1,720,993 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
Estratti di Chelidonium majus e loro impieghi per il trattamento di disfunzioni cutanee e per la rigenerazione della pelle.
No full textAppropriate 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
N-(9-Benzyl-2-phenyl-9H-8azapurin-6-yl)-amides: A new class of A1 adenosine receptor ligands
No full textBerberine exposure triggers developmental effects on planarian regeneration
No full textThe mechanisms of action underlying the pharmacological properties of the natural alkaloid berberine still
need investigation. Planarian regeneration is instrumental in deciphering developmental responses
following drug exposure. Here we report the effects of berberine on regeneration in the planarian Dugesia
japonica. Our findings demonstrate that this compound perturbs the regenerative pattern. By real-time
PCR screening for the effects of berberine exposure on gene expression, we identified alterations in the
transcriptional profile of genes representative of different tissues, as well as of genes involved in extracellular
matrix (ECM) remodeling. Although berberine does not influence cell proliferation/apoptosis, our
experiments prove that this compound causes abnormal regeneration of the planarian visual system.
Potential berberine-induced cytotoxic effects were noticed in the intestine. Although we were unable to
detect abnormalities in other structures, our findings, sustained by RNAi-based investigations, support the
possibility that berberine effects are critically linked to anomalous ECM remodeling in treated planarians
Effects of protoberberine and benzophenanthridine Alkaloids on human skin fibroblast proliferation
No full textEstratto di Helichrysum in olio o cera di Jojoba e composizioni a base di tale estratto, in particolare, per trattare condizioni della pelle.
No full textComposizione comprendente un estrato di Chelidonium majus e Copaiba e il suo impiego per il trattamento di disfunzioni cutanee.
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