1,721,163 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
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
Ovarian carcinoma presenting with axillary lymph node metastasis: a case report
No full textOvarian cancer is usually limited to the abdomen and frequently remains confined. The occurrence of extrabdominal mestastases is unusual. In this report we describe a rare case of axillary involvement at initial presentation of ovarian cancer in a 48-year-old woman. The axillary mass was the only clinical abnormality. Cytological and histological findings, performed on axillary lymph nodes, showed the presence of psammoma bodies and specific immunohistochemical tumor markers (OC-125 and WTI), supporting the evidence of a metastatic axillary lymphadenopathy from ovarian cancer. Subsequently, chest and abdominopelvic computed tomography showed a right ovarian complex mass of 30 x 25 mm and biochemical tests showed high levels of CA 125. Surgical therapy was performed. Histology confirmed the diagnosis, evidencing a poorly differentiated serous-papillary carcinoma of the right ovary. In conclusion, cytological and histological findings can play a crucial role in suggesting the correct origin of a metastatic adenocarcinoma when the clinical presentation is atypical
Sutton's nevus and growth hormone therapy.
No full textGrowth hormone (GH) has been suggested to increase the growth of melanocytic nevi and the risk for melanoma in short children treated with substitutive therapy. On the contrary, in GH deficient patients the influence of GH treatment on the appearance and the long-term evolution of Sutton's nevus, a pigmented melanocytic lesion surrounded by a ring (halo) of depigmentation, that usually and progressively involves the nevus, is debated. The aim of this study was to investigate whether GH therapy causes an accelerated growth of Sutton's nevus. In our study, we evaluated 3 children with GH deficiency sharing Sutton's nevus to investigate the relationship between these melanocytic lesions and growth hormone. In case 1 the appearance of the nevus could be induced by hGH therapy. However, the lesion did not change in shape, colour and size even if he entered puberty during substitutive treatment. Moreover, Sutton's nevus is present in case 2, who is prepuberal and not yet treated with hGH. In case 3 Sutton's nevi occurred during GH treatment and after the onset of puberty, but didn't show any long-term change in both the number and size. No clear influence of both GH therapy and sexual steroids on Sutton's nevi was observed
Pros and cons on sublingual immunotherapy in children allergic to house dust mites
Full text linkAllergic asthma is a common pathology in children and house dust mites are the most
frequent indoor allergens implicated 1. The Global Initiative for Asthma (GINA) guidelines
has defined the management of allergic asthma, which recommends the association of
allergen avoidance, pharmacologic treatment and allergen immunotherapy, when
indicated 2.
Immunotherapy is a specific therapeutic approach in the treatment of allergic airway
disease and insect venom allergy and has been utilized for decades: it is therefore
recommended to start it as soon as possible in allergic children to modify the natural
course of respiratory allergy. Specific immunotheraphy (SIT) has been shown to be
effective in reducing asthmatic symptoms, medication use and bronchial hyperresponsiveness
3-4. Additionally, it has been recently shown that specific
immunotherapy can be also used to prevent the occurrence of new sensitizations to
airborne allergens in children exclusively sensitized to house dust mites 5-6. However,
subcutaneous administration of SIT is inconvenient, time and resource consuming and is
occasionally associated with severe systemic side effects despites the guidelines
developed for its use 7. On the other hand, sublingual immunotherapy (SLIT), which has
been developed over the past 20 years, offers a better safety profile and ease of use.
These advantages make it an attractive option for children 8-9.
The aim of this article is to review current knowledge related to SLIT in children allergic
to mites and to identify needs for future research in this field
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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