1,720,958 research outputs found
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
Ochrobactrum tritici imobilizado em Oryza sativa, poliacrilato de sódio e alginato como uma nova ferramenta de biorremediação de arsénio
No full textDissertação de Mestrado em Ecologia apresentada à Faculdade de Ciências e TecnologiaArsenic pollution is a worldwide problem and although several remediation strategies are present, their costs are high and their effect low. The use of bioremediation as a strategy for cleaning polluted sites has been revealed as a promising approach such. One of these strategies is bioaugmentation, i.e. the addition of exogenous bacteria in a polluted site to remove contaminants. In a previous study a strain of the Ochrobactrum tritici bacteria was genetically modified by silencing the arsenite efflux pumps of the cell membrane. In this study the arsenic accumulator was immobilized in several supports: an alginate gel, a polyacrylate gel, rice plants, an acrylamide gel, a 2-hydroxyethyl methacrylate gel and a 2-hydroxyethyl acrylate gel. Their performance as a support for arsenic accumulation was tested. Of the gels, the alginate gel and the polyacrylate gel showed the most promising results in terms of water permeability and bacterial survival inside of the gel. The results of the alginate gel indicate an uptake of 29% of the environmental arsenite of 10mM and 2mM and a 19% uptake at arsenite concentrations of 200µM. The inoculated polyacrylate gel took up 6% of the arsenite in a 200 µM arsenite solution. Rice plants without bacteria managed to take up 44% of the arsenic present in a concentration of 20 µM, while rice plants with the mutated bacteria did not significantly take up any arsenite whatsoever. The presence of the bacteria did not increase the arsenic uptake of the plant, but conferred more resistance to arsenic in terms of plant growth. The use of inoculated alginate gels and rice plants for the uptake of arsenite from the environment, suggests experimentation in-situ. The arsenite resistance in rice plants due to the O.tritici double mutant in rice plants opens up new research possibilities for the effect of bacteria on the metal metabolism of plants.A poluição do arsênico é um problema mundial e, embora existam várias estratégias de remediação, não são econômicas e eficientes. O uso da biorremediação como estratégia para a rémoção de poluídos locais foi revelado como uma abordagem promissora. Uma dessas estratégias é a bioaugmentação, ou seja, a adição de bactérias exógenas em uma área poluída para remover contaminantes. Em um estudo anterior, uma cepa da bactéria Ochrobactrum tritici foi geneticamente modificada ao silenciar as bombas de efluxo do arsenito da membrana celular. Neste estudo, o acumulador de arsênico foi imobilizado em vários suportes: um gel de alginato, um gel de poliacrilato, plantas de arroz, um gel de acrilamida, um gel de metacrilato de 2-hidroxietilo e um gel de acrilato de 2-hidroxietilo. O seu desempenho como suporte à acumulação de arsênio foi testado. Dos géis, o gel de alginato e o gel de poliacrilato mostraram os resultados mais promissores em termos de permeabilidade à água e sobrevivência bacteriana dentro do gel. Os resultados do gel de alginato indicam uma absorção de 29% do arsenito ambiental de 10mM e 2mM e uma absorção de 19% em concentrações de arsenito de 200 μM. O gel de poliacrilato inoculado absorveu 6% do arsenito em uma solução de arsenito de 200 μM. As plantas de arroz sem bactérias conseguiram absorver 44% do arsênio presente em uma concentração de 20 μM, enquanto as plantas de arroz com a bactéria mutada não absorveram significativamente qualquer arsenito. A presença das bactérias não aumentou a absorção de arsênico da planta, mas conferiu maior resistência ao arsênio em termos de crescimento da planta. O uso de géis de alginato inoculados e plantas de arroz para a absorção de arsenito do meio ambiente, sugere experimentação in situ. A resistência do arsenito em plantas de arroz devido ao duplo mutante de O.tritici em plantas de arroz abre novas possibilidades de pesquisa para o efeito das bactérias no metabolismo do metal das plantas
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
- …
