1,720,974 research outputs found
Epidemiology of Avian Metapneumovirus Infection in Italy
No full textAt the beginning of 2000 little information was available on circulation and molecular epidemiology of AMPV Italian poultry except for the data regarding the first Italian isolates made in the late 80s, which were shown to be B subtypes (Juhasz and Easton, 1994; Sperati Ruffoni L., personal communication). Moreover even though the vaccination was widely applied, disease still occurs occasionally in young as well older turkeys. This paper reports some studies performed in Italy since 2001 in order to understand better the epidemiology of AMPV and prophylactic problems encountered in the field
Local deformations of branched projective structures: Schiffer variations and the Teichmüller map
No full textWe study a class of continuous deformations of branched complex projective structures on closed surfaces of genus g≥ 2 , which preserve the holonomy representation of the structure and the order of the branch points. In the case of non-elementary holonomy we show that when the underlying complex structure is infinitesimally preserved the branch points are necessarily arranged on a canonical divisor, and we establish a partial converse for hyperelliptic structures
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
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
Discriminazione rapida fra ceppi vaccinali e di campo di Metapneumovirus aviare mediante tecnica RFLP
No full textIn Italia l’infezione da Metapneumovirus aviare (AMPV) si è diffusa a partire dal 1987. Successivamente si è endemizzata nelle Regioni a maggior vocazione avicola, con prevalenza del sottotipo B. Per il controllo delle infezioni da AMPV nell'allevamento del tacchino sono utilizzati vaccini vivi attenuati; fra quelli disponibili nel nostro Paese è diffuso l’utilizzo del sottotipo B, somministrato nei tacchini da carne, via spray, in incubatoio. E’ stato dimostrato che ceppi vaccinali possono essere evidenziati tramite RT-PCR fino alla quarta settimana di età, associati o meno a sintomatologia respiratoria. In presenza di forme cliniche risulta necessario poter discriminare tra ceppi di campo e di origine vaccinale.
L'analisi della sequenza del gene G di numerosi ceppi AMPV sottotipo B isolati in varie aree geografiche del mondo, ha rivelato la presenza, nella sola sequenza del vaccino B (ceppo VCO3) maggiormente utilizzato in Italia, di un sito di riconoscimento dall’enzima di restrizione Msel. Tale sito è localizzato nell'amplicone che si ottiene con il protocollo di RT nested-PCR messo a punto da Naylor et al., e comunemente impiegato in Europa per la diagnosi delle infezioni da AMPV e la distinzione fra sottotipi A e B.
Basandosi su queste evidenze, è stato messo a punto e testato su alcuni AMPV isolati in Italia un protocollo di PCR-Restriction Fragment Length Polymorphism (RFLP) in grado di discriminare fra ceppi sottotipo B di campo e vaccinali
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