1,720,988 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
Fluorescence-based DNA minisequence analysis for detection of known single-base changes in genomic DNA.
No full textWe describe a rapid, automated method for direct detection of known single-base changes in genomic DNA. Fluorescence-based DNA minisequence analysis is employed in a template-dependent reaction which involves a single nucleotide extension of an oligonucleotide primer by the correct fluorescently-tagged dideoxynucleotide chain terminator. Detection following electrophoresis on denaturing acrylamide gels is facilitated by alkaline phosphatase treatment of reaction products after extension followed by isopropanol precipitation of the dye-tagged, single-base-extended primer to remove unincorporated deoxynucleotides. Fluorescence analysis of the incorporated dye tag reveals the identity of the template nucleotide immediately 3' to the primer site. This technique does not require radioactivity or biotinylated PCR product, relies on the incorporation of a single dideoxynucleotide terminator to extend the primer by one nucleotide and takes advantage of the sensitivity of fluorescent terminators developed for automated DNA sequence analysis. As a demonstration, we have applied the assay to human genomic DNA for detection of the sickle mutation in the beta-globin gene, and have also examined feasibility for simultaneous delineation using a multiplex-like strategy in a single gel-lane of some of the most common beta-thalassemia mutations in the Mediterranean basin
Parallel molecular genetic analysis.
No full textWe describe recent progress in parallel molecular genetic analyses using DNA microarrays, gel-based systems, and capillary electrophoresis and utilization of these approaches in a variety of molecular biology assays. These applications include use of polymorphic markers for mapping of genes and disease-associated loci and carrier detection for genetic diseases. Application of these technologies in molecular diagnostics as well as fluorescent technologies in DNA analysis using immobilized oligonucleotide arrays on silicon or glass microchips are discussed. The array-based assays include sequencing by hybridization, cDNA expression profiling, comparative genome hybridization and genetic linkage analysis. Developments in non microarray-based, parallel analyses of mutations and gene expression profiles are reviewed. The promise of and recent progress in capillary array electrophoresis for parallel DNA sequence analysis and genotyping is summarized. Finally, a framework for decision making in selecting available technology options for specific molecular genetic analyses is presented
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
Nucleic acid detection using non-radioactive labelling methods.
No full textNucleic acid probe-based assays are now widely used in genetic research, human identification, forensics and in a broad spectrum of clinical assays in the fields of microbiology, haematology/oncology and virology. Labelled probes are used in a variety of assay formats including dot-blots, Southern blots (DNA target), Northern blots (RNA target), Western blots (protein target), in situ hybridization, plaque or colony screening and immobilized arrays on silicon or glass surfaces. Traditionally, the probes used in these assays have a radioactive 32phosphorous label that has a short shelf-life, is dangerous, has high disposal costs and, when labelled to high specific-activity, may be unstable. Extensive efforts to develop alternative labelling techniques have resulted in colorimetric, chemiluminescent and fluorescent assay formats. This review summarizes the properties desired in a probe, describes the advantages and disadvantages of the different non-radioactive labelling strategies, and illustrates examples of probe-based assays in which detection is facilitated by imaging samples using a general purpose fluorescence scanner
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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