Lacustrine organic fluxes and paleoclimatic variations during the last 15 ka : lac du Bouchet (Massif Central, France)

To assess the influence of climatic changes on organic lacustrine sedimentation, two cores recovered from the centre of the Lac du Bouchet were studied by petrographical (palynofacies) and geochemical methods. Only core LDB H was used for estimation of the organic fluxes. The variation of these fluxes with climo-stratigraphic periods showed : low organic fluxes during the Lateglacial, an increase at the beginning of the Holocene, a minimum at the end of the Atlantic period resulting from the climatic cooling, and a maximum at the end of the Sub-Boreal related to the installation of the present climatic conditions. (Résumé d'auteur

Internal delensing of cosmic microwave background polarization B-Modes with the POLARBEAR experiment

International audienceUsing only cosmic microwave background polarization data from the polarbear experiment, we measure B-mode polarization delensing on subdegree scales at more than 5σ significance. We achieve a 14% B-mode power variance reduction, the highest to date for internal delensing, and improve this result to 22% by applying for the first time an iterative maximum a posteriori delensing method. Our analysis demonstrates the capability of internal delensing as a means of improving constraints on inflationary models, paving the way for the optimal analysis of next-generation primordial B-mode experiments

Response of littoral chironomid community and organic matter to late glacial lake level and environmental changes at Lago dell'Accesa (Tuscany, Italy).

International audienceThis study focuses on the response of lacustrine littoral chironomid communities to late glacial changes in limnological, environmental and climate conditions in the Mediterranean context. Late glacial chironomid (Diptera: Chironomidae) assemblages, organic petrography and geochemistry were analysed in a sediment core from the littoral zone of Lago dell'Accesa (Tuscany, Italy), where the lake-level fluctuations and the vegetation history have been previously reconstructed. Comparison of the chironomid stratigraphy to other proxies (pollen assemblages, organic petrography and geochemistry, lake-level) and regional climate reconstruction suggested the predominant influence of lake-level changes on the littoral chironomid fauna. The main lowering events that occurred during the Oldest and the Younger Dryas were followed by higher proportions of taxa typical of littoral habitats. A complementary study of organic matter suggested the indirect impact of lake-level on the chironomids through changes in humic status and habitat characteristics, such as the type of substrate and aquatic macrophyte development. Several chironomid taxa, such as Glyptotendipes, Microtendipes and Cricotopus type patens, were identified as possible indicators of low lake-level in the late glacial records. Nevertheless, this study suggested that parallel analyses of organic matter and chironomid assemblages may be needed to circumvent misinterpretation of littoral chironomid assemblage stratigraphy. There was a weak response of the chironomid assemblages to small lake-level lowerings that corresponded to the Older Dryas and Preboreal oscillations. A higher level of determination, e.g. to the species group level, may be necessary to increase the sensibility of the indicators to lake-level changes

Cross-correlation of CMB polarization lensing with High-z submillimeter Herschel-ATLAS galaxies

We report a 4.8σ measurement of the cross-correlation signal between the cosmic microwave background (CMB) lensing convergence reconstructed from measurements of the CMB polarization made by the Polarbear experiment and the infrared-selected galaxies of the Herschel-ATLAS survey. This is the first measurement of its kind

Collaboration entre médecins généralistes et psychologues en libéral

Psychologists and general practitioners (GPs) are the stakeholders most consulted by patients with psychological difficulties. They each have their own professional identity, their own working framework, references, and language. In France, interactions between them seem limited in private practice. The importance of developing collaboration between GPs and psychologists is supported by data from collaborative mental health practices developed in various countries. Such practices have shown significant improvement in health care, and benefits for patients’ health, as well as for GPs’ and psychologists'practices, and for the community. In 2018, the French National Authority for Health published an overview of the situation and recommendations to improve the coordination between GPs and other healthcare actors concerning adult patients with mental health disorders. The review invites healthcare actors to work with better conviction, involvement, and shared culture, as well as to recognize each other's roles and competences. The professionals interviewed in this article, three psychologists and three GPs, outline the current state of collaboration between psychologists and GPs in France and in Belgium, reviewing professional identities, barriers to interactions and organizations. Interprofessional collaboration in mental health involving these actors is formalized and developed in several countries, unlike in France where work and experimentation are rare. The role of each is not well known, and few opportunities are offered for interprofessional practice and education. The authors report on their experience in the field, and on initiatives that have been implemented in a Southern France region. Several actions are reported: joint professional training evenings, “public cross-consultations” and “joint case studies” (with patients’ agreement), working group between faculties leading to a joint Study Day, programming paired cross-consultations in the practice of each, as well as exchanging medical and psychology students. This experience allowed for constructive meetings, exchanges within “professional couples” on common patients, and opportunities to expose medical and psychological views. It also enabled the authors to observe their different professional language and tools used, to break the isolation of mental health care actors, to accelerate the understanding of patients’ situations, and to mutually enrich professional knowledge and practices. This feedback from field experience, which is not representative or generalizable, shows that it is possible to take advantage of interprofessionality in the field. When the actors know each other, working together in the interest of the professionals and of the patients shows better results. Finally, the authors question what desirable directions should be adopted–particularly concerning the institutional frameworks recently implemented in France, and the need for share

New insights into the neolithisation process in southwest Europe according to spatial density analysis from calibrated radiocarbon dates

The agricultural way of life spreads throughout Europe via two main routes: the Danube corridor and the Mediterranean basin. Current archaeological literature describes the arrival to the Western Mediterranean as a rapid process which involves both demic and cultural models, and in this regard, the dispersal movement has been investigated using mathematical models, where the key factors are time and space. In this work, we have created a compilation of all available radiocarbon dates for the whole of Iberia, in order to draw a chronological series of maps to illustrate temporal and spatial patterns in the neolithisation process. The maps were prepared by calculating the calibrated 14C date probability density curves, as a proxy to show the spatial dynamics of the last hunter-gatherers and first farmers. Several scholars have pointed out problems linked with the variability of samples, such as the overrepresentation of some sites, the degree of regional research, the nature of the dated samples and above all the archaeological context, but we are confident that the selected dates, after applying some filters and statistical protocols, constitute a good way to approach settlement spatial patterns in Iberia at the time of the neolithisation process