1,720,978 research outputs found
Marketability of ready-to-eat cactus pear as affected by temperature and modified atmosphere
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Suitability for ready-to-eat processing and preservation of six green and red baby ceaves cultivars and evaluation of their antioxidant value during storage and after the expiration date
No full textThe physiological and chemical traits of three red (MS151, Copacabana and Excellent) and three green (Ortis 398, Summerbell and Babybell) baby leaf lettuce cultivars were evaluated during postharvest cold storage. In addition, their potential use as a source of antioxidants, after the expiration date, was also investigated. Red cultivars showed the best performance in terms of nutritional and physiological parameters. In particular, the antioxidant activity was 11-fold higher in red than in green baby leaf lettuces. Moreover, Ortis 398, MS151 and Copacabana, showing the lowest values for respiration rate, ammonium accumulation and electrolyte leakage, were selected as suitable for ready-to-eat processing and preservation. Finally, the cultivars Ortis 398, MS151 and Excellent were found to be of interest for the extraction of antioxidants due to their high phenol content. Practical Applications: The selection of the most appropriate cultivars for ready-to-eat (RTE) salads is of primary importance in order to have good quality, to reduce storage losses and to have, after the expiration date, a produce still exploitable for the extraction of phytochemicals. Ortis 398, MS151 and Copacabana were selected, among the studied new baby leaves cultivars, for their particular aptitude for RTE processing. In addition, because RTE lettuce remains often unsold due to the loss of its fresh appearance, our results suggest the possibility to re-utilize the waste (after the expiration date) as a source of antioxidants. This could represent a practical application opportunity for the food industry. With this aim, the cultivars Ortis 398, MS151 and Excellent were selected for their high content in total polyphenols even after the expiration date
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
Postharvest application of oxalic acid to preserve overall appearance and nutritional quality of fresh-cut green and purple asparagus during cold storage: a combined electrochemical and mass-spectrometry analysis approach
No full textThe effect of oxalic acid (OA) treatment on visual properties and bioactive compounds of two green and one purple cultivars of fresh asparagus was investigated during twelve storage days at 5 degrees C. Cold storage and OA treatment positively affected the overall appearance of the investigated cultivars. Cut-end dehydration increased, all along the storage period, in all cultivars but, the negative effect of the storage, clear on control samples, was mitigated by OA. The most represented compounds in Grande and Vegalim cultivars were: quercetin rutinoside, feruloyl quinic acid and cumaroyl quinic acid. Cyanidin glucosyl rutinoside, cyaniding rutinoside and peonidin rutinoside were identified in Purple Passion cultivar. The bioactive compounds seemed to be affected by storage but not by OA treatment. The sensor-biosensor system indicated that the antioxidant activity is negatively affected by storage but not by OA. The decrease of antioxidant activity coincided with the reduction of ascorbic acid levels in all the cultivars
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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