1,720,994 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
Locus K: cuneate subnuclear regions in human dorsal column nuclei with neurochemical, cyto- and myeloarchitectural features of protopathic sensory nuclei
No full textLocus K: novel denomination for cuneate subnuclear regions in the human dorsal column nuclei with neurochemical, cyto- and myeloarchitectural features of the protopathic sensory nuclei
No full textDiscovery Of Novel Subregions Of The Human Cuneate Nucleus Whose Neurochemical Features Match Those Of Nociceptive Sensory Nuclei
No full textTraditionally, the spinal dorsal column and the gracile (GN) and cuneate (CN) nuclei are considered to convey somatic tactile and proprioceptive stimuli. However, clinical and experimental studies prove
their involvement in visceral nociception. Early studies in our laboratory showed that, at variance with that of laboratory animals, the human CN contains discrete subregions strongly immunoreactive to
substance P (SP), a neuropeptide classically involved in pain transmission. Here we provide further information on the chemical neuroanatomy of the human dorsal column nuclei and show that the
SP-immunoreactive subregions of the CN retain the neurochemical features of the protopathic relay nuclei.
Tissue distribution of neuropeptides SP, calcitonin gene-related peptide, leucine- and methionine-enkephalin, somatostatin, galanin and peptide histidine-isoleucine, trophins of the Neurotrophin and
Glial-derived neurotrophic factor families and related receptors, transient receptor potential vanilloid type-1, and neuroplasticity-associated proteins growth-associated protein-43 and polysialylatedneural
cell adhesion molecule was analyzed by immunohistochemistry in postmortem specimens of medulla oblongata from subjects aged 21 gestation weeks to 78 years, with no signs of
neuropathology.
Immunoreactivity to the examined molecules labels neuronal elements with similar aspect and density in the GN and main CN. By contrast, in restricted areas of the CN, located along its dorsal edge or
embedded in the cuneate fasciculus, immunoreactive elements show aspect, density and reciprocal distribution strikingly similar to those detected in the superficial layers of the spinal dorsal horn and
trigeminal subnucleus caudalis.
We propose that, at variance with that of laboratory mammals, including primates, the human CN contains clear-cut, previously uncharacterized subregions with neurochemical features reminiscent of
those present in the relay nuclei for protopathic and pain perception. Moreover, the peculiar localization of the examined substances suggests that the superficial layers of those regions may constitute a
“gelatinous subnucleus”. The origin and functional involvement of such innervation remains to be elucidated
Further studies on the Lymantria dispar feromonal gland and terminal abdominal ganglion: fine structure and neurochemistry
No full textVariations 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
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