1,720,958 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
Production of clonal founders in the European sea bass, Dicentrarchus labrax L., by mitotic gynogenesis
No full textReproduction by mitotic gynogenesis was carried out in European sea bass, Dicentrarchus labrax L., by fertilizing eggs from three normal and one meiotic gynogenetic females with UV-irradiated sperm. The haploid chromosome set was then doubled by applying a pressure shock at 81 or 91 MPa for 4 min at the time of the onset of the first cleavage furrow in order to obtain four progenies of mitotic gynogenetic double haploid (G2N) fish. Haploids, tetraploids and normal diploids were also produced as controls. Survival of G2N prelarvae was 7-18% of that of normal diploids. The diploid status of G2Ns was verified by flow cytometry, while maternal chromosome inheritance was confirmed by unilocus analysis of six microsatellites amplified by hexaplex PCR and by the precocious death of haploid controls. Two progenies were found to be completely homozygous for the heterozygous maternal microsatellite alleles while, in the other two progenies, only 92% and 95% of the fish were fully homozygous, as 7 fishes were heterozygous at one locus, 6 at two, and 1 at three loci. Similar small percentages of triploid fish were found within the corresponding tetraploid controls. No increment of heterozygous or triploid fish was observed in successive samplings. In the most numerous progeny, 100 fish have been raised for 2 years and some of them are essentially of normal appearance. In these G2Ns, 16 double haplotypes were found on the basis of the 6 microsatellite loci analyzed. The possible use of G2Ns as clonal founders for sex control and performance improvement is discussed
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
Assessment of homozygosity and fertility in meiotic gynogens of the European sea bass (Dicentrarchus labrax L.)
No full textAnalysis of 5-6 microsatellite loci was used to measure the increment of homozygosity in two meiogynogenetic progenies (A and B) of sea bass with respect to their mother. In progeny A and B, 20% and 12% of the meiogynogens retained heterozygosity for all investigated maternal loci, respectively, while complete homozygosity was observed only in 6% of B and in none of A, indicating the occurrence of significant allelic recombination during meiosis. The overall increment of homozygosity for the investigated loci was 27% for A and 47% for B. Although survival at hatching of meiogynogens was about half that of controls, they subsequently grew as controls and displayed the same onset of puberty and reproductive potential at adulthood during three consecutive years when crossed between themselves (11 crosses) or with control fish (13 crosses). In particular, meiogynogenetic females (n=24) underwent vitellogenesis and yielded eggs of good quality upon stimulation with LH-RH analogue similarly to normal fish. Sperm released by meiogynogenetic males (n=23) was equivalent to that of controls in terms of volume, quality and fertilization capability. Second generation meiogynogens were obtained by chromosome set manipulation from meiogynogenetic females and found to be morphologically normal at 3 years of age. Interestingly, under our culture conditions, the percentage of meiogynogenetic males in the second generation was 7% as opposed to 39% in the first generation
Numerical-experimental study on the crashworthiness of a windshield A-pillar
Full text linkThis document reports a numerical and experimental crashworthiness study of a vehicle structural component. Particularly, a windshield A-pillar made of a novel high-strength steel was tested on an apparatus for impact tests that was in-house designed so as to reproduce the effects of a vehicle side impact crash. In parallel, numerical simulations were performed using the explicit finite element code LS-DYNA, considering different elastic-plastic material constitutive laws with damage. A comparison between numerical and experimental outcomes demonstrated a satisfactory correlation, with the GISSMO model that provided a good correlation and needed a relatively low computational effort
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
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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