1,720,985 research outputs found
Morphological, chemical and genetic diversity of wild myrtle (Myrtus communis L.) populations in Sicily
No full textMyrtus communis L. is a shrub widespread in the Mediterranean area. The interest in this species is growing, mainly due to
its pharmacological and aromatic properties. The overexploitation of wild populations induced increasing degradation of plant cover
with serious risk of loss of genetic diversity. This research explored the morphological, chemical, and genetic diversity of wild myrtle
populations in Sicily, with the aim to provide a first characterization of a core collection of 36 accessions from 7 localities for future
domestication programs. Amplified fragment length polymorphism fingerprinting generated 152 polymorphic fragments. STRUCTURE
analysis identified three genetic clusters (A, B, and C) corresponding to specific geographical origin. Analysis of molecular variance
estimated a quite high overall fixation index (FST = 0.332). Misilmeri and Ispica were the more divergent populations (FST = 0.502),
while M. Pellegrino and Scopello revealed the lowest FST (0.153). The relationships between genetic, morphological, and biometric
data were investigated. Significant correlation between genetic clusters and bush shape/plant growth behavior was found (P < 0.005).
Moreover, morphological traits such as leaf, fruit, and seed size were significantly correlated to Clusters B and C. Leaves’ secondary
metabolite profiles were evaluated based on antioxidant activity and total tannin and phenol concentrations. High antioxidant activity
differences were recorded using DPPH (21.4–35.5 mmol Trolox/100 g DW) and ABTS (24.2–39.5 mmol Trolox/100 g DW) methods.
A low variability was observed among populations regarding phenol (2466–3800 mg catechin equivalents/100 g DW) and total tannin
contents (93.9–262.3 mg catechin equivalents/100 g DW). Results indicated that multiple approaches based on genetic, morphological,
and chemical traits might allow the characterization of natural myrtle diversity
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
I Parchi Regionali Siciliani sul sentiero dell'Internazionalizzazione - Un sistema per la valorizzazione delle attività turistiche e della sostenibilità
No full textIl lavoro, articolato in due parti, ha come obiettivo quello di fornire uno strumento operativo per la valorizzazione e la promozione dell’offerta turistica, e in particolare eco-turistica, con una specifica attenzione al mercato estero.
L’utente finale che auspichiamo, è un non ancora esistente Sistema dei Parchi Siciliani, per la cui creazione speriamo risultino utili i contenuti di questa pubblicazione.
Nella Parte Prima, sono stati analizzati alcuni dei principali mercati turistici esteri in relazione all’offerta turistica siciliana, con lo scopo di individuare le potenzialità offerte da ciascun Paese. Nello specifico per ognuno dei paesi scelti, sono state raccolte informazioni in merito al movimento turistico, con particolare riferimento al profilo del turista, ai collegamenti, ai principali canali di promozione etc.
Nella Parte Seconda vengono quindi individuati i fattori critici di successo per l’internazionalizzazione dei Parchi in un’ottica di sistema.
Per ognuno dei fattori individuati è stata fatta un’analisi della situazione attuale dei Parchi Regionali Siciliani,Alcantara, Etna, Madonie e Nebrodi
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
Sicilian myrtle diversity: evaluation of leaf total phenols content and antioxidant properties
No full textMyrtle (Myrtus communis L.) is an aromatic plant spontaneously growing and increasingly cultivated in Mediterranean area. Recently, interest on myrtle plant is growing due to the pharmacological and antioxidant properties since myrtle leaves are important sources of phenolic and antioxidant compounds with health-promoting effects. Plant genotype is the primary factor affecting antioxidant activity and phenol content. For this reason, a core collection of local selected myrtle accessions from Sicily was evaluated with the aim to identify genotypes with high antioxidant value. Thirty-six myrtle individuals belonging to seven populations were studied for leaf total phenols, tannins and antioxidant activity. Results of quantitative determination of total phenols, tannins and antioxidant activity measured with two protocols (DPPH and ABTS radical scavenging activity) revealed a high variability of myrtle genotypes for these parameters. Leaves of the accession MTR11 belonging to Scopello population had the highest total phenol content as catechin equivalents (5495 mg CE 100 g-1 dw) and the highest antioxidant activity (DPPH: 53.7 mmols Trolox 100 g-1 dw; ABTS: 61.6 mmols Trolox 100 g-1 dw). On the contrary, the lowest phenols content (1540.7 mg CE 100 g-1 dw) and the lowest antioxidant activity (DPPH: 13.9 mmols Trolox 100 g-1 dw; ABTS: 16.7 mmols Trolox 100 g-1 dw) were determined in the genotype MTR7 belonging to Zingaro population. The concentration of tannins in the leaves of myrtle analyzed ranged from 78.3 mg CE 100 g-1 dw to 356.9 mg CE 100 g-1 dw, in MRT7 of Zingaro and in 2MRT6 of Misilmeri populations respectively
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