1,720,966 research outputs found
Los niveles de ácido fólico en la población venezolana y su impacto en el área de salud pública
No full textLos folatos, constituyen cofactores fundamentales para los procesos bioquímicos que conducen a la sintesis y eventual modificación epigénetica de ácidos nucleicos e histonas. Además, su metabolismo está intimamente relacionado al metabolismo de la homocisteina. Se han descrito numerosas causas de mal funcionamiento del ciclo metabólico de folatos, la causa más frecuente y quizas la más relevante desde el punto de vista de salud pública es la deficiencia nutricional. El papel central del folato en la sintesis y posteriores modificaciones epigenéticas del material genético, por una parte, así como su relación con la homeostasis de la homocisteina, lo han asociado a dos tipos de patologías de gran importancia en salud pública: a) Enfermedades cardiovasculares y b) Defectos del desarrollo embrionario. En la actualidad, su papel en el riesgo cardiovascular es sujeto de controversia ya que estudios clínicos poblacionales no lo respaldan, sin embargo, si existe evidencia clara de su papel en la aparición de defectos del desarrollo embrionario, especificamente aquellos centrados en el tubo neural y el sistema cardio-circulatorio. Estas evidencias, llevaron a proponer diversos modelos programáticos en salud pública para prevenir y tratar a nivel poblacional el deficit nutricional de folatos. De los varios modelos ensayados, la fortificación obligatoria de ciertos alimentos de consumo masivo ha demostrado ser el mas exitoso y es actualmente implementado en 54 paises a nivel mundial. En Venezuela, desde la decada del 2000 se ha demostrado experimentalmente una seria deficiencia nutricional de folato, que afecta a más del 70% de la población femenina en edad fertil. A pesar de los múltiples llamados hechos a los responsables de las politicas de salud en el país, Venezuela sigue siendo uno de los pocos paises en la región que no ha implementado un programa de fortificación. Su implementación no requiere de una fuerte inversión oficial, pero si debe ser acompañado de un programa eficiente de seguimiento que permita a) evaluar los beneficios y b) las posibles modificaciones en su implementación.The folate cofactors are essential for the biochemical processes that lead to the eventual synthesis and epigenetic modification of histones and nucleic acids. In addition, their metabolism is closely related to homocysteine metabolism. While there have been described numerous causes malfunction folate metabolic cycle, the most common and perhaps the most important cause, from the point of view of public health, is nutritional deficiency. The central role of folate in the synthesis and subsequent epigenetic modifications of genetic material, on the one hand, and their relationship with the homeostasis of homocysteine, have been associated with two types of diseases of great public health importance: a) Cardiovascular Diseases b) Defects of embryonic development. Currently, its role in cardiovascular risk is the subject of controversy since this have not received support from population trials , however, there is clear evidence of their role in the onset of embryonic development defects, specifically those focused on the neural tube and the cardio-circulatory system. This evidence, led to propose different program models in public health, at the population level, to attack the nutritional deficit of folates. Of the several models tested, mandatory fortification of certain foods for mass consumption has proved the most successful and is currently implemented in 54 countries worldwide. In Venezuela, since the 2000s it has been shown, experimentally, a serious nutritional folate deficiency, which affects over 70% of the female population of childbearing age. Despite numerous appeals made to those responsible for health policies in the country, Venezuela remains one of the few countries in the region that has not implemented a program of fortification. Its implementation does not requires a strong government investment, but must also be accompanied by an effective monitoring program that allows a) evaluation of the potential benefits and b) support rational implementation of any necessary changes
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
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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