1,720,989 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
Oxylipins are not required for R gene-mediated resistance in potato
No full textThe role of 9- and 13-lipoxygenase-derived oxylipins for race-cultivar-specific resistance in potato was analyzed by expressing RNA interference constructs against oxylipin biosynthetic genes in transgenic potato plants carrying the resistance gene R1 against Phytophthora infestans. Down-regulation of 9-lipoxygenase expression resulted in highly reduced levels of 9-hydroxyoctadecatrienoic acid after treatment with the pathogen-associated molecular pattern Pep-13. However, neither 9-lipoxygenase nor 9-divinyl ether synthase RNAi plants exhibited alterations in their resistance to P. infestans. Similarly, successful down-regulation of transcript accumulation of the 13-lipoxygenase pathway genes encoding allene oxide cyclase, 12-oxophytodienoic acid reductase 3 and the jasmonic acid receptor coronatine-insensitive 1 resulted in highly reduced levels of jasmonic acid after Pep-13 treatment. Race-cultivar-specific resistance, however, was not lost in these plants. Our results suggest that neither 9-lipoxygenase-derived oxylipins nor jasmonic acid are required for R-gene-mediated resistance in potato. Importantly, in tobacco, the silencing of 9-lipoxygenase expression was previously demonstrated to suppress race-cultivar-specific resistance. Thus, we conclude a differential requirement of oxylipins for R-gene-mediated resistance in different solanaceous plants.Deutsche Forschungsgemeinschaft [SFB 648, TP A4
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
Microsatellite Development and Application in Pigeonpea (<i>Cajanus cajan </i>(L.) Millsp.)
Get PDFPigeonpea is a major legume crop grown in the semi-arid tropics but has been relatively neglected in terms of genomic research. This study aimed at developing molecular markers as a basic requirement towards initiating marker assisted breeding techniques in pigeonpea. Simple Sequence Repeat (SSR) loci of pigeonpea were isolated by screening non-enriched (library A) and enriched (library B) partial genomic libraries with SSR probes. Positive clones were sequenced and primers designed for 152 microsatellite loci, 39 from library A and 113 from library B. Optimisation of reaction conditions was achieved for 51% and 65% of primers designed from library A and B, respectively. For the purpose of exploiting the transferability of SSRs across genera within the legume species, 220 soybean primers were tested in pigeonpea, 39 of which amplified interpretable bands. Nineteen out of 20 amplified primers from library A were polymorphic among 15 cultivated and 9 wild species. The diversity analysis revealed contrasted levels of variability within cultivated and wild accessions. A total of 98 alleles were detected at the 19 polymorphic loci with an average of 4.9 alleles per locus while the observed heterozygosity ranged from 0.17 – 0.80 with a mean of 0.42 per locus. Substantially less allelic variation (31 alleles) was observed within the cultivated species than across the wild species (92 alleles). Primers from library B were not tested for amplification in wild species but 35 out of the amplified 73 revealed polymorphism among 24 pigeonpea genotypes. The number of alleles detected ranged from 2 to 6 with a total of 110 alleles and an average of 3.1 alleles per locus. Only one of the 39 amplified soybean primers revealed polymorphism among 24 cultivated pigeonpea accessions. No significant relationship was detected between the class of repeats and heterozygosity values. AT and TG class of repeats were the most abundant di-nucleotide repeats in library A and B respectively while TAA and GAA were the most abundant trinucleotide repeats in both libraries. Protein database searches provided putative functions for 21 SSR-containing pigeonpea sequences that would be useful in functional marker development. UPGMA and MDS cluster analysis revealed genetic relationships among recently bred varieties, old varieties and wild accessions. Nine of the markers developed were polymorphic to the parental lines of a F6 Fusarium wilt RIL mapping population that had been developed by ICRISAT breeders. Analysis of allele segregation in the RIL population revealed that all the 9 SSRs segregated in the expected 1:1 ratio and were further tested for any possible linkage with a QTL for resistance to Fusarium wilt. All the polymorphic markers derived from this study are now being used for characterisation and evaluation of pigeonpea germplasm collection at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) headquarters, India. SSRs provide a powerful tool for genomic studies and are recommended for systematic fingerprinting of pigeonpea germplasm
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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