1,720,963 research outputs found
Befunololo : indagine clinica sull’ efficacia e la tollerabilità di un beta - bloccante.
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Progressive replacement of oral mucosa by conjunctiva in osteo-odonto-keratoprosthesis:preliminary observations
No full textAbstract
PURPOSE:
In a Strampelli osteo-odonto-keratoprosthesis, a patch of oral mucosa is frequently used to cover the ocular surface after implantation of an osteodental lamina into the eye. In many cases, gross modifications in the eye covering become apparent a few years later. The aim of this study was to investigate the histologic findings in the clinically modified ocular surface.
METHOD:
Biopsies were performed in 7 patients at the junction between the osteodental acrylic lamina and surrounding modified oral mucosa, during surgery for local plastic reconstruction or positioning of antiglaucoma silicone tubes. Specimens were examined by light microscopy.
RESULTS:
Six of the 7 clinically modified specimens corresponded microscopically to conjunctiva. Typical oral mucosa could still be observed overlying the osteodental acrylic lamina.
CONCLUSIONS:
The production of local regulatory factors is a possible explanation for the survival of oral mucosa over the osteodental acrylic lamina, whereas their absence in distant areas may have induced the oral mucosa to transdifferentiate into a conjunctival-type lining. Alternatively, conjunctival regrowth from forniceal stem cells should be taken into consideration
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
Palaeoproteomic characterization of archaeological dental calculus reveals precarious periodontal health in pre-Roman Italy (7th–4th century BCE)
No full text: Periodontitis, a chronic inflammatory disease affecting the tooth-supporting structures, is a key indicator of oral health in palaeopathology. While poor oral hygiene, systemic diseases, and genetics are well-established contributors, the dietary impact has often been underestimated. Clinical studies, however, link diets high in fermentable carbohydrates and meat to inflammation. We investigated periodontal disease by analyzing interdental septa in 63 individuals from elite and non-elite groups in pre-Roman Italy (7th-4th centuries BCE), a period of social stratification, intensified agriculture, and increased cereal consumption. Macroscopic analysis was combined with proteomics of dental calculus from 33 individuals. Of the 1890 septa considered, 23 % displayed signs of periodontitis, with significantly higher rates in males. Prevalence increased with age in both sexes. Proteomic findings identified Porphyromonas gingivalis, a key periodontal pathogen, in 10 of 19 well-preserved dental calculus samples. While plaque accumulation is the main trigger for periodontitis, our findings highlight the dietary role in disease susceptibility. Carbohydrate-rich foods adhere to teeth and nourish bacteria, worsening periodontal conditions. At the same time, greater access to animal protein, particularly among emerging elites, may have contributed to inflammation. We propose that a proinflammatory diet may have been a major contributor to the proliferation of pathogenic oral microbiota
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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