1,720,981 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
A novel telomerase-based approach to detect natural cell-mediated cytotoxic activity against tumor cells in vitro
No full textthis study was designed to develop a novel technical approach based on tumor-associated telomerase activity to detect cytotoxic activity of effector cells of the natural immune system against neoplastic cells. human K562, DAUDI or Raji leukemia cells were co-cultured with NK or LAK effector cells at 37 T for 4 h. target cell killing was evaluated by Cr-51-release assay (CRA) or reduction of telomerase activity (R-TRAP(CTX)) of the target after exposure to effector cells. NK and LAK effector cells tested against K562 target cells at effector/target ratio of 50:1 showed cytotoxicity of 65% and 78%, respectively, with CRA and 51% and 74%, respectively, with R-TRAP(CTX). Incorrect results were obtained with CRA when target cells were admixed with normal fibroblasts, whereas R-TRAP(CTX) was not influenced by the presence of normal cells. control experiments performed with telomerase-negative cells showed that telomerase activity of effector cells was not altered during the cytolytic reaction. moreover, supernatants obtained from effector-target cell co-cultures did not influence telomerase activity of targets. this novel R-TRAP(CTX) method to assay anti-tumor natural and possibly antigen-dependent cell-mediated cytotoxicity appears to provide sensible advantages over classical CRA or gamma-interferon release by effector cells in presence of target cells (ELISPOT), since (a) it furnishes reliable data on effector cell killing against neoplastic cells, even when malignant cells are admixed with normal cells, as frequently occurs in tumor biopsies, not manageable with CRA; (b) it provides an actual measure of target cell killing, not furnished by ELISPOT technique
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
Evaluation of timing of re-appearance of VBNC Legionella for risk assessment in hospital water distribution systems
Full text linkBackground. In this study we estimated the presence of Legionella species, viable but non-culturable (VBNC),
in hospital water networks. We also evaluated the time and load of Legionella appearance in samples found
negative using the standard culture method.
Methods. A total of 42 samples was obtained from the tap water of five hospital buildings. The samples
were tested for Legionella by the standard culture method and were monitored for up to 12 months for the
appearance of VBNC Legionella.
Results. All the 42 samples were negative at the time of collection. Seven of the 42 samples (17.0%) became
positive for Legionella at different times of monitoring. The time to the appearance of VBNC Legionella was
extremely variable, from 15 days to 9 months from sampling. The most frequent Legionella species observed
were Legionella spp and L. anisa and only in one sample L. pneumophila srg.1.
Conclusion. Our study confirms the presence of VBNC Legionella in samples resulting negative using the
standard culture method and highlights the different time to its appearance that can occur several months
after sampling. The results are important for risk assessment and risk management of engineered water
systems
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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