11 research outputs found
Construction d'une démarche de pilotage d'un systÚme de polyculture-élevage
National audiencePas de résum
Typologie des ripisylves des riviÚres de Guadeloupe, un premier pas vers le développement de techniques de génie végétal avec des espÚces locales
National audienceThe PROTĂGER project aims to promote soil bioengineering techniques to preserve the extreme biodiversity of Guadeloupe's riparian environments, while protecting the population and their property from the risks incurred during river floods and cyclonic events. The first phase of the project consisted in describing the archipelago's riparian zones, in order to know their natural patterns and to be able to draw inspiration from them to develop nature-based solutions. Out of the 270 banks sampled, 302 species, 231 of which were native, were encountered, representing 10% of the local flora, reflecting the highly forested nature of the archipelago and its exceptional diversity. The analysis of these surveys allowed us to define 12 types of riparian vegetation, and to document 80 species that could potentially be used in soil bioengineering. The study presents 30 of them in the form of individual sheets available on the project website with their description, phenology, protection status, ecology, use and conditions of implementation. Beyond the typology and the specific sheets, this work also showed the alarming state of the Guadeloupeâs riparian forests, in particular on the downstream part of the rivers, with habitats degraded by pollution and the presence of invasive alien species.Le projet PROTĂGER vise Ă promouvoir les techniques de gĂ©nie vĂ©gĂ©tal pour prĂ©server lâextrĂȘme biodiversitĂ© des milieux rivulaires de Guadeloupe, tout en protĂ©geant la population et leurs biens, des risques encourus lors des crues de riviĂšre et des Ă©vĂšnements cycloniques. La premiĂšre phase du projet a consistĂ© Ă dĂ©crire les ripisylves de lâarchipel, afin dâen connaitre les modĂšles naturels et de pouvoir sâen inspirer pour dĂ©velopper des solutions fondĂ©es sur la nature. Sur les 270 berges Ă©chantillonnĂ©es, 302 espĂšces dont 231 indigĂšnes ont Ă©tĂ© rencontrĂ©es, soit 10 % de la flore locale, reflĂ©tant la nature trĂšs forestiĂšre de lâarchipel et son exceptionnelle diversitĂ©. Lâanalyse de ces relevĂ©s a permis de dĂ©finir 12 types de ripisylves, et de documenter 80 espĂšces potentiellement utilisables en gĂ©nie vĂ©gĂ©tal. LâĂ©tude prĂ©sente 30 d'entre elles sous forme de fiches individuelles disponibles sur le site internet du projet avec leur description, leur phĂ©nologie, leur statut de protection, leur Ă©cologie, leur usage et leur condition dâutilisation. Au-delĂ de la typologie et des fiches spĂ©cifiques, ce travail a aussi montrĂ© lâĂ©tat alarmant des ripisylves de Guadeloupe, notamment sur la partie aval des cours dâeau, avec des habitats dĂ©gradĂ©s par la pollution et la prĂ©sence dâespĂšces exotiques envahissantes
Platelet function and microparticles levels for patients with paroxysmal and persistent atrial fibrillation including during acute episodes
International audienc
Platelet function and microparticle levels in atrial fibrillation: Changes during the acute episode
Background: Thrombotic risk constitutes a major complication of atrial fibrillation (AF). Platelets and microparti-cles (MPs) are important for hemostasis and thrombosis, however their participation during AF is not well known. The aim of this study was to characterize platelet function and MPs procoagulant and fibrinolytic activity in AF patients and to determine the effects of an acute-AF episode. Methods: Blood was collected from paroxysmal (21) and persistent (16) AF patients referred for AF catheter ab-lation. Ten patients in sinus rhythm for 10 days were induced in AF allowing comparisons of left atrium samples before and after induction. Platelet aggregation with ADP, TRAP, collagen, and ristocetin was studied. Platelet surface expression of PAR-1, αIIbÎČ3, GPIb and P-selectin were evaluated by flow cytometry, and MPs-associated procoagulant and fibrinolytic activity levels were determined by functional assays. Results: A specific reduction in platelet aggregation to TRAP, activating the thrombin receptor PAR-1, was found in all AF patients. No differences in platelet receptor expression were found. Yet, after acute-induced AF, the platelet response was improved. Furthermore, a significant decrease of left atrium tissue factor-dependent procoagulant activity of MPs was observed. Conclusion: Acute episodes of AF results in a decrease in MPs-associated tissue factor activity, possibly corresponding to consumption, which in turn favors coagulation and the local production of thrombin. A decreased platelet basal aggregation to TRAP may result from PAR1 desensitization, whereas the improved response after an induced episode of AF suggests activation of coagulation and PAR1 re-sensitization
Potentiels et verrous d'une filiÚre protéagineuse pour une agriculture durable en Bourgogne
International audienc
New sedimentological, structural and paleo-thermicity data in the Boucheville Basin (eastern North Pyrenean Zone, France)
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