1,721,016 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
Cittadinanza, identità e diritto alla differenza. Quanta ‘cittadinanza’ possiamo dare alla differenza?
No full textIn questo contributo adotto una prospettiva sociologico-giuridica orientata alla teoria costituzionalista del diritto per trattare dell’identità e della differenza delle persone che sono cittadini di una società pluralista retta da un sistema politico democratico-costituzionale. La questione più ampia che viene affrontata è quella dell’integrazione di questo tipo di società mediante il riconoscimento dei suoi membri come cittadini di pieno diritto. Il concetto di ‘cittadinanza’ appare come medium di relazioni tra identità e differenza e rinvia a due distinti significati. Il primo è quello tradizionale, per cui la cittadinanza è simbolo di omogenea appartenenza politico-culturale alla nazione; il secondo è quello che la cittadinanza assume in un contesto politico e sociale pluralista, in cui essa si collega ad una collettività di cittadini, accomunati principalmente (solo) dalla titolarità di diritti e doveri peculiari del loro status. In questa seconda versione, la cittadinanza può essere veicolo di inclusione di cittadini differenti. Qui la cittadinanza rimane estranea a, ma garante de, l’identità individuale e ciò nonostante è veicolo del riconoscimento della dignità della persona/cittadino. Poiché alla persona viene riconosciuto costituzionalmente il diritto alla differenza, bisogna vedere fino a punto può essere garantita la sua diversità
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
Periplasmic competition for zinc uptake between the metallochaperone ZnuA and Cu,Zn superoxide dismutase
No full textWe have investigated the availability of zinc in the periplasmic space of Escherichia coli using a mutant Cu,Zn superoxide dismutase whose dimerization is triggered by zinc binding. This mutant enzyme accumulates in the monomeric form when wild type cells are grown in minimal medium, but assembles in the dimeric form when it is produced in the same medium by a mutant strain lacking the periplasmic zinc metallochaperone ZnuA. These results indicate that periplasmic zinc-containing proteins compete for metal binding when bacteria grow in environments where this element is present in traces. The effective ZnuA ability to sequester the available zinc ions from the periplasm suggests that zinc-containing cytoplasmic proteins are more important for bacterial viability than the periplasmic ones
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