1,721,066 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
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Genome-Wide Analysis of Phytophthora cactorum Resistance and Fruit Quality Traits in Cultivated Strawberry (Fragaria x ananassa)
Full text linkThis thesis explores advanced strategies to enhance strawberry breeding by applying genomic prediction, harnessing underutilized genetic diversity, and investigating key genetic mutations affecting fruit quality traits. The first chapter focuses on enhancing strawberry resistance to Phytophthora crown rot (PhCR), a soil-borne disease that thrives in warm, wet conditions and severely impacts yields. It addresses the limited genetic gains in breeding for PhCR resistance and the discovery of a significant locus, RPc2, which explains a substantial portion of genetic variance. Incorporating underutilized gene bank resources doubled additive genetic variance and improved genomic prediction accuracy, highlighting the potential of genomic selection for enhancing PhCR resistance.The second chapter further solidifies the success of these strategies, evaluating the use of useful heterosis and genomic prediction to improve fruit quality traits and shelf life in strawberries. It examines the introgression of favorable alleles from exotic genetic resources into elite breeding pools, resulting in significant improvements in total soluble solids and titratable acidity. The study not only highlights the genetic correlations among fruit traits and the impact of genotype combinations on hybrid performance but also underscores the importance of genomic prediction in efficiently selecting superior genotypes and optimizing breeding programs.The third chapter investigates the domestication of strawberry for improved fruit firmness and shelf life. It identifies a loss-of-function mutation in the polygalacturonase gene PG1-6A1, significantly increasing fruit firmness and reducing perishability. This mutation and several structural variants have been positively correlated with fruit firmness and negatively with gene expression. Developing high-throughput genotyping assays for these mutations facilitates marker-assisted selection, enabling the breeding of firmer and longer-lasting strawberry cultivars.Collectively, these studies provide valuable insights into the genetic basis of key traits in strawberries and showcase the potential of genomic technologies to accelerate breeding efforts and improve fruit quality and disease resistance
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Genetic Basis of Resistance to Fusarium Wilt of Strawberry
No full textFusarium wilt of strawberry, caused by the soil-borne fungal pathogen Fusarium oxysporum f. sp. fragariae (Fof), is a devastating pathogen threatening the $2.3 billion US strawberry production industry. Fof is a member of the Fusarium oxysporum species complex composed of host-specific strains of F. oxysporum, which collectively infect more than 100 different hosts; this broad host range earned the species fifth place on a list of most important plant-pathogenic fungi. Fof was first identified in Australia in 1962 and has since spread across Asia, North America, and Europe. Pathogenicity of Fof isolates evolved separately at least three times and largely due to horizontal transfer of lineage-specific chromosomes. Fof infects strawberry roots and extensive hyphal colonization of the vasculature, coupled with the plant's defense mechanisms, leads to symptoms such as chlorosis, wilt, and ultimately death. Fumigation is no longer a viable control method for Fof, thus presenting a need for genetic sources of resistance to the pathogen. Five loci conferring resistance to Fof have been previously identified, FW1 - FW5, although the underlying resistance genes are unknown. In this study, I identified candidates for the FW1 resistance gene. By assembling and mapping FW1 in a resistant genome, I narrowed down the FW1 locus to a 1.8Mb region on chromosome 2B. I identified two strong FW1 candidate genes, a TIR-type NLR and a receptor protein, that are significantly differentially expressed between resistant and susceptible individuals. In addition, I identified two novel resistance loci, FW6 and FW7, from the heirloom cultivar 'Earliglow.' Due to haplotype similarity and genealogy, FW6 may be the previously identified resistance gene FW2. FW6 and FW7 exhibit classic statistical epistasis where FW6 is a dominant resistance allele masking the effect of FW7 which acts as an additive allele in a population lacking FW6. In summary, Fof is a highly concerning pathogen capable of evolving to overcome resistance, and my research has identified resistance gene candidates and mapped novel genetic sources of resistance to help combat this pathogen
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
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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