1,720,959 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
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
Analysis of human histone deacetylase 6 and its associated protein Ubl90
No full textAmong mammalian histone deacetylases (HDACs) identified so far, HDAC6 is unique in that it possesses tandem deacetylase domains, as well as a carboxyl-terminal zinc finger motif implicated in ubiquitin binding. HDAC6 has also been demonstrated to deacetylate tubulin and thus potentially contribute to regulation of cell motility. Although HDAC6 has been reported to interact with a variety of nuclear factors, this enzyme is predominantly localized to the cytoplasm.Here I show that the subcellular localization of human HDAC6 is governed by additional elements not present in orthologues of this protein from other species. Human HDAC6 contains a unique insertion of eight or ten repeats of a Ser/Glu-containing tetradecapeptide sequence, here termed the SE14-repeat domain, which is responsible for mediating the Leptomycin B-resistant cytoplasmic retention of human HDAC6. Human HDAC6 also contains a second functional leucine-rich nuclear export signal when compared to murine HDAC6, and a region near the amino terminus of human HDAC6 is capable of mediating nuclear import.I have also identified a previously uncharacterized protein containing a ubiquitin-like domain, here termed Ubl90, as a novel binding partner for HDAC6. Interestingly, Ubl90 binds to the deacetylase domains of HDAC6, rather than to the carboxyl-terminal zinc finger motif previously implicated in ubiquitin association. Ubl90 also interacts with several class I HDACs (HDAC1, HDAC2 and HDAC8), although more weakly than with HDAC6. When Ubl90 is overexpressed, it leads to the redistribution of HDAC1 from a nuclear to a pancellular localization, although this does not affect HDAC1-dependent transcriptional repression in a transient transfection assay. Like HDAC6, Ubl90 is capable of repressing Runx2-mediated transcriptional activation, and, when overexpressed, it leads to cell cycle disturbances similar to those seen with HDAC6 overexpression. These results suggest that Ubl90 and HDAC6 interact functionally, as well as physically
Immunogold localization of photosystems I and II in the green alga Chlamydomonas reinhardtii and the higher plant Pisum sativum : a comparative study
No full textThe distribution of Photosystems (PS) I and II was studied in the green alga Chlamydomonas reinhardtii and compared to that found in the higher plant Pisum sativum. Two antibodies were used; one, anti-CP1-e, was raised against the two reaction center proteins of PS I from Synechococcus elongatus, and the other, anti-CP40, was raised against the 40 kDa protein of PS II from the same organism. Immunogold labelling of C. reinhardtii sections showed that both appressed and non-appressed thylakoid membranes were labelled by each antiserum, with labelling on the non-appressed membranes being somewhat (1.7-1.8 times) higher than that on the appressed membranes.In P. sativum, anti-CP1-e labelling was 3.9 times higher on the non-appressed membranes than on the appressed ones, whereas anti-CP40 labelling was equally concentrated on both classes of membranes. The data show that PS distribution in C. reinhardtii is similar to that reported for other algae and different from that in higher plants
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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