1,721,038 research outputs found
Predictive and early signs of psoriatic arthritis: a deeper insight based on literature evidence
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
New developments in ultrasound in rheumatology: innovative tools and promising applications
No full textIn the setting of rheumatology, the assessment of the involvement of joints and peri-articular structures was the first application of ultrasonography in the management of rheumatic diseases. In this field, the main novelties are related to the development of new technical tools to help overcome some of the limitations of conventional ultrasono-graphic assessment. In the meantime, there has been a growing interest in the application of ultrasound to extra-articular sites, relying on the definition of new indications. The present review aims to provide a critical analysis of the technical developments and new fields of application of ultrasonography in rheumatology
Life history traits and reproductive mode of the tardigrade Acutuncus antarcticus under laboratory conditions: strategies to colonize the Antarctic environment
No full textGlobal climate change has become an important issue, particularly for organisms living in the Antarctic region, as the predicted temperature increase can affect their life history traits. The reproductive mode and life history traits of one of the most widespread species of tardigrades in Antarctica were analyzed. Specimens of the eutardigrade Acutuncus antarcticus from a temporary freshwater pond at Victoria Land (Antarctica) were individually cultured. This species reproduced continuously by thelytokous meiotic parthenogenesis. Its life cycle was short (60–90 days) and the reproductive output was low, with a short generation time (25–26 days). The maternal effect can be responsible of the phenotypic plasticity observed in life history traits of the three analyzed generations that may be seen as a bet-hedging strategy, as also observed in other animals inhabiting stochastic environments. These traits, along with the cryptobiotic capability of A. antarcticus, are advantageous for exploiting the conditions suitable for growth and reproduction during the short Antarctic summer, and can explain its wide distribution on the Antarctic continent. These results open new avenues of research for determining the role of bet-hedging strategy in organisms living in unpredictable environments
Primary Hepatic Angiosarcoma
No full textPrimary hepatic angiosarcoma is a rare entity, representing only 4%
of all the angiosarcomas of different origins1 and less than 1% of all
hepatic malignancies.2
Accurate diagnosis of this tumour is difficult, especially if the
patient has no history of exposure to specific carcinogens including
thorotrast, arsenicals and vinyl chloride monomer.3
Angiosarcoma, a subtype of soft tissue sarcoma, is an aggressive
malignant disease deriving from endothelium, lymphatics or blood
vessels. Some of the more common hepatic sarcomas are angiosarcoma,
embryonal sarcoma, leiomyosarcoma, epithelioid hemangioendothelioma,
fibrosarcoma and malignant fibrous histiocytoma.2
The survival of hepatic angiosarcoma is very poor, which is attributable
to its rapid progress, high recurrence rate and resistant to
traditional chemotherapy and radiotherapy.4 The survival of patients
with liver angiosarcoma is very poor with median survival of 6
months without treatment; after treatment, only 3% of patients were
reported to live longer than 2 year
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