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The role of environmental factors and medium composition on bacteriocin-like inhibitory substances (BLIS) production by Enterococcus mundtii strains.
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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
Raw milk traditional Italian ewe cheeses as a source of Lactobacillus casei strains with acid-bile resistance and antigenotoxic properties
No full textEffect of environmental and nutritional factors on the production of bacteriocin-like inhibitory substances (BLIS) by Enterococcus faecium strains
No full textFive bacteriocin-like inhibitory substances (BLIS)-producer Enterococcus faecium strains (WGW7.2, WGJ17.2,
WGJ21.2, WGJ28.1 and WGW33.2) were characterized for their antimicrobial compound production under several growth conditions, at different concentrations and with different sources of nutritional factors and in the presence of ethanol and NaCl.
The strains showed different behaviours. MRS and SDB were found to be the optimal media for BLIS expression.
A higher BLIS production was observed at 30° and 37°C and at a pH in the neutral range. Low or no BLIS activity was detected after growth in the absence of nitrogen sources, carbohydrates, MgSO4 and MnSO4. Ethanol did not generally play a negative role, while NaCl determined a consistent decrease in BLIS activity that was proportional to its concentration. Due to the absence
of plasmids, BLIS production by all strains was chromosomally encoded. This study is part of a more comprehensive study aimed at characterizing lactic acid bacteria (LAB) associated with the raw materials used to prepare sourdough
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
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