HAL Clermont Université
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Forêt et changement climatique
No full textNational audienceComment fonctionne une forêt ? Quels liens entre les forêts et le CO2 atmosphérique et par extension avec les climats de la planète ? Quelles conséquences pour la forêt peut-on tirer des projections climatiques ?Quelles solutions et adaptations face à ces conséquences
Removal of arsenic from contaminated soil by washing with amino acid-derived ionic liquids: Remediation effects and potential mechanisms
No full textInternational audienceIt is a challenging task to find an environmentally friendly and effective washing agent for the remediation of contaminated soil. In this study, the remediation effect of 15 amino acid-derived ionic liquids (AA-ILs) on arsenic (As)-contaminated soil was evaluated, and the best washing agent was selected to optimize the washing conditions. The results showed that 1.0 mol/L [Ala] [H2PO4] (Ala represents alanine) exhibited the highest As removal efficiency of 90.1 % at a liquid-soil ratio of 4:1 and a washing time of 480 min. The results of kinetic studies showed that the As removal process by [Ala][H2PO4] washing followed a second-order kinetic model. After washing, residual As was the main form of As in soil, which inhibited the bioavailability and toxicity of As. In addition, the soil type remained unaltered, the content of nutrient elements increased, but the soil pH and mineral content decreased. The potential mechanisms of As removal by [Ala][H2PO4] included acid dissolution, ion exchange and coordination reactions. In conclusion, [Ala][H2PO4] can be used as a green washing agent for efficient remediation of Ascontaminated soil
The effect of ambivalence and perceived vulnerability on in-store behaviours: a cross-sectional study in Tunisia and Colombia
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Challenges in the Definition of the Left Behind in International Migration Studies
No full textInternational audienceThe large differences in income per capita across countries imply that the occurrence of an international migration episode can have far-reaching implications also for the family members left behind, as international migrants typically share a substantial portion of their income gain through remittances sent back home. This chapter reviews the approaches adopted in the literature to define the individuals left behind. This critical and often data-constrained analytical choice can have significant implications for the econometric analysis of the effects of migration and remittances on non-migrant individuals and for comparing results found using different definitions. It discusses the existing wedge between the theoretical representation of migration decisions, which puts the family at center stage, and the empirical analysis, which mainly focuses on a narrower set of family members who co-resided with the migrant. The empirical literature mainly relies on three main approaches, defining the left behind as the members (i) of a remittance-recipient household, (ii) of a household reporting the migration of a former household member, or (iii) as the relatives of the migrant, e.g., spouse, parents or children. The chapter documents the variety of definitions applied in empirical analyses, discussing their implications and limitations. It also reviews some recent advances in the literature, which explore the endogeneity of household composition and family structure with the occurrence of an international migration episode.</div
How to sample Listeria monocytogenes culture for volatolomics by headspace extraction-gas chromatography-Q Exactive Orbitrap mass spectrometry?
No full textInternational audienceVolatolomics - branch of metabolomics focused on volatile organic compounds (VOCs) - provides a wealth of information for characterizing foodborne pathogens and their behaviour. But there is no knowledge relating on how to sample microbial VOCs. The aim of the present study was to determine the most informative sampling mode for further volatolomics. Taking Listeria monocytogenes (L. monocytogenes) as a model pathogen and using case-control experiments based on 24h cultures on liquid synthetic growth medium, bacteria volatolomics was performed by headspace solid phase microextraction - gas chromatography - Q Exactive - Orbitrap TM mass spectrometry on three types of samples: (i) the whole culture, which contains global information diluted by the growth medium, (ii) the pellet collected after centrifugation of the whole culture, which concentrates bacterial cells; and (iii) the related supernatant which includes what the bacteria released into the growth medium. Compound Discoverer TM software was used for automatic peak deconvolution of VOCs. The three sampling modes resulted in different and complementary L. monocytogenes VOCs markers: whole culture and pellet together cover 83% of the markers, while supernatant and supernatant-pellet combination reveal only 59% and 74%, respectively. The robustness of the VOCs markers identified together with the relevance of combining the different sampling modes are discusse
"L'influence du droit européen des défaillances bancaires sur la stabilité financière"
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"Les incidences des virements instantanés en euros à l'égard des banques"
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"Le dirigeant commun en biens et son conjoint"
No full textDossier : Le régime matrimonial du chef d’entreprise, H. Leyrat et A. Meiller (dir.)National audienc
Une nouvelle approche pour la génération efficace des motifs graduels
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