1,721,018 research outputs found
HYSTERECTOMY, OOPHORECTOMY, AND SUBSEQUENT OVARIAN-CANCER RISK
No full textObjective: To analyze the relation between hysterectomy with or without oophorectomy and the risk of subsequent ovarian cancer. Methods: We have conducted a case-control study since 1983 in a network of general and university hospitals in the greater Milan area. The cases were 953 women aged less than 75 years with histologically confirmed epithelial ovarian cancer. Women younger than 75 years residing in the same geographic area and admitted for acute conditions to the same network of hospitals where the cases had been identified were eligible as controls. Potential controls were excluded if they had been admitted for gynecologic, hormonal, or neoplastic diseases or had previously undergone bilateral oophorectomy. A total of 2758 controls were interviewed. Results: Fifty-two cases (5.5%) and 215 controls (7.8%) reported a history of hysterectomy, including eight cases and 38 controls who also reported unilateral oophorectomy. In comparison with women with intact uterus and ovaries, the age-adjusted relative risk (RR) was 0.7 in both women who reported hysterectomy alone (95% confidence interval [CI] 0.5-0.9) and in those reporting hysterectomy plus unilateral oophorectomy, though the latter finding was not statistically significant (95% CI 0.3-1.4). The risk of ovarian cancer was inversely related with time from hysterectomy. Compared with women reporting no pelvic surgery, the RR was 0.9 (95% CI 0.4-1.7), 0.7 (0.3-1.6), 0.7 (0.3-1.4), and 0.5 (0.3-0.8), respectively, in women reporting hysterectomy within 4 years or less and 5-9, 10-14, and 15 years or more before interview. Conclusion: Hysterectomy approximately halves the risk of ovarian cancer, possibly because of altered ovarian blood flow or the opportunity that hysterectomy provides for examining the ovaries
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
Cultivo de catfish sudamericano. Análisis económico para condiciones iniciales de producción
Full text linkLas tecnologías básicas de cultivo para producción del "catfish sudamericano" (Rhamdia sapo) están en vía de traspaso inicial a productores de la zona de Salto Grande, Entre Ríos. Un análisis económico previo para dos tipos de módulos (semiintensivo e intensivo) fue realizado en forma general para una operación comprendida entre 2,2 y 7,2 ton anuales, con resultados satisfactorios (Bertolotti y Luchini, 1988). Se consideró entonces un desove anual. La evaluación que se presenta acá incluye el análisis de costos de inversión y operación correspondientes a una producción que pueda iniciarse inmediatamente y contempla las restricciones actuales del programa en desarrollo, así como las derivadas de los propios productores noveles. Los cultivos a realizar son de carácter semiintensivo, realizados en estanques en tierra. Las metodologías utilizadas (Luchini, 1988) corresponden a las actualmente en prueba con las limitaciones existentes, especialmente en lo referido a sobrevide de las postlarvas. Los métodos de evaluación económica del programa incluyen: período de repago y tasa interna de retorno, según Levy (1978). La planificación para una producción inicial propone la utilización de desoves y postlarvas de 15 días de vida, obtenidas durante los meses de octubre a fines de diciembre. La cosecha de juveniles fue considerada sobre la base de un 5 a 10% de sobrevida, de lo inicialmente sembrado (densidad de 10/m2). Los cupos iniciales de venta de una producción total de 6 ton anuales ingresarían a mercado a partir del mes de abril para aquellos peces nacidos en octubre y noviembre; mientras que aquellos peces nacidos en diciembre recién irían a la venta a partir del mes de septiembre. El análisis económico indica alta rentabilidad, buenos recuperos y altas tasas de retorno.Fil: Bertolotti, María Isabel. Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP); Argentina.Fil: Luchini, L. Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP); Argentina
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
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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