1,720,965 research outputs found
Mesothelioma in cattle: two case reports
No full textIntroduction: Mesotheliomas are tumours of the mesothelial covering cells of the serous membranes and their supporting connective tissue of mesodermal origin. In domestic animals, little is known about the pathogenesis or the causative factors of malignant mesothelioma. In people, malignant pleural mesothelioma is associated with asbestos exposure. At present, the available data on the prevalence of mesothelioma in cattle are inconsistent. Aim: This manuscript describes two cases of malignant mesothelioma, one in a cow and one in a young calf. Materials and methods: A 4-year-old Friesian cow with diarrheal syndrome, marked abdominal distension and partial anorexia and a 37-day-old male mixed breed calf with a history of progressive swelling of the scrotum and abdominal distension were examined. Result and discussion: Physical examination enabled to include mesothelioma in the differential diagnosis. Ultrasonography and even more histopathology were decisive for the final diagnosis. The animals were euthanized due to poor prognosis. In both animals, necropsy showed abdominal sero-haemorragic effusion and the presence of firm nodules on the peritoneal surfaces, which extended to the thoracic cavity in the cow and to tunica vaginalis in the calf. Based on gross pathology and histopathologic findings, the adult cow was diagnosed with acquired malignant mesothelioma, while the calf was diagnosed with predominantly epithelioid congenital malignant mesothelioma. Conclusion: Interest in mesothelioma has increased since the association between exposure to asbestos fibres and mesotheliomas has been demonstrated in humans. The four-year-old cow object of this report was stabled in a farm with asbestos roofs. The same situation was not observed in the calf. In respect to the latter, the mesothelioma was considered to be congenital in origin. To the best of our knowledge, the calf presented in this report is the first case of bovine congenital mesothelioma involving tunica vaginalis
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Frequency of bovine congenital pseudomyotonia carriers in selected Italian Chianina sires
No full textBovine congenital pseudomyotonia (PMT) is a genetic disease in Chianina and other breeds of cattle that induces muscular stiffness. PMT in the Chianina breed is caused by a missense mutation in exon 6 of the ATP2A1 gene, which encodes the SERCA1 pump. In this study, the prevalence of PMT carriers and the frequency of the deleterious PMT allele in selected subpopulations of the Chianina breed were estimated. The prevalence of PMT carriers among ranked Chianina sires used for artificial insemination in the years 2007-2011 was 13.6%. The frequency of PMT carriers in young bull calves born in the period January 2007 to June 2011 selected for a performance testing programme was 13.4%. Selective breeding against this genetic defect is restricted to males only and therefore is predicted to require at least seven generations to eradicate PMT
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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