1,720,968 research outputs found
Proposta di un protocollo pratico per la valutazione dell'indice di condizione nei mitili (M. galloprovincialis)
Full text linkThe indices for the yields evaluation, as well as condition index (CI), that relate the amount of the meat with shell weight are widely used both for scientific research both for shellfish farming management, representing the main tools for the evaluation of merchantable traits in bivalve mollusks. CI values changes are due to a variety of factors, including mainly food availability and physiological status but also animal health and water temperature and salinity. Different methods are used to calculate IC value. in the mussels. The present study is intended to present a simple protocol for the CI mussels (M. galloprovincialis) evaluation able to mediate scientific rigor needs with the management needs in order to adopt an uniform procedure
Effects of vacuum pack onn the shelf life of live mussels (Mytilus galloprovincialis)
No full textItaly is one of the main mussel producer Country in the EU, but
this production is not matched by development of processing
techniques able to maintain product quality and facilitate storage
and utilization along the supply chain. Changes in consumer’s
habits suggest the need for processed products with
longer shelf-life also for traditional seafood like mussels. This
research was aimed to compare the effect of under vacuum package
(SV) with traditional plastic net (RT) on live mussel shelflife.
The effect of the storage method was evaluated on chemical,
physical and microbiological parameters of M. galloprovincialis
kept at 3°C±0.5 for 16 days. Statistical analysis was used to compare
the collected data. In a first trial, groups of 15 mussels were
checked in duplicate in terms of mortality, intervalvar liquid
release, edible portion water holding capacity and microbiological
counts to evaluate the effect of the innovative and traditional
package at day 1, 3, 6, 9, 13 and 16. Vacuum storage resulted able
to extend live mussel shelf-life: mortality started earlier in RT
group (day 6 of storage) relatively to the SV group (day 9 of storage).
In a second trial, the effect of byssus removal was tested.
Four groups of 15 mussels were daily sampled for 13 days.
Mussels kept under vacuum with byssus (SVBS) exhibited lower
mortality compared to RT groups or under vacuum after byssus
removal (SVDB). Microbiological counts and pH values of the
edible parts, although modified during storage, did not reveal
significant differences between groups SVBS and SVDB. The
research shows the efficacy of vacuum packaging to extend live
mussel shelf-life in comparison with the traditional plastic net
while preventing product contamination and body fluids loss
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
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
Modificazioni indotte dalla venericoltura sulla struttura dei sedimenti e dei popolamenti macrozoobentonici della Laguna di Marano
No full textDispelling 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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