Search results for "Ambiente"
showing 10 items of 1727 documents
The use of leaves of Olea europaea L. as passive samplers for polycyclic aromatic hydrocarbons. Assessment of the quality of the air in Palermo
2000
Interest in polynuclear aromatic hydrocarbons (PAHS), both from an analytical and an environmental point of view, arises from the fact that although most of them have absolutely no practical use, they are widely diffused into the environment. Their widespread distribution means that every individue is unwittingly exposed to the action of this class of substances, in working environments, in the home and in the open air. In this paper, Oleae europaea leaves have been used as passive samplers. The correlation obtained clearly shows that the quantitative analysis of PAHs in the Olea leaves permits to evaluate the quality of air, in a determined geographic area, without the need of making long …
Polycyclic aromatic hydrocarbons (PAHs) in the polychaete Sabella spallanzanii, as a reliable bioindicator, by GCMS
2012
Every year 230.000 tons of PAHs enter the marine environment, resulting ubiquitously distributed worldwide. These compounds are aromatic molecules of special concern because of their toxic and carcinogenic properties. As a consequence of their hydrophobic nature, in aquatic environments, PAHs rapidly tend to associate with particulate matter and sediments represent the most important reservoir. In the present study the level of PAHs in the sessile filter-feeder polychaete Sabella spallanzanii was assessed. In particular, the concentration of PAHs was determined in polychaetes (body and tube) collected from three Sicilian areas, subject to different anthropic pressure. A transplanting experi…
Leukoma antiqua (Bivalvia) - A high-resolution marine paleoclimate archive for southern South America?
2018
The Patagonian Sea in the SW Atlantic is one of the most productive marine ecosystems worldwide. Besides its economic relevance, this shelf sea serves as a major sink for atmospheric CO2 and thus plays a major role in global climate. Despite that, the marine climate dynamics in that region remain barely known. Instrumental records only cover the last 30 years or so and high-resolution climate archives are currently not available. Here, we explore the possibility to obtain seasonally to inter-annually resolved paleotemperature data from shells of the bivalve mollusk, Leukoma antiqua collected alive from the shallow subtidal zone of the San Jorge Gulf. Results demonstrate that this species gr…
Microanalytical method for studying paintings by use of fluorescence spectroscopy combined with principal component analysis
2013
Abstract The study of several different naturally aged films of organic painting materials, is described. Materials studied include drying oils (walnut, poppy seed and linseed oil) resin-based paint varnishes (the triterpenoid dammar and the diterpenoids sandarac and turpentine) and protein-based binding media (egg yolk and casein). A not expensive methodology for a rapid identification of binding media and varnishes, that applies principal component analysis (PCA) to Excitation Emission (EE) fluorescence spectra, is proposed. PCA was performed on a data matrix where the rows represent studied materials and columns the variables; the variables include the fluorescence intensities associated…
Chemical characterization of ancient potteries from Himera and Pestavecchia necropolis (Sicily, Italy) by Inductively Coupled Plasma–Optical Emission…
2011
Abstract Thirty-eight samples of pottery were analyzed for determining chemical composition in order to establish their provenance. The potteries tested in the present research come from Himera and Pestavecchia archaeological sites. After digestion in microwave oven, the samples have been analyzed for fourteen minor elements (Ba, Cd, Co, Cr, Cu, Ga, Li, Mn, Ni, Pb, Sr, Ti, Tl, and Zn) and six major elements (Al, Ca, Fe, K, Mg, and Na). Chemical analysis was carried out by Inductively Coupled Plasma–Optical Emission Spectroscopy (ICP–OES). The most abundant minor elements are Cr, Ba and Ni. Cr concentration ranged from 66 to 3635 mg kg − 1 , Ba concentration ranged from 388 to 2677 mg kg − 1…
Study on the adsorption of PCBs in alginate Montmorillonite beads by GC-MS analysis
2013
STUDIO DELLA BIODISTRIBUZIONE DI SOSTANZE BIOLOGICAMENTE ATTIVE IN ORGANISMI ACQUATICI
2022
Caratterizzazione termomeccanica dell’acido polilattico e due suoi compositi
2018
Questa memoria presenta i test sperimentali per la caratterizzazione termomeccanica del biopolimero acido polilattico e dei suoi compositi con farina di faggio o con nanorinforzo di montmorillonite modifcata, per uno studio di applicabilità nel settore automobilistico. Per la caratterizzazione meccanica e il confronto dei risultati vengono eseguiti prove di coppia e di trazione; i test dinamici vengono eseguiti per la caratterizzazione termomeccanica, determinando il modulo elastico e il fattore di perdita rispetto alla temperatura effettiva. This paper presents the experimental tests for the thermomechanical characterization of biopolymer polylactic acid, and its composites with beech flour…
Paesaggio, beni comuni e patrimonio UNESCO
2018
Secondo l’Istituto di ricerca, l’area più colpita risulta essere il Settentrione, con una differenziazione del pattern di crescita tra est ed ovest: se fino al 2008 il Nord-Est aveva velocità di crescita maggiore, negli ultimi anni, nelle regioni del Nord-Ovest, il trend del consumo di suolo mostra un’accelerazione, mentre il Triveneto e l’Emilia Romagna seguono, nel complesso, l’andamento generale del fenomeno, con una certa tendenza al rallentamento della velocità di trasformazione. Se negli anni ’50 il Centro e il Sud Italia mostrano percentuali di suolo consumato simili, successivamente il Centro si distacca con valori in netta crescita, raggiungendo i valori medi nazionali che, nel com…
La planificación del paisaje en la Comunidad Valenciana: análisis de la calidad y fragilidad visual
2007
La calidad y fragilidad visual del paisaje adquiere relevancia con el objeto de la gestión en el marco de la planificación del paisaje y Se pone en evidencia espacialmente su nueva dimensión jurídica en la ordenación del territorio en la Comunidad Valenciana. Se revisan sus procedimientos de análisis que se concretan con ejemplos de experiencias en esta comunidad, para diferentes escalas y objetivos. También se específica la conveniencia de la integración de ambas para determinar el valor de la conservación del paisaje. La reglamentación actual se encauza en estos términos, ofrece la oportunidad de desarrollo de estos atributos para la efectiva planificación del paisaje y los utiliza para l…