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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
Yield performance of naked barley NILs and QTL analysis of yield traits in a naked x hulled DH population
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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
Development of a deletion map of wheat chromosomes 5A and 5B
No full textThe International Wheat Genome Sequence Consortium, aimed to physical mapping of bread wheat genome, assigned to Italian research groups the genetic and physical mapping of 5A chromosome. This chromosome is one of the most lacking in genetic markers, so the aim of this work was to find new molecular markers on chromosome 5A to saturate the existing genetic map, and to develop a cytogenetic deletion map of the homeologous chromosomes 5A and 5B. A total of 134 microsatellite markers were screened for polymorphism between Chinese Spring and Chinese Spring-5A dicoccoides (a Chinese Spring whose 5A chromosome was replaced with the 5A from the Triticum turgidum var. dicoccoides accession #TA106), which are the parental lines of the RIL population that will be used for the SSR genetic mapping (still in development). 115 of the markers were genomic microsatellites (gSSR) and 19 were EST-derived SSRs developed by La Rota et al. (2005) and available at http://wheat.pw.usda.gov. Polymorphic bands were visualized on agarose and acrylammide gels, and by capillary electrophoresis performed using an ABI PRISM 3100 Avant Genetic Analyzer. Both polymorphic and monomorphic SSR markers among the two parental lines were cytologically mapped to bins of chromosomes 5A and 5B by using a set of aneuploid lines derived from Chinese Spring, represented by nulli-tetrasomic, di-telosomic and deletion bin lines. In particular, the physical mapping on 5A chromosome was conducted with the lines N5A-T5B, N5AT5D, DT-5AL, and 14 deletion lines of which 4 belonging to the 5A chromosome short arm, and 10 to the long arm. All the lines were tested for carrying the correct homozygous terminal deletion by PCR amplification with specific SSR markers belonging to the missing chromosome region. A total of 92 markers were physically mapped, of which 43 on 5A, 30 on 5B and 4 on 5D; 17 SSRs produced multiple loci mapped to bins of 5A and 5B (13) and 5B and 5D (4), and two had bands located on 5A, 5B and 5D. For both the homeologous the majority of the markers were physically mapped in the bins of the long arm. The most represented bins were 5AL3-0.56-0.64 for 5A and 5BL6-0.29-1.00 for 5B, while the regions which were the most lacking of markers were bins C-5AL3-0.56 and C-5BS4-0.43 respectively for 5A and 5B
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