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
Genetic characterization of Calabrese and Casertana pig ancient autochthonous genetic types (AAGT) at CRC locus
No full textCalcium Release Channel (CRC) is a “candidate DNA segment encoding protein (gene)” of high interest for pork quality. It maps on the short arm of chromosome 6 and has two allelic forms: N (normal dominant allele) and n [mutated recessive allele, also known as “halothane sensitivity” allele (Haln)]. Haln is due to a point mutation (SNP, single nucleotide polymorphism) which consists in the transition of a thymine nucleotide base for a cytosine at position 1843 in the 134 bp exon, responsible for the synthesis of a protein containing a substitution of an “arginine” for a “cysteine” at position 615; in the muscle fiber this substitution induces anomalies in the calcium flow regulation at sarcoplasmic reticulum level (ionic calcium deregulation). This deregulation in pig species is manifested as PSS (Porcine Stress Syndrome). Meat of PSS animals displays PSE (Pale Soft Exudative) myopathy, which makes meat less acceptable to consumer and poorly suitable to transformation in products of a good quality.
The individuation of the point mutation allowed to set up a fast and efficient “genetic prophylaxis” test based on the genotype determination at CRC locus in order to detect heterozygous carriers of mutated allele and their incidence. In fact, the halothane test does not distinguish between the heterozygous (Nn) and homozygous normal (NN) animals, because both of these genotypes are non reactive. Furthermore, some nn subjects are halothane negative due to incomplete penetrance. In order to individuate the possible presence of mutated allele within Casertana (CT) and Calabrese (CA) AAGTs, a genetic screening was performed on 110 subjects of CT AAGT and 40 CA AAGT pigs, reared at ConSDABI experimental farm, using PCR-RFLP (Polymerase Chain Reaction - Restriction Fragment Lenght Polymorphisms) method. The results showed that all Casertana AAGT pigs were NN (100%) while in AAGT Calabrese the frequencies of NN and Nn genotypes were 75% and 25% respectively. No nn genotype was found in the tested animals. It is opportune to specify that familiar relationships exist between Calabrese subjects, due to the reduced consistency of pig population. These results, valid within the observation field, confirm what found in a previous research in which Casertana was different from Calabrese and Nero Siciliano AAGTs for genotypic frequencies values: NN: 100,0% vs 65,5% vs 93,9%, respectivel
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
‘Nero Lucano’ pig ancient autochthonous genetic type (AAGT): Genetic characterization by microsatellite analysis preliminary results.
No full textThe recovery of AAGTs represents an example of integration between environmental and productive goals. The aim of this study was to privide, by means of typification of 41 subjects to 19 microsatellite loci, a first contribution to the knowledge of the genetic variability of 'Nero Lucano', whose origins could go back to the ancient pig present in Lucania region (Italy). The results, within the limits of the observation filed, evidenced an average allele number per locus equal to 3,2±0,89 (c.v. = 28 %) ranging from 5.0 for SW 2038 locus and 1 for SO 386 locus; on the contrary, the latter locus is polymorphic in other 12 AAGTs (2-9) alleles). The mean observed and expected heterozygosity were 49,13 ± 22,44 (c.v. = 46 %) and 47,86 ± 18,02 (c.v. = 38 %), respectively. These preliminary results must be confirmed by increasing sampling. Indeed, monomorphism of SO 386 locus might be used for genetic discrimination of meat and its. products
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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