1,720,974 research outputs found
La cultura della sicurezza: strumento di governo del rischio nell’Ospedale Pediatrico Bambino Gesù
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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
Toxic effect induced by ochratoxin A on fetal mesenchymal stem cells at nanomolar levels
No full textOchratoxin A (OTA) is one of the most frequently occurring mycotoxins in several food products and, under experimental conditions, it causes a wide spectrum of toxic effects, including teratogenicity, carcinogenicity, nephrotoxicity, and immunotoxicity. In laboratory animals, the exposure to OTA during pregnancy may interfere with embryonic development and may induce embryo lethality, growth delay and teratogenic effects. An alternative approach to in vitro predict the developmental risk of chemicals has been offered by mesenchymal stem cells (MSCs) isolated from fetal adnexa. The aim of this work is to study OTA effects at nanomolar concentrations, corresponding to levels detected in human placenta, on proliferation of canine umbilical cord matrix MSCs (UCM-MSCs). Cells were plated in 12-well dishes to perform doubling time (DT) analysis, cellular density and viability from passage (P) 1 to P7, by using Trypan blue dye exclusion test. OTA was added at concentrations ranging from 0.01ng/ml to 10ng/ml. Two experimental protocols of OTA treatment were performed: 1) continue exposure model; 2) alternate exposure model, in which cultures were performed for 3 days in standard medium followed by 4 days in presence of OTA. Control cultures received the same amount of OTA solvent (DMSO). After OTA exposure, cell proliferation was observed until P3, in contrast to control samples in which cells proliferated until P7. In both exposure models, DT values were higher than those found in control samples. In particular, lowest OTA concentrations (0.01–0.1ng/ml) significantly increased (P<0.0001) DT values compared with controls in both exposure models, with consequent inhibition of cell proliferation. No differences were observed between continue and alternate exposure models, leading to suppose that the cell damage early occurs and cannot be reversed independently of exposure model. At all passages, OTA treatment did not influence cell viability. In addition, changes in osteo- and neuron-like morphology were observed in treated cells at P3, in contrast with controls that maintained fibroblast-like morphology. The action mechanism of OTA on cell proliferation, at nanomolar concentrations, is not clear. It has been reported in renal epithelial cells that OTA may interact with cellular key targets, such as mitochondria, and interfere with Ca2+, pH and energy homeostasis, leading to the disturbance of cell signaling/proliferation and apoptosis. Moreover, OTA, in renal epithelial cells, may activate MAP-kinase, which cause cell dedifferentiation and transformation: this evidence could explain the morphological changes observed also in UCM-MSCs. In conclusion, OTA, at nanomolar concentrations, modulates physiological signals influencing cell growth, self-renewal and differentiation in UCM-MSCs as it may occur during embryo development
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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