Search results for " Petr"
showing 10 items of 1574 documents
Micro-RNAs miR-375-3p and miR-7-5p are released alongside ACTH from corticotroph pituitary neuroendocrine tumor
2021
AbstractObjectiveCirculating miRNAs are found in bodily fluids including plasma and can serve as biomarkers for diseases. The aim of this study was to provide the first insight into the landscape of circulating miRNAs in close proximity to the adrenocorticotropic hormone (ACTH) secreting PitNET. To achieve this objective next-generation sequencing of miRNAs in plasma from bilateral inferior petrosal sinus sampling (BIPSS) - a gold standard in diagnosing ACTH-secreting PitNETs, was carried out.MethodsSinistral (left) and dextral (right) BIPSS blood samples of the patient were collected in three time points: before the administration of corticotropin-releasing hormone, 5 and 15 minutes after …
First combined flux chamber survey of mercury and CO2 emissions from soil diffuse degassing at Solfatara of Pozzuoli crater, Campi Flegrei (Italy): M…
2014
Abstract There have been limited studies to date targeting gaseous elemental mercury (GEM) flux from soil emission in enriched volcanic substrates and its relation with CO 2 release and tectonic structures. In order to evaluate and understand the processes of soil–air exchanges involved at Solfatara of Pozzuoli volcano, the most active zone of Campi Flegrei caldera (Italy), an intensive field measurement survey has been achieved in September 2013 by using high-time resolution techniques. Soil–air exchange fluxes of GEM and CO 2 have been measured simultaneously at 116 points, widely distributed within the crater. Quantification of gas flux has been assessed by using field accumulation chamb…
New Inferences on Magma Dynamics in Melilitite-Carbonatite Volcanoes: The Case Study of Mt. Vulture (Southern Italy)
2022
This study provides the first micro-thermometric data of fluid inclusions (FIs) in mafic loose (disaggregated) xenocrysts and ultramafic xenoliths in explosive products of the melilitite-carbonatite Mt. Vulture volcano (southern Italy). Pure CO2 late stage FIs hosted in rock-forming minerals of wehrlite xenoliths and clinopyroxene xenocrysts were trapped at the local crust-mantle boundary (32 km). In contrast, trapping pressures within the loose olivine xenocrysts are from 3.2 to 4.5 kbar (8–13 km). Considering the ongoing degassing of mantle-derived CO2 rich gases, together with seismic evidences of the presence of low amount of melts at depth, and the tectonic control of the past volcanic…
Production technology of early-Hellenistic lime-based mortars from a Punic-Roman residential area at Palermo (Sicily)
2016
The topic of this study was the mineralogical and petrographic characterization of lime-based mortars of Hellenistic-Roman age (3rd century BC), taken from a residential area located in the historical centre of Palermo, near the walls of the Punic-Roman Neapolis, recently brought to light by excavations carried out by the Soprintendenza BB.CC.AA. of Palermo at Palazzo del Gran Cancelliere (Palermo). The collected mortars have been analyzed by optical microscopy (PLM), X-ray powder diffraction analysis (XRPD) and scanning electron microscopy coupled with energy dispersive spectrometry (SEM-EDS). The study was aimed to define the “recipe” (composition of temper and binder, temper size distrib…
Zemes dzīļu bagātības Latvijā: KAĻĶAKMENS
2022
Buklets "Zemes dzīļu bagātības Latvijā: KAĻĶAKMENS" iepazīstina ar vienu no Latvijas vērtīgākajiem dabas resursiem, tā daudzveidību un tajā atklātajiem interesantajiem minerāliem. Iekļauta informācija par perma periodā veidojušos kaļķakmeņu pētniecību un atšķirīgajiem pielietojuma veidiem. Bukletu ilustrē Latvijas Universitātes Muzeja Ģeoloģijas kolekciju kaļķakmens paraugu fotogrāfijas.
Experimental Procedures of Accelerated Aging and Evaluation of Effectiveness of Nanostructured Products for the Protection of Volterra (Italy) Panchi…
2022
The aims of the research were to evaluate the effectiveness of the application of nanostructured products on Volterra calcarenite stone and to define the experimental conditions and procedures of accelerated aging tests, able to simulate different degradation on the studied lithotype. The work focused on methods of performing accelerated aging tests in order to simulate different effects of environmental decay involving stone used on a historical site. The rock samples were examined before and after three treatment types: cyclic salt spray chamber, cycles of freezing–thawing and cycles of thermal shock. After each artificial aging cycle, changes in appearance were noted and chemical and phy…
Natural Halogen Emissions to the Atmosphere: Sources, Flux, and Environmental Impact
2022
Understanding the atmospheric geochemical cycle of both natural and anthropogenic halogens is important because of the detrimental effect halogens have on the environment, notably on tropospheric and stratospheric ozone. Oceans are the primary natural source for atmospheric Cl, F, Br, and I, but anthropogenic emissions are still important, especially for Cl. While emissions of human-made halocarbons (e.g., chlorofluorocarbons or CFCs) are expected to continue to decrease allowing progressive stratospheric ozone recovery, volcanic activity (e.g., clusters of mid-scale explosive eruptions or large-scale explosive eruptions) might disturb this recovery over the next decades. This review provid…
A revision of the structure and stratigraphy of pre-Green Tuff ignimbrites at Pantelleria (Strait of Sicily)
2013
International audience; At Pantelleria, peralkaline silicic magmas were erupted across a range of eruptive typologies and magnitudes: pyroclastic flows, Plinian to strombolian pumice fallout and lava flows. In this paper we focus on the intermediate cycle of eruptive activity which is bracketed by ignimbrite units slightly older than the two caldera collapses which marked the volcanological activity of the island. This age interval (180-85 ka) was punctuated by six ignimbrite-forming eruptions (silicic and variably peralkaline) for a cumulative erupted magma volume of approximately 6 km3 dense rock equivalent. Based on new 40Ar/39Ar (Na,K)-feldspar ages and petrographic data, we propose an …
«Et pongon man ne le tue treccie sparte»: appunti sulla ricezione del Petrarca politico nella lirica cinquecentesca
2017
Il contributo si interroga sulla ricezione del Petrarca civile nella lirica cinquecentesca, soffermandosi sull’analisi di alcuni componimenti di produzione compresa tra gli anni Trenta e Cinquanta del Cinquecento che a vario titolo riportano la figurazione femminile dell’Italia attingendo rime, lessico e argomenti dalle canzoni politiche dei Fragmenta. Accanto alla continuità dello stesso codice retorico se ne segnalano le istanze di sperimentazione interna e i differenti contesti di riutilizzo.
Dal mantello terrestre ai vulcani. Uno sguardo al vulcanismo degli ultimi 2 Ma nel Mediterraneo.
2017
Gli esperimenti ad alta pressione e temperatura (petrologia sperimentale) sono il mezzo più efficace di cui si dispone per la conoscenza dell’interno della Terra, dalla crosta al nucleo. Gli apparati necessari alla riproduzione delle temperature (comprese tra i 1000 e gli oltre 3500 °C) e pressioni variabili dai 10 kbar agli oltre 3 Mbar (corrispondenti a profondità comprese tra 30 e 5000 km), sono particolarmente sofisticati e sono accoppiati a raffinati metodi di analisi dei prodotti sperimentali (durante e dopo gli esperimenti). A questo tipo di studi si deve la conoscenza dell’ interno della Terra, soprattutto della Terra Inaccessibile (mantello inferiore e nucleo), avendo permesso di c…