1,721,069 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
Tempi medi di percorrenza in diversi ambienti indoor ed outdoor: risultati di una indagine su un campione di 101 milanesi
No full textColonic adenolipoma with lipoblast-like cells
No full textAdenolipomas are benign lesions characterised by an admixture of varying proportions of mature adipose tissue with normal glands. Only rare cases have been histologically documented in the breast (1), thyroid gland (2), parathyroid (3) and salivary gland (4). Recently Kunimura et al (5) described an adenolipoma of the colon. We report an additional case of adenolipoma of the colon in which the lipomatous component is characterised both by mature fat cells and by lipoblast-like cells.A 79 years old woman, treated for a colonic carcinoma in 1998, was found to have two polypoid lesions in the sigmoid colon. Endoscopically both lesions were peduncolated and reddish in colour and measured 6 and 10 mm, respectively, of greatest axis. They were resected and routinely processed for histological examination. At histology the smaller lesion was a tubular adenoma with mild dysplasia while the bigger one was characterised by the presence of tubular glands with focal mild dysplasia admixed with adipose tissue (Fig.1A), consistent with a diagnosis of adenolipoma. The adipose tissue was localised in the lamina propria in close relationship with the glands (Fig.1B) and was constituted mainly by mature fat cells and focally by lipoblast-like cells with the nucleus indented by multiple vacuoles (Fig.1C). The lipoblast-like cells were located at the periphery of an area with a reduction of glands and granulation tissue. Anti-S100 protein antibody stained both mature fat cells and lipoblast-like cells.Submucosal lipomas are not uncommon in the gastrointestinal tract, especially in the large bowel, and also rare cases of lipomatous polyposis have been described. However, in usual lipomas the glands are peripherally displaced by the adipose component and not intermingled with it. To the best of our knowledge, only a single case of adenolipoma of the colon has been previously reported (5). This was the case of a 50 years old man with a 11 mm polypoid lesion of the descending colon constituted by atypical tubular glands admixed with intramucosal mature fat cells. We report an additional case of adenolipoma of the colon characterised by mature fat cells and lipoblast-like cells. The latter were seen at the periphery of an area which probably underwent ulceration, thus they may represent a reactive change. This hypothesis was further supported by the clinical and endoscopic findings which ruled out any soft tissue tumour. Lipoblast-like cells have never been reported in adenolipomas of any site, nevertheless it has been suggested that brown fat cells of adenohibernoma might cause problems in the differential diagnosis with true lipoblasts (6).Adenolipomas of the colon are rare lesions, probably representing an analogue of adenolipoma of other organs, which can show reactive changes of their lipomatous component –i.e. lipoblast-like cells. Pathologists should be aware of this to avoid misdiagnosis of malignancy
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
Smooth muscle cell differentiation in mammary stromo-epithelial lesions with evidence of a dual origin: stromal myofibroblasts and myoepithelial cells
No full textAims: We investigated the origin of myoid cells in benign stromo-epithelial lesions of the breast in order to ascertain their myoepithelial or myofibroblastic origin. Methods and results: We selected 22 stromo-epithelial lesions of the breast and reviewed their morphological features at haematoxylin-eosin (H&E) level. The lesions were classified as fibrous stromo-epithelial lesions (without evidence of myoid differentiation at H&E level) (13 cases), type 1 myoid stromo-epithelial lesions (myoid cells directly merging with the myoepithelial layer) (three cases), type 2 myoid stromo-epithelial lesions (bundles of myoid cells unrelated to the glands) (six cases). All cases were studied immunohistochemically and myoid stromo-epithelial lesions were also studied with electron microscopy. The myoid component in two out of three cases of type 1 myoid lesions showed immunohistochemically co-expression of smooth muscle and myoepithelial markers. In contrast, the remainder showed immunohistochemical results identical to those found in type 2 myoid lesions (positivity with SMA, desmin, calponin, CD34 and bcl2 and negativity with cytokeratin 14 and p63). Ultrastructural study confirmed the presence of cells with myoepithelial features in type 1 myoid lesions and of cells with myofibroblastic features in type 2 myoid lesions. Conclusions: Myoid cell differentiation is common in stromo-epithelial lesions of the breast, and is evident in H&E sections in up to 40% of cases. In addition, the origin of myoid cells is myofibroblastic in most cases, but in some cases, cells present immunohistochemical and ultrastructural evidence of myoepithelial origin
Studio delle variazioni giornaliere della pressione arteriosa. Valutazioni statistiche di una ricerca policentrica sul monitoraggio ambulatoriale in soggetti normali.
No full textSulla distibuzione,sul significato fisiopatologico e sulle implicazioni cliniche dei parametri caratterizzanti la dinaamica della pressione arteriosa rilevata per 24 ore con tecnihe incruente.
No full textCorrispondenze segrete : Il cinema e l'arte dei folli
No full textAll'interno della dialettica fra follia e creatività, intesa come dentro/fuori dell'umano, del linguaggio, delle categorie di pensiero, il saggio esplora il possibile rapporto fra il pittore outsider Pietro Ghizzardi e il cinema di Federico Fellini. Prendendo le mosse dalle teorie del rapporto fra arte e patologia nervosa (Prinzhorn), il saggio analizza l'immaginario femminile felliniano nei suoi aspetti 'patologici', riconducendo le sue caricature alle deformazioni del corpo tipiche dell'arte irregolare
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