Search results for "MC"
showing 10 items of 2122 documents
Quelques questions concernant la contribution de MO fossile dans le cycle supergène
2003
Bien qu'observée depuis plus d'un siècle dans les cours d'eau, les sédiments et plus récemment dans les sols (un exemple parmi d'autres : [1]), la contribution potentielle de carbone organique (Corg) que nous qualifierons de géologique et libéré par l'altération des formations géologiques n'a que rarement été, excepté [2], prise en compte dans les bilans globaux concernant le cycle supergène (références dans [3]). Pourtant les formations géologiques classiquement reconnues comme contenant du Corg. représentent plus de 50% des surfaces continentales. Une estimation de ce que nous pouvons appeler une production organique liée à l'érosion chimique des roches carbonatées (carbonates, shales) a …
Dynamique sédimentaire des dépôts post-rift du bassin intérieur du Gabon.
2006
14 pages; International audience
Synthèse préliminaire des travaux menés sur le bassin de Benguela (Sud Angola) : implications sédimentologiques, paléontologiques et structurales.
2006
12 pages; International audience; Les travaux menés dans le bassin de Benguela ont apporté une moisson de nouvelles données de terrain quant à la période apto-albienne de ce secteur ouest africain. Outre les résultats majeurs obtenus en ce qui concerne les faunes d'ammonites jusqu'alors peu étudiées dans ce bassin, et qui ont permis des corrélations indispensables pour la compréhension du fonctionnement de la sédimentation, cette étude a permis de mettre en évidence une compartimentation remarquable de la sédimentation et des structures de tectonique salifère. Des tels résultats ont une portée à la fois fondamentale et appliquée. En effet, il paraît que le bassin de Benguela soit un des rar…
The role of slabs and oceanic plate geometry in the net rotation of the lithosphere, trench motions, and slab return flow
2012
International audience; [1] Absolute plate motion models with respect to a deep mantle reference frame (e.g., hot spots) typically contain some net rotation (NR) of the lithosphere. Global mantle flow models for the present-day plate setting reproduce similarly oriented NRs but with amplitudes significantly smaller than those found in some high NR Pacific hot spot reference frames. It is therefore important to understand the mechanisms of NR excitation, which we attempt here with two-dimensional cylindrical models of an idealized Pacific domain. We study the influence of slab properties, oceanic ridge position, continental keels, and a weak asthenospheric layer on NR and trench migration. F…
Dual role of acyl-coa binding protein in the hypothalamus: regulator of astrocyte fatty acid metabolism and gliotransmitter targeting pomc neurons
2013
La liste des auteurs est incomplète.; absent
Some Plant Defense Stimulators can induce IL-1β production in human immune cells in vitro
2020
8 pages; International audience; Among Plant Protection Products (PPP), a new emerging category of pesticides act by stimulating plant defense in order to improve plant resistance against microbial pathogens. Given that these compounds, the so-called Plant Defense Stimulators (PDS) act on innate immunity, we tested, using an in vitro approach on human mononuclear leucocytes (PBMC), the potential toxicity (XTT assay) and inflammatory effects (production of IL-1β) of 4 PPP belonging to different chemical families. We found that two products (LBG-01F34® and Regalis®) did not induce any cytotoxicity or IL-1 β production. The product BION-50 WG®, that contains Acibenzolar-S-methyl (ASM) and sili…
Design and evaluation of a creation of the demand model in order to increase voluntary medical male circumcision among adults in a South African comm…
2017
Three randomized controlled trials showed the protective role of circumcision in heterosexual HIV transmission. The World Health Organization (WHO) and the Joint United Nations Program on AIDS (UNAIDS) recommend that voluntary male medical circumcision (VMMC) programs should be rolled-out wherever there is a generalized HIV epidemic and few men are circumcised. WHO recommends a prevalence rate of at least 80% male circumcision in adults to have a substantial impact on the HIV/AIDS epidemic in Eastern and Southern Africa. Starting in 2007 in the fourteen Southern and Eastern Africa countries identified as priority countries, the programs to promote the CVME have allowed a rapid increase of t…
Isolated lung perfusion with chemotherapy in a pig model
2014
Introduction: The isolated lung perfusion (ILP) is an experimental technique which main objective is to deliver high dose of cytotoxic agent to the lung tissue without systemic exposure. The thesis took place in three stages: first stage, setting in vitro the chemotherapy the most efficient against colorectal cancer (CCR) cells in 30 min. Second stage, develop the ILP technique in a pig model. Third stage, lead a dose escalation study with chemotherapy by ILP.Methods: First stage, efficacy of various cytotoxic molecules against a panel of human CCR cell lines was tested in vitro after a 30-minute exposure. Second stage, pigs were treated with chemotherapy delivered by ILP during 30 minutes …
Impacts of Integrated Weed management in cropping systems on N2O emissions from soils
2014
International audience
Astrocytes and hypothalamic glucose sensing: metabolic role and involvement of astroglial connexins
2012
The hypothalamus plays a pivotal role in the nervous control of glucose homeostasis. This area contains gluco-sensitive neurons. Some of them detect increases in glucose levels and regulate glucose homeostasis by stimulating insulin secretion or inhibiting food intake. It is widely accepted that astrocytes are metabolically coupled to neurons. Lactate, resulting from the metabolism of glucose by astrocytes, is transported via the monocarboxylate transporters (MCTs). In addition, gap junctions (GJ), that form networks within astrocytes, are essential to transfer glucose from the bloodstream to the active neurons. These astroglial GJ mainly consist of connexins 43 and 30 (Cxs).The aims of my …