1,720,969 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
Co-selection of antimicrobial resistance in livestock pathogens and zoonotic agents
No full textThis dissertation investigated the effects of post milking teat disinfectants on bacterial susceptibility, prevalence of culturable teat bacteria, and cross-resistance to antibiotics. Chapter one investigated effects of a 6 days intervention with chlorhexidine (CH), lactic acid (LA), and untreated at 2 and 13 weeks after the intervention. For this, 476 bacterial isolates from 224 milk samples were identified by MALDI-ToF MS. The minimum inhibitory concentration (MIC) of CH and LA was determined for 404 isolates, and mastitis antibiotics were tested for Aerococcus (A.) viridans (n = 36) and Staphylococcus (S.) haemolyticus (n = 85). The results showed, both disinfectants were effective against udder pathogens. However, selection of Corynebacterium (C.) spp. was sustained all time points compared to before treatment; simultaneously, a significant increase in LA tolerance was observed in S. haemolyticus and A. viridans. Antibiotic susceptibility, showed minimal changes. These results underscore the potential for adaption of udder pathogens to disinfectant and shifts in the teat microbiome, possibly due to subinhibitory exposure. Chapter two investigated in vitro effects of subinhibitory LA exposure. Where, S. haemolyticus (n=5), A. viridans (n=9), and C. bovis (n=6), were exposed to a subinhibitory concentration of LA for 30 days. Tolerance to LA was continuously assessed as MIC values using macrodilution. Changes in antibiotic MIC were measured before and after LA exposure using microdilution. Results showed a significant increase in tolerance to LA and β-lactam antibiotics in A. viridans, with a modest change in S. haemolyticus. No such change was observed in C. bovis. This suggests that A. viridans and S. haemolyticus have the potential to develop tolerance to LA and cross-resistance to β-lactam antibiotics
Charakterisierung der Plasmide von Enterobakterien aus pflanzlichen Frischeprodukten und Übertragung von Antibiotikaresistenzplasmiden zwischen Bakterien auf pflanzlichen Lebensmitteln
Full text linkRoh verzehrte pflanzliche Frischeprodukte sind wichtiger Bestandteil einer ausgewogenen Ernährung. Sie können allerdings Träger antibiotikaresistenter Bakterien sein, die durch den Verzehr vom Menschen aufgenommen werden. Besonders zu beachten sind dabei Bakterien mit konjugativen Antibiotikaresistenzplasmiden, die Resistenzgene zwischen Bakterien übertragen können. Um das Gefahrenpotenzial besser beurteilen zu können, wurden Plasmide von Enterobakterien von pflanzlichen Frischeprodukten charakterisiert. Die Weitergabe von konjugativen Resistenzplasmiden wurde mit dem Escherichia (E.) coli-Empfänger CV601 mittels Konjugationsexperimenten und exogener Plasmidisolierung von Sprossen ermittelt. Zusätzlich wurde der Einfluss von Nährstoffen und Temperatur auf die Plasmid-Transferraten ermittelt. Für die vollständige Darstellung der Plasmide wurden die MiSeq- und MinION-Sequenzierdaten mittels Unicycler kombiniert. Insgesamt waren in 17 der 22 Isolate 40 Plasmide vorhanden, die sich in ihrer Größe, Mobilität und Anzahl an Resistenzgenen unterschieden. IncF war der häufigste Replikontyp der großen Plasmide. Ein Klebsiella (K.) pneumoniae- und ein E. coli-Spender erzeugten erfolgreich Transkonjuganten. Temperatur und Nährstoffangebot hatten Einfluss auf die Transferrate zwischen dem K. pneumoniae-Spender und dem E. coli-Empfänger (höchste Transferraten: Salatagar, 37 °C). Auch auf Salat und Sprossen war Plasmidtransfer nachweisbar. Niedrige Temperaturen (10 °C) verringerten bzw. hemmten den Transfer. Tetracyclin-Resistenz vermittelnde IncFII- und IncFIB- Plasmide wurden von Sprossen exogen eingefangen. Die Ergebnisse zeigen, dass pflanzliche Frischeprodukte ein Vehikel für die Übertragung von Antibiotikaresistenzplasmiden auf den Menschen darstellen
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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