1,720,967 research outputs found
Metodologie citologiche avanzate per il trasferimento di geni di resistenza a stress biotici in Solanum sp. e Triticum sp
No full textMetodologie citologiche avanzate per il trasferimento di geni di resistenza a stress biotici in Solanum sp. e Triticum sp
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Metabolic profiling of rachis and grain tissues of durum wheat-Thinopyrum germplasm harboring Fhb7E, a major Fusarium Head Blight resistance locus from Th. elongatum
No full textRecent introgression of a major resistance locus, Fhb7E, from the wild Thinopyrum
elongatum into bread and durum wheat (DW) showed over 90% decrease of severity of
Fusarium Head Blight (FHB) disease. Being effective in different species/backgrounds,
Fhb7E offers the way of reaching ample and durable FHB resistance within cultivated
germplasm, thus minimizing yield loss and mycotoxin accumulation in grains. Yet, due to
the complexity of plant-pathogen interaction and a multigenic host control, understanding
of plant strategies against FHB associated with Fhb7E is still incomplete. By using a
recombinant DW with a small Th. elongatum chromosome 7E region including Fhb7E on
its 7AL arm, we analysed via untargeted metabolomics rachises and grains upon spike
inoculation with Fusarium graminearum (Fg) and water. Rachis confirmed to be the key
structure where a main metabolic shift occurs differentiating susceptible vs resistant
plants. Fhb7E conferred constitutive and early-induced defence response by up-regulating
pathways involved in antioxidant activities, cell wall reinforcement and sugar metabolism.
Higher accumulation of flavonoids, phenylpropanoids, terpenoids, and peptides in the
resistant Fhb7E-carrier line vs control was observed. Fg-induced response also newly
highlighted specific importance in Fhb7E-resistance of polyamine biosynthesis, glutathione
and vitamin B6 metabolisms, as well as the presence of multiple routes for deoxynivalenol
(DON) detoxification. DON was mainly de-epoxidated via conjugation with glutathione, but
also largely glycosylated. The results highlight a complex interplay between finely tuned
metabolic pathways and specific metabolites at the basis of the outstanding resistance
controlled by Fhb7E
Deoxynivalenol detoxification in transgenic wheat confers resistance to fusarium head blight and crown rot diseases
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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
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
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