1,720,953 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
Exploring the Copper (I) and Iron (III) Binding to Recombinant Wild-type FtrB from Brucella abortus: Role of Cu-ion in the FtrABCD Iron Transport System in Gram-Negative Pathogens
No full textFtrABCD is a four-component Fe²⁺ active transporter found in several Gram-negative pathogens, including Brucella and Bordetella spp. Co-expression of these proteins is essential for the survival of these organisms inside the host where these pathogens encounter iron-restricted environment due to host immune response. Based on protein homology and evolutionary data for FtrC, it is hypothesized that this permease uses the free energy (ΔG) derived from Fe²⁺ oxidation to perform the active transport of its cargo. A similar permease, Ftr1p, is found in yeast, and experiments have confirmed that Fe2+ oxidation is required for iron utilization by Ftr1p. In this yeast system, Fe2+ oxidation is done by a co-expressed multicopper oxidase (MCO), Fet3p. The proteins co-expressed with FtrC (FtrA, FtrB, and FtrD) are not MCOs and the soluble components, periplasmic FtrA and FtrB do not belong to any known families of redox proteins. Phylogenetic studies on FtrB and known single and multidomain copper redox proteins have shown that FtrB is evolutionarily related to Fet3p. Based on this, it was proposed that Brucella abortus FtrB is a novel and uncharacterized copper redox protein
and can perform the following reaction—
Cu2+-FtrB + Fe2+ Cu2+-FtrB-Fe2+ (aq) Cu+-FtrB-Fe3+ (aq)
For FtrB to be an effective redox protein and perform the above reaction, it must bind Cu2+, Cu+, Fe2+, as loss of Cu+ from FtrB will terminate its redox activity. As free Fe3+ is toxic and insoluble, it is also predicted that Fe3+ produced by Cu2+-FtrB must stay bound to reduced FtrB until it gets recognized by the permease, FtrC, and is translocated. The ability of recombinant wild-type FtrB to bind Cu2+ and a Fe2+ mimic were determined by another undergraduate researcher from my lab. This thesis describes experiments performed by me and were performed to establish if FtrB can stay bound to Cu⁺ and Fe3+. To investigate if Cu⁺ and Fe³⁺ bind to FtrB, we used Ag⁺ and Ga³⁺ as mimics for Cu⁺ and Fe³⁺, respectively. These mimics were chosen because Cu⁺ and Fe³⁺ are unstable and can oxidize quickly, making them difficult to work with directly. Ag⁺ and Ga³⁺ provide similar coordination chemistry and binding properties, allowing for accurate modeling of the interactions without these complications. Isothermal titration calorimetry (ITC) was performed by titrating Ag⁺ into apo-FtrB in water at neutral pH, showing strong binding (Kd ~ 3 µM, N ~1). Further ITC experiments with Ga³⁺ and Ag⁺-FtrB revealed two distinct binding sites for Ga³⁺. The first site showed a stoichiometry (n) of 2.844, a dissociation constant (Kd) of (1.208 ×10-5) M, a positive change in enthalpy (ΔH) of 28.94 kcal/mol, and a substantial increase in entropy (ΔS) of (1.196 × 102) cal/mol·K. The second site exhibited a stoichiometry (n) of 10, a dissociation constant (Kd) of (1 ×10-3) M, a negative change in enthalpy (ΔH) of -8.378 kcal/mol, and a decrease in entropy (ΔS) of -14.37 cal/mol·K. These findings enhance our understanding of the metal-binding properties of FtrB and its role in ion homeostasis, emphasizing the importance of these interactions for the protein's biological function.
To determine if recombinant wild-type FtrB can bind Cu²⁺ specifically, I performed circular dichroism (CD) spectroscopy on as isolated wild-type FtrB as it is exposed to other divalent transition metal ions during its expression and purification. I used the signature Cu²⁺-His CD peaks to establish the presence of Cu²⁺ in as isolated wild-type FtrB
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
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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