1,720,974 research outputs found
Syphilitic aortitis and its complications in the modern era
No full textINTRODUCTION: Aortitis is a well-recognized manifestation of the tertiary stage of syphilis.EVIDENCE ACQUISITION: Although often regarded as an unexpected diagnosis, actually new cases of cardiovascular syphilis continue to be reported. Presumably, Treponema pallidum invades the aortic wall and the inflammatory response progresses towards obliterative endarteritis and necrosis of the muscular and elastic fibers in the aortic media. The consequent weakening of the aortic wall can lead to severe complications, represented by aortic aneurysm, aortic valvular insufficiency, aortic root dilation and coronary ostial stenosis. We perused the literature of the last 6 years to assess the prevalence and possible changes over time of syphilis cardiovascular manifestations.EVIDENCE SYNTHESIS: Forty four articles were collected, reporting on 66 patients. Many patients presented more than one complication. Aortic aneurysm was the most frequent involvement, detected in 71% of patients. Fusiform or saccular aneurysms often interested the thoracic aorta, primarily located on the ascending segment. The second most common complication was the aortic valvular insufficiency, found in 47% of patients. Coronary ostial stenosis and dilation of the aortic root were less frequent.CONCLUSIONS: Comparing our study with the previous ones, the cardiovascular involvement appeared roughly constant over time. Although many articles fail to provide useful information, such as a detailed history and the presence of risk factors, we must note that most patients had no predisposing factors and denied a primary infection. Cardiovascular syphilis is still present nowadays and it is important not to forget the "great imitator" in the event of its characteristic symptoms
Is the Standard Treatment for Early Syphilis Sufficient to Prevent Cardiovascular and Neurologic Syphilis?
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Urticaria associated with Epstein-Barr virus reactivation. Cutaneous manifestations of Epstein-Barr virus
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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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