1,720,952 research outputs found
Treadmilling by FtsZ filaments drives peptidoglycan synthesis and bacterial cell division
Get PDFCoordinating cell wall synthesis and cell division
Most bacteria are protected by peptidoglycan cell walls, which must be remodeled to split the cell. Cell division requires the tubulin homolog FtsZ, a highly conserved cytoskeletal polymer that specifies the future site of division. Bisson-Filho
et al.
and Yang
et al.
found that the dynamic treadmilling of FtsZ filaments controls both the location and activity of the associated cell wall synthetic enzymes. This creates discrete sites of cell wall synthesis that circle around the division plane to divide the cell.
Science
, this issue p.
739
, p.
744
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Adelmo Genro Filho e a teoria do jornalismo no Brasil: uma análise crítica
Get PDFTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas, Programa de Pós-Graduação em Sociologia Política, Florianópolis, 2015.A afirmação de Adelmo Genro Filho, em "O Segredo da Pirâmide: para uma teoria marxista do jornalismo", de que o jornalismo é uma forma de conhecimento cristalizada no singular mobilizou jornalistas, pesquisadores e professores nos últimos 27 anos para instituição e legitimidade das teorias do jornalismo no Brasil. Com o arcabouço teórico e filosófico da Ontologia Crítica de Marx e Lukács, este estudo expõe as mediações presentes na produção e recepção da teoria, bem como os conceitos filosóficos que fundamentam a assertiva de Genro Filho. O trabalho divide-se em duas partes interdependentes. Na primeira, são trabalhadas as principais questões que se impunham para o jornalismo brasileiro nos anos 1980 (com ênfase para a formação acadêmica, a escrita jornalística e a hierarquia dos profissionais), a biografia do autor e o modo como o livro foi recepcionado pelos professores e pesquisadores em jornalismo no Brasil. A segunda parte reconstitui as bases filosóficas do livro, recuperando o entendimento ontológico do autor e o modo como esses fundamentos otimizam sua compreensão do jornalismo como forma de conhecimento. O objetivo é o de demonstrar como as escolhas teóricas do autor possuem estreita ligação com sua biografia e o modo como ele compreendia as questões de sua época. Ao passo que, por meio de análise do modo de recepção do livro, foi possível estabelecer uma cartografia da produção brasileira com base em 411 textos que citam "O Segredo da Pirâmide", evidenciando que o processo de institucionalização para a defesa do jornalismo como profissão, graduação especializada e com teorias específicas coincide com esse mapa. Paradoxalmente, demonstra-se que o processo de recepção do livro se faz acompanhar de uma negação da peculiar base marxista que o fundamenta, o que motiva o estudo detalhado das categorias utilizadas por Genro Filho.Abstract : In the book ?O Segredo da Pirâmide: para uma teoria marxista do jornalismo" [?The Secret of the Pyramid: for a Marxist theory of journalism"], Adelmo Genro Filho stated that journalism is a form of knowledge that is crystallized in the singular. This statement has mobilized journalists, researchers and professors over the last 27 years for the institution and legitimacy of theories of journalism in Brazil. With the theoretical and philosophical framework of Critical Ontology of Marx and Lukács, this study exposes the mediations present in the production and reception of the theory and the philosophical concepts that ground the Genro Filho's statement. The work is divided into two interdependent parts. At first, the text brings the main issues that were necessary to the Brazilian journalism in the 1980s (with emphasis on the academic, journalistic writing and the hierarchy of professionals), the author's biography and how the book was received by professors and researchers on journalism in Brazil. The second part reconstitutes the philosophical bases of the book, recovering the ontological understanding of the author towards journalism and how those fundamentals optimize the understanding of journalism as a form of knowledge proposed by the author. The objective was to demonstrate how the author's theoretical choices have close connection with his biography and how he understood the issues of his time. Simultaneously, through the analysis about the book's reception, it was possible to establish a cartography of the Brazilian production based on 411 texts mentioning "The Secret of the Pyramid", evidencing that the process of institutionalization for the defense of journalism as a profession, specialized graduation and with specific theories coincides with that map. Paradoxically, it is demonstrated that the book's reception process is accompanied by a denial of peculiar Marxist basis underlying it, which motivates the detailed study of the categories used by Genro Filho
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
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
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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