1,721,015 research outputs found
HARVESTING , HANDLING PRACTICES AND PROCESSING OF BLUEFIN TUNA CAPTURED IN THE TRAP FISHERY :
No full textEco-Friendly Extraction to Enhance Antioxidants and Nutritional Value in <i>Arthrospira platensis</i>
Full text linkThe cyanobacterium Arthrospira platensis (Spirulina) has a global annual production of approximately 18,000 tons. Spirulina has notable nutritional benefits and is a key component of dietary supplements. However, efficiently extracting its bioactive compounds poses challenges. This study aimed to develop an eco-innovative method to enhance Spirulina’s antioxidant and nutritional values. The extraction protocol included a maceration step in phosphate-buffered saline (PBS, pH 7.4) at 5 °C for 48 h, followed by ultrasound-assisted extraction (UAE) at 400 W and 30 kHz, with a frequency of 30 cycles per min (consisting of 1 s on/off cycles, for a total of 6 extraction cycles). The proposed methodology allowed for the quantitative recovery of high-value compounds from Spirulina raw material (control), with increased yields of total lipids (+20.29%), total fatty acids (+60.48%), allophycocyanin (Apc, +41.41%), phycoerythrin (Pe, +81.42%), carotenoids (+30.84%), and polyphenols (+65.99%), leading to a boost in antioxidant activity (+42.95%). Conversely, the recoveries of proteins (−16.65%), carbohydrates (−18.84%), and phycocyanin (Pc, −0.77%) were incomplete. This study suggests a green extraction approach using PBS coupled with UAE, with promising energy and cost savings and potential applications in the dietary supplement sector
Microbiological characterization of a rearing system for the common sea urchin Paracentrotus lividus: a support to technical production regulations redaction and system monitoring
Full text linkObjective: The overexploitation of the sea urchin Paracentrotus lividus stock, as a consequence of the growing market demand for roe, has boosted the research for echinoderm rearing. The chemical, physical, and microbiological characteristics of land-based facilities are crucial for sea urchins' health and human consumption of their products. In Italy, health-hygienic regulations for P. lividus rearing are still to be perfected by the authorities. In this context, we characterized the microbiological quality of a pilot land-based facility for sea urchin production at the University of Cagliari (Italy) to support the development of technical production regulations.Materials and Methods The accredited Hygiene Laboratory of Cagliari University collected and analyzed the samples in June 2023. Mesophilic bacteria, yeasts, and molds were searched for in air and on surfaces. Total coliforms and Escherichia coli, Enterococci, Pseudomonadaceae, Staphylococcus aureus, sulfite-reducing Clostridia, and Vibrio spp. were identified in water samples. We searched forVibrio spp. and Pseudomonas spp. in the gonads and coelomic fluid of sea urchins.Results Although air, surfaces, and water quality were satisfactory overall, some critical points should be monitored more strictly. Enterococci concentration was 250 CFU/100 mL in the water reserve, suggesting animal contamination (other than humans). Pseudomonas aeruginosa was the most resistant to filtration processes, with a residual concentration of 6 CFU/250 mL after the second filtration. No colonies of Vibrio spp. or Pseudomonas spp. were isolated in sea urchins' gonads or coelomic fluid.Conclusions Starting from the results, we provided targeted advice for developing technical production regulations, system monitoring, and facility routine maintenance in accordance with the 'best practice' approach. This analysis could be considered a first step toward the elaboration of common regulations about the minimal standards for the breeding environment of P. lividus by national and regional authorities
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
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
Timing and duration of fishing seasons for artisanal bluefin tuna traps at four sites in Italy, 1896-2010
No full textThis data set contains data for the start, end and duration of the fishing season for artisanal bluefin tuna fishing traps located at four sites in Italy during 1896-2010. The data have been recovered from historical records, reports and archives associated with the traps
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