1,720,958 research outputs found
Caratterizzazione preliminare di farine di semi di carruba (Ceratonia siliqua L.) di differente origine geografica
No full textLa farina di semi di carruba, nota internazionalmente come Locust Bean Gum (LBG) e classificata nella lista europea degli additivi alimentari con la sigla E410, viene impiegata come addensante e stabilizzante nelle preparazioni alimentari. Obiettivo del presente lavoro è quello di valutare le varietà di carrubo più idonee per l'ottenimento di rivestimenti edibili da impiegare nella conservazione degli alimenti. L'interesse verso i film edibili per il diretto rivestimento dei prodotti alimentari è legato alla capacità di fungere da barriera con l'esterno e quindi di regolare gli scambi gassosi che potrebbero compromettere la salubrità e le proprietà sensoriali dell'alimento. Dodici varietà di carrubo, di differente provenienza geografica (Italia, Spagna, Tunisia, Turchia, Marocco), sono state analizzate effettuando le seguenti determinazioni: caratterizzazione dei semi, resa in germe e gomma, proprietà reologiche di soluzioni standard. Lo studio è stato sviluppato in modo da caratterizzare dal punto di vista reologico, diverse tipologie di soluzioni per coating in modo da ottenere il maggior numero di informazioni al fine della loro eventuale selezione ed applicazione.
Le varietà italiane Ibla e Racemosa e quella marocchina si sono dimostrate le migliori in termini di resa, la varietà proveniente dal Marocco si distingue anche per l'elevato potenziale tecnologico
Quality evaluation of shrimps (Parapenaeus longirostris) as affected by edible films
No full textThe effect of chitosan blends with different components as coatings for the shelf-life extension of fresh shrimps was evaluated during chilled storage. Blended films were: chitosan solution, chitosan solution added with tapioca starch, cornstarch flour and locust bean gum (LBG). Untreated shrimps were used as control. These coating solutions were characterised by means of pH, viscosity and color measurements. The effects of these edible films on the shelf-life of shrimps were monitored during storage by physical (color and rheological measurements), chemical (pH, total volatile basic nitrogen, TVBN) and microbiological (total bacterial counts) analyses. Sensory analyses were also performed to define the state of freshness of the products. The coating solutions showed similar characteristics, such as pH, viscosity and color, but different effects on the shelf-life of shrimps. Generally the effect of coating solutions on shrimps shelf-life is positive but in necessary to continue the research to improve the results
Geographical origin assessment of orange juices by comparison of free aminoacids distribution
No full textScientific research nowadays makes considerable efforts for the setting of methods for the assessment of the geographical origin of food products. Very few studies have focused on orange juices, aiming at differentiating the origin of samples coming from very far areas of the world, while no research has attempted to find suitable markers able to ascertain the geographical origin of orange juices produced in neighbouring regions, such as those of south Italy, where more than 90% of the entire Italian production is concentrated. Past studies showed that the distribution of hydroxycinnamic acids in juices is effective for the origin assessment of blood orange varieties, but unsuitable for blonde ones. In the present, we have assessed and discussed the distribution of free aminoacids in orange juices. Seventy samples of the blood and blonde varieties were collected from different citrus farms located in Sicily and Calabria throughout the season 2007-2008. Nineteen aminoacids were determined, subject to prior derivatization, by HPLC with fluorimetric detector. Aminoacids were quantified by external calibration and expressed as mmol L-1 and experimental data were elaborated by statistical analysis. The total free aminoacid content, as well as the level of proline, arginine, aspartic acid, asparagine, serine and glycine can be considered as a markers of geographic origin, contributing to sharply discriminate blonde Sicilian orange varieties from Calabrian ones
Produzione e caratterizzazione di confetture e gelatine da carrube
No full textIl carrubo (Ceratonia siliqua L.) è una pianta tipica dell’area mediterranea ed è estesamente coltivato in Sicilia. L’utilizzo ai fini alimentari dei frutti, se si esclude l’impiego dei semi per ricavare la farina di semi di carrube utilizzata come addensante, è molto limitato e la polpa di carrube trova impiego quasi esclusivamente in ambito zootecnico. Tuttavia le peculiari caratteristiche nutrizionali delle carrube quali lo scarso contenuto in grassi, l’elevato contenuto in zuccheri, in fibre e in polifenoli e l’alto potere antiossidante ne suggeriscono un maggiore impiego nell’ambito dell’alimentazione umana. Scopo della ricerca è la messa a punto del processo di produzione e la caratterizzazione nutrizionale di un prodotto alimentare trasformato quale confettura o gelatina. Sono stati così ottenuti preparati utilizzando come componenti principali un estratto acquoso del frutto con e senza l’addizione di farina di polpa
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
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