1,721,061 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
STUDY OF MAIZE GENOTYPES RICH IN ANTHOCYANINS FOR HUMAN AND ANIMAL NUTRITION
Get PDFAnthocyanins are very important nutraceuticals not only because they protect plants against biotic and abiotic stresses (Winkel-Shirley, 2002) and they seem to be involved in plant yield (Frascaroli and Landi, 1998), but also because they exert antioxidant abilities able to protect human and animal health (Virgili and Marino, 2008). Maize is able to accumulate anthocyanin in different tissues (Escribano-Bailon et al., 2004; de Pascual-Teresa et al., 2002), so that it can be considered a functional food. On this basis the general aim of this PhD project was to develop maize genotypes with the usual commercial and nutritional value and at the same time able to accumulate anthocyanins in kernels, so to confer the new colored varieties a surplus value compared to the uncolored traditional ones.
In maize different allele combinations of the anthocyanin regulatory genes are able to color different tissues, in different extent. From the evaluation of these different genotypes some interesting results came to light: while the r1 gene seemed to be involved in maize yield, the B/Pl genotypes were able to reach the highest anthocyanin amounts in kernels. Therefore they were used to generate the lines characterized in this PhD thesis (popcorn, polenta and sweet corn). To develop uniform individuals, the parameters affecting the anthocyanin final amount in kernels had been studied: the seed weight, the pericarp thickness, the environment and the expression level of the regulatory genes. Among all, a primary role of the epigenetic phenomena emerged; this fact can complicate the breeding work because it force to select the most colored individuals generation by generation, so surely this aspect must be examined more in depth.
In the meanwhile a recurrent breeding scheme was used to develop pop corn, polenta and sugary corn colored with anthocyanin: a commercial yellow line was crossed with the colored variety carrying the B/Pl alleles for the anthocyanin biosynthesis. using the Marker Assisted Selection (M.A.S) to help the selection. The anthocyanin final amount in the kernels of the new developed colored lines has been considered as competitive compared to the usual anthocyanin sources, even if the cooking processing affected – but not wiped off- the pigment content and the antioxidant ability.
However the anthocyanin presence seemed not to affect the appreciability degree tested on a blinded group of subjects, so that the new color products could be ready for the market.
This kind of work and analyses are very interesting in regard the fact that two Near Isogenic Lines (NIL), differing for the synthesis of only one class of metabolites, are under comparison. This fact can simplify the study of the advantage given by the presence of the anthocyanins in foods; moreover these isogenic foods can also be used to analyze the relationship between the presence of the pigments in foods and the human and animal health and consequently to confer a property to a specific single class of molecules, simplifying the analyses and the reading of results
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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