1,720,955 research outputs found
Valutazione dell’impatto di biostimolanti a base di tannino sulla crescita di barbatelle di vite
No full textScopo della ricerca
Valutazione dell’uso del tannino di Castanea sativa, come biostimolante, per l’ottenimento di barbatelle di alta qualità.
Materiali e metodi
L’esperimento è stato condotto in Sicilia presso il vivaio Giacomo Mannone, su talee della cv Zibibbo/1103 P, utilizzando estratti acquosi di tannino da Castanea sativa ottenuti a diverse temperature di estrazione (45, 60 e 75°C). In fertirrigazione, su quattro repliche (20 innesti/talea) a blocchi randomizzati, si è somministrato in forma pura (T100%), diluito al 25% (T75%) e 50% (T50%), il tannino estratto a diverse temperature (CTRL, T40, T60 e T75). Le valutazioni eco-fisiologiche sono state condotte a 41, 55, 71 e 91 giorni dopo l’impianto. All’estirpazione (228 giorni), le barbatelle sono state caratterizzate in termini di lunghezza, peso fresco e secco dei germogli e delle radici, quest’ultime ripartite in classi, in funzione del loro diametro (Classe 1= ∅ ≤ 1 mm; Classe 2= 1 <∅ ≤ 2 mm; Classe 3= 2< ∅ ≤ 3 mm; Classe 4= ∅ >3 mm).
Principali risultati
Il trattamento con tannino ha favorito la crescita sia delle radici fini sia dell’intera parte epigea della pianta, oltre a mostrare il maggiore contenuto di clorofilla nelle foglie.
Conclusioni
I risultati suggeriscono che il trattamento con tannino, indipendentemente dalla temperatura di estrazione e della diluizione di utilizzo, ha un impatto sullo sviluppo dell’apparato epigeo e ipogeo di barbatelle innestate, fornendo importanti informazioni per l'ottimizzazione delle pratiche di vivaio e la produzione di materiale viticolo di alta qualità
Analisi non distruttiva del peso del legno di potatura attraverso l'impiego dell’analisi di immagini
No full textScopo della ricerca
Sviluppare una metodologia di analisi d’immagini per la stima non distruttiva del peso del legno di potatura.
Materiali e metodi
Lo studio è stato condotto nel 2023 su 175 piante di quattro varietà di vite da vino (Catarratto, Merlot, Nero d’Avola e Tannat) allevate a controspalliera e potate a cordone speronato. Durante il riposo vegetativo, sono state acquisite in campo immagini da entrambi i lati della canopy, durante tre diversi momenti del giorno (mattina, mezzogiorno, pomeriggio), sfruttando due differenti modalità di acquisizione (frontale con sfondo artificiale; dal basso senza sfondo). Le immagini sono state successivamente pre-processate attraverso il software opensource FIJI/ImageJ® ed analizzate tramite un algoritmo di apprendimento automatico per classificare gli elementi presenti nelle immagini in classi diverse in base a caratteristiche visive simili, come colore, forma e struttura. Le immagini sono state quindi segmentate e da esse è stata estratta la classe relativa ai tralci ed il numero di pixel relativo è stato calcolato. Questo è stato quindi correlato al peso del legno di potatura.
Principali risultati
I risultati indicano che acquisire le immagini attraverso specifiche modalità migliora i processi di segmentazione e stima del peso del legno; l’uso dello sfondo artificiale può essere scongiurato attraverso la semplice inclinazione della fotocamera; la componente cultivar non sembrerebbe rappresentare una limitazione.
Conclusioni
Questo approccio potrebbe apportare benefici nell'automazione dei processi di gestione del vigneto
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
Biodiversity in Grapevines: Unveiling the Potential of Ancient Sicilian Cultivars and Biotypes of Key Indigenous Varieties
No full textThe biodiversity of grapevines, crucial for viticulture, encompasses over 10,000 cultivars
listed in the International Catalogue of Grapevine Varieties (VIVC). This diversity,
categorized into biotypes and clones, gives rise to intra-varietal variations, ranging from
minor morphological changes to macroscopic alterations, influencing adaptability and
wine quality. Historical factors, such as the 19th-century Phylloxera epidemic in Europe,
resulted in the dominance of a limited number of Vitis vinifera L. genotypes. However,
renewed interest in ancient local cultivars and biotypes has emerged due to pressures
linked to climate change. Intra-varietal diversity is now recognized for its potential to
maintain grape quality under adverse climatic conditions. In 2023, the agronomic
potential of ancient Sicilian varieties (Lucignola and Vitrarolo) and the biotypes of the
main indigenous cultivars (Grillo, Catarratto, Nero d'Avola, Perricone, Frappato, Nocera)
was assessed in four experimental vineyards located in different regions of Sicily
(Western, Central, and Eastern). The study assessed the "genotype x environment"
interactions, comparing biotypes regardless of the environment. The genotypes shared
the same spacing, training system, and pruning method, under irrigation. Ten vines were
chosen randomly for each genotype, serving as biological replicates. Phenological
stages, recorded independently for each vine, represented the percentage of buds at
each stage. For each genotype, the progress of grape ripening, berry weight, vegetative
growth, and water status were evaluated. At harvest, the yield per vine and the number
of bunches were recorded, and their ratio was used to calculate the average bunch
weight. During winter, the pruning wood weight was measured and the Ravaz index was
calculated. Our results show that grape ripening depends on environmental conditions,
and vines show different water status levels. Lesser-used grape genotypes may hold
promise for adapting to climate change, serving as tools for preserving typical grape
characteristics, but is needed further investigation
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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