1,720,970 research outputs found
Numerical taxonomy of Italian maize populations. Genetic distances on the basis of heterosis effects.
No full text
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
Valutazione di strategie di campionamento per la determinazione della struttura genetica di popolazioni forestali.
No full textTranscript analysis of stress defence genes in a white poplar clone inoculated with the arbuscular mycorrhizal fungus Glomus mosseae and grown on a polluted soil
No full textTranscriptome changes in the cambial region of poplar (Populus alba L.) in response to water deficit
No full textDifferential expression of poplar superoxide dismutase and ascorbate peroxidase genes in response to drought in cambium and leaves of Populus alba v. Villafranca
No full textInheritance of glyphosate tolerance among maize somaclones
No full textTwo families derived from a maize somaclone previously found to tolerate the exposure to 2.4 mM (0.2 kg a.i. in 400 1 ha -1 of water) glyphosate were evaluated genetically for herbicide tolerance. The lines were self-crossed and crossed with three inbred genotypes showing significant variation in tolerance to the herbicide. Seedlings of the families this way obtained were evaluated in a growth chamber following a treatment with 2.4 mM glyphosate at the three-leaf stage. Visual injury rating, dry weight, shoot height and carbon-exchange rate were scored two weeks after the application of the herbicide. General combining ability effects were significant, suggesting that additive gene action is important in conferring tolerance to glyphosate. Tile results strengthen the possibility that additional factors, not related to the properties of the main target of herbicide action, the activity of the shikimate pathway enzyme 5-enol-pyruvyl-shikimate-3-phosphate synthase, may provide the basis f..
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
- …
