975 research outputs found
Effects of organic and metallorganic pollutants on European gastropod species
No full textIl presente progetto di Dottorato sviluppa due diverse linee di ricerca volte a verificare la possibilità di utilizzare comuni molluschi gasteropodi come 'organismi sentinella' per programmi di biomonitoraggio basati sull'approccio 'multibiomarkers' ed il possibile contributo dei PCB nell'induzione del fenomeno di Imposex nei gasteropodi. Relativamente alla prima linea di ricerca sono state condotte due indagini in campo volte a verificare la capacità di una selezionata batteria di 'biomarker' (Intersex/Imposex, Comet assay, MN assay, NRR assay e FRAP assay) di discriminare popolazioni naturali di 'Littorina littorea' e 'Hexaplex trunculus' sottoposte a differenti condizioni di stress. La caratterizzazione tossicologica è stata effettuata in parallelo alla descrizione chimica del bioaccumulo di comuni inquinanti organici (PAH, OTC, PCB e OCP). Relativamente alla seconda linea di ricerca sono stati condotti tre esperimenti "pilota" volti a definire alcuni aspetti del disegno sperimentale di un'esposizione cronica a PCB di individui della specie 'Nassarius nitidus' mediante la dieta.The present PhD project develops two research lines addressed to verify the suitability of common gastropod species as 'sentinel organisms' for multibiomarkers-based monitoring programs and the possible involvement of PCB in the induction of Imposex phenomenon in gastropods. In the context of the first research line two fiel surveys were carried out in order to assess the potential of selected suites of biomarkers (Intersex/Imposex, Comet assay, MN assay, NRR assay and FRAP assay) in discriminating natural populations of 'Littorina littorea' and 'Hexaplex trunculus' experiencing different stress conditions. The toxicological characterization was coupled with the chemical description of organic contaminants' bioaccumulation pattern (PAH, OTC, PCB and OCP). For the second research line three "pilot" tests were carried out for setting the experimental design of a long-term dietary exposition of 'Nassarius nitidus' specimens to PCB environmental concentrations
Handling concentration data below the analytical limit in environmental mixture risk assessment: A case-study on pesticide river monitoring
No full text: Aquatic organisms are exposed to ever-changing complex mixtures of chemicals throughout their lifetime. Component-Based Mixture Risk Assessment (CBMRA) is a well-established methodology for water contaminant-mixture management, the use of which is growing due to improved access to reference ecotoxicity data and extensive monitoring datasets. It enables the translation of measured exposure concentrations of chemicals into biological effect values, and thus to quantitatively estimate the risk of the whole water sample (i.e., as a mixture). However, many factors can bias the final risk decision by impacting the risk metric components; thus, a careful design of the CBMRA is needed, taking into primary consideration the specific features of the dataset and mixture risk assessment assignments. This study systematically addressed the effects of the most common approaches used for handling the concentrations of chemicals below the limit of detection/quantification (LOD/LOQ) in CBMRA. The main results included: i) an informed CBMRA procedure that enables the tracking of the risk decisions triggered by substances below LOD/LOQ, ii) a conceptual map and guidance criteria to support the selection of the most suitable approach for specific scenarios and related interpretation; iii) a guided implementation of the informed CBMRA on dataset of pesticide concentrations in Italian rivers in 2020 (702,097 records)
Turkey and Bosnia- Herzegovina: A Future Re ecting on the Past
No full textPublished by: SETA FOUNDATION FOR POLITICAL ECONOMIC AND SOCIAL RESEARCH
Reşit Galip Cd. Hereke Sokak No: 10
GOP Çankaya 06700 Ankara TÜRKİYEBosnia-Herzegovina remains as divided as ever. In the past year Turkish foreign policy in Bosnia-Herzegovina has become more assertive and outcome-oriented. The successes of the new Turkish assertiveness have helped to initiate a much- needed reconciliation process between Serbia and Bosnia-Herzegovina. Turkey derives its assertiveness not only from Foreign Minister Davutoğlu’s vision of sustainable peace but also from its shared history and cultural practices throughout the region. Turkey’s efforts could strengthen the efforts of the international community to integrate BiH into European and trans-Atlantic bodies
Organotin compounds in touristic marinas of the northern Adriatic Sea: occurrence, speciation and potential recycling at the sediment-water interface
No full textButyltin compound (BTC) contamination was evaluated in two north Adriatic marinas, San Rocco (Italy) and Lucija (Slovenia).
BTC sedimentary concentrations (121 ± 46 and 352 ± 30 ng Sn g−1 in San Rocco and Lucija, respectively) evidenced the past use of antifouling paints, confirmed by the reduced tributyltin content (~ 46%) with respect to the sumof BTC. Elemental and organic carbon isotopic (δ13C) analyses of bulk sediments and its lipid and humic substances were performed in order to evaluate their role in BTC partitioning and preservation. The δ13C of sedimentary bulk and refractory organic matter suggested that diagenetic processes could play a role in the preservation or release of pollutants. No contamination was found in water collected from the benthic chamber and thus, fluxes at the sediment-water interface were not assessed, except for MBT efflux at Lucija (28.9 ng Sn m−2 day−1). Nevertheless, BTC concentrations in porewaters (up to 75 ng Sn l−1) and rather low sediment-porewater partitioning coefficients (Kd) with respect to the data reported in the literature would suggest a potential risk of the reintroduction of BTC into the water column at both sites: at Lucija, sedimentary contamination is high despite the greater Log Kd, whilst at San Rocco, the low BTC concentration is associated with a reduced sediment affinity
Kosovo and Turkey: What Lies Ahead?
No full textPublished by: SETA FOUNDATION FOR POLITICAL ECONOMIC AND SOCIAL RESEARCH
Reşit Galip Cd. Hereke Sokak No: 10
GOP Çankaya 06700 Ankara TÜRKİYEThe International Court of Justice (ICJ) advisory opinion on 22 July 2010, affirmed the legality of the Republic of Kosovo’s declaration of independence. Yet it is an unspoken truth that Kosovo needs a compromise with Serbia to receive international recognition. Turkey can contribute to bridging relations between Belgrade and Pristina by identifying ways of cooperation on technical issues concerning the living standards of all Kosovar citizens without getting entangled on the issue of recognition. Turkey can play a complimentary and even crucial role that could actually ease the task of the European Union between Serbia and Kosovo
Esperienze di un editore di melodrammi
No full textThe critical edition of an opera has to tackle problems partially unknown to the literary text criticism. Such issues derive primarily from the multilayered character of the operatic text, which is made of words, sounds, scenery, stage action, transmitted from sources of different sorts (scores, librettos, stage arrangements, set design sketches). Secondly, problems arise from the nature of musical and theatrical languages: the written text is not an end in itself, but a premise to the properly artistic event, the performance. The critical editing of an opera must be concerned not only to reconstruct an “authentic” text, that is a text in accordance with the author’s thought, but also to how the same text can be used by today’s performers in order to arrange different stagings.
The author illustrates these issues with examples from 19th-century operas edited by him—Rossini’s Adina and Bellini’s I Puritani—which have already passed the scrutiny of the performance
"Der Dichter spricht...". La voce del poeta nel 'Torquato Tasso' di Donizetti
No full textBetween the eighteenth and nineteenth centuries many literary, figurative, and musical works took inspiration from the lives of celebrated ancient and modern artists. In particular, the unhappy events in the life of Torquato Tasso were of the greatest appeal; the author of Aminta and La Gerusalemme liberata became an emblem of the romantic artist, constantly in conflict with the surrounding world. Among these works, Ferretti’s and Donizetti’s melodramma semiserio Torquato Tasso (1833) is unique in the fact that the authors let the character Tasso to deliver poetic fragments extracted from the works of the real Tasso, interspersed throughout the dramatic dialogue. This device is aimed to outline the portrait of the hero in his complex relationship with the courtly society, and to show the poet in the very act of creating; it is highlighted both in the libretto (by the use of italics) and in the music: citations appear only in recitative sections, within which some of them are emphasized by the use of the arioso singing. The essay shows how this calculated use of literary and musical devices generates a multi-layered game of mirrors. Through it one can listen, as in perspective, different voices: that of the character; that of the real poet, or rather of the image the posterity has constructed of him. Lastly, the voice of the opera’s authors, who use Tasso’s poetry in order to express their concerns about of the Italian literary and musical tradition, in a historical juncture in which its identity is being challenged
Corsuccio da Sascorbaro ed il suo \u27\u27Vennicello dalla seta"
No full textCorsuccio da Sascorbaro\u27s studies are reported. This Author, already in 1581 gave useful and accurate informations on silkworm breeding.Viene commentato il lavoro di Corsuccio da Sascorbaro che gia nel 1581 forniva utili e precise indicazioni sul corretto allevamento del baco da seta
Composite Cu-LaFeO3 conversion coatings on a 18Cr ferritic stainless steel for IT-SOFC interconnects: Effect of long-term air exposure at 700◦C on Cr diffusion barrier and electrical properties
No full textIn our previous study copper oxide additions were used to accelerate the formation of perovskite LaFeO3 conversion coatings on stainless steels from molten carbonate baths. Incorporation of copper particles into the growing coating was an additional effect resulting in the formation of a composite Cu-LaFeO3 structure. In continuation to our previous study, the aim of this work is to report the effect of copper additions on long-term stability and performance of perovskite conversion coatings under IT-SOFC interconnect conditions. To this end, a Cu-LaFeO3 coated K41 18Cr ferritic stainless steel was examined in air at 700◦C up to 1000 h. In order to simulate properly the situation of a real IT-SOFC cell, Area Specific Resistance (ASR) and Cr-barrier properties of the coated steel were evaluated simultaneously with a special coating characterization setup. Studies were conducted by comparison with single-phase LaFeO3 coatings obtained in a molten carbonate bath similar to that used for the formation of the composite Cu-LaFeO3 coatings but without the addition of copper oxide. Copper addition did not change the general morphology of the perovskite coating, which remains a multi-layer coating, being composed of an outer LaFeO3 crystalline layer, a middle Fe-rich oxide and two inner Fe-Cr rich oxide layers. However, copper was beneficial in promoting a thinner and more stable coating structure along with finer perovskite grain size. These structural improvements were further confirmed by the results obtained with electrical measurements that showed a better ASR behavior of the Cu-LaFeO3 coatings. On the other hand, no relevant copper effects could be detected on the coating oxidation stability and on the Cr-barrier properties of the perovskite conversion coatings. Both LaFeO3 and Cu-LaFeO3 coatings showed similarly high coating stability and excellent Cr-barrier capability in experiments conducted at 700◦C up to 1000 h. In definitive, dual-phase Cu-LaFeO3 seem more promising systems for IT-SOFC interconnects than single-phase LaFeO3 conversion coatings, although further improvements in ASR electrical properties are needed. © The Author(s) 2018
Imposex levels and butyltin compounds (BTs) in Hexaplex trunculus (Linnaeus, 1758) from the northern Adriatic Sea (Italy): Ecological risk assessment before and after the ban
No full text- …
