1,720,962 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
Identification of plasmids in Diaporthe helianthi isolates from different geographic origin
No full textDiaporthe helianthi is the causal agent of sunflower stem canker and it is threatening in Europe, although sporadically recorded in Italy. In a program aimed to investigate molecular variability among D.helianthi isolates from several countries, our approach was focused on the identification of extrachromosomal genetic determinants.
Twenty-six isolates from different geographic origin, 14 deriving from France, 3 from ex-Yugoslavia, 3 from Argentina, 1 from Romania, 5 from Italy, have been studied.
Extrachromosomal bands have been detected in most isolates. Rnase A and DNA exo-nucleases (exo-III and exo-λ) digestions suggested they were DNA plasmid-like elements apparently with a circular conformation.
More detailed analysis was then performed on a selected plasmid derived from a French isolate presumably present, as inferred by molecular weight, in all French and Yugoslavian isolates (countries were the disease has a heavy incidence). Its intracellular localisation resulted to be mitochondrial. In order to check its specificity, it was used in Southern blot experiments as a probe against DNAs derived from all twenty-six D.helianthi isolates.
Further investigations are needed to characterise that plasmid (cloning and sequence analysis) and to make a comparison (e.g. RFLP) with plasmids from the other D.helianthi isolates
Plasmid distribution in European Diaporthe helianthi isolates
No full textA collection of twenty-six Diaporthe helianthi isolates deriving from different geographic origin was analysed in order to determine the presence of extra-chromosomal genetic determinants and their molecular diversity. Extra-chromosomal bands in total genomic DNAs were identified in all the French and the Yugoslavian isolates and in only one Italian isolate, while no Romanian and Argentinean isolates resulted to host any plasmids. When tested for their chemical-physical nature by Rnase A and DNA exonucleases (III-exo and λ-exo) digestions, they were recognised as linear plasmids sized about 2.3 Kb. More detailed analysis was then performed on a plasmid purified from a French isolate (plasmid F). Its intracellular localisation resulted to be mitochondrial. Plasmid F was also exploited as a probe in Southern hybridisation experiments and it recognised only plasmids present in genomes of French and Yugoslavian isolates (countries were the disease has a heavy incidence) suggesting some specificity in relation to the geographic origin. An RFLP hybridisation analysis performed on genomic DNAs revealed a homogeneous restriction pattern in all French and Yugoslavian isolates, strongly supporting the hypothesis of a molecular relationship among plasmids present in those isolates
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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