1,720,960 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
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
Molecular Methods in Periodontal Infections
No full textThe aim of this work is to outline the criteria for the
determination of periodontal bacterial species. The
difficulties, the aims and the eveluation criteria to obtain a
valid microbiological examination of the sub-gingival sites
are analyzed. The advantages that the most advanced
techniques of molecular biology ( PCR, PCR real-time ) can
offer to the lab diagnosis of periodontal infections are
illustrated.
These methods are currently in use at the Oral
Biotechnologies Laboratory (OBL) of Cagliari
Adesione batterica nei materiali di sutura utilizzati in odontoiatria: valutazione mediante metodi molecolari
No full textAim of the work. Bacteria adhesion on both silk and nylon suture has been
evaluated in vivo by using molecular biology approach.
Materials and methods. Two silk and two nylon stitches were removed on 11
patients 10 days after oral surgery treatment and sent straight to the laboratory for
a PCR real time assay. Bacterial load on each sample was then quantified through
16S rRNA gene analysis.
Results and conclusion. The highest number of bacteria was detected on the silk
suture as the Nylon suture bacterial load was 4.5 times lower than the silk one.
Although the silk is still the most used suture material in oral surgery this paper
shows how high its bacterial load is when it is in place. It also suggests to avoid
using the silk on those patients who have either any immunity system disorders or
immuno-suppression treatment in progress, and those who cannot look after
properly at their own oral hygiene because of mental illness or physical handicap
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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