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Biogenic amines content in Tuscan traditional products of animal origin
No full textBiogenic amines can be naturally present in many foods and they can also be produced in high amounts by
the activity of amino acid decarboxylases of microorganisms. If ingested in significant amounts they may
produce direct or indirect effects on a consumerís health. In food microbiology, their large presence has been
associated to spoilage and fermentation processes. The aim of the present study was to assess the content of
biogenic amines (single and total value) in Tuscan traditional cheeses and sausages. Thirty samples of these
products were tested. Biogenic amines content was analyzed by a HPLC-UV method. Tyramine was, in all the
matrices, the amine most often detected and quantified, followed by putrescine and cadaverine. In conclusion,
except in dry sausages, the data obtained in the present study suggest these traditional foods have generally
low biogenic amines total content
Evolution of biogenic amine content during ripening time in two types of dry sausages: can grain matrix play a role?
No full textThe biogenic amine (BA) content of two typical Italian sausages (salame Toscano and salame Garfagnino),
differing only in the degree of refinement of the fat matrix, was tested at different time points throughout the
ripening process (45 days length in total). The analyses were performed by an earlier validated HPLC method.
The total BA content in salame Toscano was significantly lower compared to that in Garfagnino salami.
Tyramine, spermine and putrescine were the BA detected in greatest concentrations. Cadaverine, spermidine
and 2-phenylethylamine were detected in smaller amounts, whereas tryptamine and histamine were not
detected. In summary, BA levels for both sausage types at the end of the ripening period were low and level
variation could be accounted for by size differences in matrix particles
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
BIOGENIC AMINE CONTENT IN “PECORINO DEL PARCO DI MIGLIARINO - SAN ROSSORE”
No full textBiogenic amines (BAs) can be naturally present in several foods. They are mainly produced in large amounts by amino acid decarboxylases activity of bacteria. The BAs content has been associated to the quality of raw material and to fermentation or spoilage processes. The aim of the present study was to asses the content of BAs (single and total value) in the core and in the external part of a Tuscan traditional pecorino cheese. Sixteen “Pecorino del Parco di Migliarino-San Rossore” cheeses belonging to same batch were tested during ripening time, up to 5 months. BAs content was analyzed by an HPLC-UV method. The BAs content was significantly higher in the core than in the external part. Tyramine was the amine most frequently detected and largely quantized, followed by putrescine, histamine and cadaverine
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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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