1,720,954 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
No full textWe 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
Role of Cardiac Myocyte-Specific Deletion of Ataxia Telangiectasia-Mutated Kinase in Heart Function
No full textRole of Cardiac Myocyte-Specific Deletion of Ataxia Telangiectasia-Mutated Kinase in Heart Function Abbey Laughlin1, Krishna Singh2,3,4, Suman Dalal1,2,3 1Department of Health Sciences, College of Public Health, 2Department of Biomedical Sciences, James H Quillen College of Medicine, 3Center of Excellence for Inflammation, Infectious Disease and Immunity, East Tennessee State University Johnson City, TN 37614, 4James H Quillen Veterans Affairs Medical Center, Mountain Home, TN 37684 Background: Ataxia Telangiectasia-Mutated Kinase (ATM) is a serine/threonine kinase crucial in DNA repair. Individuals with mutations in the ATM gene develop a rare autosomal disease known as Ataxia-telangiectasia (A-T). A-T is characterized by multiorgan system dysfunction which may include cardiovascular, immune, endocrine, and neurological abnormalities. Previous work has shown that whole-body ATM knockout (KO) mice die between 2 to 4 months of age due to thymic lymphoma. M-mode echocardiography showed that 2-month-old ATM KO mice exhibit reduced left ventricular (LV) dilation with no significant change in percent fractional shortening (%FS) and ejection fraction (%EF) versus their wild-type counterparts. Objective: This study aims to examine if cardiac myocyte-specific deletion of ATM induces LV dilation and cardiac dysfunction. Methods: ATM flox/flox (129-Atmtm2.1Fwa/J, strain# 021444) and αMyHC-cre (Myh6-cre, strain# 011038) mice, obtained from Jackson Laboratory, were crossbred to generate cardiac myocyte-specific ATM knockout mice. All mice were genotyped by PCR using primers suggested by the Jackson Laboratory. ATM flox/flox+αMyHC-cre (fl/fl/cre) served as an experimental group with cardiac myocyte-specific deletion of ATM, while ATM flox/flox (fl/fl) and αMyHC-cre (MHC) mice served as control groups. LV diameters and heart function were measured in all groups at 1- and 4-month of age using echocardiography. Results: Analysis of M-mode echocardiographic images showed significant increase in LV end diastolic diameter in fl/fl/cre versus fl/fl in mice aged 4 months. However, %FS and %EF remained unchanged at both time points among the groups. Conclusion: Cardiac myocyte-specific deletion of ATM affects LV dilation with no effect on systolic function in mice. Future studies are forthcoming to investigate if cardiac myocyte-specific deletion of ATM affects structural and functional parameters of the heart in older (\u3e4 months of age) cohorts of mice. This research was supported by the Department of Health Sciences and the Department of Biomedical Sciences
Cardiac Myocyte-Specific Deletion of Ataxia Telangiectasia-Mutated Kinase (ATM) Induces Left Ventricular Dilation and Systolic Dysfunction
No full textBackground: Mutations in ATM gene cause an autosomal disease known as Ataxia-telangiectasia (A-T). Whole-body ATM knockout (KO) mice die ~2 to 4 months of age. At ~2 months of age, these mice exhibit reduced left ventricular (LV) dilation with no change in percent fractional shortening (%FS) and ejection fraction (%EF) versus wild type. This study investigated if cardiac myocyte-specific deletion of ATM induces LV dilation and cardiac dysfunction. Methods: Cardiac myocyte-specific ATM KO mice (fl/fl/cre) and their controls (flox/flox; fl/fl) were generated by cross breeding of ATM flox/flox and αMyHC-cre mice. Cardiac structural and functional parameters were measured using echocardiography. M-mode images were used to measure %FS, %EF, LV end-systolic (ESD) and end-diastolic (EDD) diameters, end-diastolic (EDV) and end-systolic (ESV) volumes in mice aged 4 and 8 months. Results: Cardiac myocyte-specific deletion of ATM significantly increased EDD in fl/fl/cre versus fl/fl mice aged 4 months. However, a significant decrease in %FS and %EF was observed in fl/fl/cre versus fl/fl group in mice aged 8 months. Conversely, fl/fl/cre exhibited a significant increase in ESD, EDD, ESV, and EDV versus fl/fl mice. Conclusion: Thus, cardiac myocyte-specific deletion of ATM induces LV dilation in mice aged 4 & 8 months and systolic dysfunction in mice aged 8 months. This research was supported by the Department of Biomedical Health Sciences and the Department of Biomedical Sciences
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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