1,721,072 research outputs found
Hypertrophic verrucous lesions after monkeypox virus infection
No full textHypertrophic verrucous lesions after monkeypox virus infectio
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
COVID-19: how it can look on the skin. Clinical and pathological features in 20 COVID-19 patients observed in Bologna, north-eastern Italy
No full textEvaluation of BD ProbeTecTM CT/GC Qx DNA Amplified assay for the molecular detection of Chlamydia trachomatis and Neisseria gonorrhoeae infections
No full textBackground: Chlamydia trachomatis (CT) and Neisseria gonorroheae (NG) represent the most common agents of bacterial sexually transmitted infections (STIs), worldwide. Recently, nucleic acid amplification techniques (NAATs) have become the reference methods for CT/NG infection diagnosis, thanks to the excellent sensitivity and specificity. Moreover, the use of multiplex tests allows the detection of both pathogens from the same sample, leading to a more simplified syndromic management.
The aim of this study was to assess the performance of BD ProbeTec CT/GC Qx DNA Amplified assay for CT and NG detection, by a comparison with another commercial NAAT.
Materials/methods: From January 2017, a total of 352 consecutive uro-genital samples, submitted to the Microbiology Unit of S. Orsola-Malpighi Hospital in Bologna (Italy) for CT and NG detection, were selected. In particular, 26 swabs and 141 urines were collected from subjects attending different clinics in the Bologna city area, while 120 urines and 65 swabs from patients attending the STI Outpatients Clinic of the Hospital. All the samples were tested with a multiplex real-time PCR (Versant CT/GC DNA 1.0 Assay; Siemens), currently used in the diagnostic routine. Subsequently, all the specimens were tested also with the BD ProbeTec CT/GC Qx DNA Amplified assay run on BD Viper LT platform. Both the methods are characterized by highly automated systems for nucleic acids extraction and target detection. Results: When compared, the two methods showed excellent concordance values. In particular, a concordance of 98.4% and 98.8% was found for CT detection on urine samples and genital swabs,with Cohen k of 0.86 and 0.94, respectively. For NG infection, a 100%-concordance was found on urines and a 98.9% of concordance for the genital swabs, with Cohen k of 1 and 0.85, respectively. NG infection prevalence ranged from the 4% in the population attending the STI Clinic of the Hospital, to the 0.8% in the general population. CT infection prevalence reached the 9.1% in the high-risk
subjects, being 2.4% in the general population.
Conclusions: The BD assay and the Vyper system can represent an excellent choice for the molecular detection of CT and NG infection
Culture-free genotyping of Neisseria gonorrhoeae from urogenital samples in a high-density urban area in the North of Italy
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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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