1,720,967 research outputs found
Effetto dell’etilene in post-raccolta su processi metabolici di uve Sangiovese in maturazione.
No full textLa radiazione UV-B influenza l’accumulo di carotenoidi nel frutto di pomodoro mediante meccanismi sia dipendenti che indipendenti dall’etilene
No full textPolyphenols content in salinized seedlings of the halophytic legume Prosopis strombulifera
No full textBiosintesi di fenoli in uve da vino durante l’appassimento effettuato tramite trattamenti con CO2, etilene ed a differenti temperature
No full textAttività di enzimi legati al "softening" e contenuto di metaboliti secondari in uva Trebbiano sottoposta a brevi trattamenti con CO2 gassosa in post raccolta
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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
Ethylene treatments on harvested grape berries: physiological responses and effects on wine composition
No full textIn this study, we elucidated how ethylene post harvest treatments may affect grape metabolism and the resulting wine. key categories of secondary metabolites have been analyzed in berries after 24 and 36 h of treatments, and after two days from the end of treatment. In berries, ethylene was shown to increase anthocyanins already after 24h, whereas total phenols, flavonoids, condensed tannins, anthocyanins and tartaric esters increased at 36 h. Ethylene appeared to stimulate the degradation of carotenoids and a progressive increase of the content of norisoprenoids. Chemical analyses were integrated with target gene expression analyses performed at 24 h of treatment. Two key genes, encoding aphenyl ammonia lyase (PAL) and an expansinA were upregulated in ethylene-treated berries. Considering cell wall metabolism, the activity of both pectin-methyl esterase and beta-glucosidase were enhanced in ethylene-treated berry skins, thus eventually affecting the vinification process (extraction of metabolites from the skins) and the composition of the resulting wines. Indeed, in the wine obtained from ethylene-treated berries, higher concentrations of specific phenol compounds belonging to the classes of flavonols, anthocyanins, flavan-3-ols, and stilbenes, were detected. Ethylene induced a significant change in the wine aroma profile by increasing free volatile categories, such as phenols and fatty acids, and reducing the content of carbonyl compounds and, in particular, of esters. Less pronounced differences between control and ethylene-treated wines were observed in terms of glycoside-bound volatile compounds. Results indicate that postharvest treatments with ethylene on grapes are effective in modulating specific metabolic processes of the berries, resulting in wines with increased concentration of specific polyphenol classes and some changes in the aroma profil
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