1,721,048 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
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
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Functional properties of aquaporin-1 ion channels in choroid plexus
No full textAquaporins (also known as water channels) are members of the Major Intrinsic Protein family. Ion channel function has been shown for several members of the aquaporin family and the related neurogenic gene product Big Brain. Aquaporin-1 (AQP1) is a transmembrane channel that mediates osmotically-driven water flux. Prior work demonstrated that AQP1 channels expressed in Xenopus oocytes mediate a cGMP-dependent cationic current. Based on amino acid sequence alignments with cyclic nucleotide-gated channels and cGMP-selective phosphodiesterases, I found that the efficacy of ion channel activation is decreased by mutations of AQP1 at conserved residues in the C-terminal domain (aspartate D237 and lysine K243). These data provide direct evidence for the involvement of the AQP1 carboxyl terminal domain in cGMP-mediated ion channel activation. Because the proportion of active AQP1 ion channels seen in heterologous expression systems is low, it was of fundamental importance to investigate the functional properties of this channel in a physiological context. Using rat choroid plexus, a brain tissue that secretes cerebral spinal fluid (CSF) and endogenously expresses abundant AQP1, I demonstrated the existence of native AQP1 ion channels that show properties similar to those described previously in the oocyte expression system. They mediate a cGMP-dependent cationic conductance, are blocked by cadmium, and show a single-channel conductance of 166 pS. Given the skull's rigidity, pathological increases in CSF secretion (tumors, hydrocephalus, stroke) can result in brain damage. In the choroid plexus several proteins work in concert to regulate CSF secretion. The findings presented in this dissertation are first to demonstrate that AQP1 mediates a cationic current in response to intracellular signals that regulate CSF secretion such as ANP signaling. Fluxes of water and Na⁺ across confluent choroid plexus cell monolayers showed a decreased flow rate following treatment with ANP, and Cd²⁺ reversed the inhibitory effect. These results suggest that activation and block of the AQP1-mediated ionic current may alter net fluid transport across the choroid plexus barrier, and therefore be physiologically relevant in the regulation of net fluid transport in choroid plexus. This places AQP1 as one of the important targets for clinical intervention in brain volume disorders
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