1,720,972 research outputs found
La scoperta dell’ara di Bubastis a Turris Libisonis
No full textIl contributo si propone di ricordare il ruolo che Ercole Contu ebbe nella scoperta e nella valorizzazione delle
antichità della Sardegna non solo preistoriche e protostoriche ma anche, come in questo caso, romane. Il
rinvenimento dell’ara di Bubastis, divinità di origine egizia, rappresenta infatti un momento fondamentale
per lo studio dei culti isiaci nell’isola. Rinvenuta nel 1967 nell’area delle Terme centrali dell’antica Turris
Libisonis, l’ara ha continuato nel tempo ad attrarre l’attenzione degli studiosi che a più riprese si sono cimentati nell’analisi dei vari aspetti storici, archeologici e religiosi che la riguardano. Anche pochi anni fa un
nuovo dettaglio rimasto ‘nascosto’ per quasi mezzo secolo è stato (ri)scoperto
Risk factors for erosive and non-erosive gastroesophageal reflux disease and Barrett's esophagus in Nothern Sardinia
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Glucose-6-phosphate dehydrogenase deficiency and risk of colorectal cancer in Northern Sardinia A retrospective observational study
No full textAbstract
Glucose-6-phosphate dehydrogenase (G6PD) deficiency has been associated with a lower cancer risk, possibly via a reduction of
mutagenic oxygen-free radicals and by reducing nicotinamide–adeninedinucleotide–phosphate for replicating cells. In Sardinia, the
enzyme defect is frequent as a consequence of selection by malaria in the past. This study investigated the relationship between
G6PD deficiency and colorectal cancer (CRC).
A retrospective case-control study of 3901 patients from Sardinia, who underwent a colonoscopy between 2006 and 2016, was
performed. G6PD phenotype was assessed for each subject. The proportion of pre and malignant colorectal lesions was compared
in cases (G6PD-deficient) and controls (G6PD-normal). Data concerning age, sex, family history of CRC, smoking habits, body
height, and weight, and also associated diseases were collected.
The CRC risk reduction was 43.2% among G6PD-deficient compared with G6PD-normal subjects (odds ratio 0.57, 95%
confidence interval 0.37–0.87, P=0.010). Age, sex, family history of CRC, and also comorbidities such as type 1 diabetes and
ischemic heart disease, were significantly associated with CRC risk. The protective effect of G6PD deficiency remained significant
after adjusting for all covariates by logistic regression analysis, and was consistently lower across all age groups.
Glucose-6-phosphate dehydrogenase enzyme deficiency is associated with a reduced risk of CRC
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
I monumenti del progetto “Iloi”. Catalogo
No full textSi analizzano i caratteri architettonici di alcuni monumenti ubicati all'interno dell'area di interesse del "Progetto Iloi", che ha come centro il sito pluristratificato di Ilo
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
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