2,644 research outputs found
Organic Farming and Market in the EU
Information on organic farming and market in the European Unio
La diversité des usages et des étudiants au sein de la MédiathÚque Jean Lévy à Lille
Les » Ă©tudiants, « les » jeunes⊠Une Ă©tude des usages des Ă©tudiants lillois â prĂ©sentĂ©e au CongrĂšs de Reims â montre quâils composent un public plus hĂ©tĂ©rogĂšne quâil nây paraĂźt et quâune approche prenant en compte la discipline Ă©tudiĂ©e laisse entrevoir des comportements diffĂ©renciĂ©s
Early- and late-migrating cranial neural crest cell populations have equivalent developmental potential in vivo
We present the first in vivo study of the long-term fate and potential of early-migrating and late-migrating mesencephalic neural crest cell populations, by performing isochronic and heterochronic quail-to-chick grafts. Both early- and late-migrating populations form melanocytes, neurons, glia, cartilage and bone in isochronic, isotopic chimeras, showing that neither population is lineage-restricted. The early-migrating population distributes both dorsally and ventrally during normal development, while the late-migrating population is confined dorsally and forms much less cartilage and bone. When the late-migrating population is substituted heterochronically for the early-migrating population, it contributes extensively to ventral derivatives such as jaw cartilage and bone. Conversely, when the early-migrating population is substituted heterochronically for the late-migrating population, it no longer contributes to the jaw skeleton and only forms dorsal derivatives. When the late-migrating population is grafted into a late-stage host whose neural crest had previously been ablated, it migrates ventrally into the jaws. Thus, the dorsal fate restriction of the late-migrating mesencephalic neural crest cell population in normal development is due to the presence of earlier-migrating neural crest cells, rather than to any change in the environment or to any intrinsic difference in migratory ability or potential between early- and late-migrating cell populations. These results highlight the plasticity of the neural crest and show that its fate is determined primarily by the environment
Philippe Cottier & François Burban (dir.), Le lycée en régime numérique. Usages et compositions des acteurs
Cet ouvrage traite de lâĂ©volution des lycĂ©es Ă lâĂšre numĂ©rique en prenant comme objets dâĂ©tude la pluralitĂ© des acteurs qui composent la scĂšne lycĂ©enne : Ă©lĂšves, enseignants, conseillers principaux dâĂ©ducation, chefs dâĂ©tablissement. Il se propose dâĂ©tudier leurs usages des outils informationnels et communicationnels, ainsi que des plateformes telles que les environnements de travail numĂ©rique (ENT) dĂ©ployĂ©s dans les lycĂ©es, lesquels nâĂ©chappent pas Ă ce mouvement gĂ©nĂ©ralisĂ© de lâintĂ©gration ..
GĂ©rer la vie quotidienne, occuper des postes dâencadrement : les usages « non-professionnels » des TIC par les femmes et leur conjoint sur le lieu de travail
Lâarticle questionne lâutilisation des TIC (Technologie de lâinformation et de la communication) depuis le lieu de travail dans lâarrangement des sexes et dans lâarticulation entre la vie familiale et la vie professionnelle, Ă ce moment spĂ©cifique oĂč lâarrivĂ©e dâun enfant bouleverse les Ă©quilibres de la cellule familiale. Bien que lâenquĂȘte ait Ă©tĂ© rĂ©alisĂ©e essentiellement auprĂšs de cadres du secteur privĂ© et des entreprises publiques, comprendre ces pratiques est dâautant plus intĂ©ressant que se gĂ©nĂ©ralisent des dispositifs de cyber-surveillance dans les organisations et quâune exigence managĂ©riale fait progressivement prĂ©valoir une culture de rĂ©sultat et de lâefficacitĂ© au sein des administrations du secteur public (Caillosse, 2003). Des mesures sont prises par les employeurs pour faciliter la « conciliation travail-famille » (LefĂšvre et al., 2009). Pour alimenter la rĂ©flexion sur leurs dispositions Ă lâĂ©gard des work-family arrangements, lâarticle aborde plus spĂ©cifiquement un objet controversĂ© et jugĂ© « illĂ©gitime » : les usages personnels des TIC depuis le lieu de travail. Courriers et agenda Ă©lectroniques, messagerie instantanĂ©e ou tĂ©lĂ©phone mobile, etc. favorisent lâinti- mitĂ© au travail. Ils permettent dây importer les prĂ©occupations familiales et de gĂ©rer la famille Ă distance. Inversement, par leur intermĂ©diaire, le travail Ă©tend son emprise Ă domicile. TantĂŽt ces outils accentuent la spĂ©cialisation du travail domestique et parental des femmes tantĂŽt ils favorisent la rĂ©partition des tĂąches entre conjoints. Tout dĂ©pend des modes de rĂ©gulation propres Ă chaque couple biactif et de ceux de lâemployeur Ă lâĂ©gard des « affaires privĂ©es » au travail.Personal use of ICT by Women and their husband at the office. Email, PDA, instant messaging and other digital tools are useful to create privacy at work and to manage housework and educational tasks despite the distance. This paper explores how couples having at least one child under three years old, combine their work and family lives today using internet and mobile phone at the workplace. For executive women, these technologies also allow home office and flexible work schedules. If employers take measures to facilitate work-family arrangements, they are distrustful of personal activities at the workplace. Beyond the interactions between work and family lifes, these are the ârules of relevanceâ of the couple that promote equality in the workplace
L'agriculture bio dans l'Union européenne
Panorama de l'agriculture biologique dans l'Union européenn
The Neural Crest Migrating into the Twenty-First Century
From the initial discovery of the neural crest over 150 years ago to the seminal studies of Le Douarin and colleagues in the latter part of the twentieth century, understanding of the neural crest has moved from the descriptive to the experimental. Now, in the twenty-first century, neural crest research has migrated into the genomic age. Here, we reflect upon the major advances in neural crest biology and the open questions that will continue to make research on this incredible vertebrate cell type an important subject in developmental biology for the century to come
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