Search results for "Circulation"
showing 10 items of 1137 documents
« Les nouveaux médias et la culture : communication, usages et pratiques de la Gaîté-Lyrique ".
2013
International audience
Qu’est-ce que la circulation transatlantique de la musique ? L’exemple des Beatles et du cinéma
2021
Hyperplastic Conotruncal Endocardial Cushions and Transposition of Great Arteries in Perlecan-Null Mice
2002
Perlecan is a heparan-sulfate proteoglycan abundantly expressed in pericellular matrices and basement membranes during development. Inactivation of the perlecan gene in mice is lethal at two developmental stages: around E10 and around birth. We report a high incidence of malformations of the cardiac outflow tract in perlecan-deficient embryos. Complete transposition of great arteries was diagnosed in 11 out of 15 late embryos studied (73%). Three of these 11 embryos also showed malformations of semilunar valves. Mesenchymal cells in the outflow tract were abnormally abundant in mutant embryos by E9.5, when the endocardial-mesenchymal transformation starts in wild-type embryos. At E10.5, mut…
Stretch-induced Intussuceptive and Sprouting Angiogenesis in the Chick Chorioallantoic Membrane
2014
Vascular systems grow and remodel in response to not only metabolic needs, but also mechanical influences as well. Here, we investigated the influence of tissue-level mechanical forces on the patterning and structure of the chick chorioallantoic membrane (CAM) microcirculation. A dipole stretch field was applied to the CAM using custom computer-controlled servomotors. The topography of the stretch field was mapped using finite element models. After 3 days of stretch, Sholl analysis of the CAM demonstrated a 7-fold increase in conducting vessel intersections within the stretch field (p 0.05). In contrast, corrosion casting and SEM of the stretch field capillary meshwork demonstrated intense …
Prévalence et circulation de pathogènes humains et de bactéries résistantes aux antibiotiques dans l'environnement
2012
National audience; Les sols constituent un réservoir important de biodiversité microbienne. Parmi ces microorganismes, certains sont capables d’interactions avec l’Homme (commensalisme) ou d’induire des pathologies (maladies infectieuses aigues ou chroniques). De plus, les bactéries du sol constituent un réservoir important de gènes de résistance aux antibiotiques. Les activités agricoles comme l’élevage et le recyclage de produits résiduaires organiques dans les sols peuvent constituer une source de bactéries pathogènes, résistantes aux antibiotiques ou commensales de l’Homme. Ces pratiques agricoles, qui sont en constante évolution, doivent donc aussi être évaluées en termes de risque san…
Stress Echocardiography and Strain in Aortic Regurgitation (SESAR protocol): Left ventricular contractile reserve and myocardial work in asymptomatic…
2020
Objectives: To analyze left ventricular (LV) myocardial deformation and contractile reserve (CR) in asymptomatic patients with severe aortic regurgitation (AR) at rest and during exercise, and their correlation with functional capacity. Background: The natural history of chronic AR is characterized by a prolonged silent phase before onset of symptoms and overt LV dysfunction. Assessment of LV systolic function and contractile reserve has an important role in the decision-making of AR asymptomatic patients. Methods: Standard echo, lung ultrasound, and LV 2D speckle tracking strain were performed at rest and during exercise in asymptomatic patients with severe AR and in age- and sex-comparabl…
Pluviométrie et circulation atmosphérique simulées par le modèle régional WRF en Afrique australe : sensibilité à la physique et variabilité interne
2011
This study evaluates the capability of the regional climate model WRF to simulate Southern African rainfall and associated atmospheric circulation, particularly over South Africa, a country covered by a dense network of in situ observations. Three sets of simulations are performed at a 35km horizontal resolution during the core of the austral rainy season (December to February: DJF) with 6-hourly forcings provided by ERA40 reanalysis. The first set quantifies sensitivity of the simulated climate to the parameterizations of atmospheric convection, planetary boundary layer and microphysics. The retained case study (DJF 1993-1994: DJF94) is representative of the South African rainfall climatol…
545. Un período fundamental para la climatología española: el “descubrimiento” de la circulación atmosférica en altitud, 1950-1980
2016
El período que transcurre entre los años 1950 y 1980 resulta decisivo para la consolidación de la climatología española. Los trabajos de una serie de geógrafos españoles (López Gómez, García Fernández, Gil Olcina, Burriel de Orueta, Albentosa Sánchez y Capel Molina) se convertirán en referencias básicas al presentar en nuestro país los avances sobre la circulación atmosférica en las capas altas de la troposfera que se desarrollan después de la 2a Guerra Mundial en Estados Unidos y otros países europeos. Este trabajo analiza el contexto científico en el que tiene lugar el “descubrimiento” de la circulación atmosférica en altitud por parte de la geografía española y su repercusión para la mej…
Multicenter Consistency Assessment of Valvular Flow Quantification With Automated Valve Tracking in 4D Flow CMR
2021
OBJECTIVES This study determined: 1) the interobserver agreement; 2) valvular flow variation; and 3) which variables independently predicted the variation of valvular flow quantification from 4-dimensional (4D) flow cardiac magnetic resonance (CMR) with automated retrospective valve tracking at multiple sites. BACKGROUND Automated retrospective valve tracking in 4D flow CMR allows consistent assessment of valvular flow through all intracardiac valves. However, due to the variance of CMR scanners and protocols, it remains uncertain if the published consistency holds for other clinical centers. METHODS Seven sites each retrospectively or prospectively selected 20 subjects who underwent whole …
Le projet COCKTAIL : une approche pluridisciplinaire de la circulation des discours sur Twitter
2021
International audience