1,722,360 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
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
Molecular advances in rootstock-scion interaction in grapevine
No full textIn grapevine, grafting is a worldwide used technique employed to confer resistance to pests and diseases, to improve abiotic stress tolerance and to control plant vigour and some qualitative traits. Despite the relevance of rootstock, knowledge of the molecular mechanisms implicated in the rootstock-scion interaction still has many gaps. Only, recently, some experiments have been performed to investigate the effects of grafting technique, different soils and rootstocks on scion at transcriptomic level. This work reviews the most relevant findings in this field. These recent advances open a new perspective for a molecular interpretation about the interaction between scion and rootstock as well soil substrates
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
Transcriptional and Posttranscriptional Regulation of Drought Stress Treatments in Brachypodium Leaves
No full textPlant sensing drought stress conditions activate complex molecular networks leading to a rapid reprogram- ming of plant physiology and metabolism, in order to survive in suboptimal conditions.
Here, we describe a standardized in vivo soil drought assay to investigate the effects of drought stress on leaf growth. Since it is now clear that stress responses can be specific to developmental stages and cell types, we describe a procedure to dissect the leaf in three distinct areas in order to study transcriptional and posttranscriptional gene regulation on both organ and cellular levels. Noncoding RNAs, both small RNAs and long noncoding RNAs, are emerging to be deeply involved in abiotic stress responses, acting as molecular switches, interconnecting different response pathways. Here, we illustrate the methodology that has been used to identify miRNAs involved in drought response and to analyze the modulation of expression of their putative targets, in order to gain a complete picture of transcriptional and posttranscrip- tional regulation driven by noncoding RNAs
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