1,720,967 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
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
Construction, phenotypic and gene transcription analysis of an Aggregatibacter actinomycetemcomitans mutant strain in arc B.
No full textAggregatibacter actinomycetemcomitans produz fatores de virulência que induzem destruição periodontal, porém a sua regulação é pouco conhecida. O sistema de dois componentes ArcAB é um regulador da transcrição gênica que percebe concentrações de oxigênio no ambiente. Este estudo tem como objetivo construir uma amostra de A. actinomycetemcomitans arcB deficiente e comparar características fenotípicas e de transcrição gênica em relação à amostra selvagem. As curvas de crescimento em condições de microaerofilia e anaerobiose foram similares. Foram observadas diferenças nas capacidades de adesão e invasão às células epiteliais, de formação de biofilme, de adesão à hidroxiapatita recoberta por saliva e na hidrofobicidade entre as amostras. A análise de transcrição gênica por RT-PCR em tempo real mostrou expressão diferenciada de apaH, vppA, vapA e omp29. Os dados indicam que em A. actinomycetemcomitans, ArcB é capaz de detectar condições redox, sendo associado a expressão de fatores de colonização da cavidade oral, regulando a transcrição de genes associados à virulência.Aggregatibacter actinomycetemcomitans produces several virulence factors which induce periodontal destruction, but little is known about their regulation. The two components system ArcAB is a genetic transcription regulator that senses oxygen concentrations in the environment. This study aimed to construct an A. actinomycetemcomitans arcB deficient mutant and to compare phenotypic carachteristics and gene transcription with the wild type. The growth curves under microaerophilic and anaerobic conditions were similar. There were differences in abilities to adhere and invade epithelial cells, to form biofilm, to adhere to saliva-coated hydroxyapatite and in hydrophobicity between the strains. Gene transcription analysis by real time PCR showed differential expression of apaH, vppA, vapA and omp29. These data indicate that in A. actinomycetemcomitans, ArcB is able to detect redox conditions and is associated with colonization factors of the oral cavity, by regulating transcription of genes associated with virulence
Administração de uma ILPI durante a pandemia da COVID-19: relato de experiência profissional / Managing an LTIE during the pandemic of COVID-19: professional experience report
Full text linkA pandemia da COVID-19 tem impactado a humanidade em relação às questões de saúde, sociais e econômicas. Os idosos que vivem em Instituições de Longa Permanência para Idosos (ILPI) são considerados vulneráveis à contaminação e à infecção grave da doença. Relatar a experiência de administrar uma ILPI na pandemia da COVID-19. Relato de experiência profissional de um ano da pandemia numa ILPI particular da região metropolitana de São Paulo, Brasil. Mudanças em relação aos colaboradores, familiares e idosos foram implantadas e acompanhadas minuciosamente. A partir da declaração pandêmica da COVID-19 pela Organização Mundial da Saúde, foram divulgadas pelo Ministério da Saúde recomendações visando ao controle sanitário e epidemiológico em ILPI. Os gestores das ILPI devem buscar evidências científicas somadas às experiências profissionais para atuar de forma interdisciplinar na prestação de uma assistência emergencial humanitária, ética e segura aos idosos
VIABILIDADE DE LACTOBACILLUS CASEI EM ALIMENTO PROBIÓTICO INFANTIL RELACIONADA A VIDA-DE-PRATELEIRA
No full textNowadays the population is seeking, beside nutritional effects, food with beneficial effects on their health. The consumption of probiotic foods by children and adults has a role to establish a microbial activity which contributes to the healthy intestine. These foods have a lower shelf-life when compared to conventional products and often are consumed in expired date. This study aimed to examine, through microbiological culture, the viability of probiotic bacteria (Lactobacillus casei) in a food probiotic infant related to shelf-life indicated by the manufacturer. Cultures were performed on Rogosa agar, samples of food were plated by Pour plate ten days before the expired date, on the date and ten days after the date. Plates were incubated in the candle flame and it was performed the count of viable CFU. It was observed that the number of viable probiotic microorganisms decreased as progressed time of the shelf-life and ten days after the expired date, despite the characteristics of the products are unchanged, the amount of viable microorganisms not reached the minimum required by Legislation stating that the consumption of such products, out-dated, can cause intestinal discomfort and do not confer the expected benefits.Atualmente além dos efeitos nutricionais a população busca alimentos com efeitos benéficos a sua saúde. O consumo de alimentos probióticos por crianças e adultos tem como função o estabelecimento de uma microbiota que contribui para a atividade saudável do intestino. Estes alimentos possuem prazo de validade de vencimento menor que os produtos convencionais e muitas vezes, são consumidos com a data vencida. Assim, este trabalho teve como objetivo analisar, através de cultivo microbiológico, a viabilidade de bactérias probióticas (Lactobacillus casei) presentes em um alimento probiótico infantil relacionada a vida-deprateleira indicada pelo fabricante. As culturas foram realizadas em ágar Rogosa, as amostras do alimento foram semeadas por Pour plate dez dias antes da data de vencimento, na data e dez dias após a data. As placas foram incubadas em chama de vela e foi realizada a contagem de UFC viáveis. Foi possível observar diminuição do número de microrganismos probióticos viáveis conforme a progressão do tempo da vida-de-prateleira e dez dias após o vencimento, apesar das características organolépticas do produto encontrarem-se inalteradas, a quantidade de microrganismos viáveis não atingia o mínimo exigido pela Legislação vigente indicando que o consumo de tais produtos, fora do prazo de validade, além de poder trazer desconfortos intestinais, não confere os benefícios esperado
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
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