1,721,002 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
BMD alterations in HIV-infected pregnant women and in their infants
No full textIn both HIV-infected adults and children skeletal abnormalities, including decreased bone mineral content
and bone mineral density are frequently reported (1,2,3,4), although the mechanisms of the pathogenesis of
these alterations have not completely assessed. Several studies have concluded that, at least in infected
adults, bone disorders are strongly associated with HIV itself that can infect ostoblasts or indirectly alter
osteoclasts and osteoblast function through T-cell activation and increased production of bone-resorbing
cytokines like IL-1, IL-6 and TNF-alfa (5,6,7). Besides, the duration of infection, often causing physical
inactivity and poor nutrition, can contribute to decrease bone mineral content and increase bone turnover in
HIV- infected patients (8,9,10).
On the other hand, in HAART (Hihgly Active Antiretroviral Therapy) era many reports on bone
disorders in HIV-infected adults and all of those in children suggest that prolonged administration of
protease inhibitor (PI)-containing regimens plays a role in the pathogenesis of abnormal bone
metabolism, by inducing osteoclast and osteoblast dysfunction . With regard to HIV-infected HAARTtreated
pregnant women, the evolution of bone mineralization and metabolism has not thoroughly
studied yet.
The lack of data about the bone changes occurring over time in these subjects and about the risk of
consequences in their newborns and infants (infected or not) who are exposed “in utero” to the same
antiretroviral drugs prompted us to study the bone strength in a cohort of HIV-infected pregnant
women treated with different therapeutic protocols and in their children, followed from birth to the end
of the first year of life with bone density measurements
Effect of transport on rabbit’s welfare: serum lysozyme determination
No full textThe aim of this study was to determine the influence of transport and lairage on serum lysozyme concentration to study animals’ stress. Lysozyme is considered as a component of the earlier protective mechanisms. Studies of the stress influence on lysozyme concentration are scarce. In this work the effects exerted on welfare by different times of journey (1 vs 3h) and lairage (0 vs 5h) were tested on 70 rabbits. To analyse lysozyme, two blood samples have been taken immediately before and after the animal transport and lairage. Lysozyme concentration was determined using a micromethod assay set up at DIPAV starting from the lysoplate Ossermann’s method. In short transport without lairage (14.7±8.8 vs 11.8±6.6 μg/ml) and short transport with lairage (8.9±3.0 vs 6.0±3.6 μg/ml) groups, a decrease of lysozyme activity was observed after transport, whereas in long transport without lairage (7.4±2.3 vs 9.4±3.9 μg/ml) and long transport with lairage (13.7±11.3 vs 16.8±13.0 μg/ml) groups, an increased activity after transport was noticed from initial values. Probably transport leads to changes in neuroendocrine and immune system-derived substances, which influence the innate immune factors, but a detailed explanation of these mechanisms needs some additional studies
La densitometria ultrasonografica nella diagnosi precoce delle alterazioni della massa ossea in pazienti pediatrici HIV-infetti
No full text
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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