1,721,003 research outputs found
Apparent nutrient digestibility of PAPs from poultry rendering and insect meals in rainbow trout (O. mykiss) and European seabass (D. labrax).
No full textThe use of preserved copepods in sea-bream small-scale culture: biometric, biochemical and molecular implications.
No full textRetention and excretion of microplastics by Yellow Mealworm (Tenebrio molitor) larvae reared on an amino formaldehyde polymer microbeads contaminated substrate
No full textYellow mealworm (Tenebrio molitor L., TM), one of the main cultured insect species, is used for feed and food. Larval stages of this species can be reared on several substrates, including grains and industrial by-products. However, this species may potentially accumulate contaminants from the substrate, including microplastics (MPs), which may represent a potential hazard for its utilization in food chain. Evidences for plastic degradation by mealworms have been reported, while there are few information about the retention of microplastics in the body and tissues of this species. The aim of the present study was to assess whether TM larvae reared on a MPs-contaminated substrate were able to retain MPs in body tissues and to evaluate the retention and excretion rate after fasting for 24 and 48 hours. For this purpose, fluorescent amino formaldehyde polymer microbeads (1-5 μm) were used to simulate a MPs contamination in the substrate used for larvae rearing. A relevant concentration of MPs were found in the gut and were associated with ingested feed. However, microscopic analyses indicated that the gut acts as a simple transit site and a barrier towards MPs migration in tissues. A marked reduction of MPS content was highlighted in larvae after fasting, even though a 48-hours fasting period was not sufficient to completely depurate insect gut from MPs. Results obtained in the present study suggest that the polymer microbeads used are recalcitrant to digestion by TM larvae, and show the relevant ability of depuration from MPs of this species. Taken together the results showed the suitability of TM to be reared on MPs contaminated substrates since larvae survival and growth resulted not hampered by the MPs presence and open cues on the fasting period able to completely depurate insect body from MPs residues
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
Il vocativo
No full textSi tratta del capitolo VII del volume, che si trova all'interno della Parte terza, dedicata alla deiss
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
Intestinal morpho-physiology and innate immune status of European sea bass (Dicentrarchus labrax) in response to diets including a blend of two marine microalgae, Tisochrysis lutea and Tetraselmis suecica
Full text linkThe aim of this study was to investigate the effects of replacing graded levels of dietary fish meal by a blend of two marine microalgae Tisochrysis lutea and Tetraselmis suecica on intestinal morpho-physiology and innate immune response in European sea bass. Two complete diets were formulated to be iso-nitrogenous and isolipidic and prepared by including a blend of the two microalgae, to replace approximately 15 and 45% fish meal protein of the control diet. A fourth diet, where the microalgae mix was substituted by soybean meal, was also prepared. Each diet was offered until visual satiety over 105 days to triplicated groups of European sea bass (204 ± 12.7 g), kept in a recirculating marine water system. The humoral and cellular innate immune parameters of E. sea bass were affected by the dietary treatment. Fish fed the microalgae-containing or the soybean rich diets, showed a significantly greater villi height, while the thickness of intestinal epithelium was significantly reduced in fish fed the soybean meal-rich diet. The activity of the brush border membrane enzymes, maltase, sucrase-isomaltase, γ-glutamil transferase and alkaline phosphatase was not affected by dietary treatment but changed in different intestinal tracts. The genes sucrase-isomaltase, peptide transporter 1, sodium/potassium-transporting ATPase and aminopeptidase N were overexpressed in the pyloric and proximal region of the intestine of fish fed the microalgae-including diets. In conclusion, a blend of dried marine microalgae Tisochrysis lutea and Tetraselmis suecica as alternative ingredients to dietary fish meal did not hamper gut digestive-absorptive functions of E. sea bass. Moreover, it resulted in enhanced non-specific immune response, suggesting an effective role as an immunostimulant ingredien
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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