197,483 research outputs found
Indagine conoscitiva sull’uso e integrazione delle ICT nei servizi
No full textLa ricerca sulle credenze di insegnanti ed educatori, intendendo un sistema, più o meno strutturato, di regole, opinioni, valori e aspettative, ha dimostrato come queste influenzino, talvolta in termini predittivi, l’integrazione delle tecnologie nell’azione didattica e come esse siano in stretto rapporto con la capacità d’uso delle tecnologi
The NW sector of the Sicily Channel: geometry and evolution of inverted structural lineaments
No full textThe 3-D trend of anticline axial planes, fault planes and surfaces has been reconstructed in the offshore area between
the Egadi Islands and the Sciacca High from the interpretation of multichannel seismic reflection profiles and well data
(available from the VIDEPI project database). In particular, isopach maps generated for the five seismic units of age
between Cretaceous and Quaternary allowed highlighting the space-time migration of the tectonic processes. The
western portion of the studied area covers the submerged prolongation of the inner sector of the Sicilian-Maghrebian
chain, limited in the NW and in the SE by two tectonic lineaments running along the western and eastern margins of the
Adventure Bank: the Maghrebian Thrust Front and Adventure Thrust Front, respectively (see Argnani et al., 1986). The
eastern portion is characterized by transpressive zones orientated NNE-SSW identifying the Separation Belt that partly
corresponds to the foreland area which contains the Gela Nappe Thrust.
Age constraints indicate that contraction related to the Sicilian-Maghrebian fold and thrust belt migrated
progressively towards the southeast. The emplacement of the western front is attributable to the Middle-Upper Miocene
while that of the eastern front is Plio-Pleistocene. Within this tectonic framework, two tectonic basins were identified on
the basis of the different trend, age and evolution. The Adventure foredeep exhibits the maximum thickness of 500 m in
correspondence of the Adventure Plateau. Here, the younger Gela foredeep displays minor depth showing a thickness
increase towards the Gela Nappe and the Pantelleria graben.
Positive inversion structures form by the Plio-Pleistocene compressional reactivation of preexisting structures
limiting the Saccense and Trapanese domains were recognized the offshore sector between Mazara and Sciacca.
Moreover, a correlation between the Campobello di Mazara-Castelvetrano alignment as proposed by Barreca et al.,
2013, Ferranti et al., this meeting, and the tectonic units recognized in their offshore prolongation has been recognized.
Therefore, we propose that in this area contractional tectonics is still active (see also Pepe et al., this meeting), and
occurs on high-angle, NW-dipping crustal ramps (Monaco et al., 1996)
Morfologia e morfometria del settore ionico del Golfo di Taranto.
No full textIl versante Ionico del Golfo di Taranto è caratterizzato dalla presenza di alti strutturali e bacini che
rappresentano l’espressione morfologica di sistemi di faglie pleistoceniche transpressive. La dorsale di
Amendolara si estende per 45 Km in direzione N130°E, ed è caratterizzato dalla presenza di tre alti
batimetrici minori (denominati Amendolara, Rossano e Cariati). Verso NE, la dorsale di Capo Spulico si
estende per 40 Km in direzione !N115°E.
Durante la Campagna Oceanografica “Teatioca” sono stati acquisiti 1100Km2 di dati batimetrici
multibeam e profili sismici monocanale ad alta (Sparker) ed altissima risoluzione (Subbottom Chirp).
L’analisi integrata dei nuovi dati ha consentito di ottenere una sintesi morfostrutturale preliminare dell’area
sud-orientale del Golfo di Taranto [Santoro et al., 2012].
L’insieme dei dati morfometrici evidenzia un ruolo chiave nell’attività traspressiva della faglia che borda
a SW la dorsale di Amendolara, in quanto la regolarità dei pendii rivolti a S è legata alla deformazione e
sollevamento dei versanti, che tende a superare l’effetto dei processi erosivi (versanti a controllo morfostrutturale).
Il processo di basculamento guidato dall’azione della faglia sembra essere all’originedei processi
responsabili dell’erosione gravitazionale canalizzata sui pendii esposti a nord (versanti a controllo morfosedimentario).
Sette ordini di terrazzi sono stati riconosciuti sul top del Banco di Amendolara, attraverso tecniche di
analisi dei picchi nel diagramma di distribuzione delle quote [Passaro et al., 2011]. Tale dato e le statistiche
sui profili estratti dal DTM testimoniano la presenza di tassi differenziali di sollevamento ed un complessivo
tilt (verso E) del settore frontale ionico dell’Appennino Meridionale, in accordo con quanto suggerito in
letteratura [Ferranti et al., 2009].
Bibliografia
Ferranti, L., Santoro, E., Mazzella, M.E., Monaco, C., Morelli, D., (2009). Active transpression in the
northern Calabria Apennines, southern Italy. Tectonophysics, 476 (1-2), 226-251.
Passaro, S., Ferranti, L., de Alteriis, G., (2011). The use of high resolution elevation histograms for mapping
submerged terraces: a test from the Eastern Tyrrhenian Sea and the Eastern Atlantic Ocean. Quat. Int.,
232, 1-2, 238-249.
Santoro, E., Ferranti, L., Passaro, S., Burrato, P., Morelli, D., (2012). Morphometric analysis in the offshore
of the southern Taranto Gulf: unveiling the structures controlling the Late Pleistocene-Holocene
bathymetric evolution. Rend. On. Soc. Geol. It., 21 (2), 1132-1135
Architecture and Pliocene to Recent evolution of the offshore prolongation of the Granitola - Castelvetrano Thrust System (Sicily Channel)
No full textHigh-resolution, seismic profiles were recorded in the offshore of Mazara - Punta Granitola with the purpose of
reconstructing the architecture and Pliocene to Recent evolution of the south-west prolongation of the Granitola-
Castelvetrano Thrust System, identified as an active structure possibly related to destructive historical earthquakes
(Barreca et al., 2014; Ferranti et al., this meeting).
A number of seismic units were identified. The oldest one is interpreted as representative of the Lower Pliocene
pelagic deposits known in the region as Trubi. Lower-middle Pleistocene calcarenites are widespread along the
continental shelf (CS) between Mazara del Vallo while their top rapidly deepens moving southeast-ward Capo
Granitola. In this area, lower-middle Pleistocene calcarenites are unconformably overlain by the late Pleistocene-
Holocene deposits. These latter are thin or absent NW of Punta Granitola along the CS, at water depth less than ~30 m,
suggesting that this sector experienced uplift during the Quaternary.
Small scale, NW- and SE-displacing reverse faults are observed along the CS where they cut the lower-middle
Pleistocene calcarenites and offset the seafloor. South-eastwards, south-east-verging, reverse faults affect lower-middle
Pleistocene calcarenites as well as the late Pleistocene-Holocene layers, suggesting that fault displacement acted during
the post-LGM.
Growth folding of Upper Pleistocene-Holocene deposits and thrust faults, predominantly dipping to the NW,
affecting Pliocene rocks are observed in the immediate offshore Capo Granitola.
The integration of the new data with those obtained from multi-channel profiles suggests that the active folds and
thrusts are the uppermost expression of steep crustal ramps (Monaco et al., 1996; Lavecchia et al., 2007; Meccariello et
al., this meeting) which upthrust the Saccense platform at depth
High-performance microbial removal of ethanol from contaminated air
No full textEthanol vapour from air was removed using a bioreactor (2.7 m(3)) packed with a novel engineered material consisting of a highly porous inorganic matrix coated with activated carbon. The system was operated over a period of two months varying the inlet ethanol between 90 and 2200 mg m(-3). Removal efficiencies ranging from 80 to 99.9% were obtained. A simplified kinetic model of the bioreactor was developed and used to estimate the maximum degradation rate and to predict thermal effects resulting from ethanol oxidation
Tutor di M. E. Mazzella: Deformazione attiva nell'area peri-tirrenica meridionale da dati geodetici e geologici
No full textInnovative methodology for quantitative and qualitative assessment of water resources in karst aquifers: a case study in southern Lazio region, central Italy
No full textThis paper outlines the results of a hydrogeological study carried on from July 2014 to November 2106 to assess quantitatively and qualitatively water resources (groundwater and surface water) emerging in the Upper Valley of the Aniene River (Latium Region, Central Italy). This work deals with the Environmental Monitoring Plan, related to the catchment project of the Pertuso Spring, which is going to be exploited to supply an important water network in the South part of Roma district. The study area is located in the Upper Valley of the Aniene River, in the outcrop of Triassic-Cenozoic carbonate rocks, and belong to an important karst aquifer. Pertuso Spring is the main outlet of this karst aquifer and is the one of the most important water resource in the southeast part of Latium Region, used for drinking, agriculture and hydroelectric supplies. This hydrogeological system is characterized by a strong local hydraulic connectivity between the Aniene River surface water and groundwater coming from the Pertuso Spring.
First at all, in this study, in order to estimate the vulnerability degree of the karst aquifer feeding the Pertuso Spring, the COP method has been applied and vulnerability maps are proposed. Thus, with the aim of highlighting the karst features key-role in the unsaturated zone, a new vulnerability approach has been set up, starting from two discretization approaches. The aim of this work is to compare both results of the intrinsic vulnerability mapping, in order to evaluate which one is the most suitable for the study area.
On the basis of the hydrogeochemical data and their interpretations for groundwater and surface water, monitored from July 2014 to November 2016, a hydrogeological study has been carried on to identify flowpaths and hydrogeochemical processes governing groundwater-surface water interactions in this region. To this end, discharge surveys were carried out on four monitoring sections along the Aniene River. The proposed conceptual model shows that the karst aquifer feeding the Pertuso Spring supplies the Aniene River, highlighting seasonal variability depending on the rainfall regime.
The analysis of solute contents in the monitoring points has suggested the identification of the Magnesium ion as a conservative tracer in this specific system and, consequently, to the development an indirect method for the evaluation of karst spring discharge based on discharge measurements and water geochemical data. This method is based on the elaboration of surface water discharge measurements in relationship with Mg2+ concentration values, determined as for groundwater, coming from the Pertuso Spring, as for surface water samples, collected upstream and downstream the spring, along the Aniene River streamflow. This method has been validated by the comparison with discharge values obtained using the current meter method and by geochemical data.
This study suggests that the application of the Magnesium ion as an environmental tracer may provide a means to evaluate discharge of the Pertuso Spring, as it came up to be a marker of the mixing of surface water and groundwater. On the other hand, the Magnesium ion concentration provides information for the identification of groundwater flow systems and the main hydrogeochemical processes affecting the composition of water within the karst aquifer feeding the Pertuso Spring
Evidenze geomorfologiche sommerse nelle aree costiere italiane di uno stazionamento del livello del mare ubicato a circa -20 m e attribuito allo stadio 3
No full textUnderwater investigations along the Italian coasts have shown a recurrent paleo-sea level at -18÷-22 m below the present sea level. Geochronoiogical age determinations on submerged speleothems used as sea-level markers and sampled at around -20 m, suggest that the paleo-sea level corresponds to the highest stand reached by the sea during the isotope stage 3, between 48 and 27 ka. Geomorphological evidence of this paieo-sea level are remains of a subhorizontal abrasion surface, which is visible on cliffs bordering carbonate promontories. Analogous surfaces (terraces) are mainly observed in the Tyrrhenian Sea from Tuscany to Sicily and in Sardinia at similar depths (-16÷-22 m); examples are also visible along the Apulia's coast in the Adriatic Sea. Recurrent geomorphological features of these terraces are: a) discontinuous but frequent occurrence; b) width lower than 10 m; c) location at the base of ancient cliffs; d) notch and pot-holes at the inner margin; e) in many cases terraces are laterally connected with the wave-enlarged mouth and levelled bottom of submerged caves, and with the flat top of ancient buttes. The general tectonic stability since Eutyrrhenian times (stage 5e of the oxygen isotope curve) in the regions where the observed forms occur, confines the relative age to well definite times. The absolute age of the paleo-sea level is yielded by speleothems sampled at about -20 m b.s.l. in Tuscany. These display marine biogenic episodes interlayered with continental ones. The 14C radiometric ages of the different layers keep such alternating episodes within the time span ranging from 27 to 42 ka (Alessio et al. 1992; 1994), namely during the highstand related to the isotope stage 3 (Aharon & Chappel, 1986). It is concluded that abrasion terraces and related morphological features found within the same depth interval formed during the stage 3 oscillating highstand
An overview of "omic" analytical methods applied in bioactive peptide studies
No full textNowadays, there is an increased interest in health-promoting functional foods, whereby consumers hold higher expectations of health-promoting Benefits beyond basic nutrition. Dietary proteins provide a rich source of bioactive peptides, which are hidden in a latent state within the native protein, requiring enzymatic proteolysis for their release. Bioactive peptides can be produced during in vivo gastrointestinal digestion and/ or food processing. Lactic acid bacteria are among the most widely microorganisms used as starter cultures for the production of fermented foods, and through their proteolytic system, they contribute to the release of bioactive peptides from dietary proteins. In vitro and in vivo studies demonstrated several biological functions attributed to bioactive peptides, such as antimicrobial, immunomodulatory, enhancement of mineral absorption, antithrombotic, antihypertensive, opioid and antioxidant activities. The great complexity and the wide dynamic range of relative peptide abundance in these products severely challenge the capabilities of existing analytical methodologies. However, functional and comparative genomic studies as well as proteomic approaches provide a wealth of knowledge in the way in which these lactic acid bacteria can use food proteins releasing bioactive peptides.Fil: Saavedra, Maria Lucila. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Tucumán. Centro de Referencia Para Lactobacilos (i); ArgentinaFil: Hebert, Elvira Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Tucumán. Centro de Referencia Para Lactobacilos (i); ArgentinaFil: Minahk, Carlos Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas; Argentina. Universidad Nacional de Tucuman. Facultad de Bioquimica, Quimica y Farmacia. Instituto de Quimica Biologica; ArgentinaFil: Ferranti, Pascuale. Università degli Studi di Napoli Federico II; Itali
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