1,720,978 research outputs found
Degradation patterns for external and nutritional quality parameters of fresh-cut 'cantaloupe' melons
No full textNutritional quality of fresh-cut produce is very important for the consumer. Its evaluation may be expensive and time-consuming for the industry, which conversely can easily determine changes in external appearance including color. The aim of this work was to find possible relationships between degradation of appearance attributes and the retained nutritional content of fresh-cut 'Cantaloupe' melons. Melon pieces were stored for 8 days in air at 5°C and 99% RH. Initially and after 1, 2, 3, 7 and 8 days of storage external (color, appearance score) and internal (acidity, soluble solids, fructose content, vitamin C, phenolic, antioxidant activity) quality parameters were monitored. For each parameter a degradation curve over time was obtained, which was fitted to zero and first order kinetics. For most of the quality parameters degradation patterns followed a kinetic of the first order, antioxidant activity and soluble solids could not be described by any significant kinetic. The appearance score showed the highest kinetic rate (0.17 day-1), followed by titratable acidity (0.09 day-1) and vitamin C (0.06 day-1). Score 3 and 2, which were defined as the limits of marketability and edibility, respectively, were used as reference for comparing the percentage of quality changes over time. When melon pieces reached score 3 that corresponded to 40% of initial variation, acidity increased of 39% and vitamin C decreased by 20%. When score reached a value of 2 (60% of variation), acidity increased by 73% and vitamin C decreased by 30%. Further research about different storage conditions and melon cultivars is needed in order to confirm the relationship between simple quality indicators linked to appearance degradation and nutritional quality of fresh-cut melon
Degradation patterns for external and internal quality attributes of fresh-cut apples
No full textThe aim of this work was to find possible relationships between degradation of appearance attributes and the retained nutritional and organoleptic value of fresh-cut apples ('Stark red delicious'), and the influence of temperature on quality degradation. Apple pieces were stored for 9 days in air at 5 and 10°C and 99% RH. Initially and after 1, 2, 5, 7 and 9 days of storage external (color, appearance score) and internal (acidity, soluble solids, phenol content, antioxidant activity) quality parameters were monitored. For each parameter a degradation over time curve was obtained, which was fitted in kinetics of zero and first order. For apple pieces stored at 5°C, appearance score, color attributes L∗, a∗, and b∗showed significant kinetics, together with sensorial evaluation of taste, texture and aroma. At 10°C, appearance score, color attributes, sensorial evaluations, phenol content, and antioxidant activity, showed significant kinetics. Sensorial evaluations were fit in an order 0 kinetic, together with a∗values, while L∗and b∗, and phenols and antioxidant activity at 10°C were fit in an order 1 kinetic. Appearance score degradation over time at 10°C showed a kinetic slope that was doubled than at 5°C, while taste and aroma kinetic rates increased almost 10 times when temperature varied from 5 to 10°C. According to the highest kinetic rate, shelf-life of fresh-cut apples was limited by the appearance degradation at 5°C and by aroma and taste degradation at 10°C. Using appearance score 3 and 2, which were respectively defined as the limits of marketability and edibility, as reference for comparing the percentage of quality changes over time, the following relation can be found. A variation of 34% of appearance score at 5°C, corresponded to 19% variation of aroma, 17% of taste and 10% for texture. At 10°C all sensorial (taste, texture, aroma) decreased about 40%, while phenols increased by 29% and antioxidant activity decreased by 28%. When the score reached the value of 2 (i.e., 56% of initial variation) at 5°C, aroma decreased by 32%, taste by 28% and texture by 18%. At 10°C, all sensorial decreased by about 70%, phenols increased by 75% and antioxidant activity decreased by about 41%
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
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