1,720,986 research outputs found
Epidemiologia molecolare e analisi genetica di ceppi di norovirus circolanti nell’area di Parma nel periodo gennaio 2007-aprile 2011.
No full text
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
Molecular detection and epidemiology of astrovirus, bocavirus and sapovirus in italian children admitted to hospital with acute gastroenteritis, 2008-2009
No full textAlthough a number of enteric viruses have
been identified in children with acute gastroenteritis,
the majority of cases of gastroenteritis
remain undiagnosed. In order to provide more
insights into the epidemiology of enteric viruses
that are not included usually in routine diagnostic
tests, cases of childhood sporadic
gastroenteritis of unknown etiology requiring
hospital admission in Parma, Italy, during
2008–2009, were screened for astrovirus (AstV),
sapovirus (SaV), and bocavirus (BoV). The
stools of 712 children, negative for rotavirus,
norovirus, adenovirus, enterovirus, and reovirus,
were examined by PCR or RT-PCR for AstV,
BoV, and SaV. The prevalence of AstV, BoV,
and SaV in the patients examined was 2.1%,
3.2%, 2.4%, respectively, with the viruses being
detected mostly in children <3 years of age.
AstV strains were characterized by sequencing
as types 1, 2, and 4, with a AstV-1 peak occurring
in the 2008 fall–winter season. BoV strains
were characterized as types 1, 2, and 3, with
BoV-3 circulating more frequently in the 2008
autumn and winter season and BoV-2 during
March–April 2009. The most common SaVs
were GI.2 and GII.1 while GIV and GV SaVs
were detected sporadically. Overall, AstV, BoV,
and SaV infections accounted for 7.7% of the
sporadic cases of acute gastroenteritis with unknown
etiology selected for the study. Different
virus types and lineages were found to circulate
and temporal peaks of virus activity were also
demonstrated, suggesting either small clusters
of infections or small outbreaks or epidemics in
local population
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
Caratterizzazione molecolare dei geni VP4 e VP7 di due rari rotavirus di genotipo G8P(14) e G10P(14) rivelati in bambini con gastroenterite.
No full textAppropriate 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
Infezioni da astrovirus, bocavirus e sapovirus in bambini ricoverati con enterite: analisi epidemiologica e molecolare.
No full textEpidemiologia molecolare e analisi genetica di ceppi di norovirus circolanti nell'area di Parma nel periodo gennaio 2007-giugno 2010.
No full textEpidemiological and molecular features of norovirus infections in Italian children affected with acute gastroenteritis.
No full textDuring a 5-year (2007-2011) surveillance period a total of 435 (15·34%) of 2834 stool specimens from children aged <14 years with acute gastroenteritis tested positive for norovirus and 217 strains were characterized upon partial sequence analysis of the polymerase gene as either genogroup (G)I or GII. Of the noroviruses, 99·2% were GII with the GII.P4 genotype being predominant (80%). GII.P4 variants (Yerseke 2006a, Den Haag 2006b, Apeldoorn 2008, New Orleans 2009) emerged sequentially during the study period. Sequence analysis of the capsid gene of 57 noroviruses revealed that 7·8% were recombinant (ORF1/ORF2) viruses including GII.P7_GII.6, GII.P16_GII.3, GII.P16_GII.13, GII.Pe_GII.2, and GII.Pe_GII.4, never identified before in Italy. GII.P1_GII.1, GII.P2_GII.1, GII.P3_GII.3 and GII.P6_GII.6 strains were also detected. Starting in 2011 a novel GII.4 norovirus with 3-4% nucleotide difference in the polymerase and capsid genes from variant GII.4 New Orleans 2009 was monitored in the local population. Since the epidemiology of norovirus changes rapidly, continuous surveillance is necessary to promptly identify the onset of novel types/variants
- …
