1,720,973 research outputs found
La riscoperta della cicerchia (Lathyrus sativus L.) come coltura tradizionale.
No full textAtti del IV Congresso Nazionale. CNR Sassari/Oristano. Carlo Delfino Editor
Conservazione delle risorse genetiche agrarie nell’ambito della valorizzazione dell’agricoltura italiana.
No full textMolecular characterization of emmer (Triticum dicoccum) landraces from central Italy
No full textEmmer (Triticum dicoccon Schrank,2n = 4x = 28) is a hulled wheatspecies [more] widely spread in the Mediterranean basin. In Italy it survives as acrop in a few marginal areas and peculiar ecological niches in different regionsof central and southern Italy. A renewed interest has occurred during the lastdecade toward local varieties belonging to this species. As a matter of fact,local varieties have the highest genetic variation and adaptation to the naturaland anthropological environment from where they originated. Results on thegenetic diversity within and relationships among 11 Italian local varieties ofemmer as assessed with 17 RAPD marker loci are here reported. The proportion ofthe among-local variety genetic diversity was as high as 48% (GST =0.479). Thus, about 52% of the total variation was within population. Localvarieties of emmer proved to be formed by a variable number of lines geneticallydistinguishable from each other, and the vast majority of individuals overpopulations proved to be different multilocus genotypes. Landraces of emmer fromcentral and southern Italy showed distinctive molecular traits. In particular,local varieties classified as «Central Italy» types were characterized by a common set of RAPD marker alleles and proved to bedistinguishable from both the «Southern Italy» and the«Garfagnana» accessions. The overall results confirm the highvariability that can be found within landrace populations, underlining thevalues of landraces as an irreplaceable bank of genetically diversified andhighly co-adapted genotypes. Information for an appropriate insitu conservation and management of this valuable source of emmergermplasm is discussed
Molecular characterization of emmer (Triticum dicoccon Schrank) Italian landraces
No full textEmmer (Triticum dicoccon Schrank, 2n = 4x = 28) is a hulled wheat species [more] widely spread in the Mediterranean basin. In Italy it survives as a crop in a few marginal areas and peculiar ecological niches in different regions of central and southern Italy. A renewed interest has occurred during the last decade toward local varieties belonging to this species. As a matter of fact, local varieties have the highest genetic variation and adaptation to the natural and anthropological environment from where they originated. Results on the genetic diversity within and relationships among 11 Italian local varieties of emmer as assessed with 17 RAPD marker loci are here reported. The proportion of the among-local variety genetic diversity was as high as 48% (GST = 0.479). Thus, about 52% of the total variation was within population. Local varieties of emmer proved to be formed by a variable number of lines genetically distinguishable from each other, and the vast majority of individuals over populations proved to be different multilocus genotypes. Landraces of emmer from central and southern Italy showed distinctive molecular traits. In particular, local varieties classified as «Central Italy» types were characterized by a common set of RAPD marker alleles and proved to be distinguishable from both the «Southern Italy» and the «Garfagnana» accessions. The overall results confirm the high variability that can be found within landrace populations, underlining the values of landraces as an irreplaceable bank of genetically diversified and highly co-adapted genotypes. Information for an appropriate in situ conservation and management of this valuable source of emmer germplasm is discussed
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
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