1,721,169 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
On the evolution of cancer genomes : Signatures of selection reveal cancer genes across multiple tumor types
No full textTumors are composed of fast-growing cells that become malignant under selection of biological functions needed for cancer development. In this thesis, I intend to uncover the basic evolutionary principles underlying cancer etiology. The first part constitutes a longitudinal analysis of a single CLL case, which tumor heterogeneity and clonal evolution were revealed by sequencing. The second explores the signatures of positive selection of somatic mutations allowing the identification of driver genes. The last part is an attempt to uncover the essential functions of the cancer cell using signals of purifying selection. Altogether, we have identified a landscape of cancer-related genes that can be used for improving current cancer treatments.El tumor esta compuesto de células que crecen indiscriminadamente, bajo la lupa de selección natural. En esta tesis hemos intentado reconstruir los principios básicos de la evolución del cáncer, como estos describen la adquisición de mutaciones que inician la malignidad tumoral. El primer trabajo es un anaálisis genómico de un paciente con leucemia. El Segundo explora la heterogeneidad intratumoral para identificar genes drivers del cáncer. Y el último trabajo se enfoca en desenmascarar las señales de selección negativa. Nuestros resultados de estos tres trabajos constituyen una fuente de nuevos genes que pueden ser explorados como dianas terapéuticas del cáncer.Programa de doctorat en Biomedicin
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
Computational analysis of epigenomic variability and its effect on regulatory activity
No full textEpigenetics provides a plausible link between the environment and changes in gene expression that might contribute to disease phenotypes. The main goal of the thesis is to study epigenomic variability and their effect on the regulatory activity underlying chromatin dynamics. With an ultimate aim to identify regulatory variants driving cancer as well as disease specific epigenomic patterns in neurological diseases, the thesis deals with the development and subsequent implementation of a novel supervised machine-learning based enhancer predictor (GEP). Further, to address the role of DNA methylation during development of two distinct larval morphs from a single egg in a parasitic polyembryonic wasp, we have developed a novel computational method (dMeth-X) that identifies putative differentially methylated genes responsible for morphological and behavioral differences between the larval forms. Additionally, the thesis focuses on the study of the effect of external factors on the epigenomic variability on the mouse brain cortex. Overall, we believe that my doctoral thesis is a successful endeavor to study the epigenetic variability and regulatory activity using next-generation sequencing approaches.La epigenética proporciona un enlace plausible entre el medio ambiente y los cambios en la expresión de genes que podrían contribuir a fenotipo de las enfermedades. El objetivo principal de la tesis es el estudio de la variabilidad epigenómica y su efecto sobre la actividad reguladora subyacente a la dinámica de la cromatina. Con un objetivo último de identificar variantes de regulación que contribuyen al cáncer, así como patrones epigenómicos específicos en enfermedades neurológicas, las tesis se enfoca en el desarrollo y posterior aplicación de un nuevo método supervisado para predecir potenciadores basado en aprendizaje automático (GEP). Además, para abordar el papel de la metilación del ADN en la configuración de dos formas larvarias distintas de un solo huevo en una avispa poliembriónica parasitaria, hemos desarrollado un nuevo método computacional (dMeth-X) para identificar los genes diferencialmente metilados que podrían contribuir distinguiendo formas larvarias contrastantes. Adicionalmente, la tesis incorporó el estudio del efecto de factores externos sobre la variabilidad epigenómica de la corteza del cerebro de ratón. En general, creemos que mi tesis doctoral es un esfuerzo exitoso para estudiar la variabilidad epigenética y la actividad reguladora utilizando enfoques de secuenciación de próxima generación.Programa de doctorat en Biomedicin
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
On the evolution of cancer genomes : Signatures of selection reveal cancer genes across multiple tumor types
Full text linkTumors are composed of fast-growing cells that become malignant under selection of biological functions needed for cancer development. In this thesis, I intend to uncover the basic evolutionary principles underlying cancer etiology. The first part constitutes a longitudinal analysis of a single CLL case, which tumor heterogeneity and clonal evolution were revealed by sequencing. The second explores the signatures of positive selection of somatic mutations allowing the identification of driver genes. The last part is an attempt to uncover the essential functions of the cancer cell using signals of purifying selection. Altogether, we have identified a landscape of cancer-related genes that can be used for improving current cancer treatments.El tumor esta compuesto de células que crecen indiscriminadamente, bajo la lupa de selección natural. En esta tesis hemos intentado reconstruir los principios básicos de la evolución del cáncer, como estos describen la adquisición de mutaciones que inician la malignidad tumoral. El primer trabajo es un anaálisis genómico de un paciente con leucemia. El Segundo explora la heterogeneidad intratumoral para identificar genes drivers del cáncer. Y el último trabajo se enfoca en desenmascarar las señales de selección negativa. Nuestros resultados de estos tres trabajos constituyen una fuente de nuevos genes que pueden ser explorados como dianas terapéuticas del cáncer.Programa de doctorat en Biomedicin
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