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Riscoperta di Megistostoma rostratum (Deshayes, 1830) (Mollusca: Philinidae) nel Pliocene italiano
No full textThree specimens of Megistostoma rostratum (Deshayes, 1830) have been found in the classical
Ligurian Pliocene outcrops of Rio Torsero and Caranchi, near Ceriale, Savona County. This species
was described by Deshayes on a specimen from Pliocene clays of Piacenza, deposited in the École
des Mines in Paris. Sacco in 1897 was not been able to see the type material, and, in his Monograph
of fossil molluscs from Piedmont and Liguria, he described and figured a specimen of M. rostratum
from the Gourbesville Pliocene (France). The finding of the specimens described in this work allows
us to confirm the presence of this elusive species in the Italian Pliocene.Gastropoda, Philinidae, Megistostoma, Pliocene, Liguri
New data on Cymenorytis (Gastropoda, Vanikoridae) from Mediterranean-Atlantic Pliocene and Paratethyan Miocene, with the description of two new species.
No full textThis study is based on Cymenorytis COSSMANN 1888 specimens from several Italian and Spanish Pliocene localities. Two species, C. landaui and C. dellabellai, which were reported before correlated to Macromphalus brandenburgi (BOETTGER 1907), are described as new. C. brandenburgi is described and illustrated, on the basis of specimens from Ukraine and a comparison with a paratype from Costei, Romania, and this is the first report of this species for the Middle Miocene (Badenian) of Ukraine. C. landaui is known only from the Mediterranean Pliocene of Estepona (Spain), while C. dellabellai has a more wide distribution, the Mediterranean Pliocene (several N. Italian localities), and the European Atlantic Pliocene (Huelva, Spain)
A new species of Ischnochiton (Mollusca: Polyplacophora) from the Pleistocene of S. Italy
No full textA new species of Ischnochiton from the late Pleistocene of Archi S. Francesco (Reggio Calabria) is described in this paper. Valves of Ischnochiton crovatoi sp. nov. were found in the sandy-pebbly marine sediments of Archi S. Francesco (located on the left side of the Valley of the river Torbido), very rich in mollusks of infralittoral to circalittoral facies. The new species is characterized by the tegmental sculpture of head valve, lateral areas of intermediate valves and postmucronal area of tail valve consisting of nodulose radial riblets. The differences between the new specie and I. rissoi (Payraudeau, 1826) and I. zbyi Dell’Angelo & Silva, 2003 are discussed
First record of Xenostrobus securis (Lamarck, 1819) (Bivalvia Mytilidae) from Central Tyrrhenian Sea (Western Mediterranean).
No full textNuovi record di Mareleptopoma minor (Almera & Bofill, 1898) (Gastropoda: Pickworthiidae) per il Pliocene italiano
No full textMembrane sialic acid and behaviour in vivo of rabbit "stress" macroreticulocytes.
No full textMembranes of rabbit reticulocytes obtained by phenylhydrazine stimulation have a chemical composition different from that of normal erythrocytes; sialic acid/protein and cholesterol/protein ratios are in fact lower than normal. In vivo study of 51Cr-labelled reticulocytes show that these cells are quickly removed from blood and, after a short "homing" in liver, return to peripheral blood. During "homing" in the liver, the sialic acid/protein ratio seems to increas
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
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