1,720,958 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
Heterogeneous topographic and cellular distribution of huntingtin expression in the normal human neostriatum
No full textA striking heterogeneous distribution of topographic and cellular huntingtin
immunoreactivity was observed within the human neostriatum using three distinct
huntingtin antibodies. Patchy areas of low huntingtin immunoreactivity were
present in both the caudate nucleus and putamen, surrounded by an intervening
area of greater immunoreactivity. Comparison of huntingtin immunoreactivity with
contiguous serial sections stained for enkephalin and calbindin D28k
immunoreactivities showed that the topographic heterogeneity of huntingtin
immunostaining corresponded to the patch (striosome) and matrix compartments
within the striatum. Huntingtin immunoreactivity was confined primarily to
neurons and neuropil within the matrix compartment, whereas little or no neuronal
or neuropil huntingtin immunostaining was observed within the patch compartment.
There was marked variability in the intensity of huntingtin immunolabel among
medium-sized striatal neurons, whereas a majority of large striatal neurons were
only faintly positive or without any immunoreactivity. Combined techniques for
NADPH-diaphorase enzyme histochemistry and huntingtin immunocytochemistry, as
well as double immunofluorescence for either nitric oxide synthase or calbindin
D28k in comparison with huntingtin expression, revealed a striking correspondence
between calbindin D28k and huntingtin immunoreactivities, with little or no
colocalization between NADPH-diaphorase or nitric oxide synthase neurons and
huntingtin expression. These observations suggest that the selective
vulnerability of spiny striatal neurons and the matrix compartment observed in
Huntington's disease is associated with higher levels of huntingtin expression,
whereas the relative resistance of large and medium-sized aspiny neurons and the
patch compartments to degeneration is associated with low levels of huntingtin
expression
Differential expression of normal and mutant Huntington’s disease gene alleles
No full textHuntingtin expression was examined by Western blot and immunoprecipitation
studies of lymphoblastoid cell lines from Huntington's disease (HD) homozygotes,
heterozygotes, and a phenotypically normal individual with a t(4p16.3;12p13.3)
breakpoint in the HD gene. The latter produced a reduced level of normal
huntingtin without evidence of an altered protein, indicating that simple loss of
huntingtin activity does not cause HD. In juvenile onset HD heterozygotes, NH2-
and COOH-terminal antisera revealed reduced relative expression from the mutant
allele. Pulse-chase studies indicated that huntingtin is a stable protein whose
differential allelic expression is not due to destabilization of the mutant
isoform. No stable breakdown products specific to mutant huntingtin were detected
in either HD homozygotes or heterozygotes. These data are consistent with HD
involving either a gain of function or a dominant negative loss of function that
operates within severe constraints and suggest that in either case the pathogenic
process is usually saturated by the amount of abnormal huntingtin produced from a
single mutant allele
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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