1,720,957 research outputs found
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
SVILUPPO DI UNA PCR MULTIPLEX PER L’IDENTIFICAZIONE E SIEROTIPIZZAZIONE DI L. MONOCYTOGENES ISOLATA IN CASEIFICI OVINI
No full textA new multiplex PCR for identification and serotyping of L. monocytogenes
(L.m.) was developed and tested on reference strains of L.m.(5), L. innocua, L. welshimeri, L.
seeligeri, and L. ivanovii. PCR primers were designed as previously described from iap gene
fragment for identification and variable regions of the L.m. genome for serotyping in order to
classify the strains into five groups [1/2a(3a), 1/2b, 1/2c(3c), 4b(d,e), and 4a/c]. The multiplex
PCR reproducibility was also tested on 28 strains isolated from sheep’s cheese-processing
plants. The results of the PCR multiplex agreed with those of the conventional identification and
serotyping agglutination methods. The strains isolated from sheep’s dairy plant belonged to 1/2a
(17), 4b (8), and 1/2b (3) serotypes
ANTIBIOTIC RESISTANCE IN STAPHYLOCOCCUS SPP STRAINS ISOLATED FROM GOATS’ SUBCLINICAL MASTITIS
No full textVariations 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
Listeria monocytogenes contamination sources in sheep cheese processing plants and strains virulence genes typing
No full textA survey on Listeria monocytogenes (Lm) contamination patterns was carried out in 10 sheep cheese processing plants, located in Sardinia (Italy). The samples were collected from the processing line during production. The samples were taken in cheese and ricotta processing area from food contact surfaces (raw milk filters, moulds, tables, ripening shelves and cheese and ricotta washing machine) and non food contact surfaces (floor drains or floors/walls). Pooled samples from rind surfaces of hard cheese and ripened ricotta were also taken.
Lm strains were isolated from 48 samples (18.8%) taken from 9 cheese factories (90%) and other Listeria spp strains were isolated from 39 samples (15.3%) from 10 cheese factories (100%). Lm was detected in raw milk filters (16.7%), cheese rinds (5.4%), ripened ricotta surfaces (18.2%), cheese moulds (20%), tables and shelves (9.8%), cheese washing machines (60%), ricotta washing machines (20%), drains or walls/floors surfaces (19.4%). Lm strains analysed for serotype with traditional and molecular method belonged to groups 1/2a (62,8%),
4/b (19,8%), 1/2b (14,0%) and 1/2c (3,5%). All Lm strains analysed for virulence genes prfa,
clp, inlA, inlB, inlC, hly, lisR, acta A , acta A
were found as positive
Enterotoxins and virulence genes detection in Staphylococcus aureus isolated from bulk tank goat milk
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
CARATTERIZZAZIONE DELLA PATOGENICITA’ IN MICRORGANISMI DEL GRUPPO BACILLUS CEREUS ISOLATI DA RICOTTA DI PECORA
No full textThe study of the toxin genes pattern was performed on 66 B. cereus group strains isolated from ricotta cheese samples collected in 11 industrial dairies. All strains were
identified by using Vitek system (bioMérieux, France). They were analysed by PCR for hbl and nhe operons genes, and cerA, cerB, ces, bceT and cytK. HBL and NHE production was also tested by using RPLA and ELISA kit. All hbl and nhe genes were found in 17 (25,8%) and 22 (33,3%) of isolates. PCR techniques showed the presence of cerA in 62 (93,9%), cerB in 32
(48,5%) and bceT in 58 (87,9%) of the strains. The genes cytK and ces were found in 12
(18,2%) and 8 (12,1%) strains. HBL and NHE production was also detected in 30 (45,5%) and 60 (91%) of the strains
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
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