1,720,966 research outputs found
Leaders' ‘Green’ Posts. The Environmental Issues Shared by Politicians on Facebook
No full textIs Facebook “green”? Do political leaders use this social medium to spread information on green policies? The aim of this paper is to investigate on whether and how Facebook is used by politicians as an arena to spread environmental policy proposals or simply information about the environment. The study covers 127 Facebook pages of political leaders in 31 different advanced industrial democracies. The 127 pages have been under observation for 26 months and 99,234 posts were scrutinized. 25,151 out of these 99,234 posts were manually coded and analyzed in order to measure how often contemporary leaders use Facebook to talk about environmental issues. We found that: (i) environmental issues do not represent a relevant concern for the main political leaders of contemporary advanced industrial democracies; (ii) left wing and younger leaders are the ones who used Facebook the most for spreading information about environmental issues; and (iii) relevant differences between leaders of countries with different levels of economic wealth and environmental pollution are noted in regard to Western countries
Comparing hybrid media systems in the digital age: A theoretical framework for analysis
No full textThe relationship between media and politics today is deeply entrenched in the wide use of information and communication technologies to the point that scholars speak about the emergence of hybrid media systems in which older and newer media logics combine. However, it is still unclear how the configuration of hybrid media systems changes across countries today, especially with regard to the interconnection between media and politics. In the article, we aim to develop a theoretical framework to capture such national differences. In so doing, we want to develop a heuristic device to understand whether the transformations brought about by information and communication technologies in the media and political realm also contribute to reshaping national media systems and to what extent. After outlining the main scope of the article in the ‘Introduction’ section, we discuss the theoretical framework that Hallin and Mancini developed to compare media systems across countries, and we present this framework’s main strengths and weaknesses when used as a tool for understanding the relationship between media and politics in the digital era. We then argue for the need for an updated and expanded version of such a theoretical framework: first, we update its four original dimensions (structure of media market, political parallelism, state intervention and journalistic professionalism) transversely including information and communication technologies–related indicators; second, we expand the original theoretical framework with one new dimension (grassroots participation) and the related indicators. In the ‘Conclusion’ section, we summarize our theoretical proposal and present some indicators and potential comparative data sources to assess similarities and differences of national media systems across countries. Finally, we also note two limitations of the article
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
Cardiac safety and anti-tumoral activity of a new nitric oxide derivative of pegylated epirubicin in mice
Full text linkThe use of epirubicin is limited by the risk of a dilatory congestive heart failure that develops as a consequence of induction of a mitochondrial-dependent cardiomyocyte apoptosis. In a previous in-vitro study, we have provided evidence that a new formulation of pegylated epirubicin- bearing moieties that release nitric oxide, named BP-747, exerted a potent antitumoral activity against a colon cancer cell line, which was completely devoid of cytotoxic activity against cardiomyocytes. The aim of this study was to investigate the antitumoral and cardiotoxic profile of BP-747 in Caco-2 and SKOV-2 tumor-bearing mice. Epirubicin-induced cardiomyopathy was detected by clinical (survival, weight loss), anatomical (heart weight loss) and biochemical evaluations (measurement of serum troponin and creatine phosphokinase levels). The antitumoral activity was investigated by the measurement of tumor diameters and weight. In comparison with free epirubicin and pegylated epirubicin, BP-747 showed more potent antineoplastic effects, as demonstrated by the 95% reduction of tumor volume. Moreover, while administration of epirubicin and pegylated epirubicin resulted in the development of a severe anthracycline cardiomyopathy, BP-747-treated mice were virtually devoid of clinical and biochemical signs of cardiotoxicity. The present data provide evidence that addition of a nitric oxide-releasing moiety to pegylated epirubicin confers a new and unique cytotoxic profile to the drug
Cardiac safety and antitumoral activity of a new nitric oxide derivative of pegylated epirubicin in mice.
No full textDispelling 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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