1,724,521 research outputs found
Separations—Scope Update
No full textThe journal Separations (ISSN: 2297-8739) was launched in 2014 [...
Gradual and Step-wise Halophilization Enables Escherichia coli ATCC 8739 to Adapt to 11% NaCl
No full textIntroduction: Escherichia coli (E. coli) is a non-halophilic microbe and is used to indicate faecal contamination. Salt (sodium chloride, NaCl) is a common food additive and is used in preservatives to counter microbial growth. Previous studies had shown that pathogenic E. coli has a higher salt tolerance than non-pathogenic E. coli. The effect of howE. coli interacts with the salt present in the human diet is under-studied. Thus, it is important to investigate this relationship.
Methods: In this study, we observed the genetic changes and growth kinetics of E. coli ATCC 8739 under 3% - 11% NaCl over 80 passages. Growth kinetics was estimated by generation time, cell density and minimum inhibitory concentration (MIC) of NaCl.
Results: Our results suggested that E. coli was able to adapt from 1% NaCl to 11% NaCl with an increment of 1% NaCl per month. Our MIC results suggested that E. coli was able to grow at NaCl concentration of more than 7.5% based on the Area under Curve (AUC) from 5% at passage 44 (cultured in 5% NaCl) to 13% at passage 72 (cultured at 7% NaCl).
Conclusion: We conclude that E. coli ATCC 8739 can be adapted to grow in 11% NaCl by incremental adaptation
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
Linked collectors and determiners for: Louisiana State University, Shirley C. Tucker Herbarium - Bryophytes.
No full textNatural history specimen data linked to collectors and determiners held within, "Louisiana State University, Shirley C. Tucker Herbarium - Bryophytes". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/f3af5cc9-4d39-4125-8739-2bbe5cf9d9cc">https://bionomia.net/dataset/f3af5cc9-4d39-4125-8739-2bbe5cf9d9cc</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/f3af5cc9-4d39-4125-8739-2bbe5cf9d9cc">https://gbif.org/dataset/f3af5cc9-4d39-4125-8739-2bbe5cf9d9cc</a>. Formatted as a Frictionless Data package
Distribution of sociodemographic characteristics between the internet addiction group and the noninternet addiction group (n = 8739).
No full textDistribution of sociodemographic characteristics between the internet addiction group and the noninternet addiction group (n = 8739).</p
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
IN-VITRO ACTIVITY AND KILLING EFFECT OF DX-8739, A NEW CARBAPENEM, COMPARED WITH THOSE OF MEROPENEM AND IMIPENEM AGAINST MULTIRESISTANT PSEUDOMONAS-AERUGINOSA
No full textDX-8739 is a new dehydropeptidase I-stable carbapenem. In order to evaluate its activity in comparison with those of meropenem and imipenem, 147 multiresistant Pseudomonas aeruginosa isolates acquired nosocomially were simultaneously exposed to the actions of the three carbapenems in vitro, whereas to compare their killing effects on 14 strains, 56 killing curve studies were performed. Overall DX-8739 was found to possess inhibitory activity as well as bactericidal activity statistically superior to those of meropenem and imipenem. At a concentration of 4 mu g/ml, 106 strains (72.1%) were found to be imipenem resistant; 33 and 27.4% of these strains were inhibited by DX-8739 and meropenem, respectively, a statistically significant difference (P < 0.05), DX-8739 was also shown to possess intrinsic activity in vitro superior to those of meropenem and imipenem against the imipenem-susceptible population of strains, However, no statistically significant difference regarding the comparative killing activities of the three studied carbapenems was observed. Following exposure to carbapenem for 24 h, 33.3, 44.4, and 70% of the strains which survived became resistant to DX-8739, meropenem, and imipenem, respectively, The reported results demonstrate the significant activity of DX-8739 against multiresistant P. aeruginosa strains acquired nosocomially, The mechanism of action of DX-8739 on P. aeruginosa. is unknown, and various hypotheses that might explain its in vitro superiority over meropenem and imipenem are proposed
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