1,721,014 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
On the composition and function of the gut microbiome of two insect species, the generalist Spodoptera littoralis and the specialist Melolontha hippocastani
Get PDFStable Isotope Probing (SIP) using cellulose and urea as trophic links pointed towards the bacterial families Lachnospiraceae and Enterococcaceae in larvae and Enterobacteriaceae in adults as involved in cellulose processing. The genus Burkholderia in larvae and the genus Parabacteroides in adults were labeled with 15N urea (Article I). These shifts may be consequence to differences in carbon and nitrogen needs. 454-pyrosequencing revealed that the hindgut wall community was composed mainly by the Caulobacteraceae and Pseudomonadaceae families in second instar larvae, while in third instar the dominant families were Porphyromonadaceae and Bacteroidales-related. The hindgut wall community of adults was fairly similar to third instar larvae (Article III). Previous studies determined that the gut bacterial community of S. littoralis is not very rich. As E. mundtii had been targeted as a metabolically active symbiont by 13C-glucose SIP, this bacterium was isolated and its genome sequenced. E. mundtii genome presented an elevated percentage of coding capacity (12%) devoted to carbohydrate uptake (Article II). Altogether, the genome of E. mundtii suggests that this symbiont plays a crucial role in the digestion of host diet. Previous observations of M. hippocastani hindgut spotted specialized organs of unknown function (pockets). 454 pyrosequencing allowed identifying pocket bacteria as Achromobacter sp. and Micrococcaceae-related. Gas Chromatograhy Mass Spectrometry analysis revealed that Achromobacter sp. accumulated poly-β-hydroxybutyrate (PHB) in vitro. Presence of PHB was also detected in whole pocket tissue by Raman microspectroscopy. PHB might be crucial for the successful symbiotic colonization of the pockets (Article III)
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
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
Photoresponsive modulation of a freshwater phytoplankton community by bacterial lipopeptides
Get PDFPhotoreactive lipopeptide siderophores are intriguing compounds that are well-known from the marine environment. Once they have complexed Fe3+, these compounds undergo photooxidative cleavage, thereby releasing Fe2+ into the environment. The solubilized iron is then not only available to the siderophore producer, but to the whole microbial community. This can result in mutualistic interactions, with bacteria providing iron to phytoplankton and obtaining photosynthetically fixed carbon in exchange (carbon for iron mutualism). Photoreactive lipopeptide siderophores have recently also been found in freshwater and soil. In this study, variochelins from Variovorax boronicumulans are presented as further example, as well as seven further putative producers discovered by genome mining. These findings corroborate the assumption that photoreactive lipopeptide siderophores are also widely distributed in non-marine environments, raising the interest for their ecological role. In freshwater, mutualistic iron sharing is well-conceivable. This is addressed in the second part of the study. Here, the cupriachelin-based interaction between the bacterium Cupriavidus necator H16 and the diatom Navicula pelliculosa is investigated. Since iron usually represents a limiting factor for algal growth, diatoms are expected to strongly benefit from a carbon for iron mutualism. If so, they could further maximize their advantage by manipulating siderophore biosynthesis by the bacterium. Effectively, culture supernatants of N. pelliculosa were found to induce cupriachelin transcription levels in C. necator H16. Planktic interactions are well-documented on a substrate exchange basis, but this is one of the few studies reporting crosstalk on a transcriptional level. In conclusion, photoreactive siderophores play an important role in iron cycling in aquatic environments. They form a basis for interspecies interactions and thereby have the potential to shape planktic communities
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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