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RIGENERAZIONE MUSCOLARE NEL RATTO DOPO ABLAZIONE CHIRURGICA DEL MUSCOLO RETTO DELL'ADDOME
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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
In vitro reconstruction of a microcapillary network into a tissue-engineered human dermal equivalent
No full textExperience coming from many cell culture studies has opened new perspectives: the hypothesis that tissue and organ reconstruction should be performed in a three-dimensional environment as it normally occurs in vivo, is now not so far off. The base of every study is that all in vitro tissue substitutes need an important neoangiogenesis to be successfully transplanted. As far as endothelial cell culture is concerned, it has been shown that angiogenesis can be successfully achieved only when cells are cultured in the presence of collagen-based matrices or basal membrane substrates. The aim of the present investigation was to demonstrate that human umbilical vein endothelial cells (HUVEC) can be grown and differentiated on an artificial dermis obtained by human fibroblasts cultured on hyaluronic acid-based scaffolds. For this purpose we have cultured HUVEC, retrieved by collagenase digestion of perfused human umbilical veins either alone or with fibroblast at a 1/1 ratio into HYAFF-11. The product is an uncross-linked linear polymer with an undetermined molecular weight, insoluble in aqueous solution yet spontaneously hydrolyzes over time, releasing benzyl alcohol and hyaluronan. HYAFF-11 was used to create non-woven meshes. Cultures were maintained for up to three weeks. Samples were taken at different time-points within this period for the MTT proliferation test and for immunohistochemical analysis. One-way analysis of variance (Anova test) of the software package Excel was used for data analyses. Repeat measurement analysis of variance and paired t-tests were used to determine if there were significant changes (p < 0.05). Repeatability was calculated as the standard deviation of the difference between measurements of the MTT test performed. The proliferation rate of HUVEC cultured alone and co-cultured with fibroblasts was compared. Our results demonstrate that hyaluronan-based biomaterials (HYAFF-11 NW mesh) represent a suitable substrate for HUVEC adhesion, proliferation and reorganization in the microcapillary network
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
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