1,721,032 research outputs found
Neotropical mammals in natural history collections and research in Rome, Italy
Full text linkThe occurrence and the history of Neotropical mammal specimens in the collections of naturalistic museums in Rome,
Italy, and their scientific utilization is here reviewed. These specimens belong to several scientific expeditions made after
the discovery of the new Continent. The oldest specimens date back to the famous Museum of Athanasius Kircher at
the Collegio Romano (1651) and to the Museo Zoologico della Università di Roma that was established inside the University
of the Pontificial State (Archigymnasium) (1823). Many of these early specimens are now lost due to the complex history
of Roman scientific museology, but some specimens are now available mainly in two institutions, the Museo Civico di
Zoologia (established in 1932) and the Museo di Anatomia Comparata “Battista Grassi” of “Sapienza” University of Rome
(1935). Among the numerous specimens, is noteworthy the presence of a hairy long-nosed armadillo, Dasypus pilosus,
the first record in an Italian zoological collection and the 26th known specimen of this species in world museums. More
recently, some Roman researchers have maintained a scientific interest for Neotropical mammals, including primates,
with collaboration with South American mammalogists. A greater historical knowledge of scientific activities concerning
the work of Italians researchers on Neotropical biodiversity should be pursued
Pattern of gene flow across chromosomal hybrid zones in the house mouse Mus musculus domesticus
No full textMus musculus domesticus: evoluzione cromosomica, filogeografia e morfometria geometrica delle popolazioni dell’arcipelago delle isole Eolie (Sicilia, Italia).
No full textA complete view of chromosomal and mtDNA relationships among areas of chromosomal polymorphism in the House Mouse, Mus domesticus
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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
Podarcis siculus latastei (Bedriaga, 1879) of the western pontine islands (italy) raised to the species rank, and a brief taxonomic overview of podarcis lizards
Full text linkIn recent years, great attention has been paid to many Podarcis species for which the observed intra-specific variability often revealed species complexes still characterized by an unresolved relationship. When compared to other species, P. siculus underwent fewer revisions and the number of species hidden within this taxon may have been, therefore, underestimated. However, recent studies based on genetic and morphological data highlighted a marked differentiation of the populations inhabiting the Western Pontine Archipelago. In the present work we used published genetic data (three mitochondrial and three nuclear gene fragments) from 25 Podarcis species to provide a multilocus phylogeny of the genus in order to understand the degree of differentiation of the Western Pontine populations. In addition, we analyzed new morphometric traits (scale counts) of 151 specimens from the main islands of the Pontine Archipelago. The phylogenetic analysis revealed five principal Podarcis groups with biogeographic consistency. The genetic distinctiveness of the Podarcis populations of the Western Pontine Islands is similar or even more ancient than those observed in numerous other pairs of Podarcis sister species. In the light of these evidences we raise the Western Pontine lizards to specific rank; thus they should be referred to as Podarcis latastei
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