1,721,398 research outputs found
Vecchi e nuovi indicatori per valutare il trattamento termico e lo stato di conservazione del miele
No full textGli indicatori di produzione, trasformazione e conservazione, ampiamente utilizzati nel controllo della qualità del miele, ne permettono la caratterizzazione e la valorizzazione sul mercato. Agli indicatori classici, quali attività diastasica e idrossimetilfurfurolo, influenzabili dalle caratteristiche chimico-fisiche del miele, possono essere affiancati dei “nuovi indicatori” proposti recentemente (furosina, furoilmetil derivati, 1,-2 dicarbonili, maltulosio) che da utilizzare da soli o in combinazione con i vecchi consentono una migliore caratterizzazione e tutela del miele
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
Free and bound phenolic compounds in barley (Hordeum vulgare L.) flours: evaluation of the extraction capability of different solvent mixtures and pressurized liquid methods by micellar electrokinetic chromatography and spectrophotometry
No full textPhenolic compounds exist in free and bound forms in cereals. The efficiency, reliability and suitability of recovering free phenolic compounds from barley by conventional, solid-liquid and pressurized solvent extractions, using different mixtures and methods, were tested. The extraction recovery of bound phenolics was evaluated using alkaline and acid hydrolyses. This study illustrates a rapid application of micellar electrokinetic chromatography for the analysis of free and bound phenolic compounds in barley samples. After developing a capillary electrophoresis optimization plan, barley phenols were analyzed within 5.5 min, using a capillary electrophoresis. The selectivity of the extraction methods in recovering phenolic classes was evaluated by capillary electrophoresis and compared with spectrophotometric measurements. Electropherograms of free phenolic extracts showed flavan-3-ol compounds, proanthocyanidins and hydrolysable tannins. Aqueous acetone and aqueous ethanol solvents extracted the highest amount of catechins and hydrolysable tannins, respectively. The extraction yield of bound phenolic compounds (especially hydroxycinnamic acids) increased when the digestion time for alkaline hydrolysis was prolonged
Analisi dei composti fenolici liberi e legati in farine d’orzo classificate ad aria: confronto tra elettroforesi capillare, HPLC e metodi spettrofotometrici
No full textL’introduzione del concetto di functional food ha aumentato l’interesse della comunità scientifica e non per i composti fenolici e la loro presenza nel mondo vegetale.
Nell’ambito delle produzioni di origine vegetale, i cereali e i loro derivati rivestono un notevole interesse nutrizionale sia quantitativo che qualitativo nella dieta Mediterranea, rappresentando la principale fonte energetica per questo modello alimentare. Inoltre, diversi studi hanno evidenziato che i cereali contengono interessanti quantitativi di sostanze fenoliche a spiccata attività antiossidante.
I composti fenolici dei cereali sono presenti allo stato libero e allo stato legato. La prima frazione è rappresentata prevalentemente da fenoli semplici, come catechine e i loro derivati proantocianidinici ed alcuni acidi fenolici, mentre la frazione legata è costituita prevalentemente da acidi cinnamici e idrossicinnamici associati alla parete cellulare. Lo scopo di questo lavoro è stato quello di valutare la componente fenolica libera e legata mediante metodiche analitiche separative confrontate con gli indici spettrofotometrici classici (Folin Ciocalteu, indice di acidi idrossicinnamici, DPPH) in farine d’orzo ottenute mediante classificazione ad aria.
I metodi analitici strumentali impiegati sono stati: HPCE/UV-DAD e l’HPLC/UV-DAD/ESI-MSD. Questi metodi hanno fornito dati caratterizzati da positive correlazioni con quelli spettrofotometrici. Naturalmente, i metodi cromatografici hanno il vantaggio di separare e rivelare i singoli composti fenolici e perciò di fornire, con una stessa corsa, informazioni quali-quantitative sulle diverse classi e sui singoli composti identificati. I dati ottenuti mostrano come l’orzo sia un prodotto interessante per il suo contenuto di fenoli totali. Questa osservazione è stata confermata, oltre che da tutte le informazioni analitiche descritte, anche dalla valutazione della capacità antiossidante misurata mediante test del DPPH (ed espressa come TEAC, trolox equivalent antioxidant capacity), che ha fornito valori molto interessanti e che ha evidenziato come la capacità antiossidante sia significativamente più elevata nella frazione grossolana rispetto a quella fine, mentre il prodotto integrale mostra valori intermedi
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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