1,720,973 research outputs found
ABO blood groups and venous thromboembolism in a cohort of 65,402 hospitalized subjects.
No full textSeveral studies documented an association between thrombosis and ABO blood groups. In particular, non-O blood groups showed a higher risk of myocardial infarction, angina, peripheral vascular disease, cerebral ischemia, and venous thromboembolism (VTE) than O group. We sought to investigate, in a large sample of hospital admissions, the possible association between blood groups and VTE. The study was based on the discharge hospital sheets (DSOs) of patients admitted to the Hospital of Ferrara, region Emilia-Romagna (RER), Italy, 2000 and 2011. We selected all patients with first or second discharge ICD-9-CM diagnosis code of: acute pulmonary heart disease (APHD); pulmonary embolism (PE); phlebitis and thrombophlebitis (PVT); other venous embolism and thrombosis (OVET).Total population was divided into subgroups by gender, age, and presence of risk factors: arterial hypertension, diabetes, overweight-obesity, dyslipidemia, homocystinemia, coagulation defects, gout, and cancer. Moreover, we considered all patients in whom a blood group determination was recorded. There were 345,607 admissions, regarding 164,438 different patients. Of these, 65,402 had their blood group determination. Among these patients, 1,270 had a PE, 828 had a PVT, and 923 had an OVET. In the multivariate analysis, patients with non O blood group, and with A-allele, had a significantly higher risk for VTE (p=0.001) whereas the presence of group O appeared to be protective (p=0.001). This study shows an increased VTE risk in subjects with non O-groups genotypes, ranging from 20% to 35%. In the real world of everyday medical practice, the decision of whether to test for thrombophilia patients with VTE is controversial, due to organizational and economic constraints. Given the social utility of having one’s own blood group determination, and considering the prevalence of non-O blood groups, this could provide general practioners a valid, and relatively inexpensive, first-line tool to evaluate thrombophilic risk
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
Acquisition of spectral images of paintings by means of a spectrophotometric scanner
No full textThe settlement of archives of reference images useful for the diagnosis of the preservation state of paintings and restorer actions can be obtained using a spectrophotometric scanner capturing spectral images. This scanner is built arranging a spectrometer between the objective lens and a black and white digital matrix camera. The paper describes the working principles of the scanner, its technical properties, the fidelity of both the color acquisition
and reproduction, and the spatial resolution. Practical works carried out using the scanner are shortly presented
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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