1,720,996 research outputs found
Coffea arabica
No full text<i>2.3. In vitro antioxidant capacity of C. arabica and C. canephora</i> <p> In order to assess the antioxidant capacity of the green coffee extracts, we evaluated their reducing power by ferric thiocyanate assay and the free radical scavenging activities by DPPH radical assay. In general, the extracts were more active as antioxidants when tested by the reducing power assay (Fig. 5), since the steric accessibility of DPPH nitrogen-centered radical strongly affects the reaction rate of antioxidant compounds (Prior et al., 2005). Fig. 5 depicts the scatter plot of IC 50 values from both tests. As expected, the four <i>C. canephora</i> accessions showed the highest antioxidant activity (lowest IC 50 values for both assays) with respect to all other accessions. Although weaker than chlorogenic acid (Zhao et al., 2015), caffeine as well possesses antioxidant capacity, as recently demonstrated in <i>in vivo</i> experiments (Tsoi et al., 2015). Therefore, the higher content of both chlorogenic acids and caffeine correlates with a higher antioxidant capacity.</p> <p> Among the <i>C. arabica</i> accessions, the samples from Kenya showed the highest antioxidant capacity, followed by one of the accessions from Peru (A-Peru2) and one from Honduras (A-Honduras2). The lowest antioxidant capacity was observed in the Ethiopian (A-Ethiopia) and Guatemala (A-Guatemala) accessions, whereas intermediate antioxidant activities were observed for the remaining green coffee accessions.</p>Published as part of <i>Babova, Oxana, Occhipinti, Andrea & Maffei, Massimo E., 2016, Chemical partitioning and antioxidant capacity of green coffee (Coffea arabica and Coffea canephora) of different geographical origin, pp. 33-39 in Phytochemistry 123</i> on page 37, DOI: 10.1016/j.phytochem.2016.01.016, <a href="http://zenodo.org/record/10485263">http://zenodo.org/record/10485263</a>
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
Effectiveness and mode of action of phosphonate inhibitors of plant glutamine synthetase
No full textBACKGROUND: Aiming at the rationale design of new herbicides, the availability of the three-dimensional structure of the target enzyme greatly enhances the optimization of lead compounds and the design of derivatives with increased activity. Among the most widely exploited herbicide targets is glutamine synthetase. Recently, the structure of a cytosolic form of the maize enzyme has been described, allowing verifying whether steric, electronic and hydrophobic features of a compound are in agreement with inhibitor-protein interaction geometry.
RESULTS: Three series of compounds (aminophosphonates, hydroxyphosphonates and aminomethylenebisphosphonates) were evaluated as possible inhibitors of maize glutamine synthetase. Aminomethylenebisphosphonate derivatives substituted in the phenyl ring retained the inhibitory potential, whereas variations in the scaffold, i.e. the replacement of the second phosphonate moiety with a hydroxyl or an amino residue, resulted in a significant loss of activity. A kinetic characterization showed a mechanism of non competitive type against glutamate and uncompetitive against ATP. A docking analysis suggested the mode of bisphosphonate binding to the active site.
CONCLUSION: Results allowed defining the features required to maintain or enhance the biological activity of these compounds, which represent lead structures to be further exploited for the design of new substances endowed with herbicidal activity
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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