139 research outputs found
Effet d'un apport de chaux sur un triticale cultivĂ© sur un vertisol magnĂ©sien : enquĂȘte agrologique effectuĂ©e le 11 septembre 1981 sur la propriĂ©tĂ© Magnin-Pierson Ă Tontouta
Les rĂ©sultats de cette enquĂȘte agrologique effectuĂ©e sur 2 parcelles contigues d'un vertisol magnĂ©sien sous triticale, la premiĂšre amendĂ©e par 1,5 t/ha de CaO sous forme de chaux Ă©teinte, semblent indiquer un effet favorable du chaulage sur ce type de sol et pour cette culture : lamasse des parties aĂ©riennes de triticale Ă©tait de 9% plus Ă©levĂ©e sur la parcelle chaulĂ©e et les immobilisations correspondantes en Ca de 5%. L'enquĂȘte a confirmĂ© par ailleurs la trĂšs forte carence naturelle en phosphore de ce type de sol, le stock sol-plante (P assimilable Olsen de l'arumite -0 Ă 20 cm- plus le P des parties aĂ©riennes) Ă©tant de l'ordre de grandeur des apports de P par les engrais la mĂȘme annĂ©e
Statut minĂ©ral d'un maĂŻs Ă mi-cycle sur vertisol magnĂ©sien : enquĂȘte agrologique effectuĂ©e le 4 septembre 81 sur la propriĂ©tĂ© Magnin-Pierson Ă Tontouta.
Cette Ă©tude prĂ©cise le statut minĂ©ral d'un maĂŻs Ă mi-cycle cultivĂ© sur un vertisol magnĂ©sien de la rĂ©gion de Tontouta. Sont mis en relief notamment : une teneur en Ca des plants de ce champ beaucoup plus faible que celle des plants arrivĂ©s au mĂȘme stade de dĂ©veloppement sur un sol peu Ă©voluĂ© dĂ©rivĂ© d'alluvions rĂ©centes, mais avec un rapport Ca/Mg Ă©quilibrĂ© ; des variations de cette teneur en sens inverse de celles du Mg Ă©changeable du sol ; l'insuffisance des fertilisations apportĂ©es pour une production Ă©levĂ©e. Les deux premiers rĂ©sultats constituent des indices d'une dĂ©ficience calcique sur ce type de sol
Predictors of outcome in infant and toddlers functional or behavioral disorders after a brief parentâinfant psychotherapy
The efficacy of parentâchild psychotherapies is widely recognized today. There are, however, less data on predictive factors for outcome in infants and toddlers and their parents. The aim of this study was to highlight predictive factors for outcome after a brief psychotherapy in a population of 49 infants and toddlers aged 3â30Â months presenting functional or behavioral disorders. Two assessments were performed, the first before treatment and the second a month after the end of the therapy. These assessments included an evaluation of the childâs symptoms, and of depressive or anxiety symptoms in the parents. The assessments after therapy show complete or partial improvement in the childâs symptoms for nearly three quarters, and a decrease in the number of anxious and depressive mothers, and also in the number of depressive fathers. Three independent factors appear as predictive of unfavorable outcome for the child: frequency and intensity of behavioral problems and fears, and the absence of the father at more than two-thirds of consultations. The outcome for the mother is associated solely with her anxiety score at the start of the therapy. This study underlines the particular difficulties involved in the treatment of infants and toddlers presenting behavioral disturbances and emotional difficulties, and the value of involving the father in treatment
Offshore Oligo-Miocene volcanic fields within the Corsica-Liguria Basin: Magmatic diversity and slab evolution in the western Mediterranean Sea
International audienceThe European and Corsica-Sardinia margins of the Ligurian Sea (western Mediterranean) have been affected by a geochemically diverse igneous activity, offshore and onshore, since the Eocene. This magmatism occurred in a global subduction-related framework. On the European side, the oldest Tertiary magmatism dated at ca. 35 Ma was mainly calc-alkaline. It included the emplacement of plutonic bodies of adakitic affinity, such as the quartz microdiorite laccolith locally referred to as "esterellite". Younger magmatic events on-land within the whole Ligurian domain were mostly medium-K or K-rich calc-alkaline. Miocene volcanic activity was important in Sardinia, where andesites and ignimbrites were erupted during several magmatic cycles. In Corsica, it was minor although it emplaced lamprophyres near Sisco at 15 Ma. Dredging and diving cruises conducted in the Ligurian Sea during the last thirty years allowed us to collect a number of submarine samples. We discuss here their geochemistry (major and trace elements) and their whole-rock K-Ar ages and mineral 40Ar-39Ar plateau ages. Around 15 Ma, minor amounts of adakitic lavas were emplaced off southwestern Corsica, in the deepest part of the Liguria-Corsica Basin. They rested over the thinnest southwestern Corsica Hercynian continental crust. Closer to the coast, contemporaneous calc-alkaline rocks erupted on a less thinned crust. The adakitic events could be indicative of either the final stages of active subduction, or alternatively of a slab tearing linked to the southeastern retreat and steepening of the slab. The latter event could be connected with the end of the Corsica-Sardinia block drifting and its correlative eastern collision. Younger volcanic effusions, dated at 14-6 Ma, occurred mostly northwest and north of Corsica. K-rich calc-alkaline basalts, shoshonites and K-rich trachytes were emplaced during this period, and alkali basalts erupted as early as 12 Ma in Sardinia. In the Toulon area, alkali basalts dated at 7-6 Ma represent the last onshore activity just before the Messinian crisis, and the Pliocene alkali basaltic outpouring in Sardinia. We propose to link these latter volcanic events to the development of a slab window in a post-collisional tectonic framework
The size of plume heterogeneities constrained by Marquesas isotopic stripes
International audienceThe scale and geometry of chemical and isotopic heterogeneities in the source of plumes have important scientific implications on the nature, composition and origin of plumes and on the dynamics of mantle mixing over time. Here, we address these issues through the study of Marquesas Islands, one of the Archipelagoes in Polynesia. We present new Sr, Nd, Pb, Hf isotopes as well as trace element data on lavas from several Marquesas Islands and demonstrate that this archipelago consists of two adjacent and distinct rows of islands with significantly different isotopic compositions. For the entire 5.5 Ma construction period, the northern islands, hereafter called the Ua Huka group, has had systematically higher 87Sr/86Sr and lower 206Pb/204Pb ratios than the southern Fatu Hiva group at any given 143Nd/144Nd value. The shape and curvature of mixing arrays preclude the ambient depleted MORB mantle as one of the mixing end-members. We believe therefore that the entire isotopic heterogeneity originates in the plume itself. We suggest that the two Marquesas isotopic stripes originate from partial melting of two adjacent filaments contained in small plumes or "plumelets" that came from a large dome structure located deep in the mantle under Polynesia. Low-degree partial melting under Marquesas and other "weak" Polynesian hot spot chains (Pitcairn-Gambier, Austral-Cook, Society) sample small areas of the dome and preserve source heterogeneities. In contrast, more productive hot spots build up large islands such as Big Island in Hawaii or RĂ©union Island, and the higher degrees of melting blur the isotopic variability of the plume source
Effets de différentes doses de croûte calcaire sur sol sodique acide : résultats expérimentaux obtenus au champ et en serre sur haricot (1982-1983) (Annexe 82-5)
Predictors of outcome in infant and toddlers functional or behavioral disorders after a brief parentâinfant psychotherapy
The efficacy of parentâchild psychotherapies is widely recognized today. There are, however, less data on predictive factors for outcome in infants and toddlers and their parents. The aim of this study was to highlight predictive factors for outcome after a brief psychotherapy in a population of 49 infants and toddlers aged 3â30Â months presenting functional or behavioral disorders. Two assessments were performed, the first before treatment and the second a month after the end of the therapy. These assessments included an evaluation of the childâs symptoms, and of depressive or anxiety symptoms in the parents. The assessments after therapy show complete or partial improvement in the childâs symptoms for nearly three quarters, and a decrease in the number of anxious and depressive mothers, and also in the number of depressive fathers. Three independent factors appear as predictive of unfavorable outcome for the child: frequency and intensity of behavioral problems and fears, and the absence of the father at more than two-thirds of consultations. The outcome for the mother is associated solely with her anxiety score at the start of the therapy. This study underlines the particular difficulties involved in the treatment of infants and toddlers presenting behavioral disturbances and emotional difficulties, and the value of involving the father in treatment
A worldwide survey on incidence, management and prognosis of oesophageal fistula formation following atrial fibrillation catheter ablation: The POTTER-AF study.
AIMS
Oesophageal fistula represents a rare but dreadful complication of atrial fibrillation catheter ablation. Data on its incidence, management and outcome are sparse.
METHODS AND RESULTS
This international multicenter registry investigates the characteristics of oesophageal fistulae after treatment of atrial fibrillation by catheter ablation. A total of 553,729 catheter ablation procedures (radiofrequency: 62.9%, cryoballoon: 36.2%, other modalities: 0.9%) were performed at 214 centers in 35 countries. In 78 centers 138 patients (0.025%, radiofrequency: 0.038%, cryoballoon: 0.0015% (p<0.0001)) were diagnosed with an oesophageal fistula. Periprocedural data were available for 118 patients (85.5%). Following catheter ablation, the median time to symptoms and the median time to diagnosis were 18 (7.75, 25; range: 0-60) days and 21 (15, 29.5; range: 2-63) days, respectively. The median time from symptom onset to oesophageal fistula diagnosis was 3 (1, 9; range: 0-42) days. The most common initial symptom was fever (59.3%). The diagnosis was established by chest computed tomography in 80.2% of patients. Oesophageal surgery was performed in 47.4% and direct endoscopic treatment in 19.8%, and conservative treatment in 32.8% of patients. The overall mortality was 65.8%. Mortality following surgical (51.9%) or endoscopic treatment (56.5%) was significantly lower as compared to conservative management (89.5%) (odds ratio 7.463 (2.414, 23.072) p<0.001).
CONCLUSIONS
Oesophageal fistula after catheter ablation of atrial fibrillation is rare and occurs mostly with the use of radiofrequency energy rather than cryoenergy. Mortality without surgical or endoscopic intervention is exceedingly high
L'Ă©ducation Ă la culture informationnelle
La publication des actes du colloque international L'Ă©ducation Ă la culture informationnelle (Lille, octobre 2008 - sous le patronage de l'Unesco) prĂ©sente les regards de chercheurs, de praticiens ou de reprĂ©sentants d'institutions sur cette notion et ouvre de larges perspectives interdisciplinaires. Le nouveau concept de « culture informationnelle » est proposĂ© par la communautĂ© internationale pour mieux apprĂ©hender la complexification actuelle des relations entre l'enseignement, l'Ă©ducation et l'information, liĂ©e au dĂ©veloppement exponentiel des technologies numĂ©riques. Quel rapport entretient l'Ă©ducation Ă l'information (information literacy) avec l'Ă©ducation aux mĂ©dias (media literacy) et l'Ă©ducation numĂ©rique (digital literacy) ? Le pĂ©rimĂštre de la « culture informationnelle » s'Ă©tend maintenant clairement au-delĂ du monde de la documentation et des bibliothĂšques. La notion mĂȘme doit ĂȘtre prĂ©cisĂ©e, revue, alors que les pratiques continuent d'Ă©voluer. Une place importante est consacrĂ©e dans l'ouvrage Ă l'analyse comparĂ©e des approches thĂ©oriques et de plusieurs expĂ©riences menĂ©es dans diffĂ©rents pays
Genome-wide association analyses identify new Brugada syndrome risk loci and highlight a new mechanism of sodium channel regulation in disease susceptibility.
Brugada syndrome (BrS) is a cardiac arrhythmia disorder associated with sudden death in young adults. With the exception of SCN5A, encoding the cardiac sodium channel Na1.5, susceptibility genes remain largely unknown. Here we performed a genome-wide association meta-analysis comprising 2,820 unrelated cases with BrS and 10,001 controls, and identified 21 association signals at 12 loci (10 new). Single nucleotide polymorphism (SNP)-heritability estimates indicate a strong polygenic influence. Polygenic risk score analyses based on the 21 susceptibility variants demonstrate varying cumulative contribution of common risk alleles among different patient subgroups, as well as genetic associations with cardiac electrical traits and disorders in the general population. The predominance of cardiac transcription factor loci indicates that transcriptional regulation is a key feature of BrS pathogenesis. Furthermore, functional studies conducted on MAPRE2, encoding the microtubule plus-end binding protein EB2, point to microtubule-related trafficking effects on Na1.5 expression as a new underlying molecular mechanism. Taken together, these findings broaden our understanding of the genetic architecture of BrS and provide new insights into its molecular underpinnings
- âŠ