1,721,003 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
TRAPIANTO DI MIDOLLO OSSEO NEI TUMORI SOLIDI DELL'INFANZIA
No full textVENGONO IDENTIFICATE LE CONDIZIONI CANDIDABILI AL TRAPIANTO DI MIDOLLO OSSEO NELL'AMBITO DEI TUMORI SOLIDI DELL'ETA' EVOLUTIVA. OLTRE ALLA DEFINIZIONE DELLE INDICAZIONI SPECIFICHE SONO ANALIZZATE LE OPZIONI TERAPEUTICHE IN AMBITO TRAPIANTOLOGICO E I RISULTATI OTTENUTI
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
IDENTIFICAZIONE E QUANTIFICAZIONE MOLECOLARE DI UREAPLASMA SPP. SU SECREZIONI RESPIRATORIE DI NEONATI PREMATURI CON RDS. RISULTATI PRELIMINARI
No full textJOINT REPORT OF THE FIRST INTERNATIONAL WORKSHOP ON HUMAN LEUCOCYTE DIFFERENTIATION ANTIGENS
No full textData internationally collected prompeted the "First Leucocyte Typing of Human Leucocyte Differentiation Antigens Detected by Monoclonal Antibodies". Specification, Classification, Nomenclature have been defined and credited at an international level
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
Plasma levels of receptor activator of nuclear factor-kappa B ligand and osteoprotegerin in patients with neuroblastoma
No full textEarlier reports showed that the balance between receptor activator of nuclear factor-kappa B ligand (RANKL) and its decoy-receptor osteoprotegerin (OPG) plays an important role in the pathogenesis of metastatic osteolysis induced by neuroblastoma cells. In this study, we investigated whether circulating levels of OPG, RANKL and their ratio were associated to the presence of osteolytic lesions in advanced neuroblastoma, as well as whether they provided additional information on the severity and prognosis of the disease. Plasma levels of RANKL and OPG were measured in 54 newly diagnosed neuroblastomas; 27 of them showed metastatic disease (stage IV), including 19 bone dissemination. Thirty-five children who were admitted to the pediatric department for minor surgical problems served as control group. OPG was significantly lower in all patients compared with controls, while RANKL levels were significantly increased in advanced neuroblastoma. OPG-to-RANKL ratio decreased in stage-IV patients, and particularly in those who had bone metastases. The diagnostic accuracy of the OPG-to-RANKL ratio in discriminating the presence of osteolytic lesions was not confirmed statistically. OPG correlated significantly with other prognostic factors, namely, ferritin and neurone-specific enolase. In addition, an inverse relationship was found between OPG and event-free survival, and it was more significant in patients who had bone metastasis. This pilot study confirms that the production of OPG and RANKL is disregulated in neuroblastoma. Although the OPG-to-RANKL ratio does not have a predictive value in detecting bone metastasis, the measurement of the previously mentioned markers could be useful in decisions regarding the use of adjuvant therapies
- …
