1,721,040 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Lo “spasmodico trionfo” di Elettra. La tragedia di Hugo von Hofmannsthal, in: “Incipit tragoedia” – “Incipit parodia”. Tragedia e parodia nella Wiener Moderne.
No full textIl contributo è dedicato alla tragedia Elettra (1903) di Hugo von Hofmannsthal, opera controversa sin dalle sue prime rappresentazioni, che continua a dividere la critica. È noto che nel tentativo di rinnovare la tragedia Hofmannsthal recepisce la visione dionisiaca e anticlassicista della Nascita della tragedia, ma probabilmente – questa la tesi – si ispira a Nietzsche anche per quanto riguarda il tipo e la modalità di ricerca del tragico, una ricerca proiettiva e creativa di sé, legata a processi di intima trasformazione che, come tale, mostra tutte le sue ambivalenze e aporie. Il dramma dello scrittore viennese rappresenta in questa prospettiva il tentativo di una rinascita della tragedia in epoca moderna, ma lo spasmodico trionfo della protagonista, espresso nella “danza senza nome” del finale, conclude un’opera problematica e sintomatica. La coreografa lasciva dell’Elettra di Hofmannsthal sembra partecipare alla cosiddetta “invenzione dell’“isteria” (Didi-Huberman), espressione della malattia di fine secolo; più che una parodia può essere considerata una ‘conversione’ della tragedia che porta alla luce la contaminazione del pathos tragico con la patologia che contraddistingue la modernita
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
“Incipit tragoedia” – “Incipit parodia”. Tragedia e parodia nella Wiener Moderne, a cura di Isolde Schiffermuller e Elisa Destro
No full textA seguito della crisi della formazione classica nel corso
dell’Ottocento, nell’area di lingua tedesca di fine secolo la
tradizione antica è tornata a essere per molti artisti e studiosi un’esperienza intellettuale e umana viva e arricchente, un interesse che ha posto con rinnovata urgenza la questione della modernità dell’antico e dell’antichità o, meglio, arcaicità del moderno. Un
ruolo centrale riveste in questo contesto la trasmissione del teatro antico nella cultura e letteratura della Klassische Moderne. Se il genere della tragedia viene considerato anacronistico verso la fine dell’Ottocento, il tragico è tuttavia presente nel dibattito teorico e culturale dell’epoca che contempla, insieme alla fine della tragedia
classica, la sua rinascita in forme diverse. Di particolare rilevanza
è in questo contesto non solo la ricezione del teatro in senso tradizionale, bensì il confronto creativo e originale degli scrittori con le fonti classiche, con la tragedia e la mitologia antica, nella forma di rielaborazioni, rifacimenti, riletture e riscritture della tradizione classica
Localization of gamma-glutamyl-transferase gene transcripts, protein and activity in plant tissues
No full textOne of the less well-known aspects of glutathione (GSH) metabolism is its degradation. Two pathways have been suggested: in one, the glycine residue is first removed by a carboxypeptidase, then cysteine is hydrolyzed by a -glutamyl cyclo-transferase; in another, glutathione degradation is initiated by gamma-glutamyl transferase/transpeptidase (GGT) activity. The latter is well described in mammals, where it is thought to have a key role in cell redox balance and glutathione salvage from the extracellular space, but it is little known in plants. Previous investigations on UV-B photo-oxidative stress conditions in maize leaves showed an increase in cys-gly content that reportedly results from glutathione degradation by means of GGT activity; this study presents the results of our investigations on this enzyme in plants.
As predicted by sequence analysis on known plant GGTs, there is a substantial similarity with GGTs from other organisms as concerns the presence of the amino acid residues needed for substrate binding and catalytic activity, glycosylation sites, the cleavage site and the putative transmembrane domain at the N terminus.
By means of an enzyme-histochemical procedure, we localized GGT activity in various tissues from different plant species. Our results show that GGT activity is mainly localized in the parenchymal cells of conductive tissues closely associated with vascular bundles, but also in the stomata and epidermal cells. In maize leaves, GGT transcript localization, as revealed by in situ hybridization, correlates with the distribution of GGT activity. Immunocytochemical analysis confirms the localization of GGT in the plasma membrane, but also reveals its presence within the cell walls.
The role of GGT in plant metabolism remains largely unknown. The histochemically-detected localization of GGT activity suggests that this enzyme may be involved in GSH redistribution in plant organs and tissues. GGT promotes the removal of a gamma-glutamyl moiety and the resulting cys-gly may either be degraded to its constituent amino acids and transported across the plasma membrane, or it may take part in redox signaling by influencing the redox state of free thiols of membrane proteins. It is therefore feasible to suggest that GGT fulfills important functions in addition to GSH degradation
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