1,721,120 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
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
A 13C NMR investigation of stereochemical non rigidity in hydrido olefinic carbonyl clusters of ruthenium
No full textHistological study of premortem, perimortem or postmortem skin lesions typical of a cruel method of homicide (accaprettamento) practiced by the mafia
No full textSynthesis and spectroscopic characterization of heterobimetallic (α-alkynyl)iron-cobalt hexacarbonyl complexes, μ-(1-σ, 2-3, η2-R2C-CCR′)][(CO)3Fe-Co(CO)3] and [μ-(1-σ, 2-3, η2-H2C-CCCH2OH)] [(CO)3Fe-Co(CO)2(PPh3)]
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Endothelial progenitor cells express PAF receptor and respond to PAF via Ca(2+)-dependent signaling
No full textEndothelial progenitor cell (EPC) therapy is a promising approach to promote angiogenesis and endothelial repair in patients with cardiovascular diseases (CVD). However, their release of roinflammatory mediators may compromise the therapeutic efficacy. Little is known about the role of Platelet-Activating Factor (PAF) in
EPC functional response. Here, we investigated the expression of PAF receptor (PAF-R) in early EPC and the release of PAF under stimulation with factors involved in endothelial dysfunction. Results indicated that early EPC express the PAF-R and respond to PAF signaling via a transient increase of cytoplasmic Ca2+ concentration. EPC release PAF in a time dependent manner upon stimulation with tumor necrosis factor-? (TNF-?) or high-glucose concentration with a peak at 30 min and 10 min (pb0.01 vs. control), respectively.
PAF, starting at concentration of 50 ng/ml, exerted a detrimental effect on EPC number with a concomitant increase of p38 activity. Furthermore, both the reduction of early EPC number and the enhanced p38 activity induced by PAF were abolished by CV3988, a PAF receptor antagonist. These novel findings, revealing that early EPC respond to PAF signaling, unveil an inflammatory pathway that may play a crucial role in the outcome of cardiovascular cell therapy with EPC
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