1,720,964 research outputs found
Multigenetic characterization of 'Candidatus Xenohaliotis californiensis'
No full textCicala, Francesco, Moore, James D., Cáceres-Martínez, Jorge, Del Río-Portilla, Miguel A., Hernández-Rodríguez, Mónica, Vásquez-Yeomans, Rebeca, Rocha-Olivares, Axayácatl (2017): Multigenetic characterization of 'Candidatus Xenohaliotis californiensis'. International Journal of Systematic and Evolutionary Microbiology 67 (1): 42-49, DOI: 10.1099/ijsem.0.001563, URL: http://dx.doi.org/10.1099/ijsem.0.00156
The Role of Diversity in Mediating Microbiota Structural and Functional Differences in Two Sympatric Species of Abalone Under Stressed Withering Syndrome Conditions
No full textWithering syndrome (WS) is a gastro-intestinal (GI) infectious disease likely affecting all abalone species worldwide. Structural and functional changes in abalone GI microbiotas under WS-stressed conditions remain poorly investigated. It is unclear if interspecific microbiota differences, such as the presence of certain microbes, their abundance, and functional capabilities, may be involved in the occurrence of this disease. Bacterial microbiotas of healthy Haliotis fulgens and Haliotis corrugata are mainly composed by Tenericutes, Proteobacteria, Fusobacteria, and Spirochaetes. We previously reported species-specific structural and functional profiles of those communities and suggested that they are of consequence to the different susceptibility of each species to WS. Here, we address this question by comparing the structure and function of healthy and dysbiotic microbiota through 454 pyrosequencing and PICRUSt 2, respectively. Our findings suggest that the extent to which WS-stressed conditions may explain structural and functional differences in GI microbiota is contingent on the microbiota diversity itself. Indeed, microbiota differences between stressed and healthy abalone were marginal in the more complex bacterial communities of H. corrugata, in which no significant structural or functional changes were detected. Conversely, significant structural changes were observed in the less complex bacterial microbiota of H. fulgens. Moreover, structural alterations led to a significant downregulation of some metabolic activities conducted by GI bacteria. Accordingly, results suggest that gastro-intestinal bacterial diversity appears to be related with both the health of abalone and the etiology of WS.EEA MendozaFil: Cicala, Francesco. CICESE. Department of Biological Oceanography; MéxicoFil: Cicala, Francesco. CICESE. Department of Biomedical Innovation; MéxicoFil: Cisterna-Céliz, José Alejandro. CICESE. Department of Biological Oceanography; MéxicoFil: Paolinelli, Marcos. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza; ArgentinaFil: Paolinelli, Marcos. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Moore, James D. University of California at Davis. Bodega Marine Laboratory; Estados UnidosFil: Sevigny, Joseph. University of New Hampshire. Hubbard Center for Genome Studies; Estados UnidosFil: Rocha-Olivares, Axayácatl. CICESE. Department of Biological Oceanography; Méxic
Fig. 1 in Multigenetic characterization of 'Candidatus Xenohaliotis californiensis'
No full textFig. 1. Bayesian phylogenetic tree obtained with the concatenated nucleotide sequences of 16S rRNA, 23S rRNA, ftsZ, virB11 and virD4 genes (3956 bp). Node labels show posterior probabilities (%); GenBank accession numbers are given in parentheses; scale bar represents 20% divergence.Published as part of Cicala, Francesco, Moore, James D., Cáceres-Martínez, Jorge, Del Río-Portilla, Miguel A., Hernández-Rodríguez, Mónica, Vásquez-Yeomans, Rebeca & Rocha-Olivares, Axayácatl, 2017, Multigenetic characterization of 'Candidatus Xenohaliotis californiensis', pp. 42-49 in International Journal of Systematic and Evolutionary Microbiology 67 (1) on page 46, DOI: 10.1099/ijsem.0.001563, http://zenodo.org/record/604837
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
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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