1,720,957 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
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
Characterization, cloning, expression and study of the regulation of phytase genes in Streptomyces and Bacillus
No full textLes phytases hydrolysent les phytates représentant la forme majeure de stockage du P dans les céréales. Ces phytates sont aussi des facteurs anti-nutritionnels qui chélatent les cations réduisant leur absorption. Dans le premier volet de cette thèse, une nouvelle souche bactérienne produisant une phytase extracellulaire a été isolée et identifiée comme Bacillus amyloliquefaciens US573. L’enzyme «PHY US573» a été purifiée et caractérisée en comparaison avec deux phytases commerciales Ronozyme PL et Natuphos. PHY US573 se distingue par sa forte thermostabilité en présence de calcium. En outre, PHY US573 se caractérise aussi par une tolérance remarquable aux sels comme le NaCl et LiCl. L’ensemble de ces propriétés montre que PHY US573 pourrait être une candidate intéressante pour des applications en alimentation animale ou en agriculture pour améliorer la biodisponibilité du P-phytique pour les plantes. Dans le deuxième volet, la souche Streptomyces sp. US42 produisant une activité phytase extracellulaire a été sélectionnée. L’enzyme «PHY US42» a été purifiée et caractérisée. PHY US42 est calcium dépendante également une grande stabilité en présence de sels biliaires et des protéases digestives. La modélisation moléculaire de PHY US42 indique qu'elle appartient au groupe des β-propeller phytases qui sont généralement calcium-dépendantes. Vu ses propriétés biochimiques intéressantes, PHY US42 constitue une bonne candidate comme additif dans les aliments pour animaux monogastriques en combinaison avec une histidine acide phytase. Enfin dans un troisième volet, nous nous sommes intéressés à l’étude de la régulation de l'expression du gène phytase de S. coelicolor M145 (sco7697) chez S. coelicolor M145, S. lividans TK24 ainsi que chez ses deux mutants ppk et phoP. Ainsi, en plus des boites pho localisées en amont de la région promotrice -35 siège de la régulation positive PhoP-dépendante, nous avons révélé pour la première fois que la RD localisée en aval de la région promotrice -10 est le siège d’une forte régulation négative par un répresseur inconnu. Ce dernier empêcherait l’activation PhoP-dépendante de l’expression du gène phytase.Phytases hydrolyse phytate representing the major storage form of P in cereal. phytates are also anti-nutritional factors that chelate cations such as Ca²⁺, Mg²⁺, Fe²⁺, Z²⁺ reducing their absorption. The low bioavailability of phytic phosphorus in monogastric animals require their food supplementation with Pi to meet the needs of the animal in P. This creates an extra cost and increases the environmental pollution by the manure excretion highly charged phosphate. In the first part of this thesis, from soil samples taken near hot hydrothermal waters of the region Elhamma in southern Tunisian, a new bacterial strain producing extracellular phytase was isolated and identified as Bacillus amyloliquefaciens US573. The enzyme referred "PHY US573" was purified and characterized in comparison with two commercial acid histidine phytases Ronozyme PL and Natuphos. PHY US573 is calcium dependent and has an optimum activity at pH 7.5 (5 for Ronozyme and 5.5 for Natuphos) and 70°C (55°C for Ronozyme and Natuphos). PHY US573 is distinguished by its high thermostability, in fact, it keeps 93% of its activity after incubation for 10 min at 75°C in the presence of calcium while Ronozyme and Natuphos keep only 45% and 53% of their activity, respectively. This enzyme is specific for phytic acid and also has a very good stability at pH 3 to 9 and a perfect stability in presence of bile salts. In addition, PHY US573 is also characterized by a remarkable salt tolerance because it retains 80 to 95% of its activity in the presence of 20 g/l of NaCl and LiCl, respectively. All these properties shows that PHY US573 could be an interesting candidate for applications in feed industry alone or in combination with an histidine acid phytase. In a second part of this thesis, from the Streptomyces collection of LMB-CBS, a strain producing extracellular phytase activity was selected and identified as Streptomyces sp. US42. The enzyme "PHY US42" was purified and characterized. PHY US42 has a calcium-dependent activity (such as Bacillus phytases), optimally active at pH 7 and 65°C. PHY US42 is perfectly stable at pHs ranging from 5 to 10 and its thermal stability is greatly increased in the presence of calcium. Indeed, PHY US42 maintains 80% of its activity after 10 min of incubation at 75 °C in the presence of calcium. PHY US42 has also a high stability in the presence of bile salts and digestive proteases. Molecular modeling of PHY US42 indicates that it belongs to the β-propeller phytase group which are usually calcium-dependent. Given its interesting biochemical properties, PHY US42 which would operate mainly in the intestine, is a good candidate for use as an additive in agastriques fish food or in combination with an histidine acid phytase in feed industry. Finally in a third part, we are interested in studying the regulation of the expression of the phytase gene of S. coelicolor M145 (sco7697) in S.coelicolor M145, S.lividans TK24 and among its two mutants ppk and phoP. To do this, we merged the wild promoter regions (phyWT) or mutated (phym1, phym2, phym1+2) of sco7697 gene with the GUS reporter gene encoding ß-glucuronidase activity. Thus as expected, we demonstrated that the deletion of the PHO box located upstream of the -35 reduces the level of induction of sco7697 in conditions of Pi limitation. Moreover, we have revealed for the first time that the alteration of RD located downstream of -10 correlates with a dramatic increase of GUS expression when PhoP is present. Our results demonstrate that this RD is the seat of a strong negative regulation by an unknown repressor. This would prevent the PhoP-dependent activation of expression of the phytase gene
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
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