1,721,031 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
IRMPD spectroscopy of protonated S-nitrosocaptopril, a biologicallyactive, synthetic amino acid
No full textAppropriate 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
Vibrational Signatures of S-Nitrosoglutathione as Gaseous, Protonated Species
No full textGas-phase ions of protonated l-glutathione as native species, [GSH + H](+), and S-nitroso derivative, [GSNO + H](+), have been generated by electrospray ionization and probed via infrared multiple photon dissociation (IRMPD) action spectroscopy. Insight into the conformational landscape is gained from interpretation of the IR spectra aided by high-level theoretical calculations, which enables structural assignment disclosing both the site of protonation and the intramolecular hydrogen-bond network. Calculations yield the low-energy structures of [GSNO + H](+). A admixture of the four most stable ones (SN1, AN1, SN2, and AN2) is apt to account for the experimental IRMPD spectra obtained in both the 10002000 and the 31003700 cm(1) spectral ranges. The most stable form of [GSNO + H](+), SN1, protonated at the amino group, presents a syn conformation at the SN (partial) double bond and all peptidic carbonyls involved in (strong) C=O center dot center dot center dot HN hydrogen bonds, so allowing closure of a C5 (beta-strand), two C7 (gamma-turn), and one C9-membered rings. An appreciable barrier to rotation of 43 kJ mol(1) about the SN bond is found to separate SN1 from the analogous anti isomer AN1, which lies only 0.70 kJ mol(1) higher in free energy. Conformers obtained for [GSH + H](+) are very similar to the [GSNO + H](+) counterparts, indicating that the S-nitrosation motif does not affect significantly the geometry of the peptide. The observed nu(NO) signatures at 1622 and 1690 cm(1), merged with other absorptions, are revealed by their sensitivity to (NO)-N-15 isotope labeling and by comparison with the IRMPD spectrum of native [GSH + H](+), providing a diagnostic probe for the S-nitrosation feature in natural peptides
Amino-acids oxidation: a combined study of cysteine oxo forms by IRMPD spectroscopy and simulations
No full textThe redox activity of cysteine sulfur allows numerous post-translational protein modifications involved in the oxidative regulation of metabolism, in metal binding, and in signal transduction. A combined approach based on infrared multiple photon dissociation spectroscopy at the Centre Laser Infrarouge d’Orsay (CLIO) free electron laser facility, calculations of IR frequencies, and finite temperature ab initio molecular dynamics simulations has been employed to characterize the gas-phase structures of deprotonated cysteine sulfenic, sulfinic, and sulfonic acids, [cysSOx]- (x=1, 2, 3, representing the number of S-bound oxygen atoms), which arekey intermediates in the redox-switching chemistry of proteins.
The ions show different structural motifs owing to preferential binding of the proton to either the carboxylate or sulfur-containing group. Due to the decreasing basicity of the sulfenic, sulfinic, and sulfonic terminals, the proton bound to SO- in [cysSO]- migrates to the carboxylate in [cysSO3]-, whereas it turns out to be shared in [cysSO2]-. Evidence is gathered that a mixture of close-lying low-energy conformers is sampled for each cysteine oxo form in a Paul ion trap at room temperature
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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