Search results for "cycle"
showing 10 items of 3119 documents
Left-Ventricle Segmentation of SPECT Images of Rats
2015
Single-photon emission computed tomography (SPECT) imaging of the heart is helpful to quantify the left-ventricular ejection fraction and study myocardial perfusion scans. However, these evaluations require a 3-D segmentation of the left-ventricular wall on each phase of the cardiac cycle. This paper presents a fast and interactive graph cut method for 3-D segmentation of the left ventricle (LV) of rats in SPECT images. The method is carried out in three steps. First, 3-D sampling of the LV cavity is made in a spherical-cylindrical coordinate system. Then, a graph-cut-based energy minimization procedure provides delineation of the myocardium centerline surface. From there, it is possible to…
Restitution de l’atelier 1 : Services écosystémiques recherchés relatifs aux cycles C,N ,P
2013
La faune du sol tropicale, un facteur de régulation des communautés bactériennes liées aux émissions de gaz à effet de serre
2009
Nuclear involvement of the Cell Division Cycle 48 protein during the plant immune response
2023
The control of protein homeostasis, a balance between their synthesis and degradation, also called proteostasis, is essential for cell survival. Any imbalance of the proteome, for instance triggered by a stress, leads to an accumulation of misfolded proteins leading to proteotoxic stress that can induce cell death. The ubiquitin proteasome system (UPS) is a major actor in the selective degradation of misfolded proteins to preserve proteome balance.The chaperone-like Cdc48 is a member of the AAA+ ATPase enzyme family which isconserved in mammals (VCP), yeasts and plants (Cdc48: Cell Division Cycle 48/p97).Cdc48/VCP is a cytosolic and nuclear protein which segregates misfolded proteins fromsu…
Optimisation du pyroséquençage haut-débit pour caractériser la diversité taxonomique des communautés bactériennes des sols
2012
La diversité microbienne d’un sol (que l’on estime à 100000 à 1000000 d’espè ces différentes par gramme de sol) est difficile à caractériser. Toutefois, d’importantes avancé es en biologie moléculaire (comme le développement du pyrosé quençage), ont permis d'obtenir plusieurs centaines de milliers de sé quences à partir d’un ADN métagénomique, permettant une meilleure caracté risation de la diversité des communautés microbiennes du sol. Toutefois, dans un contexte ou l’écologie microbienne du sol commence à s’accaparer les é chantillonnages de grande envergure (spatial et temporelle) afin de mieux hié rarchiser les processus et paramètres impliqués dans la diversification de ces communauté …
Fonctionnement des cycles biogéochimiques et communautés microbiennes rhizosphériques : quels enjeux ?
2010
ALOMYSIS: la modélisation pour gérer les populations de vulpin
2009
National audience; Comment contrôler les graminées, et en particulier le vulpin, sans avoir recours aux herbicides ? En combinant un maximum de techniques. Un modèle mathématique mis au point par l’INRA permet de simuler l’impact de la succession culturale et des itinéraires techniques sur les populations de vulpin.
Contribution of bacteria to initial input and cycling of nitrogen in soils
2005
Mapping spatial patterns of denitrifiers at large scale
2010
Little information is available regarding the landscape-scale distribution of microbial communities and its environmental determinants. Here we combined molecular approaches and geostatistical modeling to explore spatial patterns of the denitrifying community at large scales. The distribution of denitrifrying community was investigated over 107 sites in Burgundy, a 31 500 km2 region of France, using a 16 X 16 km sampling grid. At each sampling site, the abundances of denitrifiers and 42 soil physico-chemical properties were measured. The relative contributions of land use, spatial distance, climatic conditions, time and soil physico-chemical properties to the denitrifier spatial distributio…
How agricultural practices affect the different bacterial communities involved in the denitrification process: the case of direct seeding in Madagasc…
2007
International audience