1,720,999 research outputs found
Agua y Calidad de Vida en el Paredón del Dique San Roque: Construir alternativas con la comunidad para incidir en la mejora de las actuales condiciones de vida derivadas del uso de agua contaminada con algas toxicas
Full text linkFil: Lerda, Daniel Enrique. Universidad Católica de Córdoba. Facultad de Ciencias de la Salud; Argentin
Estudio citogenético y bioquímico en personas expuestas al plomo
Full text linkFil: Lerda, Daniel Enrique. Universidad Católica de Córdoba. Facultad de Ciencias Químicas; Argentin
Endocrine disruptors (ED) and human exposure
Full text linkIncreasing cases of malfunctions in the reproductive system, such as espermatic decrease in count and functionality, early puberty in boys and girls, increase of breast, prostate and testicle cancer and malformations associated with hormonal problems raise a sort of generalized concern. Simultaneously, cases of alterations in the reproductive function of an increasing amount of animal species can be observed. These are due to the exposure to persistent chemical substances such as pesticides, detergents, dioxins and furans. As a response, in the last decades an intense research activity has been promoted in order to describe these compounds according to their capacity to alter endocrine- reproductive system homeostasis, naming them endocrine disruptors. Among a recognized disruptor compounds, the following can be listed: phytoestrogens, organochlorinated pesticides, alkyl-phenol polyethoxylates, polychlorinated biphenyls, chlorophenols, phthalates, artificial estrogens, dioxins, furans and some aromatic polycyclic hidrocarbons, that is to say, compounds that can be found in everyday life. The concern lies in that they can be found in the environment at very low levels and have been proved to have harmful effects on fauna species as well as on laboratory animals at these low levels. The greatest difficulty to determine the effects on human beings is that they are exposed to several ED simultaneously. The main exposure risk lies on the early prenatal and postnatal development, when the organs and the nervous system are transforming and the increasing incidence of neurodegenerative deseases of unknown etiology could be explained by environmental factors of substances which can be promoters, such as some pesticides. This work tries developing better global data, especially in countries outside North America and Europe on status and trends of environmental contamination, exposure, and health outcomes.Fil: Lerda, Daniel Enrique. Universidad Católica de Córdoba. Facultad de Ciencias de la Salud; Argentin
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
Determinación electroquímica de plumbemia en niños residentes en la Ciudad de Córdoba, Argentina
No full textWith the purpose of evaluating the incidence of environmental factors in the intoxication for lead in the infantile population, blood samples from 92 children which attended the Hospital Municipal Infantil of the City of Córdoba were studied. The lead concentration in blood was determined by means of an electrochemical technique "Potentiometric Stripping Analysis with Constant Current dissolution" (PSACC), appropriate for the determination of trace amounts of metallic cations in complex matrixes. In this work it has been used a static mercury drop electrode, which has allowed us to obtain reproducible results using a reduced volume of sample, smaller than 500 μL. The electroanalytical results were compared with those obtained by flame atomic absorption spectroscopy. Six patients (6,5%) presented high lead levels, above the limit imposed by the Centre of Disease Control of the United States (CDC) (10 μgDL-1). This result indicates that a high percentage of children is incorporating lead from their environments.Fil: Wilke, Natalia. Laboratorio del Observatorio Ambiental Municipal; ArgentinaFil: Demarchi, María Virginia. Universidad Católica de Córdoba. Facultad de Ciencias Químicas; ArgentinaFil: Lerda, Daniel Enrique. Universidad Católica de Córdoba. Facultad de Ciencias Químicas; ArgentinaFil: Solís, Velía Matilde. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentin
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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