2,656 research outputs found
Il Rinascimento fiorentino
No full textIl saggio mette a fuoco le relazioni tra la storiografia italiane a e straniera sul problema del Rinascimento a Firenze.[...
La campagna etiopica del caporale Fantoni
No full textAnalisi del memoriale e del diario fotografico del caporale Fantoni riguardo alla sua partecipazione alla conquista dell'Etiopi
[ST-elevation myocardial infarction: reperfusion strategy based on the results from large clinical trials].
No full textThe efficacy of reperfusion therapy, both pharmacological and mechanical, in patients with ST-elevation myocardial infarction (STEMI) is time-dependent. The relation is closer the earlier we are from symptom onset and is valid for thrombolysis within 6h and for primary angioplasty till to at least the twelfth hour. Benefits of reperfusion bring to an advantage both in terms of myocardial salvage and left ventricular systolic function and in terms of quality of life and long-term survival. Although mortality and morbidity of STEMI patients have been greatly reduced in the last 20 years, the need for guideline revision and implementation remains urgent, mostly because mortality of real-world STEMI patients keeps to be always much higher compared to what reported in big randomized controlled trials. The most important indications from big trials and guidelines regarding both pharmacological and non-pharmacological reperfusion strategy in STEMI patients are discussed
The neural basis of 3D rotation sensitivity from self-generated Optic Flow: a Transcranial Magnetic Stimulation Study
No full textA stationary surface slanted around the vertical axis and observed during a head translation appears to be stationary during monocular, but not binocular viewing when the same image is projected to the two eyes (null disparity). This effect is likely caused by the perceptual interpretation of the optic flow affected by the null disparity information, rather than by extra-retinal signals coming from vergence and accommodation, which instead should lead to an unbiased perception (Fantoni, Domini & Caudek 2010). Here, we investigated the neural basis of this phenomenon with a rotation-detection task during active binocular and monocular viewing before and after offline inhibitory rTMS over early visual areas V2/V3 and the Middle Temporal area (hMT). At baseline subjects reported a rotating object significantly more often in the binocular relative to the monocular viewing condition. Stimulation overV2/V3 caused a reduction of the response bias and a general improvement of the sensitivity in the binocular viewing condition only. These findings were consistent with: I) a disruption of disparity information conflicting with motion and II) a residual effect of binocular summation occurring earlier in the visual hierarchy. Interestingly, stimulation of hMT led to a selective impairment of performance in the monocular viewing condition. Contrary to V2/V3 stimulation, binocular viewing condition was not affected by hMT stimulation. This might indicate that any potential performance gain due to the inhibition of hMT disparity neurons was constrained by the performance impairment due to the inhibition of hMT motion-sensitive neurons. Overall, the results suggest that: (1) the perception of 3D surfaces during active vision is likely mediated by the activity of cortical areas involved in the processing of retinal but not extra-retinal signals; (2) both hMT and V2/V3 are critically involved in the encoding and integration of motion and disparity signals generated during active vision
TUFFACEOUS DEPOSITS IN THE SEDIMENTARY COVER OF THE STRONA-CENERI ZONE AND IN THE VILLAFORTUNA-TRECATE OIL SYSTEM: PETROLOGICAL, GEOCHEMICAL AND GEOCHRONOLOGICAL CHARACTERIZATION
No full textIn the western sector of the Southern Alps, tuffaceous levels are occasionally found in Triassic sedimentary sequences and the age of the related magmatism is still matter of debate. The few available geochronological data on these tuffites (M. San Giorgio area, Lugano, CH) yield Triassic ages (245±1 Ma; U-Pb zircon [1]), which are slightly older than the stratigraphic position. The precise definition of the tuffite age is, however, important for the Triassic evolution of the western Alps. In particular, if the magmatism is synchronous with their stratigraphic position, tuffites might be linked to the Triassic magmatism documented by the Finero area (NE Ivrea-Verbano Zone [2]). However, it cannot be presently excluded that they are the product of erosion and re-deposition of the Permian acid volcanics located at the base of the Mesozoic sedimentary cover [3].In this work, we have considered the tuffaceous deposits occurring within a late Anisian-Ladinian succession in the Mesozoic sedimentary cover of the Strona-Ceneri Zone in the Borgosesia area [3,4] and the tuffites at the same stratigraphic position found in some wells of the Villafortuna-Trecate oil system field (western Po Plain, Piedmont region, NW Italy) [5]. These tuffaceous deposits are constituted by a variable mixture of magmatic and sedimentary components. Available chamical data on the magmatic component suggests a calc-alkaline affinity. Zircons have been separated with conventional methods from four samples, mounted in epoxy resin and characterised under cathodoluminescence (CL). Based on colour, morphology and internal structure, zircons have been divided in two populations. One group is constituted by light-pink coloured zircons with prismatic habits and tight osciscillatory zoning suggesting growth under magmatic conditions. Zircons from the second group are colourless, rounded in shape and with only relics of magmatic zoning. They most likely suffered metamorphic recrystallization.Ongoing ELA-ICP-MS characterizations of both trace elements composition and U-Pb age of these zircons is expected to provide valuable constraints on the geodynamic evolution of the Southern Alps Domain in Permo-Triassic times.References. [1] Mundil, R., Brack, P., Meier, M., Rieber, H., Oberli, F. (1996): Earth and Planetary Science Letters, 141, 137-151; [2] Peressini, G., Mazzucchelli, M., Rivalenti, G., Hofmann, A.W. (2004): Geophysical Research Abstracts, 6, 05072, SRef-ID: 1607-7962/gra/EGU04-A-05072; [3] Carraro, F., Fiora, L. (1974): Riv. It. Paleont. Strat., 80, 167-191; [4] Fantoni, R., Decarlis, A., Fantoni, E. (2004): Atti Tic. Sc. Terra, 44, 97-110; [5] Fantoni, R., Bello, M., Ronchi, P., Scotti, P. (2002): Extended Abstracts Book EAGE Conference Florence
Rulemaking and its constitutional consequences: EU and USA compared
No full textChapter from The American Exceptionalism Revisited; edited by Marcello Fantoni and Leonardo Morlino. (Kent State University European Studies, 2) Roma: La Viella, 2015. ISBN: 9788867283286One recurring theme in this Volume is the role of systematic comparison of political structures and institutions. With the entry into force of the so-called Lisbon Treaty, most of the attention is rightly focused on the constitutional, and, perhaps, federalizing elements of the European Union (EU), in comparison to the type of constitutional politics and federalist
structures that have molded political development in America
Critical temperature of non-interacting Bose gases on disordered lattices
No full textFor a non-interacting Bose gas on a lattice we compute the shift of the critical temperature for condensation when random-bond and on-site disorder are present. We evidence that the shift depends on the space dimensionality D and the filling fraction f. For D ->∞ (infinite range model), using results from the theory of random matrices, we show that the shift of the critical temperature is negative, depends on f, and vanishes only for large f. The connections with analogous results obtained for the spherical model are discussed. For D = 3 we find that, for large f, the critical temperature Tc is enhanced by disorder and that the relative shift does not appreciably depend on f; in contrast, for small f, Tc decreases, in agreement with the results obtained for a Bose gas in the continuum. We also provide numerical estimates for the shift of the critical temperature due to disorder induced in a non-interacting Bose gas by a bichromatic incommensurate potential
Can IVUS-virtual histology improve outcomes of percutaneous carotid treatment?
No full textSeveral previous studies focusing on comparison between outcomes of carotid artery stenting (CAS) and carotid endoarterectomy (CEA) have put forward conflicting results about the non-inferiority of CAS compared to CEA. Likely outcomes after CAS have been greatly limited by incomplete knowledge of atherosclerotic carotid pathology and probably inappropriate patient selection criteria. In the current practice, only the degree of lumen obstruction is indication to an invasive treatment (CEA or CAS) in symptomatic or asymptomatic patients, but it has been recently demonstrated that histology of carotid plaques also plays a major role. Indeed, plaque morphology and composition seem to influence more importantly outcomes of CAS than those of CEA. Angiography is a poor diagnostic tool to detect the severity and composition of atherosclerotic lesions. Virtual histology (VH) is a new technology incorporated in the latest intravascular ultrasound (IVUS) equipment that allows a validated histological characterization of plaques by performing a spectral, objective and highly-reproducible analysis of the radiofrequency and amplitude data of the ultrasound waves that cross different tissues. This manuscript reports authors' experience with the use of IVUS-VH during CAS. This new technology, by characterizing morphology, extension and histology of carotid plaque, seems to provide important information for confirming percentage of carotid stenosis and judging its embolic potential, tailoring the procedure and guiding the choice of stent and finally for checking stent apposition and complete covering of vulnerable plaques. According to authors' opinion IVUS-VH has the potential to optimize patients' and lesions' selection criteria for CAS in order to improve its outcomes
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