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
Heterogeneous visceral nerve changes in acrylamide intoxication
No full textA variety of visceral nerves were studied by intermediate filament immunocytochemistry in rats intoxicated with acrylamide. Oesophageal and diaphragmatic motor end-plates were invaded and deformed by NF protein-like material, while afferent fibres of diaphragmatic neuromuscular spindles and myelinated sensory fibres of the iris showed striking terminal accumulation of similar material. The rich population of thin afferent fibres of the iris did not show abnormality, while pre-terminal changes were seen along the extrinsic fibres supplying the cornea and myenteric ganglia. Multiple lesions occurred in gut nerves, while scattered "enteric glial cells" were abnormally coarse and showed sharp increase of GFAP immunoreactivity. A distinct, delicately varicose appearence was revealed by NF protein immunostaining in bladder nerve fibers of normal rats, which was changed to one of coarse dilations by acrylamide.
Apparently selective changes were found along different types of axons, indicating marked heterogeneity in cytoskeletal organization among visceral nerves. A non-uniform distribution of neurofilament degradation sites along distal regions of different axons is therefore suggested
EXPERIMENTAL ßß'-IMINODIPROPIONITRILE NEUROPATHY: NEUROFILAMENT PROFILE OF SENSORY, MOTOR AND AUTONOMIC NERVES AS SEEN BY IMMUNOCYTOCHEMISTRY ON WHOLE-MOUNT PREPARATIATIONS
No full textExperimental beta beta'-iminodipropionitrile (IDPN) neuropathy: neurofilament profile of sensory, motor and autonomic nerves as seen by immunocytochemistry on whole-mount preparations
No full textIDPN-induced changes in a variety of sensory, motor and autonomic nerves were studied by whole-mount immunocytochemistry. A full range of proximo-distal accumulations of neurofilament-like material was found, from paranuclear round bodies in perikarya to distal and preterminal axonal dilations. Conversely, both terminal areas and nodal-paranodal regions of myelinated axons showed striking, sharply localized loss of neurofilament-immunostaining. The latter change, when transport of neurofilaments is halted by IDPN, may indicate their local processing and/or differential transport at nodal-paranodal regions
2,5-Hexanedione-induced accumulations of neurofilament-immunoreactive material throughout the rat autonomic nervous system.
No full textIn rats intoxicated with 2,5-hexanedione, nerve fibres supplying virtually all
visceral organs showed large numbers of densely immunoreactive accumulations of
neurofilament-like material, of fusiform, elongated, smoothly tapering
morphology. In the gut, round to oval, morphologically different lesions were
also present, and abnormal neurofilament-immunoreactive accumulations were
revealed in oesophageal terminal end-plates. An extensive damage to autonomic
nerve fibres, which are largely non-myelinated, was thus revealed in
2,5-hexanedione intoxication. The observed diversity in lesion morphology may
suggest heterogeneity in cytoskeletal and/or associated proteins among autonomic
neurons
EFFECTS OF RESPIRATORY TREATMENT WITH N-HEXANE IN THE RAT. ULTRASTRUCTURAL TESTICULAR CHANGES
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