1,721,154 research outputs found
[Carta] 1912 dic. 18, Ciudad de México [para] Enrique Olavarría : [convocatoria]
No full textModesto M. Martínez y Mauricio Gómez convocan a Enrique de Olavarría a asistir a las sesiones extraordinarias del XXVI Congreso General; Documento escrito en papel membretado. Convocatoria a inicio de sesiones del Congreso
Isolation, cultivation and characterization of new bifidobacterial species
No full textBifidobacteria are important probiotic bacteria and the number of identified species of the genus Bifidobacterium is greatly increased in recent years mainly due to the study on poor investigated animal gastrointestinal niches. Thanks to the modern omics tools used for phylogenomic and genomic approaches, understanding host-bifidobacteria interactions (antibiotic resistance, adherence and biofilm formation as well as fitness, survival, and immunological functions) is becoming easier, allowing for more thorough molecular characterization. In this scenario on the other hand conventional microbial culture methods and identification processes for its accurate identification and characterization are not surpassed. Classical bacteriological studies targeted to one genus should be encouraged in order to accumulate isolates and their ecological, phenotypical and genotypical details: this is an important opportunity for useful, publishable, contributions to knowledge and to taxonomy and as support to molecular data and viceversa. For example, molecular data about the presence of bifidobacterial species in host microbiota where until now these species have not yet been isolated is a stimulus to unravel new findings. The addition of new species description should be considered not simply for academic validity, but also for their impact on applied microbiology especially for those species considered probiotics. The finding of recently new 23 bifidobacterial species in non-human primates, the most evolutionary closed species to humans, could be of great interest to obtain useful information also for human beings. Proposals for new species should include a suggested scheme for routine identification, and some reasonable basis for prediction of ecological, functional and technological properties as described in the Minimal Standards for new species description of Bifidobacterium, Lactobacillus and related genera. These requirements would provide a practical basis for the work in the routine laboratory. Academic taxonomists play an important role supplying expertise for probiotic applications because taxonomy should be the “working technical language of microbiology”
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
Resistance to freezing and freeze-drying storage processes of probiotic bifidobacteria.
No full textThe resistance to freezing at –135 °C and freeze-drying of potentially probiotic
bifidobacteria strains isolated from human habitat and from commercial probiotic products
already present in the Italian market were tested. The analysis was conducted in two
different cryoprotectives, sucrose and skim milk. The strains of Bifidobacterium animalis, the only species found in the commercial probiotic product, were resistant to freezing and freeze-drying in both of the cryoprotectives used. Bifidobacteria from human habitat, B 1501 and B 632 Bifidobacterium breve strains and B 600/2, B 669/3 and B 2416 Bifidobacterium catenulatum strains, resulted as the most resistant strains in the storage processes in both cryoprotectives. These strains are potentially useful for industrial applications. In the strains tested the percentage of viable cells were higher after freezing than after freeze drying. The performance of the cryoprotectives analysed were strain-dependent
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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