STUDIO ETNOARCHEOMETRICO DI MALTE AEREE A LEGANTE GESSOSO NELL’AREA DELLE MADONIE (SICILIA SETTENTRIONALE)

The Madonie Regional Park, which covers an area of about 400 square kilometres, is an ideal context where environment and man activities are still mixed harmoniously. In the last years a variety of ethno-archaeometric investigations have been carried out in order to study various aspects of the "material culture" of this territory. In particular, the research was focused on the production of majolica which have had a great importance since the early decades of the 16th century thanks to the geolithological features of the Madonie area, particularly rich in clayey raw material. The traditional building techniques of the Madonie which involve several typologies of building materials (used for ordinary masonry, decorative elements, in the manufacture of artificial aggregates) were also influenced by the geological characteristics of the territory. In this direction, several studies have been recently organized in order to identify the ancient sources of raw materials and the reconstruction of the so-called "productive chain". The present contribution is aimed to the characterization of gypsum-based mortars locally made and widely employed on building tradition of the Madonie area. These were made using gypsum as raw material extracted in the same area and fired in special furnaces that today are testified only by few ruins. The examined samples are representative of gypsum mortars used on local stone-built structure. The study, enriched by documentary/ethnographic research on traditional kilns, locally called "carcare", was conducted by means of mineralogical and petrographic methods (XRD, optical microscopy and SEM-EDS) with the aim to characterize historic mortars in terms of composition and texture and recover the ancient recipes and also localize the source area of raw materials. The data obtained will be useful for planning the restoration (integration or replacement) of historic buildings in the area

Natural and anthropogenic sources of total suspended particulate and their contribution to the formation of black crusts on building stone materials of Catania (Sicily)

Blackening and disaggregation of exposed surfaces of stone monuments are well-known effects of stone decay taking place in polluted urban environments all over the world. This paper aims to assess the contribution of natural and anthropogenic sources of total suspended particulate (TSP) causing permanent damage (black crusts) to the stone monuments of Catania (Sicily), one of the most popular ‘‘cities of art’’ of southern Italy. Atmospheric pollution of Catania, a typical Mediterranean coastal town, is mainly contributed by vehicle exhaust emissions rather than industrial ones. Episodically, the city also suffers gaseous and ash emissions (plumes) from the nearby Mount Etna volcano. Thus, to discriminate between natural and anthropogenic contributions to stone decay on Catania monuments, black crusts and TSP were sampled within the urban area and subjected to specific analytical procedures (optical microscopy, X-ray powder diffraction, Fourier transformed infrared spectroscopy, scanning electron microscopy equipped with energy dispersive spectrometry, ionic chromatography and dual inlet mass spectrometry). Mineralogical, chemical and isotopic characterization of black crusts and TSP provided new insights concerning the partition of sulfate sources in this particular urban context. The influence of Mount Etna emissions on both TSP and black crusts compositions was shown. Nevertheless, the key role of anthropogenic sources in the total sulfate budget was confirmed, while sea spray and volcanic emissions were found to make subordinate contributions. Quantitative data useful for the identification of the threshold pollution levels for preventive conservation of Catania monuments were obtained

Phenols content and 2-D electrophoresis protein pattern: a promising tool to monitor Posidonia meadows health state

<p>Abstract</p> <p>Background</p> <p>The endemic seagrass <it>Posidonia oceanica </it>(L.) Delile colonizes soft bottoms producing highly productive meadows that play a crucial role in coastal ecosystems dynamics. Human activities and natural events are responsible for a widespread meadows regression; to date the identification of "diagnostic" tools to monitor conservation status is a critical issue. In this study the feasibility of a novel tool to evaluate ecological impacts on <it>Posidonia </it>meadows has been tested. Quantification of a putative stress indicator, <it>i.e</it>. phenols content, has been coupled to 2-D electrophoretic protein analysis of rhizome samples.</p> <p>Results</p> <p>The overall expression pattern from <it>Posidonia </it>rhizome was determined using a preliminary proteomic approach, 437 protein spots were characterized by p<it>I </it>and molecular weight. We found that protein expression differs in samples belonging to sites with high or low phenols: 22 unique protein spots are peculiar of "low phenols" and 27 other spots characterize "high phenols" samples.</p> <p>Conclusion</p> <p><it>Posidonia </it>showed phenols variations within the meadow, that probably reflect the heterogeneity of environmental pressures. In addition, comparison of the 2-D electrophoresis patterns allowed to highlight qualitative protein expression differences in response to these pressures. These differences may account for changes in metabolic/physiological pathways as adaptation to stress. A combined approach, based on phenols content determination and 2-D electrophoresis protein pattern, seems a promising tool to monitor <it>Posidonia </it>meadows health state.</p

Volcanogenic particulates and gases from Etna volcano (Italy)

Volcanic emissions represent one of the most relevant natural sources of trace elements to the troposphere. Due to their potential toxicity they may have important environmental impacts from the local to the global scale and they can severely affect the atmospheric and terrestrial environment also at timescales ranging from a few to million years. Etna volcano is known as one of the largest global contributors of magmatic gases (CO2, SO2, and halogens) and particulate matter, including some toxic trace elements. The aim of this study was to characterize the chemical composition and the mineralogical features of the volcanogenic aerosol passively emitted from Mt. Etna. Nine samples were collected by using the filtration technique at different sites on summer 2010 and 2011. Chemical and mineralogical analyses allowed to discriminate two main constituents: the first is mainly referable to the silicate component in the volcanic plume, like lithic and juvenile fragments, crystals (e.g., plagioclases, pyroxenes, oxides) and shards of volcanic glass; the second one is linked to the soluble components like sulfosalts or halide minerals (sulfates, chlorides and fluorides). These investigations are especially important in the study area because the summit of Mt. Etna is yearly visited by nearly one hundred thousand tourists that are exposed to potentially harmful compounds

Study of the effects of salt crystallisation on degradation of limestone rocks

Salt crystallization is widely recognized as a cause of deterioration of porous building materials. In particular, the crystallization pressure of salt crystals growing in confined pores is found to be the main cause for damage. The aim of this study is to better understand the degradation of porous rocks induced by salt crystallisation and correlate such processes with the intrinsic characteristics of materials. With this intend, an experimental salt weathering simulation has been carried out on two limestones widely used in the Baroque architecture of eastern Sicily. A systematic approach including petrographic, porosimetric and colorimetric analyses, was used to evaluate the correlation among salt crystallisation, microstructural and chromatic variations of limestone. Results showed a quite different resistance of the two limestones to salt damage, and this was found to be strongly dependent on their pore structure and textural characteristics

Environmental impact assessment on the Monza cathedral (Italy): a multi-analytical approach

This research deals with the characterization of black crusts collected from the Dome of Monza (Milan, Italy). Air pollution is responsible for the degradation of historical buildings surfaces. In urban and industrial areas, the degradation process is accelerated, due to carbonaceous particles and heavy metals emitted by combustion processes which contribute to the formation of black crust (BCs). In this study the characterization of BC was performed using different analytical techniques such as: HRSEM-EDX, IC, LA-ICP/MS and digital image analysis. In particular, the research focused on the study of "heavy metals" which contribute to the identify the main sources of pollution responsible for the surface’s deterioration over time. BCs variability in composition also depends on the exposure of the analyzed surfaces.J. Santiago Pozo-Antonio thanks the Spanish Ministry of Economy and Competitiveness (MINECO) for his “Juan de la Cierva-incorporación” (IJCI-2017-3277) contract. C. Cardell thanks the financial support provided by Spanish Research Projects AERIMPACT (CGL2012-30729) and EXPOAIR (P12-FQM-1889), the European Regional Development Fund (ERDF), and the Andalusian Research Group RNM-179. SEM-EDX analyses were performed in the Scientific Instrumentation Centre (CIC) of the University of Granada (Spain)

Definition of analytical cleaning procedures for archaeological pottery from underwater environments: The case study of samples from Baia (Naples, South Italy)

Abstract This work is focused on a multidisciplinary study of 13 pottery fragments collected in the submerged archaeological site of Baia (Naples, Italy). Founded by the Romans in the 1st century B.C., this archaeological area represents one of the greatest evidences of Roman architecture and it includes ancient ruins whose structures range from maritime villas and imperial buildings. Several diagnostic tests were carried out in order to characterize the archaeological materials, their structure and properties, as well as the alteration and degradation products. Degradation forms in seawater imply not only a variation in the physico-mechanical and chemical properties of the material but also an aesthetic damage, due to superficial deposits, which can lead to the illegibility of the artefacts. In this context, it is crucial to determine to what extent these decay factors, mainly attributable to biological growth, could affect the durability of pottery and what are the effects of cleaning procedures. The work offers further elements to obtain new insights into the underwater cultural heritage field and in the function of ceramic matter, especially related to several applications in technology and in the adoption of strategies for suitable conservation procedures

Le postazioni militari cartaginesi della prima guerra punica su Monte Pellegrino (Palermo)

The excavation in the park of Villa Belmonte (Monte Pellegrino, Palermo) has brought to light several warehouses, made with a “pseudo-frame” technique, probably with a straw roof, used for the storage of foodstuffs, given the large quantity of Punic-type amphorae found in situ, datable to around the middle of the third century BC. In addition, a section of road - about 3 m wide that proceeds in the direction of WNW- ESE, consisting of two layers of use - has been intercepted. We believe to have tracked down part of a strategic/military station used by the Carthaginian army during the crucial years of the First Punic War.Lo scavo nel parco di Villa Belmonte (Monte Pellegrino, Palermo) ha messo in luce diversi ambienti, realizzati con una tecnica a “pseudo telaio” probabilmente con copertura straminea, adoperati per lo stoccaggio di derrate data la grande quantità di anfore di tipo punico rinvenute in situ, databili intorno alla metà del III sec. a.C. Inoltre, si è intercettato un tratto di strada larga circa 3 m che procede in direzione WNW- ESE, costituita da due battuti. Si ritiene di avere rintracciato parte di una postazione a carattere strategico/militare utilizzata dall’esercito cartaginese durante gli anni cruciali della I guerra punica