1,720,962 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
Single-Molecule STED Microscopy with Photostable Organic Fluorophores
No full textKasper R, Harke B, Forthmann C, Tinnefeld P, Hell SW, Sauer M. Single-Molecule STED Microscopy with Photostable Organic Fluorophores. SMALL. 2010;6(13):1379-1384
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
Development and application of super-resolution fluorescence microscopy
Full text linkFür eine drastische Erweiterung des Anwendungsfeldes der optischen Mikroskopie sorgte die in den letzten Jahren aufgekommene sogenannte Superauflösungsmikroskopie. Das klassische Modellsystem, um das Auflösungsvermögen derartiger Techniken zu vergleichen und zu quantifizieren, stellen Komponenten des eukaryontischen Zytoskeletts dar. Auch im Rahmen dieser Arbeit wurden derartige Zellstrukturen verwendet und anhand dessen ein quantitativer Wert für die Auflösung der Blink-Mikroskopie erhalten. Das System der Wahl waren dabei Aktinfilamente in vitro, in fixierten und in lebenden Zellen. Darüberhinaus wurde auch ein deutlich systematischerer Ansatz verfolgt, indem eine Matrix aus gezielt angeordneten Farbstoffmolekülen als Vergleichssystem verwendet wurde. Dabei wurde die gezielte Platzierung sowohl virtuell in Monte-Carlo-Simulationen, als auch real mithilfe eines Rasterkraftmikroskops durchgeführt. Die Platzierung von Farbstoffmolekülen durch die Verwendung von Rasterkraftmikroskopie wies allerdings einige Nachteile auf, wie etwa eine sehr aufwändige Durchführung und das Fehlen einer Möglichkeit zur Parallelisierung. Aus diesem Grund wurde im Folgenden auf die sogenannte DNA-Origami-Technik zurück gegriffen, um gezielte Farbstoffanordnungen zu generieren. Diese dienten nun als Testprobe sowohl für die Blink-Mikroskopie, als auch für die superauflösenden Techniken PAINT und SHRImP. Schließlich wurden DNA-Origamis als generelle Auflösungsstandards für die lokalisierungsbasierte Superauflösungsmikroskopie etabliert, wobei zur automatisierten Auswertung ein spezieller Algorithmus entwickelt wurde. Die Erweiterung auf den dreidimensionalen Fall gelang durch die Nutzung von Astigmatismus-basierter 3D-Lokalisierungsmikroskopie und die Verwendung einer speziell dafür designten dreidimensionalen DNA-Origami-Struktur. Die Möglichkeit einer unkomplizierten Auswertung wurde auch in diesem Fall durch die Entwicklung eines automatisierten Detektionsalgorithmus sichergestellt.In recent years the so called super-resolution microscopy yielded to a dramatic increase of applications in optical microscopy. The common used model system to compare and quantify the resolution values of those techniques is given by components of the eukaryotic cytoskeleton. Also within this work those cell structures were used for gaining a quantitative value of the resolution of Blink Microscopy. Thereby the systems of choice were actin filaments in vitro, in stained cells and in living cells. Furthermore a much more systematic approach was carried out by using a matrix of regular arranged dye molecules as a comparison system. Thereby the accurate placement was done virtually in Monte-Carlo-simulations as well as in reality by using an atomic force microscope. However, the arrangement of fluorescent molecules by using an atomic force microscope contains a number of disadvantages, e.g. the quite high effort of the process and the lack of possibilities for parallelization. For this reason in the following the so called DNA origami technique was used for generating specific arrangements of dye molecules. These structures now functioned as calibration probe for Blink Microscopy as well as for the super-resolution techniques PAINT and SHRImP. Finally DNA origamis were established as general resolution standards for localization based super-resolution microscopy. Thereby for automated data analysis a specific algorithm was developed. The expansion to the three-dimensional case succeeded by applying astigmatism-based 3D-localization-microscopy to a specific for this case designed three-dimensional DNA-origami-structure. The option for uncomplicated data analysis was also ensured by developing of an automatic detection algorithm
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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