1,720,965 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
Mutationssuche im FSH-Rezeptor-Gen bei Frauen mit herabgesetzter ovarieller Stimulierbarkeit im Rahmen der künstlichen Befruchtung
Get PDFBackground IVF and ICSI are the main procedures of assisted reproduction technologies (ART) becoming increasingly relevant. Ovarian stimulation with gonadotropins is an essential part of the IVF procedure in order to obtain more than one follicle. In some women, referred to as “low responders”, only few follicles develop in spite of maximum stimulation, resulting in a decreased pregnancy rate. Next to age-related premature ovarian failures (POF), mutations in the FSH receptor gene could be possible causes of a low response. The goal of this thesis was to investigate into the genomic FSH receptor mutations and polymorphisms and to compare the frequencies in patients with low response with the findings in certain control groups. Additionally, anti-Mullerian hormone (AMH), a marker protein secreted by growing preantral follicles, was evaluated. Methods Women with proven low ovarian response (“low responders”) were contacted and asked to give blood samples. In addition to this, two control groups were established: IVF/ICSI-patients with the normal ovarian response and women who had at least one pregnancy and no fertility treatment in their history (“no ART”). Genomic DNA was extracted from the blood samples, which was subsequently tested for inactivating (Ala189Val, Ile160Thr, Asn680Ser) as well as activating single-nucleotide polymorphisms (SNP´s) by means of Realtime-qPCR. Additionally, AMH concentration in serum was quantified with an appropriate Enzyme-linked Immunosorbent Assay (ELISA). Statistical analysis was carried out with the help of the Statistical Program for the Social Sciences (SPSS 16.0). Results No homozygote SNP´s were found in all of the three patient groups except for the known and frequently found Asn680Ser polymorphism. No difference in distribution of the inactivating FSHR receptor mutations in the three groups could be detected. A somewhat elevated frequency of heterozygous Ile160Thr of marginal significance was found in patients treated for sterility (both “low responders” and IVF/ICSI patients with a normal ovarian response) (n=156) compared with the group of women with a normal fecundity (“no ART”) (p=0,046). The analysis of the Asn680Ser SNP distribution revealed a more frequently expressed homozygous Ser680/Ser680 polymorphism in IVF/ICSI-patients compared to the “no ART” control group, which was, however, of no significance. No activating FSHR-mutations were detected in the group of women with a low ovarian response. Since most “low responders” had low or very low AMH levels, this was attributed to a depleted pool of ovarian follicles. This per se was regarded the cause of low ovarian response. Conclusions The rational of this study was to show that FSH receptor mutations have an implication in low ovarian response to gonadotropin stimulation. However, no significant correlation of the analyzed mutations and a related low ovarian response could be found. To address the relevance of mutations and polymorphisms of the FSH receptor gene in “low responders”, more complex studies with a larger number of patients are required.Hintergrund und Ziele IVF und ICSI sind die wichtigsten Methoden in der Reproduktionsmedizin, die an Bedeutung immer weiter zunehmen. Die Stimulation der Eierstöcke mit Gonadotropinen ist ein essentieller Bestandteil der IVF-Behandlung, damit sich mehr als ein Follikel entwickelt. Bei einigen Frauen, den sog. „Low Respondern“, reifen trotz Stimulation mit Gonadotropinen nur wenige Follikel heran und die Wahrscheinlichkeit einer Schwangerschaft sinkt. Neben einer altersbedingten geringen Stimulierbarkeit aufgrund einer erniedrigten ovariellen Reserve werden auch Defekte im FSH-Rezeptor-Gen als Ursache diskutiert. Das Ziel dieser Arbeit war es, nach Veränderungen im FSHR-Gen zu suchen und die Häufigkeit von bestimmten Mutationen oder Polymorphismen bei Patientinnen mit Kontrollpatientinnen zu vergleichen. Zusätzlich sollte die Bedeutung des Anti-Müller-Hormons (AMH) als möglicher prädiktiver Faktor für die ovarielle Reserve bzw. ovarielle Antwort auf eine Hormon-Behandlung überprüft werden. Methoden Es wurden Frauen mit einer nachgewiesenen schwachen ovariellen Stimulierbarkeit („Low Response“) angeschrieben und um eine Blutentnahme gebeten. Ergänzend dazu wurden zwei weitere Kontrollgruppen, IVF-Patientinnen mit normaler Stimulierbarkeit und Frauen, die auf natürlichem Wege schwanger wurden, gebildet. Aus den Blutproben wurde die DNA extrahiert und anschließend mittels Realtime-qPCR auf inaktivierende (Ala189Val, Ile160Thr, Asn680Ser) und aktivierende (Thr449Ile) Single-nucleotide polymorphismus (SNP´s) untersucht. Zusätzlich wurde AMH im Serum mittels ELISA bestimmt. Die statistische Auswertung erfolgte mittels Statistical Package for the Social Sciences (SPPS 16.0). Ergebnisse und Beobachtungen Außer dem häufigen Asn680Ser Polymorphismus wurden in keiner der drei Patientengruppen homozygote SNP´s gefunden. Es konnte kein Unterschied in der Verteilung inaktivierender FSHR-Veränderungen in den drei Gruppen gefunden werden. Lediglich in der Gesamtgruppe der IVF-Patientinnen (n=156) zeigte sich eine knapp signifikante Häufung der heterozygoten Ile160Thr-Variante im Vergleich zu Frauen mit einer normalen reproduktiven Funktion (p=0,046). Die Untersuchung der Verteilung der Asn680Ser Genveränderungen ergab, dass die homozygote Serin-Variante häufiger bei den IVF-Patientinnen zu finden war als bei den Frauen, die auf natürlichem Wege schwanger wurden. Dieses war aber nicht signifikant. Es wurden in der Gruppe der Frauen mit geringer ovariellen Stimulierbarkeit keine aktivierenden FSHR-Mutationen gefunden. Bei den meisten „Low Responder“ wurden niedrige Serum AMH-Werte festgestellt, als Zeichen einer geringen ovariellen Reserve und damit Stimulierbarkeit. Praktische Schlussfolgerungen Im Rahmen dieser Arbeit sollte gezeigt werden, dass FSHR-Varianten eine Rolle bei einer schlechten ovariellen Antwort auf die Gonadotropin-stimulation spielen. Es konnte allerdings kein eindeutiger Zusammenhang zwischen den untersuchten genetischen Veränderungen und einer unzureichenden Stimulierbarkeit der Eierstöcke mit FSH festgestellt werden. Möglicherweise werden weitere umfangreichere Studien notwendig sein, um der Bedeutung der inaktivierenden FSHR-Mutationen und Polymorphismen bei Frauen mit sog. „Low Response“ näherzukommen
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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