1,721,007 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
H2O2 oxidative activity: modulatory effect of hydroxytyrosol
No full textHydroxytyrosol (HT) is the major o-diphenol present in extra-virgin
olive oil, either in free or esterified form, once absorbed, is present in
high amount in the kidney, where it may exert a proctetive action. In this
study we monitored the ability of HT to protect renal cells (LLC-PK1)
against oxidative damage induced by H2O2. The peroxidation of lipid represents
a primary consequences of cellular oxidative stress, leading to
biophysical changes that disrupt membrane and organelle function; moreover
oxidative stress is a process that may stimulate cellular signalling
pathways, usually associated with the promotion of cellular death. HT
exerted a significant antioxidant action, inhibiting the production of
fatty acids hydroperoxides and 7-ketocholesterol induced by H2O2 treatment
and thus preserving the membrane lipids. It has been shown that
oxidative stress in LLC-PK1 cells is related also to the changes in the
phosphorylation state of pro-death signalling pathways ERK1/2 and the
pro-survival signalling Akt/PKB. Pretreatment with HT is able to modulate
H2O2-induced changes in the phosphorylation state of ERK1/2
and Akt/PKB. We suggest that one potential protective mechanism of
olive oil polyphenols in kidney cells may be attributed to interactions
with intracellular signalling pathways activated in response to oxidative
stress
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
Protective effect of arzanol, a prenylated pyrone-phloroglucinol etherodimer, in several models of oxidative stress
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Effetto protettivo di acilfloroglucinoli oligomerici del mirto nei confronti del colesterolo
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