1,721,249 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
An in vitro transposon system for highly regulated gene expression: construction of Escherichia coli strains with arabinose-dependent growth at low temperatures
No full textPlacing a gene of interest under the control of an inducible promoter greatly aids the purification, localization and functional analysis of
proteins but usually requires the sub-cloning of the gene of interest into an appropriate expression vector. Here, we describe an alternative
approach employing in vitro transposition of Tn?PBAD to place the highly regulable, arabinose inducible PBAD promoter upstream of the gene to be expressed. The method is rapid, simple and facilitates the optimization of expression by producing constructs with variable distances between the PBAD promoter and the gene. To illustrate the use of this approach, we describe the construction of a strain of Escherichia coli in which growth at low temperatures on solid media is dependent on threshold levels of arabinose. Other uses of the transposable promoter are also discussed.Abbreviations: ECL, enhanced chemiluminescence; PAGE, polyacrylamide gel electrophoresis; SDS, sodium dodecyl sulphate; Tn?PBAD, in vitro transposable element, containing the omega interposon, araC and the araPBAD promoter, flanked by 19 bp inverted repeats recognized by Tn5 transposas
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
A QUT experience in combining sustainability research with educational activities and professional practice
No full textThe paper discusses the development and delivery of a university subject on sustainable\ud
construction, using related research projects as case studies and learning materials. It exposed\ud
students from a variety of disciplines to real life scenarios, to group around project cases, and\ud
learn to work with one another in solving sustainable development problems. The problem\ud
based learning approach directly responds to the new trends of learning by practising which, in\ud
the area of sustainability education, is particularly appropriate because of the need for multidisciplinary\ud
approach to complex issues, and the impetus for research and development to\ud
provide timely input for education in this growing discipline with a relatively short history.\ud
Collaboration of students from cross-disciplines, the engagement of industry and practitioners,\ud
the concept of using project cases and student design competition, and the tangible improvement\ud
of students’ comprehension of the sustainability phenomenon as a whole, have been the\ud
highlights of this Australian experience
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
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