Search results for "lost"
showing 10 items of 626 documents
Les comportements préalables à la prise lactée chez le souriceau : caractérisation de sécrétions maternelles réactogènes et implication de l'expérien…
2012
Birth is one of the most delicate periods mammalian infants have to deal with. Newborns have then to adapt physiologically and behaviorally to the aerial environment, and one of their first challenges is to ingest colostrum and milk. It is paradoxical that the survival of pups is conditioned by the success of this first suckling, and that we have so little understanding of the stimuli that underlie and promote it. Thus, the present work aims to contribute to answer how immature and naïve newborns do manage to orient to a nipple, to grasp it, and to suckle efficiently? This general issue will be addressed in the mouse in focusing on: i) the nature of the chemical substrates that newborn mice…
Ecology and impact of an emerging invasive species in France: western ragweed (Ambrosia psilostachya DC.)
2015
Western ragweed (Ambrosia psilostachya DC.) is a perennial member of the Asteraceae native to North America that was introduced into France at the end of the 19th Century. Field observations have provided evidence of a recent expansion and of the emergence of dense clonal populations potentially threatening the biodiversity of certain Mediterranean sensitive or degraded habitats. This study therefore aimed to identify the habitats colonized and the ecological conditions favouring successful colonization by this species, and to determine its impact on the plant communities of the semi-natural habitats invaded. Ambrosia psilostachya mostly colonizes ruderal (61 %) and cultivated (14 %) enviro…
Ambroisie trifide, ambroisie à épis lisses : deux poids, deux mesures
2018
National audience; A la demande des Ministères chargés de la santé, de l'environnement et de l'Agriculture, l'ANSES a réalisé des ARP de l'ambroisie trifide (Ambrosia trifida) et l'ambroisie à épis lisses (Ambrosia psilostachya). Résultat : Malgré la proximité botanique de ces espèces, le groupe d'expert a proposé deux conclusions différentes. Si l'ambroisie à épis lisses ne semble pas nécessiter de mesure stricte de gestion il a été recommandé une gestion la plus rigoureuse possible de l'ambroisie trifide. A la suite de ce travail, l'ambroisie trifide pourrait être inscrite sur la liste des espèces européennes nécessitant la mis en place de plan de gestion obligatoire.
Practitioners’ Perceptions of Co-Product Allocation Methods in Biorefinery Development—A Case Study of the Austrian Pulp and Paper Indust…
2022
The utilization of coproducts is a strategy that can be applied to increase the economic and environmental performance of industrial processes and thus reach an objective targeted in several environmental policies. In multi-output production processes, allocation needs to be performed to assess the products’ environmental and economic performance. It is crucial to choose an adequate allocation method, because this choice has been shown to strongly influence overall outcomes. Consequently, rash choices can lead to poor decision-making. Various ways to apply and combine allocation methods can be found in the academic literature, but it is often difficult to find sufficient guidance on how to …
Quelles différences entre enseignement explicite et modèle allostérique ?
2012
International audience
Detoxification of Copper and Chromium via Dark Hydrogen Fermentation of Potato Waste by Clostridium butyricum Strain 92
2022
The accumulation of various types of waste containing both organic and inorganic metal-containing compounds is extremely hazardous for living organisms. The possibility of polymer degradation, biohydrogen synthesis, and metal detoxification via the dark fermentation of model potato waste was investigated. For this purpose, the strict anaerobic strain was isolated and identified as Clostridium butyricum. The high efficiency of dark hydrogen fermentation of potatoes with yield of hydrogen in 85.8 ± 15.3 L kg−1 VSpotato was observed. The copperand chromium salts solutions were added to the culture fluid to obtain the concentrations of 50, 100, and 200 mg L−1 Cu(II) and Cr(VI) in the active pha…
Molecular Basis for Endocrine Disruption by Pesticides Targeting Aromatase and Estrogen Receptor
2020
The intensive use of pesticides has led to their increasing presence in water, soil, and agricultural products. Mounting evidence indicates that some pesticides may be endocrine disrupting chemicals (EDCs), being therefore harmful for the human health and the environment. In this study, three pesticides, glyphosate, thiacloprid, and imidacloprid, were tested for their ability to interfere with estrogen biosynthesis and/or signaling, to evaluate their potential action as EDCs. Among the tested compounds, only glyphosate inhibited aromatase activity (up to 30%) via a non-competitive inhibition or a mixed inhibition mechanism depending on the concentration applied. Then, the ability of the thr…
Estudio del proceso simultáneo de sacarificación y fermentación aceto-butílica-etílica a partir de paja de arroz
2022
El sistema energético de la Unión Europea está experimentando una profunda transformación con la finalidad de mitigar el cambio climático y de asegurar la independencia energética de sus Estados Miembro. Para ello se están llevando a cabo una serie de medidas como la implantación de una cuota mínima en el transporte del 3.5% de biocarburantes producidos a partir de residuos lignocelulósicos, entre otros biocombustibles, para 2030. En este contexto, toma relevancia la producción de biobutanol a partir de residuos lignocelulósicos mediante la fermentación aceto-butílica-etílica (ABE). Sin embargo, su implantación a nivel industrial continúa presentando una serie de desafíos entre los que se p…