1,721,114 research outputs found
Catalogo della Mostra I tesori della Catterdale di Ales. Argenti sacri e documenti d'Archivio (secc. XV_XVII)
No full text“I Tesori della Cattedrale di Ales. Argenti sacri e documenti d’Archivio secc. XV-XIX », Seminario Tridentino, Ales marzo-maggio 1997
No full textCatalogo della Mostra Le pergamene dell'Archivio Storico Comunale di Oristano. Secc. XV-XVII
No full text
Environmental mineralogy in the mining area of Montevecchio Ponente (SW Sardinia)
No full textThe Montevecchio mining area (Arbus – Guspini, Sardinia SW) has been exploited for centuries, for the
extraction of lead and zinc minerals.
The following work focuses on the study and characterization of the sources and contaminants present in
the “Cantieri Sanna” from the area of Montevecchio Ponente.
There is a large amount of mining residues in the area downstream of the washing plants, affected by
important erosion phenomena, which involve a solid transport of contaminants in solution.
These mineral residues were characterized by diffractometric (XRD) and chemical analysis (ICP-MS), after
their solubilization. The whitish biomineral patinas present along the Rio Roia Cani were also analyzed by
means of diffractometric analysis and a scanning electron microscope (SEM).
From the analysis carried out, the presence of secondary phases emerged, such as: epsomite, glaucocerinite,
goethite, hydroxyapatite, minium, nantokite, plumbojarosite and zincite, indicating a remarkable reactivity
of the tailings with atmospheric agents; these results made it possible to identify tailings as a source of
contamination. Furthermore, the presence of sub-economic contents of rare earths elements (REE), more
particularly of light rare earths elements (LREE), and of Al, Fe, Pb and Zn emerged.
Biomineralization occurs in the area was found in the streambed of rio Roja Cani; it appears like that which
forms in the bed of the rio Naracauli, described in detail in Medas et al. (2014).
SEM-EDS analysis confirm that biomineralization is mediated by bacterial activity, due to the filamentous
and tubular structures present in biofilms; furthermore, the presence of zinc and oxygen emerges from the
compositional maps, confirming that the biomineralization is composed of hydrozincite, as revealed by the
XRD analysis.
We argued that this biomineralization rules natural attenuation of zinc as already found in rio Naracauli
(Wanty et al., 2013; De Giudici et al., 2014)
Phosphodiesterase 8B (PDE8B) gene variants and TSH levels
No full textIt has been estimated that 40-60% of the variation of serum TSH levels is under genetic control. In
keeping with this notion, polymorphisms of several genes potentially involved in the control of thyroid
function have been linked to serum TSH concentrations. Genome-wide association scan (GWAS) is a
powerful tool to simplify genetic analysis of complex traits and diseases. By genotyping >360,000
single nucleotide polymorphisms (SNP) in a large cohort of 4,300 Sardinian subjects, we recently
identified a strong association (p = 1.3 x 10-11) between alleles of the SNP rs4704397 and serum
TSH. This association was confirmed in two genetically unrelated cohorts from Tuscany and the Old
Order Amish and contributed to the 2.3% of the total variation of circulating TSH concentration. The
rs4704397 SNP is located in intron 1 of the phosphodiesterase 8B (PDE8B) gene, encoding a highaffinity
cAMP-specific phosphodiesterase abundantly expressed in thyroid tissue. This suggests that
different PDE8B variants may modulate c-AMP-dependent thyroid hormone secretion and affect by
feed-back pituitary TSH production. So far at least one independent study confirmed that the minor A
allele of the rs4704397 SNP is associated with higher serum TSH in a cohort of pregnant women.
In conclusion PDE8B is an important gene involved in controlling serum TSH concentration in
normal individuals. Further studies are needed to ascertain whether and to what extent PDE8B may
also represent a candidate gene for thyroid dysfunction and/or response to treatment
RADIOLOGICAL CHARACTERIZAZION OF THE GRANITOID SARDINIAN DIMENSION STONES
No full textA large part of Sardinia, about 6,000 Km2 in total area, consists of Sardinia-Corsica Batholith
plutonic rocks. Particularly in northern Sardinia, many granitoids are exploited as dimension
stones and traded worldwide. This study focuses on the radiological characterization using in
situ gamma ray spectrometry of seven main plutonic dimension stones (Rosa Beta,
Ghiandone, Giallo San Giacomo, Rosa Cinzia, Grigio Malaga, Bianco Sardo and Grigio
Perla) in order to characterize their radiological hazard for ornamental/superficial or bulk
utilises as recommended by the EU standards
La Mappa Archivistica della Sardegna. Vol. III, 1/2:La Marmilla. CAGLIARI: Edizioni Regione Autonoma della Sardegna
No full textEsito di un progetto di Mappatura degli archivi delle diverse regioni storiche della sardegna, il volume, diviso in due tomi, comprende le schede normalizzate secondo gli standard di descrizione internazionali ISAD G e ISAAR CPF dei soggetti produttori e degli archivi della regione storica della Marmilla
Stone in the city. Extraction sites and spoliation of stone materials in the city of Nora (South -West Sardinia)
Full text linkIn this study we intend to read the "backstage" of the urban scene in the archaeological city of Nora, in the southwestern coasts of Sardinia, with the aim of identifying main urban processes that take into account the ancient supply and circulation of building materials essential for the urban formation. The intention is to create a different point of view in order to get a comprehensive picture of the urban form and characteristics, and also to define the social, cultural and economic context which led to the birth and development of the local building language, and to understand the relationship between the city and geo-resources in the surrounding region.In particular, the work intends to focus to the historical extraction sites and to the movement of construction materials, without neglecting the spoliation of monuments, to identify the plots between geology and urban structure, also in order to evidence as the historic cities possessed an unconscious smart approach. The choice of the city of Nora is not accidental; in fact, different kinds of local stones are undoubtedly the most widely used building materials within the city. The choice, optimization and use in buildings and urban infrastructures was masterly performed, without interruptions, from the late sixth century B.C. until at least the fourth or fifth century A.D. Already during his trip to Sardinia (1857) Alberto Ferrero La Marmora recognized in the peninsula of Is Fradis Minoris, close to the city ruins, traces of quarrying recorded in "quaternary grès" stone, widely used in buildings of Nora.. It will then Gennaro Pesce, who through his works (1957-1971) showed great interest in the main building materials and construction techniques used in Nora, providing insights on the architectural aspects, and then making a specific focus on building materials, wall structures and architectural taste in the city during Roman imperial age (IVth period of Nora). In particular, G. Pesce (1957) provided an essential list of stone materials mostfrequently used in Nora for buildings, which are: 1) carbonatic sandstone (Quaternary),2) fine-grained sandstone (Tertiary), 3) andesite (Tertiary), 4) limestone (Miocene); 5) pyroclastite (Miocene). The contribution wants to investigate the correlations between urban building and the aforesaid stone materials, whose extraction was proximal, and whose masterful use has allowed the construction of the city of Nora
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