1,720,967 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
REVIEW: The Effects of Parental Phthalate Exposure on Newborn Defects
Get PDFPhthalates, or phthalate esters, are employed in the making of numerous products around the world, such as food containers, children’s toys, detergents, surfactants, household items, and even pharmaceutical tablets. With the flexibility, elasticity, and inexpensive price, companies started using phthalates without doubting their acute and chronic toxicity. Recent research suggests that phthalate esters are possible causes of asthma, obesity, type II diabetes, neurodevelopmental issues, heart diseases, cancer, and especially reproductive system issues. However, studies about the effects of phthalates on fetal development are rare. To summarize updated data on this field, this review poster covers the most prominent in vivo studies, both animal models and humans, regarding phthalates exposure during pregnancy to newborn defects. Additionally, novel hypotheses on molecular mechanisms and important suggestions are provided to minimize possible negative outcomes of phthalate applications
The Role of \u3cem\u3eCol11a1\u3c/em\u3e Expression During Cartilage Development
Get PDFIt is currently a major scientific and medical goal to identify and characterize genetic defects and their impact in health and disease. For example, mutations in genes that encode collagen alpha chains can cause skeletal dysplasia and lead to premature degenerative joint disease. Collagen is the main structural protein in the ECM of connective tissues such as the cartilage, joints, ligaments and tendons. Therefore, the goal of this research is to define the impact of the alpha one chain of collagen type XI chain, encoded by the COL11A1 gene in humans, on chondrocyte behavior during development of the cartilage. We hypothesize that altered expression of COL11A1 dysregulates chondrocyte behavior during cartilage development by altering β-catenin dependent signaling pathways. To test this hypothesis, we inhibited the expression of the COL11A1 homolog col11a1a in transgenic zebrafish expressing green fluorescence protein in neural crest derived cells and osteoblast. Then, the col11a1a deficient zebrafish were imaged by confocal microscopy to analyze the organization of cells contributing to craniofacial development. Inhibiting col11a1a expression reduced the size and shape of the developing Meckel’s cartilage in zebrafish. These changes occurred because the cells failed to form the hallmark columns that normally promote longitudinal growth. In addition, premature and ectopic mineralization was found to occur in the cartilage tissue of the Meckel’s cartilage. Additional investigation using the well-established embryonic mouse cell line ATDC5 led to the identification of changes in post translational modification of proteins which regulate cell behavior. Specifically, the AKT/GSK3β/β-catenin proteins were modified to increase the activity of the transcription factor TCF/LEF. This activation was coupled to 1) changes in gene expression, 2) decreased cartilage growth, and 3) increased mineralization. In conclusion, the results confirm that loss of COL11A1 homolog expression in zebrafish (col11a1a) and mouse (Col11a1) cells leads to severe chondrodysplasia that affects cells behavior and tissue shape. Treatment enhancing COL11A1 protein production in humans may be useful in inhibiting excessive mineralization. On the other hand, inhibition of COL11A1 protein production could be useful for tissue engineers and researchers developing treatments to accelerate the mineralization of cartilage during fracture healing in patients
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
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