1,721,006 research outputs found
Caratterizzazione del potenziale fenolico e profilo antocianico di vitigni a bacca nera coltivati in Toscana e relativa attività antiradicalica
No full text
Catechin, epicatechin, quercetin, rutin and resveratrol in red grape: Content, in vitro antioxidant activity and interactions
No full textThe extracts obtained from skin and seeds of 10 native Tuscan and international Vitis vinifera varieties
were evaluated for their antioxidant activity, total phenolic and anthocyanin content and subjected to
HPLC–UV analysis to quantify the content of five phenolic constituents of biological interest: catechin
and epicatechin in seeds and quercetin, rutin and resveratrol in skin extracts. The antioxidant activity of
the extracts and pure compounds was assessed by means of two different in vitro tests: scavenging of
the stable DPPHd radical and of authentic peroxynitrite (ONOO). All the extracts showed significant
antiradical capacity: Merlot skin was most active towards both radicals. All the five phenols investigated
possessed strong antiradical activity. Quercetin, catechin and epicatechin showed maximum activity
(respectively, IC50ðDPPHdÞ 5.5, 6.7 and 6.8 mM, IC50ðONOOÞ 48.8, 55.7 and 56.7 mM). Potential antiradical
interactive effects among the five compounds were also investigated and results indicated possible
synergy between quercetin, rutin and resveratrol towards ONOO. The effect was additive for catechin
and epicatechin
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
Valorizzazione del germoplasma viticolo del comprensorio di Pitigliano (Grosseto)
No full textPer definire adeguatamente cosa si intende per vitigno minore sarebbe necessaria una una complessa analisi che tenga conto della diffusione, dell’utilizzo in vinificazione, della qualità che è in grado di esprimere e dell’importanza economica nel mercato del vino, argomenti che sono stati ampiamente illustrati in precedenza da Calò (1993) e Zonin (1993).
Nella presente trattazione, pertanto, vengono esaminati soltanto quei vitigni la cui presenza in questo territorio è testimoniata da lungo tempo, che si ritengono meritevoli di attenzione per un migliore e più razionale utilizzo delle loro potenzialità con la consapevolezza che nel ricco germoplasma viticolo toscano, ancora in corso di descrizione e di valutazione possano esistere vitigni altrettanto degni di attenzione per una reintroduzione in coltura.
Sono state condotte osservazione dal punto di vista sanitario (presenza di affezioni virali), ampelografiche e tecnologiche nell’arco di un decennio, sul vigneto di collezione realizzato a Pitigliano (gr)
Per quanto concerne i vitigni iscritti al catalogo delle varietà di vite, carenti o sprovvisti di cloni omologati, si evidenza la necessità, di operare un lavoro di selezione genetica e sanitaria, in parte già iniziato dalle Istituzioni di ricerca, e di valutare la possibilità di espansione della loro coltivazione valutando ulteriormente le loro caratteristiche agronomiche e tecnologiche
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
- …
