1,721,391 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
Recombinant DRB sequences produced by mismatch repair of heteroduplexes during cloning in Escherichia coli
No full textRecombinant chimeric sequences originating from a mix of the sequences of two different alleles are frequently found after amplification and cloning in E.coli of the exon 2 of the Major Histocompatibility Complex (MHC) DRB genes. Several authors suggested that the recombinant molecules are due to in vitro recombination during PCR, nevertheless a clear experimental demonstration of this hypothesis is missing. In order to understand the mechanism producing the chimeric sequences, we set up a simple experiment based on the different restriction patterns of parental and recombinant sequences. Our data demonstrate that in the analysed case most of the recombinant variants are not produced by in vitro recombination during PCR, but are the result of the mismatch repair of heteroduplex molecules during cloning in E. coli. The high mutation rate in the -helix region of DRB expressed genes, both after cloning in E.coli and after the germ-line differentiation process of vertebrates, suggests that the observed mutations are the result of similar gene conversion processes, probably favoured by Chi-dependent micro-recombination event
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
Valutazione economica di un programma per la prevenzione delle infezioni delle vie urinarie da cateterismo vescicale in un contesto ospedaliero
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
Leadership e democrazia. Dalla democrazia plebiscitaria di Weber al plebiscitarismo populista
Full text linkLa relazione fra democrazia e leadership assume un ruolo centrale nel processo di riconfigurazione delle forme e degli attori della politica nella lunga, e non priva di contraddizioni, transizione dalla democrazia dei partiti e delle ideologie alla democrazia caratterizzata dai processi di personalizzazione della politica e della leadership di vertice (Cavalli 1992; Poguntke e Webb 2009; Karvonen 2010; Garzia 2014). La politica si è progressivamente destrutturata e la “progressiva separazione fra la sfera politica, culturale e occupazionale” ha determinato una trasformazione della politica delle identità, con il passaggio da identità sociali e cleavages riconoscibili a una de-differenziazione del conflitto rispetto al dato occupazionale e allo svilupparsi di conflitti ancorati alla dimensione centro-periferia e alla differenziazione dei modelli e degli stili di vita (Eisenstadt 2002, 135). Progressivamente la leadership ha assunto il ruolo di principale strumento di “ridefinizione del politico”, tanto da potersi richiamare l’affermazione weberiana per cui “la politica moderna è quella della leadership in azione” (Weber [1919] 2006, 9) in un contesto dove la democrazia si caratterizza per la dimensione plebiscitaria e disintermediata delle relazioni politiche. La centralità del tema della leadership nel processo democratico riflette prospettive diverse, nel rapporto tra legittimazione e potere, nella prospettiva di un “pregiudizio” nei confronti della leadership per l’eccessiva concentrazione di potere e le possibili derive da questo assunte, nel suo riconoscimento all’interno di una visione elitista del potere, e nel più generale tema della fiducia che il leader è capace di generare laddove si presentano processi di personalizzazione della politica e di concentrazione del potere in cariche monocratiche di vertice (Femia, Körösényi e Slomp 2009; Kane, Patapan e t’Hart 2009; Kane e Patapan 2012; Foley 2013)
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