1,720,962 research outputs found
Effects of the chronic digoxin administration on extracellular matrix turn-over in a model of cardiac hypertrophy in guinea pig
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Antibacterial treatment on titanium: surface analysis and in vitro biological evaluation
No full textMateriali per la ricostruzione dentale: studio della citotossicità su fibroblasti gengivali.
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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
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
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
In vitro interaction of human fibroblasts and platelets with a shape-memory polyurethane
No full textPhysicochemical and mechanical properties, in
vitro cytotoxicity, cytocompatibility, and platelet adhesion
were investigated on a shape-memory polyether-based
polyurethane (MM-5520 SMPu) using the polyether-based
Pellethane 2363-80AE (Pell-2363 SPU) as reference. MM-
5520 SMPu and Pell-2363 SPU showed similar average molecular
weights and different surface properties, with a
higher hydrophilicity and roughness for the SMPu. By tensile
tests and dynamic mechanical analysis, the peculiar
characteristics of the MM-5520 SMPu were evidenced:
strong temperature-dependent behavior for SMPu compared
with SPU, and a high shape recovery. MM-5520 SMPu
did not show any cytotoxic effect on the adhesion and
proliferation of human skin fibroblasts and gingival fibroblasts,
and a good cytocompatibility was observed with both
cell types, as demonstrated by cell counting and scanning
electron microscopy observations. SMPu compared with
SPU showed higher adsorption of extracellular matrix proteins
such as fibronectin, fibrinogen, and collagens. Proteins
adsorbed onto SMPu significantly enhanced the adhesion
and proliferation of human fibroblasts. The interaction of
SMPu with platelets was studied with platelet rich plasma.
Fewer platelets adhered to the SMPu, with minor morphological
variations than onto the SPU. The cytocompatibility
and hemocompatibility of MM-5520 SMPu combined with
its unique properties such as change in shape or in stiffness,
depending on practical requirements, make this shapememory
material potentially advantageous for biomedical
applications
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