1,720,985 research outputs found
THE TRIASSIC INSECTS FROM MONTE SAN GIORGIO: SYSTEMATICS AND PALEOENVIRONMENTAL IMPLICATIONS
Full text linkA collection of 16 specimens of insects (both adult and larval forms) collected between 1997 and 2003 in the Lower Kalkschieferzone (KSZ) at the Val Mara site D near Meride (Canton Ticino, Svizzera), Monte San Giorgio by the UNIMI team lead by Prof. A. Tintori and Dr. C. Lombardo and with the support by Dr. Markus Felber, then curator at the Museo Cantonale di S.N. in Lugano (MCSN) are here described and the paleoenvironmental implications of this entomofauna is discussed. Monte San Giorgio is a Triassic fossil lagerstätte inscribed since 2003 in the UNESCO World Heritage for its vertebrate fossils, but the importance of its fossil insects is coming into light. The insect assemblage has proved to be exceptional under two aspects: it includes the most ancient fossil record for four groups and it provides the most ancient record of nervous structures (cerebrum and nerve cord) in insects, thanks to preservation through phosphatization. The Kalkschieferzone entomofauna is also quite diverse, including representatives of seven orders, both terrestrial and aquatic, suggesting the existence of a much more complex and stable terrestrial habitat than a carbonatic platform could support
Spinal cord lesion after penicillin gluteal injection
No full textPenicillin gluteal injection may cause sudden and irreversible paraplegia. In the literature 6 cases have been reported, and spinal infarction was conjectured, the mechanism being obscure. The actual incidence of such a complication is not known. We observed 2 more cases, 6 and 16 years respectively following such an injection. The clinical features suggested that spinal infarction had occurred, and an MRI study in the most severely impaired patient showed marked spinal atrophy, giving further support to the spinal infarction hypothesis. These findings and the pathophysiological considerations suggest that the mechanism might be the accidental injection into the superior gluteal artery, causing its distal spasm and the upstream ascent of the penicillin with ensuing embolic and/or spastic occlusion of the arterior spinal artery
Japanese Green Tea: radioactivity measurements, radiochemical extraction yield determination and some radioprotection considerations
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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
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
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