1,720,955 research outputs found
Occurrence of fipronil in indoor house-dust in Italy
No full textThe wide use of Fipronil as insecticide, acaricide and product to control other arthropods in pets and households may determine its indoor presence and cause non-food exposure. The presence of total Fipronil (as sum of the parent drug plus its sulfone metabolite) was determined in samples of residential house-dust, in Italy, by LC-MS Orbitrap, with a reporting limit (RL) of 0.01 mg/kg dry weight. A number of 127 out of 164 samples felt above the RL, and total fipronil followed a skewed distribution, with P50, P75, mean, P90, P95 and maximum values falling at 0.05, 0.53, 2.93, 5.83, 18.2 and 74.1 mg/kg dust, respectively. Fipronil has been reported up to 14 mg/kg level in in indoor dust USA in 2009 (N = 24), whereas sparse of data are available in the EU. Within an “One Health” approach, such evidences highlight the need to consider indoor dust as an aggregated source of exposure in toddlers, due to their mouthing and licking behaviour and time spent in close contact with floor. Moreover, results indicate the persistence of veterinary biocide/drug residues in indoor as an emerging issue to be tackled also in term of the induction of drug resistance in target pests
Tissue distribution of ochratoxin A in pigs after administration of two-levels contaminated diets
No full textThe aim of the present study was to determine the levels of ochratoxin A (OTA) in pigs experimentally exposed to this mycotoxin and to evaluate if bile may be used to assess exposure to OTA. Twelve hybrid pigs were divided into 3 equal groups, a control group D0,and 2 experimental groups, D1fed with 50 Î1⁄4g OTA/kg diet, and D2fed with 500 Î1⁄4g OTA/kg diet for 15 days. At the end of the test, the animals were euthanized and samples of different tissues and biological fluids were analysed by HPLC-fluorescence detection for the presence of OTA. Samples of unconventional edible tissues such as lung and heart were also taken for analysis because they are used in typical Italian regional dishes. The Italian guidance value for OTA of 1 Î1⁄4g/kg established for pork meat and derived products has been exceeded in all the matrices from both the experimental groups. The comparison between OTA levels detected in D1and D2groups showed clearly a linear doseresponse relationship. Based on the mean values measured, OTA distribution follows the order blood plasma > lung > kidney (in D1group), heart (in D2group) > heart (in D1group), kidney (in D2group) > bile > liver > fat > muscle. Analysis of bile can be useful for the detection of OTA in pigs. However, since blood can easily be taken from pigs, and given the correlation between the mycotoxin concentration detected in this matrix and the concentrations detected in the others, OTA level in blood is a more viable approach to assessing the presence of OTA in edible tissues. As lung and heart may contain high concentrations of OTA, the analytical controls should also include these matrices
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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