1,720,959 research outputs found
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
Clinically amyopathic dermatomyositis: case report and review of the literature
No full textClinically amyopathic dermatomyositis (CADM) is an autoimmune disease characterized by the presence of skin lesions typical of dermatomyositis and absent/low muscle involvement. One case of hypomyopathic dermatomyositis with early rapidly progressive interstitial lung disease in a 52-year old woman with fever, erythematous desquamating skin rash, arthralgia and pulmonary consolidation is here reported. The rapid progressive interstitial lung disease caused the patient‘s death, despite immunosuppressive treatmen
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
HLA alleles and susceptibility to osteoporosis in men
No full textBackground: Osteoporosis (OP) is a disease of the skeleton characterized by compromised bone strength leading to an increased risk of fracture. The disease predominantly affects women because of the important pathogenic role played by gonadal steroid, however in recent decades has been demonstrated the increased prevalence of OP in men. Osteoporosis is a multifactorial disease strongly influenced by genetics factors. Studiesof twins and families with OP show that the genetic contribution to the pathogenesis of OP is responsible for 50-80% of the interindividual variability in bone mineral density (BMD).
Among the susceptibility genes involved a role could be played by the HLA polymorphism. Some studies of women report an increase in HLA-B7allele in osteoporotic patients compared with controls; in particular the increaseof HLA-B7 is linked to HLA A24-B7-DR1 and HLA B7-DR15-DQ6 haplotypes.
Objectives: Typing for HLA I and II genes in49 men and 81 women with OP and in 107 healthy control individuals and assess any differences in allele distribution among the three groups, in order to identify possible susceptibility genes in osteoporotic men.
Methods: We selected 49 men with osteoporosis, 18 belonging to primary osteoporosis and 31 to secondary
osteoporosis due to inflammatory rheumatic diseases; a group of 107 healthy control and a group of 81 women (41 with prymary OP and 40 with secondary OP) were also studied.
To analyze the statistical dependence of variables in different groups we used the χ2 test with one degree of freedom, or Fisher’s exact test when necessary.
Results: We observed no differences among the three groups in the frequencies of alleles of loci HLA-DRB and HLADQB. Nevertheless, valuating HLA Class I loci we observed a significant increasein the frequency of HLA-B16 in the group of males compared to controls (16% vs 6%) Pc 0,03) and in respect to the women group.(16% vs 8% Pc 0,02).
Conclusions: The study of the distribution of HLA alleles in males shows an increased frequency of HLA-B16, never described in other studies. However hasn’t been demonstrated the increased frequency of HLA-B7 previously found in women with OP. The association of HLA-B7 with the OP in women, confirmed by several studies, allows us to hypothesize that this allele may be a marker of susceptibility to OP. HLA-B16 could play the same role in the male population of OP; however, being an original data, obtained on a relatively small sample, it needs to be confirmed on larger series and further studies
Cutaneous manifestations in antiphospholipid syndrome
No full textAntiphospholipid syndrome (APS) is a hypercoagulable state that leads to thrombosis and recurrent pregnancy loss related to the presence of antiphospholipid antibodies (LAC, anticardiolipin, antiA2-glycoprotein). Among cutaneous manifestations, livedo reticularis is the most frequent form of APS. In the literature, there are rare cases associated with diffuse skin necrosis (widespread skin necrosis) and intravascular thrombosis in the small vessels of the dermis. We describe the case of a 44-year-old man with positive anticardiolipin antibodies and protein S deficiency that developed scattered, bullous skin lesions, haemorrhagic in appearance with signs of necrosis as first clinical manifestation of antiphospholipid syndrome
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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