1,720,975 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
Studies on transmission of alien substitution gametes involving four rye chromosomes in winter wheat
No full textComparative DNA sequence analysis involving wheat, brachypodium and rice genomes using mapped wheat ESTs
No full textComparative genomics is a powerful approach to transfer genomic information from a sequenced genome to closely related species. We conducted a comparative genomics study between wheat and brachypodium genomes, using 8 210 mapped wESTs for BLASTn against the high-quality genome sequence of brachypodium. As many as 5 208 wESTs spread over all the 21 wheat chromosomes showed significant similarity with genomic regions in all the five brachypodium chromosomes (Bd1 to Bd5). Wheat ESTs belonging to seven homoeologous groups were also used to construct seven consensus maps (WC1 to WC7) for wheat chromosomes. Each consensus wheat chromosome matched only one or two brachypodium chromosomes. Following are the broad syntenic relationship that were observed between brachypodium and wheat chromosomes: WC1-Bd2/Bd3, WC2-Bd1/Bd5, WC3-Bd2, WC4-Bd1, WC5-Bd4/Bd1/Bd3, WC6-Bd3 and WC7-Bd1/Bd3. Eighty two (82) conserved syntenic blocks were also identified between wheat and brachypodium genomes. Ka/Ks analysis was performed on 153 sequence pairs, of which 98 had Ka/Ks ratio <1 suggesting their evolution under purifying selection involving no divergence in encoded amino acids. Results of this study suggested that after divergence from a common ancestral genome the common syntenic features maintained between genomes of wheat and brachypodium
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
Abnormal meiosis in hexaploid Setaria verticillata
No full textThis article does not have an abstract
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
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