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Ceschin S.,Third University of Rome | Bisceglie S.,Third University of Rome | Ricci S.,Superior Institute for Conservation and Restoration
Cryptogamie, Algologie | Year: 2012

There are no specific studies on freshwater red algae from Italy, and the few existing data are reported in broader studies on algae of rivers. The aim of this paper is to contribute to the knowledge of this algal group in Italy, providing data on their distribution, morphological features and ecology. Samples of Lemanea fluviatilis, L. sudetica and Batrachospermum gelatinosum were collected from 5 stations in the Tiber River basin (Central Italy). The recorded taxa are known as typical elements of European rivers' algal flora, however they were reported in a few times in Italy. Our records, therefore, have widened their geographical distribution. Morever, the finding of L. sudetica was, for the first time, recorded with certainty in rivers of Central Italy. © 2012 Adac. Tous droits réservés. Source

Ceschin S.,Third University of Rome | Ricci S.,Superior Institute for Conservation and Restoration | Abati S.,Third University of Rome | Abati S.,ENEA | And 3 more authors.
Fundamental and Applied Limnology | Year: 2013

Freshwater red algae are rarely documented in Italy, although their presence is quite common in European watercourses. The few data available about this algal group are reported in broader studies concerning algal flora of Italian rivers. This paper is aimed to broaden the knowledge on red algae in Italian running waters, by providing new findings on this algal group occurrence in Italy. Samples of Lemanea fluviatilis, Batrachospermum gelatinosum, Bangia atropurpurea, Compsopogon caeruleus, Hildenbrandia rivularis and samples at sporophytic Chantransia stage, were collected from 29 sites along 16 watercourses of central Italy. For each species, we provided a review on the geographical distribution, mainly at European and Italian scale. We also contributed to better define the autoecology of these species, by increasing data on their ecology and defining quantitatively their ecological responses to main environmental factors. In this study we recorded the first finding of a spontaneous population of the subtropical C. caeruleus in Italy. © 2013E. Schweizerbart'sche Verlagsbuchhandlung. Source

Luvidi L.,CNR Institute of Neuroscience | Mecchi A.M.,CNR Institute of Neuroscience | Ferretti M.,CNR Institute of Neuroscience | Sidoti G.,Superior Institute for Conservation and Restoration
International Journal of Conservation Science | Year: 2016

Cleaning stone surfaces is a crucial issue as irreversible and potentially harmful for the stone itself. Inadequate interventions might cause damage also visible over the time. Moreover they often have to be repeated, especially in urban areas, where the surfaces are more subjected to dusts deposition and pollution alterations. In order to reduce the need for cleaning, TiO2-based treatments have been proposed for their self-cleaning, depollution and antibacterial properties. These products are currently used to coat the outdoor surfaces of buildings but little experience has so far been made in the field of Cultural Heritage. This paper concerns the experiments carried out to evaluate efficiency, durability and harmfulness of three different TiO2-based products, either in form of nanoparticles or mixed with hydrophobic polymers, used to treat three carbonatic stones. A polydimethylsiloxane as reference polymer was used. Specimens of these stones were exposed to an urban polluted outdoor environment for eight months. The specimens were investigated by colorimetric measurements, surface observations and X-ray microanalyses by electron microscopy, contact angle measurements, Rhodamine tests, ion chromatography measurements and elemental analyses by X-ray fluorescence. The results showed that the photocatalytic products have a mild self-cleaning effect depending on the stone and tend to be easily washed away by the rain. Source

Ceschin S.,Third University of Rome | Ricci S.,Superior Institute for Conservation and Restoration | Bisceglie S.,Third University of Rome
Cryptogamie, Algologie | Year: 2010

The floristic composition and spatial distribution of algal communities in 97 stations in the Tiber River and its tributaries were studied. A total of 128 taxa were found, belonging mainly to the Chlorophyta, Bacillariophyta and Cyanophyta. Filamentous algae (Cladophora glomerata, Vaucheria geminata, Oedogonium sp. and Spirogyra spp.) were the most common and abundant species. Melosira varions, Cocconeis pediculus, Gomphonema olivaceum, Cyclotella meneghiniana, Fragilaria crotonensis, Leptolyngbya valderiana and several species of Oscillatoria were also widely distributed but they were not important in terms of biomass. Spatial variations of species richness were found, with the middle and upstream sections showing a wider range of taxa than the downstream sections. Chamaesiphon incrustans and Lemanea fluviatilis were found only in the upstream sections of some watercourses of the basin in fast-flowing, cool, well-oxygenated waters, while Stigeoclonium tenue and Ulva flexuosa was recorded exclusively in downstream sections with slow-flowing, warm and eutrophic waters. © 2010 Adac. Tous droits réservés. Source

Perasso C.S.,Superior Institute for Conservation and Restoration | Ricci S.,Superior Institute for Conservation and Restoration | Petriaggi B.D.,Superior Institute for Conservation and Restoration | Calcinai B.,Marche Polytechnic University
International Biodeterioration and Biodegradation | Year: 2015

This research has been conducted on archaeological artifacts collected from the Grotta Azzurra (Capri, Naples, Italy). Endolithic microbiota and boring Porifera responsible for bioerosion and micro-erosion were analysed. SEM observations permitted the analysis of biodegradation. Embedding casting procedure with polyester resins allowed the identification of three different microborer traces, corresponding to green algae, fungi and boring sponges. According to spicule complement two excavating species and other four sponge species were recorded inside the bored cavities. In addition, the species Cliona janitrix is here reported, for the first time, into archaeological artifacts. Traces of the green alga Ostreobium quekettii (ichnospecies Ichnoreticulina elegans) were found to dominate in all samples; traces of three species of microfungi were abundant. Microscopic pitting patterns and resin casts produced by different boring sponges into marble samples have been examined. Different kinds of micro-erosion are characterized by various types of ornamentation and sculpturing patterns. The data confirm that endolithic chlorophytes and fungi together with macroboring organisms, especially boring sponges, play a significant role in biodeterioration processes of submerged lapideous artifacts. © 2014 Elsevier Ltd. Source

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