1,720,968 research outputs found
Diffusione e trasferibilità delle poliresistenze in Salmonella spp nelle filiere suinicola e avicola
No full text
Investigation on the prevalence of BVDV-2 in dairy cattle herds of northern Italy [Indagine sulla prevalenza di infezione da bovine viral diarrhea virus tipo 2 (BVDV-2) in allevamenti bovini da latte del nord Italia]
No full textThe study was aimed at obtaining data regarding the prevalence of Bovine Viral Diarrhea Virus type 2 (BVDV-2) in dairy cattle population of the Po Valley, Northern Italy. The survey was carried out in the period 2009-2011 and involved five diagnostic laboratories located in five provinces of Lombardia and Emilia Romagna regions, namely Brescia, Cremona, Lodi, Mantova e Parma. The area is characterized for a high density of bovine dairy herds, even large herds rearing animals with high genetic value. Despite of the lack of official control-eradication programmes by Authorities, the consciousness about BVD damages is widespread among practitioners and dairy farmers. Therefore, voluntary control-eradication programmes to BVDV are set up on herd level. The programmes, besides the vaccination practice, provided for detection and cull of persistently infected (PI) animals. Bulk milk, blood samples, aborted foetuses and specimens from organs of cattle died for suspected BVD were examined by PCR or real-time PCR to detect BVDV-1 and 2. In addition blood serum samples from BVDV unvaccinated herds were submitted to comparative serology through serum neutralization test (SN) to both the viral types. On the whole 4,464 dairy herds were submitted to diagnostic investigation. Direct diagnostic tests (PCR or real-time PCR) allowed BVDV-2 to be detected in 2.9% of the examined herds. Indirect diagnostic test (comparative SN) showed 4% of the tested herds positive for BVDV-2 infection. Sometimes both the viral types were present together in a single herd. Taken together our data pointed out that BVDV-2, introduced in Italy in 1999 by a contaminated vaccine, at present circulates among the considered cattle population but the prevalence is low. So that BVDV-1 must be considered the most relevant viral type circulating among the domestic dairy cattle population. This evidence is consistent with the epidemiological situation of other European Countries but in contrast with the US picture where BVDV-2 infection is widespread in dairy and beef cattle. The reason of this epidemiological disagreement is not yet elucidated
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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