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Caratteristiche chimico-fisiche, microbiologiche e organolettiche di ricotta ovina prodotta in Sardegna
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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
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
High-performance liquid chromatographic determination of dinitroaniline herbicides in soil and water
No full textA high-performance liquid chromatographic method for the simultaneous determination of the dinitroaniline herbicides dinitramine, ethalfluralin, trifluralin, pendimethalin and isopropalin in soil and surface water is reported. The soil was extracted with diethyl ether and analysed without any clean-up. The water was analysed after purification and concentration on a C18 cartridge. The average recoveries were in the range 89-104%. The detection limits for the five herbicides were 0.02 mg/kg in dry soil and 0.5 μg/l in surface water
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
Solid-phase extraction and high-performance liquid chromatographic determination of organic acids in honey
No full textA high-performance liquid chromatographic method is reported that allows the determination of organic acids in honey after sample purification by solid-phase extraction. The chromatographic separation was achieved with two Spherisorb ODS-1 S5 columns connected in series and sulphuric acid (pH 2.45) as the mobile phase. The average recoveries of the acids ranged from 89% to 104% and the detection limits from 0.002 to 3 ppm (w/w)
The transformation of organic acids in Vernaccia wine during flor formation
No full textThree strains of Saccharomyces cerevisiae were used to study the transformations of organic acids in the Vernaccia wine during flor formation. All strains exhibited similar behaviour, differing only in the activity rate. Lactic acid was completely degraded, while malic, α-ketoglutaric and fumaric acids were formed. An analysis of the chromatograms showed the presence of some quantitatively significant unidentified acids
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