1,721,108 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
Species identification in surimibased products using Next Generation Sequencing technologies
Get PDFThe Next Generation Sequencing (NGS) technologies represent the new frontier of the DNA-based analytical methods and they are nowadays largely applied in many research fields. In the food inspection, NGS are especially suitable for species identification in highly processed products composed by a mixture of different species. The lack of the species morphological key features particularly exposes such products at risk for mislabelling and may compromise consumer’s safety if toxic or allergic species are involved. Surimi typically represents a multispecies seafood commodity and it can be described as a myofibrillar protein concentrate, essentially represented by minced fish and cephalopod flesh that has been washed repeatedly with water and strained to remove sarcoplasmatic proteins, lipids and other undesirable components. Following straining, it is usually mixed with cryoprotectants and frozen. Surimi is basically an intermediate product used for the preparation of typical ready-to- eat products such as fish sausages, crabsticks and imitation shrimp products, highly marketed and consumed in almost all countries of the world. In this study, a metabarcoding approach based on the Ion Torrent NGS technologies was applied to detect and identify species within surimi-based products. Sixteen commercial products of both EU and non-EU origin were collected. DNA was extracted from all the products. Libraries were prepared by ligating Ion-compatible adapters to amplicons obtained by amplifying each DNA sample using a 16SrRNA universal primer tested on a wide range of fish and cephalopod species. In particular, the used primer pair was proved in a previous study as able to amplify a fragment of ⁓250-260 (depending on the species) from fish and of 190-200 bp (depending on the species) from cephalopods, both with high inter-species variability. Three equimolar pools of barcoded libraries were prepared: barcoded libraries from samples 1 -6 (Pool 1), samples 7-12 (Pool 2) and samples 13 -16 (Pool 3) were pooled together. Massive DNA clonal parallel amplification and sequencing phases were performed on Ion ChefTM System and Ion PGMTMSystem (Thermo Fisher Scientific), respectively, following the manufacturer protocol. Three Ion 314 v2 BC sequencing chips were loaded (Chip 1 for Pool 1, Chip 2 for Pool 2and Chip 3 for Pool 3). A bioinformatic analysis was performed to evaluate the data quality in term of final number of usable sequences and to obtain the reads taxonomic profile through metabarcoding approach. Overall, 674.983 sequences (78% of total analysed) and 674.826 raw sequences (73% of total analysed) were obtained from Chip 1 and Chip 2, respectively, while Chip 3 was less performant as the 668.081 raw sequences evaluated as usable represented the 58% of all the sequences analysed. Fish DNA was the most represented in all the samples (always greater than 75% and in 75% of the samples greater than 90%); Molluscs DNA was also found in 100% of the samples, in different percentages. In particular, 25% of the samples contained less than 1% of molluscs' DNA, 50% between 1% and 10%, 12.5% between 10% and 20%, and 12.5% more than 20%. DNA from 13 families, 19 genera and 16 species of fish, and from 3 families, 3 genera and 3 species of cephalopods was found. DNA belonging to the Gadidae family was found in 100% of the samples. The percentage was rather high in most of the cases, exceeding 90% in 50% of the samples, ranging from 70 to 90% in 31.2% of the samples and from 40 to 70% in 12.5% of the samples. Gadidae were poorly represented (<2%) only in one Asian sample of non-EU origin. DNA from Gadus genus was found in 100% of the samples, with the species Gadus chalcogrammus identified in 93.75% of the samples, whereas DNA from Gadus morhua was detected in two samples. Also, DNA from Arctogadus genus/Arctogadus glacialis species, Melanogrammus genus/Melanogrammus aeglefinus species and Merlangius genus/Merlangius merlangus species was detected in 6.25%, 43.75% and 6.25% of the samples, respectively. DNA belonging to Merluccidae family was found in 25% of the samples, in variable percentages (from ' 1% to over 36%). and only Merluccius genus/Merluccius merluccius species was present in that samples. 12.3% of DNA from Nemipteridae family/Nemipterus genus (species identification was not reached) was found in one sample. Variable percentage of DNA of species belonging to other ten families was found in some samples. Overall, the most part of the fish species found in the samples were reported in literature as used for surimi production or they were found in studies aimed at identifying species in such type of products. Unconventional species were instead found in three samples of non-EU origin. Regarding molluscs, DNA from Ommastrephidae family/Todarodes genus/Todarodes pacificus species was found in 75% of the samples. DNA belonging to Loliginidae family/Doryteuthis genus/ Doryteuthis opalescens species and Architeuthidae family/Architeuthis genus/Architeuthis dux species was also found in one sample. Differently from fish, the molluscs species found in the analysed samples did not correspond to those listed as the most used in surimi manufacture. Overall, 37.5% of the samples were found as mislabelled. Among them, 25% voluntary declared a species different from those detected in the analysis and 25% (all of non-EU origin) did not report the presence of molluscs on the label, posing a potential health threat for allergic consumers. The presence of vulnerable species was also proved, such in the case of Paretroplus maculatus (Cichlidae family) and Trichopodus leeri (Osphoronemidae family). Although further studies are needed to optimize the analytical protocol and larger number of samples are required, the metabarcoding approach based on the Ion Torrent NGS technologies was proved to be suitable for species identification of processed multispecies seafood products. The great and diversified range of species found in the samples, also including vulnerable ones, as well as the often-undeclared presence of potentially allergic risks, strongly remarks the still too weak control system and poorly eco-friendly management around the global seafood sector, highlighting the necessity to further strengthen the tools aimed at ensuring both consumers and environmental protection
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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