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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
Colture primarie di colonociti umani: un modello per lo studio del metabolismo e della proliferazione dell'epitelio colico
No full textHuman colonocytes in primary culture: a model to study epithelial growth, metabolism and differentiation. Int. J. Colorect. Dis. 1994;9:13-22
No full textThe purpose of this work was to set up an in vitro model for the study of normal
and pathological functions of the colonic epithelium. We have isolated colonic
crypts by mild proteolytic digestion and mechanical dissociation of human biopsy
material obtained during colonoscopy. The crypts, free of connective tissue, when
placed in culture rapidly attached to the substrate and formed colonies
containing over 95% of epithelial cells. Histochemical and ultrastructural
characterization of the colonies showed the presence of both absorptive and
secretory cells, exhibiting a high degree of differentiation. Proliferative
activity occurred mostly during the first 24 h and progressively declined
thereafter. The cells survived and maintained differentiated characteristics for
at least three days in culture. This method can be used to study normal functions
of the colonic epithelium. It may also be employed to investigate both noxious
and protective factors in pathological conditions such as inflammatory bowel
disease and colorectal neoplasia
Primary cultures of human in colonocytes as a model to study the regulation of mucosal growth and differentiation
No full textColture primarie di colonociti umani: un modello per lo studio del metabolismo e della proliferazione dell'epitelio colico. Atti della V Settimana Italiana delle Malattie Digestive (SIMAD), Bologna 31 Maggio – 4 Giugno 1992, L. Barbara, R. Corinaldesi, M. Miglioli, E. Pisi, E. Roda Eds, Bologna,Monduzzi Editore, 1992:p. 217-222
No full textPrimary cultures of human colonocytes. A model for studies of epithelial growth and metabolism.
No full textVariations 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
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
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