La salive de la sangsue Hirudo medicinalis (effets pharmacologiques et applications thérapeutiques)

CHATENAY M.-PARIS 11-BU Pharma. (920192101) / SudocSudocFranceF

Free Standing Dry and Stable Nanoporous Polymer Films Made through Mechanical Deformation

Abstract A new straight forward approach to create nanoporous polymer membranes with well defined average pore diameters is presented. The method is based on fast mechanical deformation of highly entangled polymer films at high temperatures and a subsequent quench far below the glass transition temperature Tg. The process is first designed generally by simulation and then verified for the example of polystyrene films. The methodology does not need any chemical processing, supporting substrate, or self assembly process and is solely based on polymer inherent entanglement effects. Pore diameters are of the order of ten polymer reptation tube diameters. The resulting membranes are stable over months at ambient conditions and display remarkable elastic properties

Removal of acorns of the alien oak Quercus rubra on the ground by scatter-hoarding animals in Belgian forests

Description du sujet. Quercus rubra L. est considéré comme une espèce invasive dans plusieurs pays d'Europe. Cependant, sa dispersion dans l'aire d'introduction est peu documentée. Objectifs. Nous avons observé si les glands au sol étaient déplacés par les animaux et identifié les animaux impliqués. Méthode. Durant deux automnes consécutifs, le prélèvement des glands de Q. rubra et d'une espèce de chêne indigène a été évalué chaque semaine dans différents sites en Belgique. Grâce à des pièges photographiques, les animaux prélevant des glands ont été identifiés. Résultats. Les glands de Q. rubra ont été prélevés par le mulot sylvestre (Apodemus sylvaticus L.), l'écureuil roux (Sciurus vulgaris L.), le rat (Rattus sp.) et le sanglier (Sus scrofa L.). Les deux premiers sont des rongeurs accumulateurs-disperseurs, considérés comme disperseurs potentiels. Conclusions. La dispersion des glands de Q. rubra en Europe occidentale par les animaux accumulateurs-disperseurs pourrait aider l'espèce à coloniser progressivement les écosystèmes forestiers.Description of the subject. Quercus rubra L. is considered an invasive species in several European countries. However, little is known about its dispersal in the introduced range. Objectives. We investigated the significance of animal dispersal of Q. rubra acorns on the ground by vertebrates in its introduced range, and identified the animal species involved. Method. During two consecutive autumns, the removal of acorns from Q. rubra and from a native oak was assessed weekly in forest sites in Belgium. We used automated detection camera traps to identify the animals that removed acorns. Results. Quercus rubra acorns were removed by wood mice (Apodemus sylvaticus L.), red squirrels (Sciurus vulgaris L.), rats (Rattus sp.), and wild boars (Sus scrofa L.). The two former are scatter-hoarding rodents and can be considered potential dispersers. Conclusions. Dispersal of Q. rubra acorns in Western Europe by scatter-hoarding animals may help the species increasingly colonize forest ecosystems

Prélèvement au sol des glands d’une espèce de chêne exotique (Quercus rubra) par des animaux accumulateurs-disperseurs dans les forêts belges

Description of the subject. Quercus rubra L. is considered an invasive species in several European countries. However, little is known about its dispersal in the introduced range. Objectives. We investigated the significance of animal dispersal of Q. rubra acorns on the ground by vertebrates in its introduced range, and identified the animal species involved. Method. During two consecutive autumns, the removal of acorns from Q. rubra and from a native oak was assessed weekly in forest sites in Belgium. We used automated detection camera traps to identify the animals that removed acorns. Results. Quercus rubra acorns were removed by wood mice (Apodemus sylvaticus L.), red squirrels (Sciurus vulgaris L.), rats (Rattus sp.), and wild boars (Sus scrofa L.). The two former are scatter-hoarding rodents and can be considered potential dispersers. Conclusions. Dispersal of Q. rubra acorns in Western Europe by scatter-hoarding animals may help the species increasingly colonize forest ecosystems. © 2017, FAC UNIV SCIENCES AGRONOMIQUES GEMBLOUX. All rights reserved.ANR-10- IDEX-03-0

Removal of acorns of the alien oak Quercus rubra on the ground by scatter-hoarding animals in Belgian forests

Description du sujet. Quercus rubra L. est considéré comme une espèce invasive dans plusieurs pays d'Europe. Cependant, sa dispersion dans l'aire d'introduction est peu documentée. Objectifs. Nous avons observé si les glands au sol étaient déplacés par les animaux et identifié les animaux impliqués. Méthode. Durant deux automnes consécutifs, le prélèvement des glands de Q. rubra et d'une espèce de chêne indigène a été évalué chaque semaine dans différents sites en Belgique. Grâce à des pièges photographiques, les animaux prélevant des glands ont été identifiés. Résultats. Les glands de Q. rubra ont été prélevés par le mulot sylvestre (Apodemus sylvaticus L.), l'écureuil roux (Sciurus vulgaris L.), le rat (Rattus sp.) et le sanglier (Sus scrofa L.). Les deux premiers sont des rongeurs accumulateurs-disperseurs, considérés comme disperseurs potentiels. Conclusions. La dispersion des glands de Q. rubra en Europe occidentale par les animaux accumulateurs-disperseurs pourrait aider l'espèce à coloniser progressivement les écosystèmes forestiers.Description of the subject. Quercus rubra L. is considered an invasive species in several European countries. However, little is known about its dispersal in the introduced range. Objectives. We investigated the significance of animal dispersal of Q. rubra acorns on the ground by vertebrates in its introduced range, and identified the animal species involved. Method. During two consecutive autumns, the removal of acorns from Q. rubra and from a native oak was assessed weekly in forest sites in Belgium. We used automated detection camera traps to identify the animals that removed acorns. Results. Quercus rubra acorns were removed by wood mice (Apodemus sylvaticus L.), red squirrels (Sciurus vulgaris L.), rats (Rattus sp.), and wild boars (Sus scrofa L.). The two former are scatter-hoarding rodents and can be considered potential dispersers. Conclusions. Dispersal of Q. rubra acorns in Western Europe by scatter-hoarding animals may help the species increasingly colonize forest ecosystems

Mechanical Thrombectomy for Acute Ischemic Stroke Amid the COVID-19 Outbreak

International audienceBackground and Purpose: The efficiency of prehospital care chain response and the adequacy of hospital resources are challenged amid the coronavirus disease 2019 (COVID-19) outbreak, with suspected consequences for patients with ischemic stroke eligible for mechanical thrombectomy (MT). Methods: We conducted a prospective national-level data collection of patients treated with MT, ranging 45 days across epidemic containment measures instatement, and of patients treated during the same calendar period in 2019. The primary end point was the variation of patients receiving MT during the epidemic period. Secondary end points included care delays between onset, imaging, and groin puncture. To analyze the primary end point, we used a Poisson regression model. We then analyzed the correlation between the number of MTs and the number of COVID-19 cases hospitalizations, using the Pearson correlation coefficient (compared with the null value). Results: A total of 1513 patients were included at 32 centers, in all French administrative regions. There was a 21% significant decrease (0.79; [95%CI, 0.76–0.82]; P <0.001) in MT case volumes during the epidemic period, and a significant increase in delays between imaging and groin puncture, overall (mean 144.9±SD 86.8 minutes versus 126.2±70.9; P <0.001 in 2019) and in transferred patients (mean 182.6±SD 82.0 minutes versus 153.25±67; P <0.001). After the instatement of strict epidemic mitigation measures, there was a significant negative correlation between the number of hospitalizations for COVID and the number of MT cases ( R 2 −0.51; P =0.04). Patients treated during the COVID outbreak were less likely to receive intravenous thrombolysis and to have unwitnessed strokes (both P <0.05). Conclusions: Our study showed a significant decrease in patients treated with MTs during the first stages of the COVID epidemic in France and alarming indicators of lengthened care delays. These findings prompt immediate consideration of local and regional stroke networks preparedness in the varying contexts of COVID-19 pandemic evolution