1,720,958 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
Avian metapneumoviruses expressing Infectious Bronchitis virus genes are stable and induce protection
No full textThe study investigates the ability of subtype A Avian metapneumovirus (AMPV) to accept foreign genes and be used as a vector for delivery of Infectious bronchitis virus (IBV) QX genes to chickens. Initially the GFP gene was added to AMPV at all gene junctions in conjunction with the development of cassetted full length DNA AMPV copies. After recombinant virus had been recovered by reverse genetics, GFP positions supporting gene expression while maintaining virus viability in vitro, were determined. Subsequently, either S1 or nucleocapsid (N) genes of IBV were positioned between AMPV M and F genes, while later a bivalent recombinant was prepared by inserting S1 and N at AMPV MF and GL junctions respectively. Immunofluorescent antibody staining showed that all recombinants expressed the inserted IBV genes in vitro and furthermore, all recombinant viruses were found to be highly stable during serial passage. Eyedrop inoculation of chickens with some AMPV-IBV recombinants at one-day-old induced protection against virulent IBV QX challenge 3 weeks later, as assessed by greater motility of tracheal cilia from chickens receiving the recombinants. Nonetheless evidence of AMPV/IBV seroconversion, or major recombinant tracheal replication, were largely absent
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
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
Avian metapneumovirus studies using reverse genetics
No full textAvian metapneumovirus (AMPV) is an enveloped negative sense single stranded RNA virus which is a major endemic respiratory pathogen of global domestic poultry. Since reverse genetic (RG) techniques have been applied to this pathogen several reports have investigated the effects of single and multiple genomic mutations and gene deletions or insertions on viral biology. The aim of this study was to gain a better understanding of the viral capacity to accept and in some cases express homologous and heterologous extra sequences.
Initially an AMPV subtype A was modified to introduce a homologous 200 bp sequence within the G gene and this recombinant was suggested to be used as a positive control for validating all stages of a previously established RT-nested PCR.
Different Green Fluorescent Protein (GFP) AMPV recombinants were then prepared each one containing the reporter gene in a different intergenic position and then were assessed for expression, stability and viability. In particular, quantification of the expression was calculated using a quantitative ELISA. All recombinants showed high stability, while good viability was observed in all the positions, except when GFP was inserted between nucleocapsid (N) and phosphoprotein (P). The highest expression was detected in the virus with the insertion between N and P as expected, according to the transcriptional model for non-segmented negative stranded viruses. However GFP was produced at high levels even when inserted at the trailer end intergenic positions. Poor expression was seen for all the other positions.
The vectoring abilities of subtype A strains were further investigated to accept and express foreign genes, specifically GFP gene and both spike (S1) and nucleocapsid (N) genes of infectious bronchitis virus (IBV). After viruses had been recovered by RG, all recombinants were proven to express the inserted genes efficiently and were all found to be highly stable during passage in vitro. Subsequently IBV recombinants were tested as candidate vaccines by eye-drop inoculation of one-day-old chickens. When chicks were challenged with IBV, partial protection results were observed, as assessed by greater motility of tracheal cilia from animals receiving the recombinants.
Finally the development of a new RG system was attempted in order to extend this type of studies to the B subtype. This subtype is distributed worldwide and growing field evidence suggests it to be more able to infect commercial chickens compared to subtype A. For this reason it would be convenient to have an RG available also for B viruses. The construction of a DNA copy of the viral genome was attempted using site-directed mutagenesis and ligation techniques, resulting in more than 85% of the genome cloned. Unfortunately full genome cloning proved to be not possible, as severe problems were encountered, including construct instability and cloning bacteria intolerance to viral sequences
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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