1,721,094 research outputs found
Variazioni climatiche, tettonica e sedimentazione al passaggio Pliocene Medio-Pliocene Superiore nel bacino del Valdarno Superiore (Appennino Settentrionale).
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Dati sedimentologici relativi alla conoide di Loro Ciuffenna (Gruppo delle Conoidi del Pratomagno e del Chianti)
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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
Red fox (Vulpes vulpes) as wild reservoir of Opisthorchis felineus (Digenea: Opisthorchiidae) in Italy
No full textAIM. Opisthorchiasis by Opisthorchis felineus (Digenea: Opisthorchiidae) is gaining an increasing importance in Italy for the recent occurrence of several human cases due to the consumption of raw or undercooked/marinated tench (Tinca tinca), so far known as the more suitable second intermediate host of the parasite in Italian country. The "classic" life cycle involves the domestic cat (Felis catus) as definitive host assuming the infective stage (metacercaria) of O. felineus by the consumption of infected fish remains, a freshwater snail belonging to Bithynia genus as first intermediate host and cyprinid fish as second intermediate host. Man is a suitable definitive host, such as dog and other fish eating mammals. Recent surveys (Crotti D et al, 2007, G It Microbiol Med Odont Clin, 11: 20-23; De Liberato C et al, 2010, Vet Parasitol, 177: 67-71) have shown, in endemic areas of Central Italy, O. felineus eggs prevalence values in cat feces of 31.8%, 36.6% and 73.3% around Trasimeno, Bolsena and Bracciano Lakes respectively.
Although in European and former U.S.S.R. countries the occurrence of a life cycle of O. felineus linked to wild environment is reported (World Health Organization, 1995, Control of Foodborne Trematode Infection. WHO Technical Report Series: 125-126; Schuster R et al, 1999, Parasitol Res, 85: 142-146; Adams AM, 2006, in: Foodborne parasites, Ortega Ed, Springer Science, New York, USA), in Italy only two cases of opisthorchiasis in European polecat Mustela putorius in Pisa province, Tuscany, have been reported (Macchioni G, 1963, Ann Fac Med Vet Pisa, 16: 238-247), in the same area where O. felineus was reported for the first time by Rivolta in XIX century in cats and dogs (Rivolta S, 1884, G Anat Fisiol Patol Anim, 16: 20-28). With the aim of defining the possible role of wild mammals in O. felineus epidemiology in Italy, a parasitological survey has been undertaken on fecal samples collected from foxes in Tuscany.
MATERIALS AND METHODS. Five fecal fox samples collected during 2007 in the framework of a research project on epidemiology of Trichinellosis in red foxes of Tuscany (Magi M et al, 2008, Hystrix, 19: 31-38) in Cascina and Bientina areas in Pisa province and stored in 10% buffered formalin were subjected to coprological examination by sedimentation and flotation with zinc sulphate ZnSO4 (s.g. 1.350), searching for Opisthorchiid eggs. Microscopically positive fecal samples were subjected to DNA extraction with QIAamp DNA Stool Mini Kit (Qiagen) and to nested PCR, amplifying the ITS rRNA (Luton K et al, 1992, Mol Biochem Parasitol, 56: 323-328). The PCR product was sequenced in both direction by ABI 3730 DNA Analyzer at StarSEQ GmbH (Mainz, Germany).
RESULTS. One out of five fecal fox samples was positive for the presence of digenean eggs, showing measures and morphological features consistent with eggs of Opistorchiidae trematodes. The sequence obtained showed 100% identity with O. felineus.
CONCLUSIONS. The possible role played by red fox as wild reservoir of Opisthorchiasis in Italy needs further investigations, already undertaken by our research groups in different Italian regions. The presence of a "wild" life cycle in addition to the "classic" one linked to the cat as main reservoir could complicate the epidemiology and, as a consequence, the control of this parasitic zoonosis in Italy
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
Il tumulo eneolitico di Via Bruschi a Sesto Fiorentino
No full textIl tumulo di via Bruschi a Sesto Fiorentino rappresenta la prima evidenza funeraria in ambito locale, a fronte dei numerosi contesti insediativi. La struttura è chiaramente connessa alla diffusione dei gruppi del campaniforme in Italia centrale. L'A. propone una serie di confronti strutturali utili a mettere in luce le analogie con alcune aree europee, al fine di sottolineare le relazioni interregionali durante il III millennio a.C. tra Italia centrale e ambienti transalpini. Tali connessioni sono coerenti con quanto è evidenziato dalle analisi delle produzioni fittili
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