1,720,977 research outputs found
Esperienza preliminare nella caratterizzazione tissutale "in vitro" e "in vivo" con Risonanza Magnetica (RM) delle neoplasie del distretto maxillo-facciale
No full textVengono riferiti i risultati ottenuti su 10 pazienti portatori di neoplasie del distretto maxillo-facciale. Si tratta di carcinomi spinocellulari a vario grado di differenziazione. In tutti i pazienti sono stati eseguiti: studio con RM, esame istologico su prelievo biotpico, valutazione “in vitro” dei tempi di rilassamento del tessuto neoplastico con magnete di laboratorio.
L’indagine eseguita ha consentito di definire il comportamento RM del tessuto neoplastico spinocellulare e, quindi, di “ottimizzare” le sequenze impiegate per RM imaging ed ottenere un aumento nella risoluzione di contrasto tra tessuto neoplastico e tessuto sano.
Le misure del T1 e del T2 non consentono tuttavia allo stato attuale di caratterizzare il grading istopatologico a causa di differenze statisticamente non significative tra i campioni
Possibilità diagnostiche della Risonanza Magnetica (RM) nei tumori maligni del cavo orale e delle ghiandole annesse
No full textSono stati studiati con Tomografia a Risonanza Magnetica (RM) 28 pazienti affetti da neoplasie del cavo orale (16 casi) e delle ghiandole salivari maggiori (12 casi). Preliminarmente alla RM è stato eseguito in 12 casi studio ecografico (US) e in tutti i 28 pazienti Tomografia Computerizzata (TC).
La diagnosi RM è stata confrontata con l’esame istologico e con il riscontro chirurgico: La RM è risultata superiore alla TC in 3 casi di carcinoma spinocellulare e in 1 caso di cilindroma del cavo orale nel giudicare l’estensione del tumore. E’ risultata superiore agli US in 2 casi di neoplasie della parotide, mentre ha mostrato con maggiore evidenza rispetto alla TC l’estensione extraghiandolare profonda di tumori parotidei.
Gli AA concludono che la RM è estremamente utile in fase prechirurgica nell’integrare le informazioni della TC in caso di tumore avanzato del cavo orale, non consentendo tuttavia di caratterizzare la lesione (i vari istotipi mostrano non significative differenze di intensità di segnale) e di stabilirne il grading.
Nello studio delle lesioni focali delle ghiandole salivari, la RM può essere tecnica di secondo livello, preceduta sempre dagli US, per accertare l’eventualepresenza di lesioni multifocali della parotide ed eseguire lo staging
Risonanza Magnetica (RM) nella patologia neoplastica del distretto maxillo-facciale: monitoraggio dell'area tumorale pre e post trattamento chemioterapico
No full textSono stati sottoposti a studio RM pre e post-chemioterapico 10 pazienti affetti da carcinomi spinocellulari del distretto maxillo-facciale, a diversa sede di insorgenza e vario grading istopatologico, classificabili per estensione nei gruppi T3 (6 casi) e T4 (4 casi). In tutti i casi erano presenti adenopatie laterocervicali mono o bilaterali. L’estensione della neoplasia è stata sempre ben definita dalla RM che ha mostrato anche i rapporti tra area neoplastica e strutture anatomiche circostanti in modo dettagliato.
Nei controlli post-chemioterapia la RM ha consentito di valutare l’effetto riduttivo del trattamento sul tessuto neoplastico nella sua reale entità, individuando aree necrotiche e distinguendole dalle porzioni tumorali residue grazie alle differenti caratteristiche di segnale
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
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
Appropriate 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
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
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
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