1,720,978 research outputs found
Molluschi terrestri e dulciacquicoli di Sicilia della collezione F. Minà Palumbo di Castelbuono.
No full textFRANCESCO MINÀ PALUMBO (1814-1899) è una delle personalità che ha maggiormente contribuito alla conoscenza della Storia Naturale in Sicilia. Medico e naturalista, dotato di grande statura umana e culturale, fu anche ottimo disegnatore, veterinario, agropatologo e autore di numerose pubblicazioni su vari argomenti. Si è occupato dell’esplorazione naturalistica delle Madonie non tralasciando gli aspetti antropologici e archeologici. Le sue collezioni naturalistiche e la biblioteca sono attualmente custodite presso l’omonimo Museo di Castelbuono.
In questo libro viene descritta e illustrata la collezione dei Molluschi terrestri e dulciacquicoli di Sicilia, recentemente riscoperta, sistemata, catalogata, restaurata (ove necessario) e fotografata dagli autori.
Questa collezione, di considerevole valore scientifico, offre un’ampia rappresentazione faunistica e contiene materiale sintipico; numerose le testimonianaze, con bigliettini originali scritti a mano da diversi studiosi dell’epoca; di grande importanza la presenza di materiale tipico, donato al Minà Palumbo dagli stessi autori descrittori delle specie in oggetto. Nel corso di questo lavoro sono state designate anche le serie tipiche (lectotipi) di due specie: Cochlostoma affinis (Benoit, 1882) e “Valvata” bocconii Calcara, 1842
Infine, tutti questi reperti, al di là dei chiarimenti tassonomici connessi al loro riesame, assumono ulteriore rilievo se riletti anche in una chiave ecologica, finalizzata alla ricostruzione del pregresso stato di contesti naturali siciliani che, nel tempo, hanno talvolta subito profonde modificazioni
Brevi considerazioni sulla presenza di due molluschi dulciacquicoli alloctoni a Pantelleria (Canale di Sicilia)
No full textTwo allochthonous freshwater molluscs are reported for Pantelleria Island (Sicilian Chanel): Lymnaea stagnalis (Linnaeus,1758) (Lymnaeidae) and Physella (Acutiana) acuta (Draparnaud, 1805) (Physidae). These species, which represented the first two species of freshwater molluscs reported in Pantelleria, were introduced to the island
through aquatic plants imported from Northern Italy for ornamental use. In the last two years, in which we can
constantly monitor these two species, we have documented a rapid increase in their populations. In consideration
of the particular island environment, we will continue to monitor the presence of these two species in
Pantelleria
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Alvania acida sp. nov., a new late Quaternary gastropod adapted to the shallow-marine CO2 seep of Vulcano Island
No full textSubmarine CO2 emissions are a recent (probably younger than about 5 ka) expression of volcanism at Vulcano Island (off NE Sicily), a Mediterranean natural laboratory for the study of ocean acidification. An impoverished molluskan association is known from the naturally acidified waters of Vulcano, at Levante Bay, where pH drops to 5.64. Here we describe a new gastropod, Alvania acida sp. nov., living in the bay, and found at the nearby site of Capo Milazzo (NE coast of Sicily) within a Late Pleistocene paleocommunity related to vegetated bottoms. The study species underwent a habitat change during its short evolutionary history, resulting in the recent adaptation to the CO2 seep at Vulcano. Similarly to the gastropods Tritia corniculum and T. neritea from the same seep, A. acida was up to 24% smaller than fossil shells from Milazzo, showing a further probable case of adaptation to high-CO2 waters through dwarfing. The new species shows distinctive features: an inflated shell; very convex, axially ribbed whorls; weak spiral cords. Because of its current distribution, limited to Levante Bay, and anthropogenic pressure from tourism affecting the site, A. acida deserves protection
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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