1,720,985 research outputs found
Influence of short-term postharvest ozone treatments in nitrogen or air atmosphere on the metabolic response of white wine grapes.
Full text linkGrapes were exposed to ozone gas in air (GO) or in nitrogen atmosphere (GNO) for 12 h at 10 A degrees C and then kept in normal atmosphere for 1 day at room temperature. Grapes kept at 10 A degrees C, for 12 h without ozone treatment plus 1 day at room temperature, were considered as the control sample (GC). Low temperature induced a great change of ripening features only in GC with reduction of weight, loss of sugars (about 20 %) and increase in titratable acidity but, above all, 15 % of increase in malondialdehyde (MDA). The use of ozone in air or in nitrogen neither altered the fruit quality attributes nor modified MDA concentration. Ozone provoked a high decrease of hydroxycinnamic acids, compared to the harvest grapes, overall in GNO samples (caftaric acid -38.8 %; coutaric acid -26.1 %). Cold storage treatment without ozone enhanced antiradical capacity. Three main flavonols, named hyperoside (quercetin-3-O-galactoside), rutin (quercetin-3-O-rutinoside), and kaempferol-3-O-glucoside were found in all grape extracts analyzed, and the total flavonol content increased significantly (p < 0.008) in all the samples starting from 1.79 mg/g dry matter of grapes at harvest (GH sample) up to 2.13 mg/g of GNO one. Both cold storage and ozone in air treatments significantly increased catechin content compared to that in the grapes at harvest (+54.6 and +35.7 % for GC and GO, respectively; p < 0.008). The interrelationships between the parameters analyzed and the different postharvest treatments, as well as the relationships among variables, were investigated by principal component analysis. Component loadings showed significant groupings for concentrations of hydroxycinnamic acid derivates and flavonols, which appeared as good candidates to be further considered as biomarkers of the physiological status of grapes. Similarly, the component scores grouped according to the different postharvest treatments, highlighting hyperoside as a useful indicator of the ozone effect on the grape's physiology
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
Antioxidant and pro-oxidant phytochemicals in ultrasound and microwave assisted extracts from hop cones: a statistical modelling approach
No full textThe present study investigated the relationships between different green extracts from hop cones (HGEs) and their cytoprotective/cytotoxic effects on human cultured colonocytes, using a multivariate statistical approach. HGEs were obtained by ultrasound (US) and microwave (MW) assisted extraction, using food grade solvents (ethanol and ethanol : water = 50 : 50 mixture). Their chemical fingerprinting showed the presence of 21 bioactive compounds belonging to the classes of polyphenols, prenylcalcones and floroacylglucinols, which were more abundant in MW ethanolic extracts. All the extracts, except for the US hydroalcoholic one, exerted a cytotoxic effect in a dose-dependent manner. HGEs did not alter the cellular redox status at low doses, while at the highest concentrations considered they displayed a pro-oxidant or antioxidant activity. Chemometric analysis revealed the compounds most correlated with cellular toxicity and/or ROS production and that the differences observed in Caco2 cells could be adequately explained by 2D statistical models including inhibitor-promoting agent pairs
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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