1,721,111 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
Structural and dynamic features of telomeric chromatin
No full textTelomeres are the specialized nucleoprotein structures that protect the ends of eukaryotic chromosomes. Vertebrate telomeres consist of several kb of double-stranded TTAGGG repeats, ending in 100-200 bases of single-stranded TTAGGG, named 3’-overhang. Protection of chromosome termini is achieved through the establishment of specialized structures, whose precise organization is not known yet. Telomeres are organized in nucleosomal arrays, with an unusually shorter spacing than bulk chromatin. Little is known about their role in the higher order telomeric chromatin structure.
In order to investigate structural features of telomeric chromatin, in this thesis a model system has been developed and studied at single molecule level by Atomic Force Microscopy (AFM) imaging. Human telomeric nucleosomal arrays, reconstituted on a 1500 bp long telomeric DNA have been analyzed. The same nucleosomal arrays have also been studied by a theoretical method, which derives nucleosomal positioning from the sequence-dependent DNA mechanical properties (curvature and flexibility). A satisfactory correlation between the theoretical and experimental results has been obtained, suggesting a relevant role of DNA sequence in telomeric chromatin basic organization. Both the experimental and theoretical telomeric nucleosome positioning appear characterized by nucleosome dyad axis multiple positioning with the six bp periodicity of human telomeric DNA. Moreover, the barriers between adjacent free energy minima of nucleosome formation are so low that it is possible to consider the nucleosomal organization on human telomeric DNA as almost continuous and the nucleosomes as free moving along DNA. These features suggest a higher mobility of telomeric nucleosomes with respect to that of bulk nucleosomes.
Since the intrinsic mobility of telomeric nucleosomes could be a relevant feature in telomeres dynamics, a model system has been set up to study nucleosome mobility. A construct has been realized, in which nucleosomes, initially located at the end of an 800 bp long DNA fragment, are adjacent to a strong nucleosome positioning sequence that should act as a nucleosome trap. By a restriction enzyme assay and AFM imaging it has been found a significant higher mobility of telomeric nucleosomes than average sequence nucleosomes. In fact, the mobility of telomeric nucleosome increases rising the temperature and the ionic strength. Moreover, the telomeric nucleosome mobility is influenced by specific telomeric protein, hTRF1, since hTRF1 binding to telomeric nucleosome gives rise to significant nucleosome repositioning
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
Antefatti delle interferenze tra greco e romanzo in Italia meridionale : il suffisso -(V)lo- e le geminazioni consonantiche
No full textDispelling 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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