1,720,998 research outputs found
THE GENETICS OF CHILLING REQUIREMENT IN APRICOT (\u3ci\u3ePRUNUS ARMENIACA\u3ci\u3e L.)
No full textCommercial production of apricot is severely affected by sensitivity to climatic conditions, an adaptive feature essential for cycling between vegetative or floral growth and dormancy. Yield losses are due to either late winter or early spring frosts or inhibited vegetative or floral growth caused by unfulfilled chilling requirement (CR). Studies in this dissertation developed the first high-density apricot linkage map; followed by a comparative mapping strategy to validate conservation of synteny, genome collinearity and stable quantitative trait loci (QTLs) controlling CR and bud break between apricot and peach; and ultimately attempt to identify key candidate genes following a linkage disequilibrium-based association mapping approach to fine map the major CR QTL genomic regions. Following a two-way pseudotestcross mapping strategy, two high-density apricot maps were constructed using a total of 43 SSR (Simple Sequence Repeats) and 994 AFLP (Amplified Fragment Length Polymorphism) markers that span an average of 502.6 cM with an average marker interval of 0.81 cM. Twelve putative CR QTLs were detected using composite interval mapping, a simultaneous multiple regression fit and an additive-by-additive epistatic interaction model without dominance. An average of 62.3% ± 6.3% of the total phenotypic variance was explained. We report QTLs corresponding to map positions of differentially expressed transcripts and suggest candidate genes controlling CR. A majority of the QTLs were shown to be stable between both Prunus species, as well as similar trends in their QTL effects, with the allele for increasing the trait value mostly originating from the high chill parents. The denser apricot maps, due to more AFLP marker polymorphisms, provide a higher resolution to delineate QTLs to smaller genomic intervals, as well as splitting each of some of the peach QTLs into two. The comparative QTL mapping strategy presented here reveals the transferability of genetic information between two Prunus species, the characterization of stable QTLs, the utility of the maps to consolidate each other and to further validate previously identified CR QTL loci as a major controlling factor driving floral bud break. The LD-based association mapping was limited to marker dense genomic regions within and around previously detected major QTLs on linkage group (LG) 1 and 7. LD decayed below the centimorgan scale, indicating insufficient marker density averaged at 0.44 and 1.58 cM on LG1 and 7, respectively. Denser marker regions averaged at 0.1 and 0.7 cM on LG1 and 7, respectively, revealed significant LD estimates above the baseline threshold. We report significant marker-trait associations and underlying genes the markers were derived from. Our results demonstrate that an LD-based association mapping can be used for validating QTLs, fine mapping and detecting CGs in Prunu
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
The Sweetpotato Genome
Get PDFThis open access book is a compilation of advances in sweetpotato genomics, which have been used to improve our understanding of the evolution of sweetpotato, increase our knowledge of crop growth and development, and provided critical information required for genomic-assisted breeding in sweetpotato. Sweetpotato is a critical food staple for millions of people in the developing world that has long been considered an under-resourced, orphan crop. However, this perception is changing, and significantly, more resources have been devoted to the improvement of sweetpotato in both the private and public sectors around the world during the last decade. Its twelve chapters review the changing food security and commercial food product landscape of sweetpotato in the developed and developing world, global wild and cultivated genome sequencing efforts in sweetpotato, the evolution of molecular markers and the development of novel polyploid linkage mapping, quantitative trait loci and genomic selection strategies required for gene discovery in this complex crop, and the use of these new tool in sweetpotato crop improvement programs around the globe. This book is useful to students, teachers, and scientists in universities, research institutes, and private companies
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
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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