Le pyomètre chez la chienne (étude de l'étiopahogénie et actualités thérapeutiques)

Le pyomètre se caractérise par l accumulation de pus dans l utérus. Cette affection concerne les chiennes non castrées âgées de 8 ans en moyenne et se déclare en metœstrus. Les signes cliniques, assez frustres, sont à l origine d un diagnostic tardif. L évolution est fatale sans traitement. Cette étude bibliographique fait le point sur les données actuelles concernant l étiologie complexe de cette affection. Ensuite, les nouvelles options thérapeutiques, notamment médicales, sont détaillées.TOULOUSE-EN Vétérinaire (315552301) / SudocNANTES-Ecole Nat.Vétérinaire (441092302) / SudocSudocFranceF

The distribution of biogenic silica and the composition of particulate organic matter in the Weddell—Scotia Sea during spring 1988

International audienceDuring EPOS 2 (European Polarstern Study, leg 2, 26 November 1988–5 January 1989 the distribution of biogenic silica (BSi) was determined from the surface to 600 m along two transects (49°W and 47°W) spanning the Scotia Sea, the Weddell—Scotia Confluence (WSC) and the marginal ice zone (MIZ) of the Weddell Sea. Particulate organic carbon (POC), particulate organic nitrogen (PON) and chlorophyll a concentrations were determined in parallel in surface (10m) samples. In the 0–100 m layer, the distribution of particulate biogenic silica (BSi) showed little correlation with the meltwater field in late November. High BSi concentrations were measured at the end of November in the Weddell—Scotia Confluence (maximum 4.8 μmol l−1), and early in January in the Antarctic Circumpolar Current (maximum at 8.2 μmol l−1) where the wind-mixed layer was only 35 m, creating favourable conditions for phytoplankton growth. However, maximum and mean biogenic silica values remained fairly low as compared with those reported for the Ross Sea. This relatively low silica content of the 0–100 m layer appears to be mainly due to intense grazing which resulted in rapid exportation of particulate material towards the deeper layers. The mean POC/PON molar ratio was 5.5, i.e. significantly lower than the usual Redfield ratio. BSi/POC molar ratios ranged from 0.01 to 0.61, the highest values being found in the Scotia Sea, where siliceous phytoplankton was dominant. The high BSi/POC ratios confirm that diatoms in Antarctic Ocean are able to incorporate unusually high amounts of Si relative to carbon, as compared with other ecosystems

Activités marchandes et pratiques de la frontière

Coordination éditoriale : Hervé Flanquar

Mini and micro-resonators for the generation of high spectral purity microwave signals

accessible sur http://minap2012.fbk.euInternational audienceOptoelectronic Oscillators (OEOs) are an attractive alternative to electrical solutions for the generation of high spectral purity signal at high frequency. Indeed, carrying the microwave signal on an optical carrier offers the opportunity of long staorage time, with almost no dependence on signal frequency. For example, classical OEOs are based on kilometre long fiber delays and, in a relative simple setup, their performances exceed the ones of most microwave oscillators. However, the most promising OEOs architectures, in term of performances and integration level, are based on high Q optical resonators. After an introduction on the principle of OEOs and their various potential applications in advanced microwave systems, we will present recent results that we have obtained in this field.. First, the realization and characterization of silica, CaF2, MgF2 and LiNbO3 Whispering Gallery Modes (WGM) resonators with Q factors in the 10^8-10^9 range will be presented, together with related light coupling techniques for their practical use in OEOs demonstrations. Then the realization and characterization of fiber-ring resonators, that present Q factors exceeding 10^9 in a relatively simple architecture will be highlighted. Finally, dual-frequency laser sources that have been specifically realized for OEOs will be described

Gestion intégrée des zones côtières : risques et responsabilités

La gestion intégrée des zones côtières impose de prendre en considération les espaces marins et terrestres. Ce territoire « entre-deux » est soumis plus que d’autres à un ensemble de risques, que les évolutions climatiques semblent renforcer pour certains. En s’appuyant sur une démarche interdisciplinaire et opérationnelle, il s’agit dans le cadre de ce hors-série de comprendre les enjeux que représentent les risques marins et côtiers, puis de déterminer, d’un point de vue juridique leur portée. Soutien au colloque et au dossier : Université du Littoral Côte d'Opale - Département de Droit, LARJEA 4030, Syndicat mixte Côte d'Opale, Communauté d'agglomération du Boulonnais, Boulogne sur Mer, Conservatoire de l'espace littoral et des rivages lacustres, Agences des aires marines protégées, Mutuelle d'assurance des instituteurs de France et [VertigO] - la revue électronique en sciences de l'environnemen