1,721,184 research outputs found
Leptospira infection in wild animals
No full textLeptospira is a Gram-negative bacterium that causes leptospirosis, one of the most important re-emerging zoonotic diseases. The disease is worldwide diffused, and animals are involved in its spreading. Among animals, wildlife play an important role in the epidemiology of leptospirosis, as reservoir of specific Leptospira serovar. Several species are known as Leptospira maintenance host, but other are less investigated and could represent a “new” host involved in its epidemiology. The book “Leptospira Infection in Wild Animals” contains descriptions of leptospirosis epidemiology in several wild animal species, highlighting the infection in different part of world, the most detected Leptospira serovar and the risks of infection for both humans and domestic animals. Data on marine mammals, wild boar, rodent, lagomorph, wild ruminants, amphibian and reptiles, bats and non-human primates Leptospira infection were deeply analysed and discussed in order to better understand their role in the leptospirosis epidemiology
caratterizzazione degli intonaci mediante l'impiego di metodologie mineralogico-petrografiche
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Provenance and Technology in the composition of Impasto and Figulina wares from Madonna di Ripalta and Coppa Nevigata (Foggia-Italy)
No full textThe paste composition of Bronze age pottery from southern Italy is analysed by microanalyses in order to compare the clays ised in paste prepartio
Varibilità tecnologica o di provienza? Problemi di interpretazione dei dati analitici relativi alla ceramica di impasto e figulina protostorica della Puglia settentrionale (Italia)
No full textLe diversità composizionali nelle ceramiche di impasto e figuline da madonna do Ripalta e Coppa Nevigata osservate mediante analisi archeometriche d'insieme (chimica e minero-petrografica) non sempre sono risulutive per destinguere le diversità tecnologiche tra le classi ceramiche da quelle di area di produzione. In questo studio si presentano i risultati di un test di microanalisi (SEM-EDS) sulla sola matrice argillosa che suggeriscono l'uso di vari tipi di argille per le diverse classi ceramiche
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
What kind of volcanite the rock-hewn churches of the Lalibela UNESCO's world heritage site are made of?
No full textWhat kind of volcanite the rock-hewn churches of the Lalibela UNESCO's World Heritage Site are made of ?
No full textThe extraordinary monumental complex of the 11 rock-hewn churches of Lalibela, included in the UNESCO’s world heritage list since 1978, attracted the attention of the conservation science community mainly for their severe chemical weathering, physical decay and structural instability. This study, based on classical modal mineralogy and petrography of samples coming from seven churches (Biet Medhane-Alem, Biet Mariam, Trinity Church, Biet Giyorgis, Biet Amanuel, Biet Abba-Lebanos and Biet Gabriel Rufael), sorts out ambiguous rock-nomenclatures and lithological definitions, which have been found in the literature of the last three decades. We can now affirm that the churches were carved in hydrothermally altered and partially lateritized basaltic scorias (nearly aphyric and highly vesicular). The hewn rock, often reported in literature as “weathered basic tuffs”, can be thus classified as a basaltic scoria deposit, partially welded by syn-post magmatic hydrothermal alteration. Its pyroclastic origin may have strongly enhanced selective weathering. The hewn rock rests on a massive to slightly fractured basalt, still present as bedrock of the Lalibela churches and belonging to lava sequences of the Northern Ethiopian Plateau (continental flood basalts). Despite the severe hydrothermal alteration and partial lateritization of the samples, modal mineralogy, petrography and major-trace elements chemistry strongly suggest that the studied clinopyroxene-olivine transitional basaltic scorias of the churches derive from the same magma type, which gave rise to the Lalibela high-titanium group 2 (HT2) of the Northern Ethiopian Plateau lava flows. The late-stage and post-magmatic phases (smectites, zeolites and calcite) scattered in the groundmass and filling the large subspherical vesicles of the basaltic scorias really represent a typical hydrothermal facies of continental flood basalts. Most of the secondary hydrothermal minerals are pointed out first, as well as appropriate modal mineralogy and petrography, providing useful insights towards unraveling the causes of deterioration of these world heritage monuments. A special emphasis is devoted to the presence of zeolite minerals, never pointed out before this study in the rock-hewn churches of Lalibela, and their possible roles on cyclic adsorbing and release of water
The Florentine art of painting on tile in the fifteenth-sixteenth centuries: Evidences from the examination of artworks by Fra Bartolommeo
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