1,720,968 research outputs found
Evaluation of the chemical quality of a new type of small-sized tomato cultivar, the plum tomato (Lycopersicon lycopersicum)
No full textSono stati valutati gli attributi chimici e nutrizionali di un nuovo tipo di pomodoro di piccola pezzatura, chiamato Datterino, recentemente introdotto nel mercato europeo. Sono state considerate sei differenti cultivar (Dasher, Iride, Navidad, Sabor, 292 e 738) e confrontate con una cultivar di pomodoro ciliegino (cv. Cherubino) coltivata nella stessa serra e nelle medesime condizioni. I risultati hanno mostrato alcune differenze significative rispetto alla tipologia ciliegino: un più intenso colore rosso, una minore quantità di acidi ed un maggiore contenuto di licopene. Gli attributi di qualità della cv. 738 sono stati superiori ai valori medi. Il ciliegino, invece, ha mostrato quantità leggermente più elevate di acido ascorbico e di b-carotene.The chemical-nutritional attributes were evaluated in plum tomato, a new type of oblong, small-sized tomato that was recently introduced in the European market. Six different cultivars, namely, Dasher, Iride, Navidad, Sabor, 292 and 738, were tested and compared with a cherry-type tomato (cv. Cherubino) which was grown in the same greenhouse under the same conditions. The plum tomato showed important marked differences with respect to the cherry type: more intense red colour, lower acid content and a higher lycopene content. The quality attribute values for cv. 738 were higher than the average values for the other cultivars. In contrast, the cherry-type variety had slightly higher levels of ascorbic acid and b-carotene than the plum tomatoes
La distribuzione degli amminoacidi liberi quale criterio per accertare l’origine geografica delle arance bionde e pigmentate
No full textIl presente lavoro si prefigge l’obiettivo di individuare dei marker in grado di distinguere l’origine geografica delle arance siciliane e calabresi, che insieme costituiscono oltre il 90% dell’intera produzione italiana. La distribuzione degli acidi idrossicinnamici nei succhi si è rivelata efficace per discriminare l’origine geografica delle varietà a polpa rossa, ma è inidonea per discriminare quelle a polpa bionda. Quale criterio diagnostico è stata analizzata e discussa la distribuzione degli amminoacidi liberi nei succhi. Pertanto, nel corso dell’annata arancicola 2007-2008, sono stati prelevati presso diverse aziende agrumicole siciliane e calabresi 70 differenti campioni di arance di varietà bionde e pigmentate. Sono stati determinati 19 amminoacidi con la metodologia
HPLC con rivelatore a fluorescenza, previa derivatizzazione. Gli amminoacidi sono stati quantificati mediante calibrazione esterna ed espressi in mmol/L, e i dati sperimentali sono stati elaborati con trattamenti statistici descrittivi e multivariati. Il contenuto di arginina nei succhi può essere considerato un marker di varietà e di origine geografica, ma anche altri amminoacidi (acido aspartico, asparagina, serina, glicina e prolina) contribuiscono a discriminare nettamente le varietà bionde siciliane da quelle calabresi
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
Characterization of pectinmethylesterase, β-galactosidase and ascorbate oxidase from Sicilian blood orange.
No full textPartial dehydration of cherry tomato at different temperature, and nutritional quality of the products
No full textThis study concerns the partial dehydration of cherry tomatoes (Lycopersicon esculentum, var. Shiren) to obtain a product with 25% initial water content. Two kinds of dried tomatoes were obtained using a forced air oven at 40, 60 and 80 °C for different lengths of treatment. The first type was dehydrated after immersion of the fresh tomatoes in an aqueous solution of citric acid, sodium and calcium chloride (10:10:24 g/l); the second was obtained with no pre-treatment. The products were characterised by measuring their CIE L*a*b* colour parameters and levels of L-ascorbic acid, lycopene and β-carotene to evaluate thermal damage during processing under the different conditions. Moreover, water activity and the formation of 5-hydroxymethylfurfural were also determined as an index of sugar heat degradation. Treatment with a dipping solution protected both the nutritional and chemical qualities of the partially dried cherry tomatoes. Temperature was directly related to browning, ascorbic acid loss and HMF formation, while no clear influence could be found for carotenoid degradation
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
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
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