1,720,958 research outputs found
Attività Antiossidante e Colore di Mieli Unifloreali e Multiflorali della Regione Marche.
No full textIl miele è uno degli alimenti più complessi prodotto dalle api (Apis mellifera L.) utilizzando il nettare fornito dai fiori o le secrezioni di alcune piante e insetti.
Negli ultimi anni sta crescendo l’interesse nei confronti degli antiossidanti naturali, presenti negli alimenti, utilizzati come protezione efficace contro il danno ossidativo. Tra questi, i composti fenolici presenti nei mieli (soprattutto flavonoidi) costituiscono uno dei gruppi più importanti per le loro proprietà funzionali e preventive. Tuttavia, l'attività antiossidante dei mieli varia notevolmente a seconda dell’origine botanica a causa dell’elevata diversità strutturale dei derivati polifenolici che le api, quando raccolgono il nettare o la melata trasferiscono dalla pianta al miele.
Considerando quindi il crescente interesse commerciale per la produzione di mieli uniflorali dovuto all'attenzione dei consumatori per le loro proprietà salutistiche e le diverse caratteristiche organolettiche, abbiamo analizzato il contenuto totale di polifenoli (TPC), l’attività antiossidante (saggi DPPH e ABTS) e il colore (test spettrofotometrico e comparatore ottico) di diversi mieli associati alla loro origine botanica.
Sono stati analizzati 123 mieli, 91 millefiori e 32 uniflorali tra cui: girasole (Helianthus annuus L.), robinia (Robinia pseudoacacia L.), castagno (Castanea sativa L.), coriandolo (Coriandrum sativum L.), tiglio (Tilia spp. L.) e melata. L’origine botanica dei campioni è stata testata mediante analisi melissopalinologica e la qualità dei mieli è stata verificata misurando l'umidità relativa e il tenore in idrossimetilfurfurale (HMF).
I risultati ottenuti hanno mostrato notevoli differenze in termini di potere antiossidante e contenuto fenolico totale tra i diversi mieli oggetto di analisi, ed una buona correlazione tra il colore e l'origine botanica del miele. Questo studio contribuisce quindi a migliorare la conoscenza dei potenziali effetti benefici di questo alimento sulla salute e suggerisce come il colore del miele di qualità potrebbe essere utilizzato come parametro per una rapida identificazione del suo contenuto in antiossidanti
Biomonitoring with Honeybees of Heavy Metals and Pesticides in Nature Reserves of the Marche Region (Italy)
Full text linkThe aim of this study was to carry out biomonitoring
with honeybees (Apis mellifera L.) to assess the presence of
pesticides and heavy metals (cadmium, chromium, nickel, lead)
in all of the ten nature reserves of the Marche Region (central–
eastern Italy). The study was carried out during the spring and
summer seasons when the honeybees were active, over 3 years
(2008–2010). Twenty-two colonies of honeybees bred in hives
were used. Samples of live and dead honeybees and of honey
were collected from 11 sampling stations fromMay to October
in each year. No pesticide pollution was found. Significant
differences in heavy metal concentrations were found among
years, months and sites, and in particular situations. The analysis
reveals that high heavy-metal concentrations occurred
exclusively in live honeybees. For the seasonal averages, the
most detected heavy metal was chromium, which exceeded the
threshold more often than for the other elements, followed by
cadmium and lead; nickel never exceeded the threshold. The
data are discussed with an evaluation of the natural and anthropic
sources taken from the literature and from local situations
that were likely to involve heavy metal pollution
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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