Search results for "forme"

Fonctionnement et dynamique des formes ligneuses au sein d'une exploitation agricole. Un raisonnement géo-agronomique

2004

International audience; Les changements dans les systèmes de production génèrent une réorganisation spatiale des pratiques au sein des exploitations agricoles. Celle-ci a un effet direct sur l’organisation du parcellaire. Face à cette dynamique se pose la question de l’évolution des formes ligneuses et aussi de leur rôle dans le fonctionnement d’exploitations modifiant leurs pratiques agricoles et leur système de production. À partir de l’étude d’une exploitation agricole, ce travail expose le double regard porté par le géographe et l’agronome sur la question de la place qu’occupe la végétation ligneuse et de son rôle sur le fonctionnement de l’exploitation.

Singuliers généralistes. Sociologie de la médecine générale.

2010

International audience; Chacun de nous connaît un médecin généraliste, en qui il peut trouver un interlocuteur privilégié pour ses soucis de santé. En tant que groupe professionnel pourtant, les généralistes ont longtemps été peu considérés dans notre système de soins et restent méconnus : que sait-on des façons d'être généraliste ? de l'évolution de la profession ? Souvent passionnés par leur métier vécu comme un engagement personnel, les médecins généralistes sont-ils satisfaits de leurs conditions de travail et de leur place dans la société? À partir d'enquêtes récentes, des sociologues expliquent ce que sont et font les généralistes dans leur cabinet, ils analysent les "flous du métier"…

Quantitative Analysis of Prion-Protein Degradation by Constitutive and Immuno-20S Proteasomes Indicates Differences Correlated with Disease Susceptib…

2004

Abstract The main part of cytosolic protein degradation depends on the ubiquitin-proteasome system. Proteasomes degrade their substrates into small peptide fragments, some of which are translocated into the endoplasmatic reticulum and loaded onto MHC class I molecules, which are then transported to the cell surface for inspection by CTL. A reliable prediction of proteasomal cleavages in a given protein for the identification of CTL epitopes would benefit immensely from additional cleavage data for the training of prediction algorithms. To increase the knowledge about proteasomal specificity and to gain more insight into the relation of proteasomal activity and susceptibility to prion diseas…

Peroxisomal and mitochondrial status of two murine oligodendrocytic cell lines (158N, 158JP): potential models for the study of peroxisomal disorders…

2009

International audience; In some neurodegenerative disorders (leukodystrophies) characterized by myelin alterations, the defect of peroxisomal functions on myelin-producing cells (oligodendrocytes) are poorly understood. The development of in vitro models is fundamental to understanding the physiopathogenesis of these diseases. We characterized two immortalized murine oligodendrocyte cell lines: a normal (158N) and a jimpy (158JP) cell line mutated for the proteolipid protein PLP/DM20. Fluorescence microscopy, flow cytometry, and western blotting analysis allow to identify major myelin proteins (PLP colocalizing with mitochondria; myelin basic protein), oligodendrocyte (CNPase and myelin oli…

Insights in ChAdOx1 nCoV-19 vaccine-induced immune thrombotic thrombocytopenia

2021

Abstract SARS-CoV-2 vaccine ChAdOx1 nCoV-19 (AstraZeneca) causes a thromboembolic complication termed vaccine-induced immune thrombotic thrombocytopenia (VITT). Using biophysical techniques, mouse models, and analysis of VITT patient samples, we identified determinants of this vaccine-induced adverse reaction. Super-resolution microscopy visualized vaccine components forming antigenic complexes with platelet factor 4 (PF4) on platelet surfaces to which anti-PF4 antibodies obtained from VITT patients bound. PF4/vaccine complex formation was charge-driven and increased by addition of DNA. Proteomics identified substantial amounts of virus production-derived T-REx HEK293 proteins in the ethyle…

La sépulture campaniforme d'enfant de la grotte Murée (Montagnac-Montpezat, Alpes-de-Haute-Provence)

2011

Topical treatment with pterostilbene, a natural phytoalexin, effectively protects hairless mice against UVB radiation-induced skin damage and carcino…

2015

Abstract The aim of our study was to investigate in the SKH-1 hairless mouse model the effect of pterostilbene (Pter), a natural dimethoxy analog of resveratrol (Resv), against procarcinogenic ultraviolet B radiation (UVB)-induced skin damage. Pter prevented acute UVB (360 mJ/cm2)-induced increase in skin fold, thickness, and redness, as well as photoaging-associated skin wrinkling and hyperplasia. Pter, but not Resv, effectively prevented chronic UVB (180 mJ/cm2, three doses/week for 6 months)-induced skin carcinogenesis (90% of Pter-treated mice did not develop skin carcinomas, whereas a large number of tumors were observed in all controls). This anticarcinogenic effect was associated wit…

CD40 ligation protects bronchial epithelium against oxidant-induced caspase-independent cell death.

2006

KEYWORDS CLASSIFICATION: 7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxide;Antigens,CD40;Apoptosis;Bronchi;cytology;Caspases;Cell Cycle;Cell Death;Cell Line,Transformed;Cell Survival;Cell Transformation,Viral;Cytoprotection;drug effects;Epithelial Cells;Humans;Italy;mechanisms of carcinogenesis;metabolism;Oxidants;pharmacology;physiology;Research;Simian virus 40;toxicity;Transcription Factor AP-1. CD40 and its ligand regulate pleiotropic biological responses, including cell proliferation, differentiation, and apoptosis. In many inflammatory lung diseases, tissue damage by environmental or endogenous oxidants plays a major role in disease pathogenesis. As the epithelial barrier is a major t…

Respuesta a “Fumador, exfumador y COVID-19”

2021

COVID-19 y tabaquismo: revisión sistemática y metaanálisis de la evidencia

2021

RESUMEN Objetivo: el objetivo del estudio ha sido responder a las siguientes preguntas: ¿Se asocia el consumo de tabaco en pacientes con Covid-19 con una progresión negativa y desenlace adverso de la enfermedad? y, ¿se asocia el consumo de tabaco, actual y pasado, a una mayor posibilidad de desarrollar COVID-19? Material y Métodos: Se realizó una revisión sistemática (RS) y metaanálisis (MA) de trabajos publicados previamente. La estrategia de búsqueda incluyó todos los descriptores conocidos sobre Covid-19 y tabaco y se realizó en diferentes bases de datos. Se utilizaron modelos estadísticos adecuados para abordar el tamaño del efecto en un metaanálisis: modelo de efectos aleatorios y de e…