deformed both the Pelagian Platform and the Tunisian Furrow during Tortonian‐Messinian times. Maximum burial depth for the Pelagian Platform was reached during the Middle to Upper Miocene, i.e. prior to the Atlas II folding event. VR measurements indicate that the Cretaceous to Ypresian section of the Pelagian Platform was buried to a maximum burial depth of ~3 km, using a geothermal gradient of 30°C/km. Cretaceous rock samples VR values show that the hanging wall of the Zaghouan Fault was buried to a maximum depth of <2 km. This suggests that a vertical km‐scale throw along the Zaghouan Fault pre‐dated the Atlas II shortening, and also proves that the fault controlled the subsidence of the Pelagian Platform during the Oligo‐Miocene. Mean exhumation rates of the Pelagian Platform throughout the Messinian to Quaternary were in the order of 0.3 mm/year. However, when the additional effect of Tortonian‐Messinian folding is accounted for, exhumation rates could have reached 0.6-0.7 mm/year

Caractérisation ionique et isotopique d'un système hydrologique tropical : la lagune Ebrié (Côte d'Ivoire)

La lagune Ebrié (Côte d'Ivoire) constitue par sa position à la lisière du domaine marin et du domaine continental, un milieu très original d'un triple point de vue : hydrodynamique, géochimique et écologique. Les apports d'eau d'origine terrestre ou marine confèrent à la lagune une grande diversité de milieux en relation étroite avec les phénomènes hydrodynamiques qui commandent la qualité chimique des eaux, la fréquence de leur renouvellement et dans une certaine mesure le développement des processus d'eutrophisation. Les analyses effectuées concernent une cinquantaine de points de prélèvements. Elles portent essentiellement sur les éléménts majeurs (Cl-, Na+, K+, Ca++, Mg++) et sur l'oxygène 18. L'interprétation des résultats globaux conduit à identifier cinq ensembles bien individualisés : la lagune d'Ono ..., la zone estuarienne vraie ..., la zone para-estuarienne ..., la partie ouest de la lagune ..., les lagunes Aghien et Poto

Pollution diffuse et gestion du milieu agricole: transferts compares de phosphore et d'azote dans un petit bassin versant agricole

National audienc

Concentration and delta 13C of leaf carbohydrates in relation to gas exchange in Quercus robur under elevated CO2 and drought

International audienc

Dynamique du phosphore dans les bassins versants : importance des phenomenes de retention dans les sediments

National audienc

Genetic and environmental determinants of water-use efficiency and carbon isotope discrimination in forest trees

International audienc

Growth, gas exchange and carbon isotope discrimination in young Prunus avium trees growing with or without individual lateral shelters

One-yr-old wild cherry (Prunus avium L) plants were grown as follows: 1) in small cylindrical shelters (diameter 50 cm, treatment S); 2) in large shelters (diameter 100 cm, treatment L); or 3) without shelter (control, treatment C) during 1 growing season. Treatment C was characterized by higher values of photosynthetic photon flux density (Ip) and of leaf-to-air water vapour pressure difference (ΔW) than treatments L and S. The plants were taller in treatments L and S than in treatment C but biomass production was higher in the latter treatment. The plants of treatment C were also characterized by higher values of CO2 assimilation rate (A) and of leaf mass per unit area (LMA, ratio of leaf mass to leaf area). Relative carbon isotope composition (δp) of the leaves was higher in treatment C than in treatments L and S, which expresses higher time-integrated values of plant intrinsinc water-use efficiency (A/g ratio) in the former treatment. There was a positive correlation between δ p and LMA. Thus, LMA, a readily measurable parameter, is a relevant parameter for understanding and modelling water-use efficiency of canopies.Croissance, échanges gazeux et discrimination isotopique du carbone de jeunes merisiers (Prunus avium L) placés ou non dans des abris latéraux individuels. Des plants de merisier (Prunus avium L) âgés de 1 an ont été installés durant une saison de végétation dans 1) des petits abris cylindriques (diamètre 50 cm, traitement S); 2) des grands abris cylindriques (diamètre 100 cm, traitement L); ou 3) sans abri en plein découvert (traitement C) (fig 1). Le traitement C était caractérisé par des valeurs plus élevées de rayonnement photosynthétiquement actif (Ip) ainsi que de différence de pression partielle de vapeur d'eau entre feuille et atmosphère (ΔW) (fig 3). La croissance en hauteur était plus élevée pour les plants du traitement C que pour ceux des traitements L et S, alors que la production de biomasse était la plus élevée dans le traitement C (tableau I). Les plants du traitement C étaient également caractérisés par des valeurs plus élevées de taux d'assimilation de CO2 (A) (fig 5) ainsi que de masse foliaire spécifique (LMA, rapport de la masse sur la surface foliaire) (fig 8). La composition isotopique relative en carbone (δp) des feuilles était plus élevée dans le traitement C que dans les traitements L et S (fig 8). Cela traduit des valeurs intégrées dans le temps d'efficience intrinsèque d'utilisation de l'eau (rapport A/g) plus élevées pour le traitement C (tableau I). On a noté une corrélation positive entre δp et LMA (fig 8). Ainsi, LMA, qui est une grandeur facilement mesurable, constitue un paramètre pertinent pour la compréhension et la modélisation de l'efficience d'utilisation de l'eau des couverts végétaux

Second law analysis of mhd forced convective nanoliquid flow through a two-dimensional channel

The present study deals with fluid flow, heat transfer and entropy generation in a two-dimensional channel filled with Cu–water nanoliquid and containing a hot block. The nanoliquid flow is driven along the channel by a constant velocity and a cold temperature at the inlet, and the partially heated horizontal walls. The aim of this work is to study the influence of the most important parameters such as nanoparticle volume fraction (0%≤ϕ≤4%), nanoparticle diameter (5 nm≤dp≤55 nm), Reynolds number (50≤Re≤200), Hartmann number (0≤Ha≤90), magnetic field inclination angle (0≤γ≤π) and Brownian motion on the hydrodynamic and thermal characteristics and entropy generation. We used the lattice Boltzmann method (LBM: SRT-BGK model) to solve the continuity, momentum and energy equations. The obtained results show that the maximum value of the average Nusselt number is found for case (3) when the hot block is placed between the two hot walls. The minimum value is calculated for case (2) when the hot block is placed between the two insulated walls. The increase in Reynolds and Hartmann numbers enhances the heat transfer and the total entropy generation. In addition, the nanoparticle diameter increase reduces the heat transfer and the irreversibility, the impact of the magnetic field inclination angle on the heat transfer and the total entropy generation is investigated, and the Brownian motion enhances the heat transfer and the total entropy generation