1,170 research outputs found
Le Fumarole di Vulcano
No full textIn tempi storici l’Isola di Vulcano è stata interessata da numerose eruzioni. Come già detto l’ultima
attività vulcanica è avvenuta fra il 1888 e il 1890. Da allora l’attività del vulcano è caratterizzata dalla presenza di numerose aree fumarolizzate...Published65 - 733.5. Geologia e storia dei vulcani ed evoluzione dei magmiope
Successione vulcano-sedimentaria triassica
No full textSuccessione vulcano-sedimentaria triassica delle Alpi Meridionali
Data for the synthesis of oligo-gamma-glutamylglutamines as model compounds for gamma-glutamyltransferases (GGTs) and for normalization of activities of different GGTs
No full textgamma-Glutamyltransferases (GGTs) are widespread, conserved enzymes that catalyze the transfer of the gamma-glutamyl moiety from a donor substrate to water (hydrolysis) or to an acceptor amino acid (transpeptidation) through the formation of a gamma-glutamyl enzyme intermediate.
Although the vast majority of the known GGTs has a short sequence called lid-loop covering the glutamate binding site, B. subtilis GGT and some other enzymes from Bacillus spp. lack the lid loop. In order to assess the possible role of the lid loop of GGTs in substrate selection, synthetic oligo-gamma-glutamylglutamines containing up to three gamma-glutamyl residues were used as model substrates. The activities of the enzymes under investigation were standardized with respect to a common reaction to ensure comparable results. The activity of an engineered mutant enzyme containing the amino acid sequence of the lid loop from E. coli GGT inserted into the backbone of B. subtilis GGT was compared to that of the lid loop-deficient B. subtilis GGT and the lid loop-carrier E. coli GGT (Calvio, Romagnuolo, Vulcano, Speranza, Morelli Enz. Micr. Technol. 2018 [1]). Here we report the experimental procedures for the synthesis of model substrates gamma-glutamylglutamines through the method of the N-phtaloyl-L-glutamic acid anhydride and the spectral data of the synthetized compounds. The data obtained in the normalization procedure of the activities of the three enzymes are also reported
Geographical Information System and Volcanology : Documentation of temperature measurements of the fumaroles at Vulcano island, Italy - a case study
No full textLa Fossa crater (Vulcano Island southern Italy) is a well documented volcano since its last eruption (1888 - 1890). Moreover, in the framework of the geochemical surveillance, systematic survey of fluids from fumaroles have been carried out at Vulcano since 1987. That's why we took it for our project. The purpose of the project is to create an internet resource which saves time to all researchers as it will publish available and future temperature measurements of fumaroles from La Fossa crater, Vulcano Island.PublishedTeneriffe, Canarian Islandsope
Geographical Information System and Volcanology : Documentation of temperature measurements of the fumaroles at Vulcano island, Italy - a case study
No full textLa Fossa crater (Vulcano Island southern Italy) is a well documented volcano since its last eruption (1888 - 1890). Moreover, in the framework of the geochemical surveillance, systematic survey of fluids from fumaroles have been carried out at Vulcano since 1987. That's why we took it for our project. The purpose of the project is to create an internet resource which saves time to all researchers as it will publish available and future temperature measurements of fumaroles from La Fossa crater, Vulcano Island.PublishedTeneriffe, Canarian Islandsope
Continuous SO2 flux measurements for Vulcano Island, Italy
No full textThe La Fossa cone of Vulcano Island (Aeolian Archipelago, Italy) is a closed conduit volcano. Today, Vulcano Island is characterized by sulfataric activity, with a large fumarolic field that is mainly located in the summit area. A scanning differential optical absorption spectroscopy instrument designed by the Optical Sensing Group of Chalmers University of Technology in Göteborg, Sweden, was installed in the framework of the European project "Network for Observation of Volcanic and Atmospheric Change", in March 2008. This study presents the first dataset of SO2 plume fluxes recorded for a closed volcanic system. Between 2008 and 2010, the SO2 fluxes recorded showed average values of 12 t.d–1 during the normal sulfataric activity of Vulcano Island, with one exceptional event of strong degassing that occurred between September and December, 2009, when the SO2 emissions reached up to 100 t.d–1.</p
Diffuse CO2 soil degassing and CO2 and H2S air concentration and related hazard at Vulcano Island (Aeolian arc, Italy).
No full textLa Fossa crater on Vulcano Island is quiescent since 1890. Periodically it undergoes “crises” characterized by
marked increase of temperature (T), gas output and concentration of magmatic components in the crater
fumaroles (T may exceed 600 °C). During these crises, which so far did not lead to any eruptive reactivation,
the diffuse CO2 soil degassing also increases and in December 2005 an anomalous CO2 flux of 1350 tons/day
was estimated by 1588 measurements over a surface of 1.66 km2
extending from La Fossa crater to the
inhabited zone of Vulcano Porto. The crater area and two other anomalously degassing sites (Levante Beach
and Palizzi) have been periodically investigated from December 2004 to August 2010 for diffuse CO2 soil flux.
They show a marked variation with time of the degassing rate, with synchronous maxima in December 2005.
Carbon dioxide soil flux and environmental parameters have been also continuously monitored for over one
year by an automatic station at Vulcano Porto. In order to assess the hazard of the endogenous gas emissions,
CO2 and H2S air concentrations have been measured by Tunable Diode Laser profiles near the fumaroles of the
crater rim and of the Levante Beach area, where also the viscous gas flux has been estimated. In addition, CO2
air concentration has been measured both indoor and outdoor in an inhabited sector of Vulcano Porto. Results
show that in some sites usually frequented by tourists there is a dangerous H2S air concentration and CO2
exceeds the hazardous thresholds in some Vulcano houses. These zones should be immediately monitored for
gas hazard should a new crisis arise.INGV-DPC programme - Project V5-Diffuse degassing in Italy; Airplane FIRB project of the Italian Ministry of the University and ResearchPublished130-1441.2. TTC - Sorveglianza geochimica delle aree vulcaniche attiveJCR Journalpartially_ope
Transpressive strain on the Lipari–Vulcano volcanic complex and dynamics of the “La Fossa” cone (Aeolian Islands, Sicily) revealed by GPS surveys on a dense network
No full textGround deformation resulting from the last two GPS surveys carried out in March 2006 and September 2007 on the Lipari–Vulcano volcanic complex are analyzed. Data inversion was performed by Genetic Algorithms
approach, using the horizontal strain measured on 258 GPS baselines, in order to avoid bias due to the ambiguity in fixing the reference system and to disregard the vertical deformation of the “La Fossa” cone.
There are two networks in this area: the main Lipari–Vulcano network and the denser Vulcano–Nord one. Surveying strategies adopted for the main network during the latest surveys allowed long baselines, from
Lipari and Vulcano to the surrounding permanent stations in the southern Tyrrhenian, to be processed with reliable accuracy. The fast-static strategy was instead adopted to survey the Vulcano–Nord network. Data from the main Lipari–Vulcano network has been processed in the ITRF05 frame and also in a local reference frame together with the Vulcano–Nord data. A significant Northward motion of Vulcano island with respect to the ITRF05 has been detected. This motion abruptly decreases in the northern part of Vulcano, suggesting a
decoupling of the main Vulcano island from the rest of the volcanic complex. The analysis in the local reference frame evidenced a relative SSE-ward motion of Lipari and Northern part of Vulcano, with respect to the central and southern Vulcano. This comparison also highlights a local uplift of the “La Fossa” cone. In addition, a strain tensor analysis was performed, which highlighted a main NNE–SSW contraction and a minor ESE–WNW extension detected only on the southern part of Vulcano. This results are in agreement with a transpressive kinematics of the Lipari–Vulcano volcanic complex, with a main dextral component of displacement along a NW–SE striking structure.Published64-701.3. TTC - Sorveglianza geodetica delle aree vulcaniche attiveJCR Journalreserve
Long-time variation of soil CO2 fluxes at the summit crater of Vulcano (Italy)
No full textHere, we report the first continuous data of geochemical
parameters acquired directly from the active summit
crater of Vulcano. This approach provides a means to
better investigate deep geochemical processes associated
with the degassing system of Vulcano Island. In particular,
we report on soil CO2 fluxes from the upper part of Vulcano,
a closed-conduit volcano, from September 2007 to October
2010. Large variations in the soil CO2 and plume SO2 fluxes
(order of magnitude), coinciding with other discontinuous
geochemical parameters (CO2 concentrations in fumarole
gas) and physical parameters (increase of shallow seismic
activity and fumarole temperatures) have been recorded.
The results from this work suggest new prospects for
strengthening geochemical monitoring of volcanic activity
and for improving the constraints in the construction of a
“geochemical model”, this being a necessary condition to
better understand the functioning of volcanic systems.Published1859-18632V. Dinamiche di unrest e scenari pre-eruttivi4V. Vulcani e ambiente5V. Sorveglianza vulcanica ed emergenze1R. Reti di monitoraggio e OsservazioniJCR Journalrestricte
Type Minerals from the Island of Vulcano, Aeolian archipelago, Sicily, Italy
No full textThe Aeolian archipelago consists of seven islands of volcanic origin, arranged along an arc 90
km long that extends westward with other submerged volcanoes. The Vulcano Island is the
southernmost and the third largest of these islands.
The island of Vulcano has an age of about 120,000 years...Istituto Nazionale di Geofisica e VulcanologiaPublishedNICOLOSI (CATANIA)3.5. Geologia e storia dei vulcani ed evoluzione dei magmiope
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