1,721,032 research outputs found
2nd Field Course on Coral Reef Biogeology
No full textIl presente corso è rivolto principalmente agli studenti e dottorandi in Scienze Geologiche, Scienze Naturali e di Biologia Marina, ma è aperto anche a Docenti e Ricercatori o a professionisti interessati alle tematiche del corso.
Il corso si articolerà in una serie di lezioni ed attività sul campo il cui scopo principale è di fornire ai partecipanti strumenti per l’indagine e lo studio degli ambienti di scogliera attuali e delle biocostruzioni pleistoceniche affioranti nell'area
Tumors of the gastrointestinal smooth muscle: histological patterns, biological behaviour, prognosis.
No full textTumors of the gastrointestinal smooth muscle: histological patterns, biological behaviour, prognosis
Uncommon sponges associated with deep coral bank and maerl habitats in the Strait of Sicily (Mediterranean Sea)
No full textLa calcolosi residua e recidiva del coledoco. Endoscopia v/s chirurgia. Risultati a medio-lungo termine.
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High-resolution geochemical records from Mediterranean cold-water corals: proxies for paleoclimate and paleoenvironmental reconstructions and the role of coral physiology
No full textThe chemical composition of the skeletal hard parts of the azooxanthellate scleractinian coral Desmophyllum dianthus retrieved from various sites in the Mediterranean Basin was analysed by laser ablation ICP-MS in order to investigate the potential of this species as paleoenvironmental and paleoclimate archive and assess the organism’s physiology control on the chemical signal The coral calcification is a biologically-mediated process which can induce large geochemical offset from the expected equilibrium values and this is particularly evident once the analytical spatial resolution is increased. Our data suggest that the majority of the elements analysed (B/Ca, Mg/Ca, Sr/Ca, U/Ca, P/Ca) show a strong spatial heterogeneity linked to the coral microstructure (centres of calcification vs. fibrous aragonite), with some of the elements varying by more than a factor of four.
Given the near constant environment in which azooxanthellate corals live, factors other than temperature, such as the different precipitation rate and/or the different organic content between
COCs and FA, might be responsible for the geochemical heterogeneity. The skeletal portion close to the outer septal surface displays low variability of the geochemical signal and so it is considered the best candidate for paleoenvironmental reconstructions. Therefore, the possibility to retrieve reliable paleoenvironmental information from D. dianthus can be achieved by a selective sampling of specific ultra-structures, in order to minimise ‘vital effect’, non-carbonatic contaminations, and
reduce noise on paleoclimate and paleoenvironmental signals
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
Field course on coral reef biogeology - Red Sea - Egypt
No full textIl presente corso è rivolto principalmente agli studenti e dottorandi in Scienze Geologiche, Scienze Naturali e di Biologia Marina, ma è aperto anche a Docenti e Ricercatori o a professionisti interessati alle tematiche del corso.
Il corso si articolerà in una serie di lezioni ed attività sul campo il cui scopo principale è di fornire ai partecipanti strumenti per l’indagine e lo studio degli ambienti di scogliera attuali e delle biocostruzioni pleistoceniche affioranti nell'area
Paleoecological, bio-sedimentological and taphonomic analysis of Plio-Pleistocene biocalcarenite deposits from northern Apennines and Sicily (Italy)
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