1,720,972 research outputs found
Nomenclature for the applications of nuclear magnetic resonance to the study of enzymes
No full textAbstractNuclear magnetic resonance (NMR) spectroscopy is a powerful tool for a careful examination of enzyme structure, dynamics and function. In this paper a description of the basis of NMR and the most frequent methods used in the application of this technique to the study of enzymes will be discussed
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
Regulación de la expresión de la microcina E492 y su inmunidad
No full textLa microcina E492 es un antbiótico peptídico de 7,9 kDa producido por
Klebsiella pneumoniae RYC492. Esta microcina actúa mediante la
despolarización de la membrana citoplasmática de bacterias Gram negativas
como E. coli, Salmonella, Citrobacter, Enterobacter y Klebsiella, mediante la
formación de canales iónicos. Mediante estudios de clonamiento y expresión en
E. coli, se estableció que los determinantes genéticos, implicados en la
producción de microcina activa están contenidos en un segmento de DNA
cromosomal de Kebsielta pneumoniae RYC492 de 13 kb. Una característica
particular es que la microcina E492 activa se produce en fase exponencial de
crecimienio a diferencia del resto de las microcinas que se producen en fase
estacionaria. Además, la produccion de microcina activa es inhibida por la
presencia de enteroquelina producida por la falta de hierro en el medio'
Mediante el análisis de la secuencia de las posibles regiones promotoras de
los genes necesarios para la producción de microcina se estableció que varios
de ellos poseían la presencia de secuencias de consenso para la unión de Ia
proteína Fur, lo cual podría indicar que estos genes estarían regulados por
hierro.CONYCYT y en especial a la Fundación María Ghilardi Venegas
por las becas otorgadas para financiar mis estudios de Doctorado
tesis fue financiada por los proyectos FONDECYT 1991017, 1O20757 y
200001
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
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