1,720,986 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
THE ADP-RIBOSYLTRANSFERASE FROM NEISSERIA MENINGITIDIS DISPLAYS AUTO-ADP-RIBOSYLATION ACTIVITY
No full textN
A NOVEL NAD:ARGININE:ADP-RIBOSYLTRANSFERASE FROM NEISSERIA MENINGITIDIS
No full textMono ADP-ribosylation is catalyzed by ADP-ribosyltransferases (mADPRTs) that transfer a single residue of ADP-ribose (ADPR) from NAD to specific amino acids of selected proteins with the simultaneous release of the nicotinamide (nam) moiety. This reaction was initially discovered as the mechanism by which diptheria toxin blocks eukaryotic protein synthesis. A number of other potent bacterial toxins produced by B. pertussis, C. botulinum, E. coli, P. aeruginosa, B. cereus, and V. cholerae were shown to alter host functions by ADP-ribosylating diphtamide, arginine, cysteine and asparagine residues of target proteins involved in critical metabolic or regulatory pathways. Database search in the recently sequenced genome of Neisseria meningitidis (serogroup B, strain MC58) performed using a PSI-BLAST has evidenced an ORF with significant sequence similarity to known prokaryotic and eukaryotic mADPRTs that we named NM-ADPRT. The overall sequence identity with heat-labile enterotoxin from E. Coli is 29.6% and 26.8% with cholera toxin. The homology is mostly restricted to the domains corresponding to the catalytic cleft. In particular the three residues that have been shown to be crucial for ADPRT activity in bacterial toxins like Arg in domain 1 Ser in domain 2 and Glu in domain 3, are also conserved in NM-ADPRT (R7, S70, and E120). Moreover, this transferase shows a biglutamic acid motif typical for arginine specific transferase and NAD-glycohydrolase (E118-X-E12o). To verify whether the NM-ADPRT exerted the predicted enzymatic activities we cloned it in a T7-based plasmid with a His6-tag at the carboxy terminus. The purification of the protein through metal chelate affinity chromatography resulted in a single polypeptide of 20 kDa under SDS-PAGE. This purified NM-ADPRT was shown to utilize the guanidine group of agmatine, a modified arginine, as ADP-ribose acceptor producing ADP-ribosylagmatine at a rate of 6.7± 0.87nmoles hr-1. NM-ADPRT was also able to release nam from NAD at a rate of 8.5 ± 0.35nmoles hr-1 showing NAD-glycohydrolase activity
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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