Search results for "MAF"
showing 10 items of 846 documents
Unraveling the exhumation history of high-pressure ophiolites using magnetite (U-Th-Sm)/He thermochronometry
2020
International audience; Magnetite is a ubiquitous oxide in ultramafic and mafic rocks, which is present in a large range of geological and tectonic settings. In the case of high-pressure ultramafic rocks, exhumation timing is commonly constrained by geochronometers in nearby lithologies. The development of the magnetite (U-Th-Sm)/He method (MgHe) has opened new perspectives to refine the exhumation history of such rocks. However no thermal history has been deduced using MgHe data so far. Here we applied MgHe dating to magnetite from an HP-LT alpine ophiolite body (Rocher Blanc) from the Schistes lustres units (Western Alps, France) where part the P-T-t history is constrained to further refi…
Verga e la mafia
2009
Sono passati più di trent’anni dall’interpretazione che Sciascia propose de 'La chiave d’oro'. Sulla scorta delle suggestioni di quella rilettura, mettendo a confronto il testo verghiano con la tacita riscrittura che ne fece Capuana e soprattutto con la traduzione in siciliano di Di Giovanni, le inconsuete tematiche mafiose di quel racconto, già registrate dalla critica, rivelano ulteriori spunti di analisi e offrono indirettamente un’occasione per riflettere sul tema letterario ‘mafia’.
Phosphatidylinositol phosphate kinase type I gamma regulates dynamics of large dense-core vesicle fusion.
2005
Phosphatidylinositol-4,5-bisphosphate was proposed to be an important regulator of large dense-core vesicle exocytosis from neuroendocrine tissues. Here, we have examined the kinetics of secretion in chromaffin cells from mice lacking phosphatidylinositol phosphate kinase type Iγ, the major neuronal phosphatidylinositol-4-phosphate 5-kinase. Absence of this enzyme caused a reduction of the readily releasable vesicle pool and its refilling rate, with a small increase in morphologically docked vesicles, indicating a defect in vesicle priming. Furthermore, amperometry revealed a delay in fusion pore expansion. These results provide direct genetic evidence for a key role of phosphatidylinositol…
El comercio de seres humanos
2001
La chirigota política
2006
Intervista alle vittime del racket in Sicilia, Campania e Calabria. Un'indagine empirica
2017
In questo capitolo si presenta una sintesi dei risultati ottenuti dall'indagine svolta dall'unità di ricerca "La condizione delle vittime della criminalità organizzata nel meridione: approfondimenti e confronti tra mafia, camorra e 'ndrangheta nell'ambito di un progetto PRIN (Progetti di rilevante interesse nazionale), cofinanziato dall'Università degli studi di Palermo e dal MIUR.
Geochemistry of Chromian Spinels from the Indo-Myanmar Ophiolite Belt of Northeastern India
2015
Chromite is commonly used for deciphering the petrogenesis and geodynamic setting of ultramafic rocks. Chromespinels from the Indo-Myanmar ophiolite belt occurring in the form of podiform chromitites associated with the mantle sequence and associated volcanic rocks are studied to characterise their geochemical composition. We have measured major and trace element concentrations of the chrome-spinels. Cr/(Cr+Al) (Cr#) and Mg/(Mg+Fe 2+ ) (Mg#) range from 66 to 70 and 66 to 69 respectively in the chromitite and 47 to 56 and 67 to 70 in volcanic spinel. The computed crystallization conditions show that the studied samples crystallized in an upper mantle environment. Using the chrome spinel comp…
New evidence of mantle heterogeneity beneath the Hyblean Plateau (southeast Sicily, Italy) as inferred from noble gases and geochemistry of ultramafi…
2012
Abstract We analyzed major and trace elements, Sr and Nd isotopes in ultramafic xenoliths in Miocenic age Hyblean diatremes, along with noble gases of CO2-rich fluid inclusions hosted in the same products. The xenoliths consist of peridotites and pyroxenites, which are considered to be derived from the upper mantle. Although the mineral assemblage of peridotites and their whole-rock abundance of major elements (e.g., Al2O3 = 0.8–1.5 wt.%, TiO2 = 0.03–0.08 wt.%) suggest a residual character of the mantle, a moderate enrichment in some incompatible elements (e.g., LaN/YbN = 9–14) highlights the presence of cryptic metasomatic events. In this context a deep silicate liquid is considered the me…
COLLETTI BIANCHI, ZONA GRIGIA E MAFIE
2013
COLLETTI BIANCHI, ZONA GRIGIA E MAFIE
Prospects for advanced electron cyclotron resonance and electron beam ion source charge breeding methods for EURISOL
2011
International audience; As the most ambitious concept of isotope separation on line (ISOL) facility, EURISOL aims at producing unprecedented intensities of post-accelerated radioactive isotopes. Charge breeding, which transforms the charge state of radioactive beams from 1+ to an n+ charge state prior to postacceleration, is a key technology which has to overcome the following challenges: high charge states for high energies, efficiency, rapidity and purity. On the roadmap to EURISOL, a dedicated R&D is being undertaken to push forward the frontiers of the present state-of-the-art techniques which use either electron cyclotron resonance or electron beam ion sources. We describe here the gui…