1,720,961 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Development and optimization of a microwave-assisted protein hydrolysis method to permit amino acid profiling of cultivated and wild wheats and to relate the amino acid to grain mineral concentrations
Get PDFWholegrain flour from durum wheat (T.durum, cv. Balcali-2000) was subjected to amino acid analysis following microwave-assisted acid hydrolysis. To optimize this new method, a range of sample masses (100-500 mg), incubation temperatures (130-170[centigrade degree]) and time intervals (1- 4h) were assessed. Overall, the greatest recovery of amino acids was obtained when 200 mg of wheat flour sample was hydrolyzed at 150[centigrade degree] for 3 h. The developed microwave hydrolysis method was confirmed to yield comparable findings with classic reflux methods. Integration of all amino acid signals corresponded to 85 % of the total protein content calculated by total N. The highest signal reflected the combined contributions of glutamic acid and glutamine, in accord with previous findings. Also as expected, proline was found to rank in second place. It follows to reason that an optimized microwave-assisted hydrolysis method may describe a rapid means to compare the constitution of different genotypes of wheats and may further show merit and general applicability towards the rapid analysis of commercially important crops and their end-products. In all wheat species and genotypes Glu was the most abundant amino acid, followed by Pro, whereas Met sln, Lys and Thr were the most limited. The quantities and ratios of individual amino acids were consistent with the literature data and the quantitative order of major and minor amino acids did not change in genotypes or species. However, amino acids exhibited significantly high variations among genotypes and species which can be exploited to enhance specific and/or total amino acids (i.e. protein) in high yielding cultivated wheats through selection, breeding and targeted molecular approaches. Although the existence of significant associations between a few amino acids and mineral nutrients, it was not possible to define or explain a co-transport or co-accumulation mechanism. Future research should focus on the phloem transport and mobility of metal binding proteins and organic ligands, rather than individual amino acids. A major finding of this study was the augmentation of correlations (among amino acids, nutrients and amino acids with nutrients) upon prescreening for contrasting grain N (or protein) concentration. Advancements in increasing the grain protein content of wheat can significantly contribute to enrichment of grains with almost all mineral nutrients except K and Ca
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Antimicrobial and free radical scavenging activities of five palestinian medicinal plants
Get PDFExtracts from five indigenous Palestinian medicinal plants including Rosmarinus officinalis, Pisidium guajava, Punica granatum peel, grape seeds and Teucrium polium were investigated for antimicrobial and free radical scavenging activities against eight microorganisms, using well diffusion method. The microorganisms included six bacterial isolates (i.e. Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginos, Klebsiella pneumonia, Bacillus subtilis and Micrococcus luteus) and twofungal isolates (i.e. Candida albicans and Aspergillus niger). A standard antioxidant assay was performed on the plant extracts to assess their capability in scavenging 2,2-diphenyl-1-picrylhydrazyl (DPPH). Of the five tested plant extract, only Rosmarinus offcinalis extract contained significant antimicrobial activity against all eight microbial isolates including Pseudomonas aeruginosa. Extracts from other four plants exhibited a variable antimicrobial activity against all microorganisms, except Pseudomonas aeruginosa. Significant antioxidant activity was detected in all plant extracts. However, extracts from Pisidium guajava leaves contained significantly higher antioxidant activity compared to the other extracts tested. The antimicrobial and scavenging activities detected in this in vitro study in extracts from the five Palestinian medicinal plants suggest that further study is needed to identify active compounds to target diseases caused by a wide-spectrum pathogens.Key words: Antimicrobial activity, plant extract, scavenging activit
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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