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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
DETERMINATION OF VOLATILE ORGANIC COMPOUNDS RESPONSIBLE FOR FLAVOUR IN COOKED RIVER BUFFALO MEAT
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Occurrence of β-casein fragments in cold-stored and curdled river buffalo (Bubalus bubalis L.) milk
No full textThe safeguard of river buffalo Mozzarella cheese, a
Protected Designation of Origin dairy product, has
prompted an analytical study to trace the milk and
curd used as raw material in cheesemaking. This is to
prevent the illegal use of milk or curd from different
geographical areas outside of those indicated in the official
production protocol. For this purpose, we studied
primary proteolysis occurring in fresh and frozen milk
and curd to identify a molecular marker that could indicate
the raw material used. Whole casein from frozen
river buffalo milk was separated using cation-exchange
chromatography and sodium dodecyl sulfate-PAGE,
and a protein component with an estimated molecular
weight of 15.3 kDa was detected. This protein component
was revealed in fresh river buffalo milk as a faint
electrophoresis band, which drastically increased in intensity
in refrigerated and frozen milk as well as in curd
and was found to be associated with β-CN through
hydrophobic interaction. By using matrix-assisted laser
desorption/ionization-time of flight peptide mass mapping,
this component was identified as the C-terminal
fragment f(69–209) of β-CN (expected molecular weight
of 15,748.8 Da). β-Casein f(69–209), originating from the
early hydrolysis of Lys68-Ser69 by plasmin, has no counterpart
in bovine milk. The increased rate of hydrolysis
by plasmin toward the cleavage site Lys68-Ser69 has to be
ascribed to the elevated proline content of the peptide
61–73. The favored production of β-CN f(69–209) has
also drawn attention to the complementary proteose
peptone β-CN f(1–68) that is presumed to play a physiological
role in inducing milk secretion similar to that of
β-CN f(1–29). The higher in vivo and in vitro production
rate, compared with γ1-CN formation, indicates
that β-CN f(69–209) and its complementary fragment
are candidate molecular markers to evaluate milk and
curd freshness. We used indirect ELISA analysis based
on the determination of remaining nonhydrolyzed β-CN
to perform a quantitative evaluation of proteolysis
Effect of the technological processing on residual enzymatic activity of cathepsins in typical Italian hams
No full textVariations 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
Primi risultati di uno studio elettroforetico per la caratterizzazione di cagliate di importazione
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