11 research outputs found

    Projet Séripage: « Sélune: Ecologie et gestion des zones rivulaires, ripariennes et des paysages agricoles » [Programme Sélune. Rapport d'étape année 2015]

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    Le projet SĂ©ripage « SĂ©lune : Ecologie et gestion des zones RIvulaires, ripariennes et des Paysages AGricolEs » a dĂ©butĂ© le 26 juin 2014. Le prĂ©sent rapport d'activitĂ© a Ă©tĂ© achevĂ© le 16 dĂ©cembre 2015 et fait Ă©tat des avancĂ©es et perspectives par Volet :- Volet 1 : Suivi des changements dans la vĂ©gĂ©tation aquatique, rivulaire et terrestre Ă  proximitĂ© des cours d’eau- Volet 2 : Suivi des changements dans les interactions entre zone riparienne, paysage et systĂšmes agricoles sur les versants

    Projet Séripage: « Sélune: Ecologie et gestion des zones rivulaires, ripariennes et des paysages agricoles » [Programme Sélune. Rapport d'étape année 2015]

    No full text
    Le projet SĂ©ripage « SĂ©lune : Ecologie et gestion des zones RIvulaires, ripariennes et des Paysages AGricolEs » a dĂ©butĂ© le 26 juin 2014. Le prĂ©sent rapport d'activitĂ© a Ă©tĂ© achevĂ© le 16 dĂ©cembre 2015 et fait Ă©tat des avancĂ©es et perspectives par Volet :- Volet 1 : Suivi des changements dans la vĂ©gĂ©tation aquatique, rivulaire et terrestre Ă  proximitĂ© des cours d’eau- Volet 2 : Suivi des changements dans les interactions entre zone riparienne, paysage et systĂšmes agricoles sur les versants

    Distribution and chronology of Pleistocene permafrost features in France: Database and first results

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    International audienceNumerous periglacial features (polygons, nets, soil stripes, ice-wedge pseudomorphs and sand-wedge casts, involutions) have been recorded in France by examining bibliographical sources and aerial photographs. These data show that a large part of France was affected by permafrost during the Pleistocene and only the southern Aquitaine Basin and Languedoc seem to have been beyond its maximum extent. The first OSL ages obtained from the aeolian infill of wedge structures indicate that at least two phases of thermal contraction cracking occurred in southwestern France between ∌25 and 36 ka. Chronostratigraphical data from loess in northern France indicate that these episodes correspond to the formation of ice-wedge networks associated with tundra gleys. In the latter region, two additional permafrost episodes probably occurred during the Last Glacial, the older one corresponding to the end of Marine Isotope Stage (MIS) 4 around 60 ka and the more recent one to MIS 2 around 19-16 ka. Although stratigraphical data indicate that these episodes were relatively short (about one millennium), relict permafrost may have existed for longer periods in northern France

    Behavioural responses to a photovoltaic subretinal prosthesis implanted in non-human primates

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    International audienceRetinal dystrophies and age-related macular degeneration related to photoreceptor degeneration can cause blindness. In blind patients, although the electrical activation of the residual retinal circuit can provide useful artificial visual perception, the resolutions of current retinal prostheses have been limited either by large electrodes or small numbers of pixels. Here we report the evaluation, in three awake non-human primates, of a previously reported near-infrared-light-sensitive photovoltaic subretinal prosthesis. We show that multipixel stimulation of the prosthesis within radiation safety limits enabled eye tracking in the animals, that they responded to stimulations directed at the implant with repeated saccades and that the implant-induced responses were present two years after device implantation. Our findings pave the way for the clinical evaluation of the prosthesis in patients affected by dry atrophic age-related macular degeneration
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