1,721,132 research outputs found
Due maestri a colloquio. Giuseppe Lombardo Radice e Angelo Patri
No full textFrutto di un sistematico lavoro di ricerca tra Italia e Stati Uniti, il volume approfondisce il rapporto professionale e intellettuale nato tra Giuseppe Lombardo Radice e Angelo Patri alla fine degli anni Venti del Novecento e ne ricostruisce il profilo esistenziale e scientifico
Brush citology: a reliable method in detecting helicobacter pylori infection
No full textBackground. In the last few years heficobacter pylori (HP) has been increasingly recognized as main etiologic factor of gastris and peptic ulcer, therefore modifying the diagnostic and therapeutic approach to these diseases. New less invasive diagnostic techniques have been developing to make a correct diagnosis and evaluate the effectiveness of medical treatment.
Objective. The goal of this study was to assess the usefulness of brush cytology and compare its diagnostic accuracy with urease test in detecting HP in patients suffering from gastric or peptic ulcer.
Patients. The study group consisted of 213 consecutive patients who underwent elective gastroduodenoscopy. Twenty-six (10%) patients had duodenal ulcer, 27 (34%) chronic gastritis and the remaining 115 (56%) had duodenal ulcer but were on treatment with omeprazole (75 patients) or ranitidine (40 patients).
Methods. At endoscopy accurate brushing was obtained prior to biopsy. Cytology material was smeared and methilene blue-stained sections were then prepared for light microscopy. Biopsies obtained were treated for the ureasc test. Results of both methods were available within one hour.
Results. Brush cytology was more sensible than urease test in detecting HP in patients with either chronic gastritis (55% vs 36%) or duodenal ulcer after omeprazole treatment (75% vs 51%). In the remaining patients with duodenal ulcer with no concomitant medication or ranitidine therapy. Brushing has accuracy equal to that of urease test in identifying HP (i.e.94% vs 84%).
Conclusions. Brush citology is a simple, reliable, relatively non-invasive and inexpensive method in detecting HP in persons with gastritis or peptic ulcer. This technique is more sensible than the urease test for assessing HP colonization when gastric density is low (i.e. after omeprazole therapy or in chronic gastritis)
La metafora solare nella concezione neoplatonica del Principio
No full textLo scopo dello studio è quello di prendere in esame come gli autori neoplatonici, Plotino, Proclo e Damascio, interpretano la funzione ed il significato della metafora solare contenuta e delineata nel VI libro della Repubblica di Platone
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
La metafora solare nella concezione neoplatonica del Principio
No full textLo scopo dello studio è quello di prendere in esame come gli autori neoplatonici, Plotino, Proclo e Damascio, interpretano la funzione ed il significato della metafora solare contenuta e delineata nel VI libro della Repubblica di Platone
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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