1,720,980 research outputs found
A rare case of multiple congenital epulis
No full textWe report a case in a female newborn infant of multiple congenital epulis, i.e. granular cell tumor, that was undetected during regular pregnancy ultrasound monitoring. At birth the neoplasms appeared as two voluminous lesions protruding from the newborn's mouth. The greater of them (5.5 cm × 4 cm × 3 cm) was pedunculated and attached to the external superior gingiva, shifting the alae nasi and making it difficult to enter the coanae. The second mass was somewhat smaller (3 cm × 4 cm × 2.5 cm), pedunculated and attached to the external inferior gum. A third smaller mass was less evident, unpedunculated and attached to the rim of the lower gingiva. Histologically the lesions were characterized by large cells, which had abundant pale acidophilic granular cytoplasm. A round-oval nucleus was located centrally. The cell membranes were distinct. Neither mitosis nor necrosis was found. Staining for cytoplasmic granules was intensely periodic acid-Schiff (PAS) positive and diastase resistant, lmmunohistochemical negativity for SlOO protein, positivity for lysozyme and numerous phagolysosomes in the cytoplasm of neoplastic elements, observed on ultrastructural examination, supported the hypothesis that the congenital type of granular cell tumor cannot have a Schwannian origin like that of the adult type, but is probably a mesenchymal lesion which, for unknown cause, regresses by a degenerative process
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
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
A case of medullary sponge kidney (Cacchi-Ricci disease) mimicking a renal mass
No full textMedullary sponge kidney (MSK) is an uncommon benign congenital disorder, generally asymptomatic. In symptomatic patients the diagnosis is usually made by excretory urography performed in the most frequent complications such as renal stones, urinary tract infections and haematuria. Excretory urography can be very characteristic, showing cystic collections of ectatic collecting ducts like "bunches of grapes" or "bouquet of flowers". When haematuria represents the only symptom, and radiographic findings are not characteristic of MSK, the differential diagnosis with a renal tumor can be very difficult. We report a case of MSK that underwent nephrectomy since clinical and radiological features mimicked a renal tumor
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