1,720,965 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
Preferential nuclear accumulation of JAK2V617F in CD34+ but not in granulocytic, megakaryocytic or erythroid cells of patients with Philadelphia-negative myeloproliferative neoplasia.
No full textAdiponectin is involved in the control of human lung epithelial A549 cell viability
No full textAdiponectin (Acrp30) is an insulin-sensitizing fat hormone that
has enormous potential as a therapeutic target for obesity-related
diseases, including diabetes, atherosclerosis and cancer. More-
over, it displays anti-inflammatory actions and attenuates inflam-
matory responses in several tissues and cell cultures. It has been
reported elevated serum levels of Acrp30 in Chronic Obstructive
Pulmonary disease (COPD) patients but the role of the increased
levels are not yet clarified. Since COPD patients are characterized
by increased serum and sputum concentrations of several cyto-
kines (TNFa, IL-6, IL-1b), in this study we analyzed the effects
of Acrp30 treatment in A549 cells (human lung adenocarcinoma)
selected as a in vitro model of lung epithelia. Furthermore, we
investigated the role of Acrp30 at two concentrations (5 and
50 lg/ml) in A549 cells treated with TNFa. We performed a via-
bility assay (MTT test) and demonstrated that Acrp30 reduces
cell viability in a dose and time dependent manner; interestingly
in pre-treated cells with pro-inflammatory cytokine TNFa,
Acrp30 treatment (48 and 72 hours) is able to ameliorate the pro-
liferation rate. We found also that the reduction of cell viability
induced by Acrp30 is linked to the inhibition in ERK1/2 phos-
phorylation and that the beneficial effects induced in co-treat-
ment with cytokines is mediated by activation in ERK1/2
phosphorylation.
Our data show that Acrp30 could play a central role in the con-
trol of local lung inflammatory state and epithelial cell degenera-
tion in lung of COPD patients, thus Acrp30 may represent a
target for the development of new therapeutic approaches also in
inflammatory diseases as COPD, an increasing global health
proble
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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