Traumatisme crânien chez l'enfant de moins de 6 ans - élaboration et évaluation de la compréhension d'un message de santé au sein du réseau Courlygones (enquête auprès de 300 parents à partir de cas simulés)

LYON1-BU Santé (693882101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Existence of a solid solution from brucite to b-Co(OH)2

International audienceThis study shows that between brucite (Mg(OH)2) and β-Co(OH)2, all the compositions are possible. The solid solution Mg1−xCox(OH)2 has been synthesized by an easy and fast coprecipitation route and characterized by XRD and TEM. Single phase powders have been obtained. The particles exhibit platelets morphology with a size close to one hundred nanometers. XRD analysis shows an evolution of the cell parameters when x increases and demonstrates that no ordering of the cations occurs. However, extra reflections on TEM electron diffraction patterns seem to indicate that local ordering can exist. The compounds issued from this solid solution could be good candidates as precursors in order to obtain Mg-Co mixed oxide with all possible cationic ratio

Effect of time on the reconstruction of the Mg4Al2(OH)12CO3·3H2O layered double hydroxide in a Na2CO3 solution

International audienceThe effect of time on the reconstruction of an Mg4Al2(OH)12CO3·3H2O LDH compound in a 0.1 M Na2CO3 solution have been investigated. It seems that the reconstruction phenomena of the Mg4Al2(OH)12CO3·3H2O LDH after a moderate thermal treatment is a very fast process, as it is already completed after 5 min of soaking in a 0.1 M Na2CO3 solution. Indeed, the weight of the reconstructed samples after the centrifuging-washing-drying cycle, as well as the carbon content of the reconstructed samples, remains constant whatever the time of contact between the solution and the mixed oxides issued from LDH. Powder XRD patterns are also similar for all the reconstructed samples without significant FWHM variations. SEM and TEM observations coupled with granulometric and BET measurements show that all the samples, both mixed oxides and reconstructed LDHs, are composed by aggregates of small plate-like particles (less than 100 nm) with a sub-hexagonal morphology but with different porosities

Synthesis and anion exchange properties of a Zn/Co double hydroxide salt

International audienceIn this study, a ZnCo―SO4 double hydroxide salt (DHS) has been synthesized by the reaction of CoSO4*7H2O with solid ZnO in aqueous solution. The resulting pink ZnCo―SO4 DHS was characterized by X-ray Diffraction, Infrared Spectrometry, UV/Visible Spectrometry and Thermal analysis. Characterizations show that its structure is similar to the one described for the layered Zn Sulfate Hydroxide Hydrate, i.e. brucite layers with 1/4 empty octahedra presenting tetrahedrally coordinated divalent atoms above and below the empty octahedra. Co atoms are located in the octahedra and zinc atoms in tetrahedra and octahedra. In this structure the exchangeable anions are located at the apex of tetrahedra. SEM and TEM observations show that the DHS is composed by aggregates of hexagonal plates of several hundreds of nanometers. Due to its interest for industrial or environmental applications, the exchange of sulfate groups by carbonates has been investigated. Results show a limited exchange capacity and a higher affinity for sulfates compared to affinity for carbonates

Evidence of the influence of the cationic composition on the anionic affinity of layered double hydroxides

International audienceThe effect of the cationic composition on the anionic affinity is evaluated by studying the reconstruction of the layered double hydroxide structure from mixed oxides obtained by the heat treatment of the Mg4Al2-layered double hydroxides solid solution, in aqueous solutions containing carbonates, sulfates, and nitrates. After synthesis, all the samples present the same c parameter whatever the iron content. After a thermal treatment at moderate temperature, amorphous mixed oxides are obtained from all the samples. The influence of the cationic composition is clearly demonstrated on the anionic affinity as the Mg4Al2-amorphous mixed oxides reconstructs the layered double hydroxide structure with 90 % carbonates and 10 % sulfates whereas the Mg4Fe2-amorphous mixed oxides reconstruct the layered double hydroxide structure with 89 % carbonates, 7 % sulfates, and 4 % nitrates. The nitrate ratio increases as the iron content increases

Penser et représenter le corps dans l'Antiquité

Dans un article fondateur paru en 1934, Marcel Mauss invitait anthropologues, sociologues et historiens à étendre leurs investigations aux techniques corporelles, désignant par cette expression les façons dont les hommes se servent de leur corps dans une société donnée. Cet art d'utiliser son corps varie d'une société à une autre, d'une époque à une autre : c'est pourquoi penser le corps ou le représenter ne se réduisent pas à une somme de connaissances scientifiques, mais relèvent bien d'une histoire, avec ses rythmes propres, ses ruptures et ses évolutions spécifiques. Depuis près de quarante ans, la recherche scientifique s'est évertuée à mettre en évidence cette histoire principalement à partir de l'avènement du christianisme, plus exactement à partir de l'émergence de nouvelles subjectivités, dans le but d'élucider les relations complexes que notre modernité décèle derrière les usages des plaisirs ou le souci de soi. Mais avant cette modernité, comment pensait-on le corps ? Quels étaient les systèmes de représentations mentales qui structuraient l'appréhension corporelle dans ses tâches et ses emplois quotidiens ou exceptionnels ? Si l'éducation ou la tradition impriment des marques culturelles indélébiles sur le corps de tous et chacun, comment les corps ont-ils fonctionné dans les sociétés de l'Antiquité ? Le colloque international tenu sur ce thème à l'université Rennes 2, dans le cadre de la Celtic Conference in Classics, se proposait d'apporter quelques réponses à ces questions et de livrer, par des études de cas, quelques clefs de compréhension. Les sociétés des cités grecques ou de l'Empire romain ont édicté des conduites, sanctionné des écarts, selon leurs normes propres, souvent bien éloignées des nôtres, parfois si proches aussi. Et, loin de réduire le corps à n'être qu'un instrument de savoir-vivre ou un carcan étroitement surveillé, les Anciens ont surtout développé une pensée pour que le corps sache vivre et mieux vivre dans le monde