1,720,962 research outputs found
Caratterizzazione e valutazione di vitigni tradizionali emiliani: analisi dei profili antocianico ed aromatico
No full textCaratterizzazione e valutazione di vitigni tradizionali emiliani: analisi dei profili antocianico ed aromatic
Ampelographic and chemical characterization of local grapes for ‘saba’ and ‘agresto’ in Reggio Emilia and Modena (Northern Italy)
No full textBACKGROUND ‘Saba’ and ‘agresto’ are traditional Italian products both based on unfermented grape juices that are concentrated by heating. The former is obtained from ripe grapes and the latter from unripe grapes. In this work, we have characterized the main red-skinned (Ancellotta, Fortana, Lambrusco di Sorbara, Lambrusco grasparossa, Lambrusco salamino and Uva Tosca) and white-skinned (Lugliatica, Spergola, Trebbiano di Spagna and Trebbiano modenese) cultivars used for ‘saba’ and ‘agresto’ production, focusing on the variability expressed by ampelographic traits, physical and chemical parameters and anthocyanin profile.
RESULTS The cultivars examined were effectively discriminated on the basis of their different composition profile by analysis of variance and principal component analysis. In particular, a peculiar anthocyanin profile was traced by absolute and relative values for each cultivar. The identification of the main anthocyanins of some local cultivars, their chemical characterization and their ampelographic description were one of the main achievements of this work.
CONCLUSION The use of red grapes to obtain ‘saba’ seems more rational for the presence of higher amounts of antioxidant substances. Ancellotta showed several factors interesting for ‘saba’ production, such as the very high anthocyanin content, including anthocyanin antioxidants. A more detailed investigation on ‘agresto’ technology is required
Studio dei profili delle sostanze aromatiche glicosilate di vitigni (Vitis vinifera L) autoctoni dell’Emilia Romagna
No full textResearch on the glycosylated fraction of volatiles aims to investigate the mostly unexpressed aromatic potential of a grapevine. This reservoir of aromatic molecules is partially released during the production and aging of the wine and targeted technological interventions would allow the enhancement of the non aromatic grapevines. The analysis of eleven cultivars and accessions grown in Reggio Emilia highlighted that, apart from Malvasia di Candia aromatica, already studied for its rich component of monoterpenic compounds, Trebbiano di Spagna showed, as well, a very interesting profile with the presence of high concentrations of some monoterpenic alcohols. The other cvs showed a higher homogeneity of composition and a general lack of flavor with a few exceptions
Study of anthocyanin profile for valorization of autochthonous grapevine (Vitis vinifera L.) cultivars of the Emilia Romagna region
No full textGrapevine (Vitis vinifera L.) is a crop of major economical interest in Italy and it is largely grown in the plains and hills of Reggio Emilia and Modena (Emilia Romagna Region, northern Italy). Grapes are mainly used for wine production and table consumption, as well as for other minor processed products. Among these latters, ‘saba’ and ‘agresto’ are traditional Italian products both based on unfermented grape juices that are concentrated by heating. The concentration by heating is a process also used for manufacturing fermented products, such as traditional balsamic vinegars and ‘vino cotto’ of the Marche region.
The study of polyphenolic substances plays a primary role in oenology, in particular to define the sensory properties of the wine and to deepen the chemical and physical processes that occur during wine aging.
In addition, the anthocyanin composition of red grapes is also a phenotypic trait distinctive of the individual grapevine cultivar and its determination can be used as a marker for the evaluation of grape authenticity and wine adulteration.
The purpose of this study is the characterization of anthocyanin composition of some grape varieties and accessions of Emilia Romagna (Northern Italy) in order to outline the individual profiles by qualitative and quantitative approach.
These data will contribute to the implementation of “Italian Vitis Database” (http://www.vitisdb.it), in a project called “An Italian Vitis database with multidisciplinary approach for exploitation and valorization of the regional genotypes” funded by AGER Agroalimentare e Ricerca
Studio delle sostanze polifenoliche per la valorizzazione di vitigni autoctoni (Vitis vinifera L) dell’Emilia Romagna
No full textThe study of polyphenolic substances plays a primary role in winemaking, particularly in defining the sensory properties of the wine and the chemical and physical processes that occur during wine aging. The anthocyanin composition of red grapes is also a phenotypic trait distinctive of the individual cultivar and its determination can be used as a marker for the evaluation of grapes authenticity and of wine adulteration. This study was a first approach to the characterization of the anthocyanin composition of 27 accessions of Emilia Romagna (Northern Italy), highlighting a variability that could contribute to enhance wines and identify potential food fraud
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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