1,721,007 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
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
Transgenic Expression of Pectin Methylesterase Inhibitors in Arabidopsis and Tobacco limits Tobamovirus spreading
No full textViral infection is a complex process influenced by the balance of virus-encoded proteins and host factors which support virus replication, cell-to-cell and long distance movement through the plant. Virus-encoded movement proteins (MPs) are necessary to allow cell-to-cell spread through plasmodesmata (PD). The interaction of MP with plant pectin methylesterase (PME) is required for Tobacco mosaic virus (TMV) local spreading in tobacco.
The viral exit out of the vascular system is also partly PME-dependent. Pectin demethylation directed by PME is likely to be a source of methanol that has been recently found to facilitate TMV spreading by triggering PD dilation. We here report that the expression of a PME inhibitor from Actinidia chinensis (AcPMEI) in Nicotiana tabacum decreases the overall PME activity and increases the level of pectin methylesterification of the wall without affecting plant morphology and development. After inoculation with TMV the transformed plants expressing AcPMEI exhibited a significant delay of viral spreading. A reduced susceptibility against Turnip vein clearing virus (TVCV) infection was also observed in Arabidopsis plants overexpressing the AtPMEI-2 inhibitor. Overall, our results indicate PMEIs as efficient tools to limit Tobamovirus infection
R. P. Matthiae Fabri e Societate Jesu Concionum sylva nova, seu Auctarium in dominicas et festa totius anni ...
No full textMode of access: Internet.Tit. en anteportada: "R. P. Matthiae Fabri e Societate Jesu auctarium operis tripartiti"Marca tip. en portada.Portada a dos tintas.Texto a dos columnas con apostillas marginales.Multiples errores tip. de sign.Sign.: [cruz]4, *2, A-Z4, 2A-2Z4, 3A-3Z4, 4A-4Z4, 5A-5V4, 5X2
PECTIN METHYLESTERASE INHIBITORS LIMIT TOBAMOVIRUS SPREADING IN TOBACCO AND ARABIDOPSIS
No full textPlant infection by a virus is a complex process influenced by virus-encoded factors and host components that support replication and movement. Critical factors for a successful infection are the movement proteins (MPs) that modify the size exclusion limit of plasmodesmata during the cell-to-cell movement. Pectin methylesterases (PMEs) was shown to interact in vitro with the MP of different viruses and this interaction was proposed to be necessary for Tobacco mosaic virus (TMV) spreading as well as for its systemic movement through the host vasculature. Here we report that the ectopic expression of a PME inhibitor from Actinidia chinensis in Nicotiana tabacum significantly delays the TMV cell-to-cell and systemic spreading. A reduced susceptibility against Turnip vein clearing virus was also observed in Arabidopsis plants overexpressing a PME inhibitor from Arabidopsis. Overall, our results strongly support the important roles of PMEs in viral movement and indicate PME inhibitors as a useful tool to limit virus infection
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
- …
