1,721,006 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
Basic fibroblast growth factor in mesothelioma pleural effusions: correlation with patient survival and angiogenesis
No full textThe expression of angiogenic factors may represent useful markers for diagnosis and prediction of disease outcome. Basic fibroblast growth factor (b-FGF) is a potent angiogenic factor which promotes in vitro growth of endothelial cells and in vivo vessel formation. We investigated the expression of b-FGF in patients affected with malignant and non-malignant pleural diseases and presenting clinically with non-specific signs and symptoms. We also studied the relationships between the expression of b-FGF in patients with malignant pleural mesothelioma (MM) and tumour aggressiveness, assessed as tumour vessel density (TVD), or patient survival. Basic-FGF was measured by immunoassay in the serum and pleural effusions (PE) of 37 patients. Of these, MM was diagnosed in 15/37 patients while the remaining patients had either peripheral lung adenocarcinoma (PLA) or benign inflammatory pleural disease (BPD). The mean b-FGF level measured 8.5+/-6.1 pg/ml in the PE of the malignant group (MM + PLA) and 23.9+/-19.8 in the PE of the non-malignant group (BPD) (p=0.001). The mean b-FGF level was significantly lower in the PE of MM patients (6.9+/-5.2 pg/ml) compared to BPD patients (p=0.004). Linear regression analysis showed a significant inverse correlation (r=-0.59; p=0.041) between b-FGF levels found in MM PE and patient survival. A noteworthy relationship between high serum b-FGF levels and reduced survival was also observed (r=-0.57; p=0.052). Interestingly, both serum (r=0.48; p=0.114) and PE (r=0.26; p=0.413) b-FGF levels in MM patients correlated poorly with TVD. Our data indicate that b-FGF is significantly more expressed in non-malignant compared to malignant PE, this difference being particularly evident between MM and BPD. Our results also suggest that high b-FGF levels correlate with poor MM patient survival through mechanisms which may be independent of b-FGF angiogenic potential
Basic fibroblast growth factor in mesothelioma pleural effusions: correlation with patient survival and angiogenesis
No full textMethionine Aminopeptidase-2 regulates human mesothelioma cell survival: role on BCL-2 expression and telomerase activity
No full textVariations 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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