1,720,988 research outputs found
Regeneración de plantas de aguaí (Chrysophyllum gonocarpum, Sapotaceae) por cultivo in vitro de segmentos nodales
Full text linkFueron cultivados in vitro segmentos nodales de aguaí (Chrysophyllum gonocarpum) de: a) árboles adultos (5 y 15 años de edad); b) brotes epicórmicos de tallos leñosos de árboles de 15 años de edad obtenidos mediante brotación forzada en una cámara con alta humedad y c) plantas de 1 año de edad. En todos los explantes cultivados en medio MS - Murashige y Skoog (1962) - con 0,7% de agar, hubo regeneración de vástagos, pero únicamente enraizaron los de plantas jóvenes (1 año de edad); el mejor medio para el enraizamiento de vástagos fue MS diluido a ½ + IBA 1mg/L.Fil: Bertuzzi, S. M.. Universidad Nacional del Nordeste; ArgentinaFil: Mroginski, Luis Amado. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; 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
Vitamin E in viral inactivated vaccines
No full textThis research aimed at verifying whether vitamin E added to inactivated and emulsified vaccines enhances the immune response to viral antigens in chicken. Three hundred and twenty broilers (males and females) and 16 types of vaccines, varying in viral antigen [Newcastle disease virus, egg drop syndrome 1976 virus (EDS76V), and infectious bursal disease virus] and vitamin E amount (replacing 10, 20, and 30% of mineral oil) were used. Results show that vaccines with vitamin E, especially when it replaces 20 or 30% of mineral oil, induces a more rapid and higher antibody response than control vaccines. An adjuvant effect of vitamin E was also present in viral vaccine lacking bacterial antigens. Apart from vitamin E content, the Newcastle disease virus and infectious bursal disease virus monovalent vaccines induced higher titers of specific circulating antibodies in birds than did trivalent vaccines
Adjuvant properties of different forms of vitamin a in avian vaccines
No full textThe authors seek to verify previous data and to evaluate the effect of other forms of Vitamin A on chick immune response to viral and bacterial antigens. As in previous results, the data confirm that the influence on immune response of retinyl propionate vaccines is similar and retinyl acetate is less effective than normal vaccines. Moreover our results suggest that the adjuvant effect of Vitamin A, as retinyl palmitate in emulsified vaccines tends toward an increased humoral immune response with regard to NDV but not to Pateurella anatipestife
Immune response of chickens supplemented with vitamin E in diet and/or vaccine
No full textThe aim of this research was to verify if there is a synergic effect of vitam E supplid both in the diet and /or emulsified vaccine on immune response to viral and bacterial antigens. The results confirm the enhancing effect of vitamin E on the immune response to viral antigen when Vitamin E replaced light minereal oil in emulsified vaccines. On the other hand no synergic effect was observed when vitamin E was added both to vaccines and die
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
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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