1,720,958 research outputs found
Freshness Indexes of Anchovies and Sardines of Mediterranean Sea
No full textAnchovy (Engraulis Encrasicholus) and sardine (Sardina Pilchardus) are blue fishes linked to our alimentary tradition of Mediterranean. In our work, particularly, we tested for the first time physical and enzymatic methods to verify the freshness of species of blue fish, anchovy and sardine of Mediterranean. In connection with to the lowering of the pH after post-mortem stage we assisted to a increase in proteolytic activity of calpaine and catpsine. Already after 2 h in post- mortem there was a considerable increase
DETERMINATION AND CHARACTERIZATION OF A LIPOXYGENASE FROM OPUNTIA FICUS INDICA (L.MILLER).
No full text
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
REMOVAL OF BITTER COMPOUNDS FROM CITRUS BYPRODUCTS
No full textBitter compounds such as limonoids, which consist of oxygenated triterpenoid compounds, are present in citrus fruits. Removal of limonoids from citrus fruits is of considerable importance for the citrus industry. Researchers have removed limonoids from citrus fruits and citrus byproducts using organic solvents. The objective of this study was to use a simpler method to remove limonoids from citrus byproducts
STRATEGIES FOR THE EXTENSION OF THE SHELF LIFE OF READY TO EAT PRICKLY PEAR FRUITS
No full textThe prickly pear fruit (Opuntia ficus indica L. Miller) belongs to the Cactaceae family.
The fruit is a berry, composed by an epicarp and the pulp, which represents the
edible portion. At maturation, the epicarp turns yellow, red or white, depending on
the cultivar. In Italy, the prickly pear is mainly cultivated in Sicily (90% of the national
production). The fruit is very sensitive to low storage temperatures (< 5°C) which cause
chilling injuries. The fruits can be successfully commercialized as a ready-to-eat product,
peeled and suitably packaged. The main limit to its production is the formation
of off-flavours due to different factors, such as the growth of microorganism and the
action of endogenous enzymes (lipid oxidation). In fact, the oxidoreductases are directly
responsible for the lipid oxidation, which has influence on the production of off-flavours,
on the structure and on the shelf-life of the fruit. The lipoxygenase (LOX) is a dioxygenase
which catalyzes the oxidation of polyunsaturated fatty acids to hydroperoxides.
The aim of this work was to compare different packaging technologies to extend the
shelf life of ready-to-eat prickly pear fruits. The LOX activity, microbial counts and gas
composition were evaluated for non-treated samples packed in ordinary atmosphere
and in two modified atmospheres having different O2 and CO2 composition (MA1 5%
O2, 2% CO2, 93%N2; MA2 2% O2, 5% CO2, 93% N2) and for samples treated either with
a blanching or with a blanching followed by a dipping in a citric acid solution. The
pretreatment conditions are essential for the LOX activity, in particular the blanching
reduced its activity by at least 30% especially in combination with fruit acidification and
limited the microbial proliferation. As a result of suitable pretreatment and packaging
operations the shelf life of ready-to-eat prickly pears can be successfully extended
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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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