1,721,016 research outputs found
Qualità adesive di un self-etching primer. Studio in vivo
No full textLo scopo di questo lavoro condotto in vivo con l'ausilio della microscopia elettronica a scansione ed a trasmissione è valutare il tipo di interdiffusione resina/dentina prodotto da un sistema adesivo che pretratta il fondo cavitario con un self-etching primer. Con entrambe le metodiche d'indagine, si è osservato il progressivo instaurarsi di un'hybrid layer formato attraverso la successiva e complementare percolazione delle resine del primer e del liner del sistema vagliato. Il rinforzo resinoso continuo ed omogeneo, che dall'area d'interdiffusione si estende a tutte le componenti del tubulo dentinale, consente di rilevare capacità di sigillo cavitario che sembrano morfologicamente idonee ad opporsi all'attacco degli acidi orali
Morphologic study of the gastric mucosa during Helicobacter pylori infections.
No full textThe purpose of the present, study was to underline the importance of the use of SEM in the evaluation of Helicobacter pylori (HP) - Induced gastritis. Gastric biopsies from eleven patients affected by HP infections were examined using Light Microscope (LM), Transmission Electron Microscope (TEM) and Scanning Electron Microscope (SEM). SEM allowed for the localization of even small groups of bacteria and to demonstrate the many morphologic changes due to the infective phlogosis. The signs of cellular suffering and the relationship between bacteria and microvilli are of particular interest
Aspetti ultramicroscopici della parete delle cisti radicolari
No full textAl fine di valutare l'eventuale presenza d'irritanti microscopici, è stata condotta un'analisi morfologica al SEM ed al TEM delle componenti tissutali e cellulari costituenti la parete di 22 cisti radicolari.
In 8 dei campioni analizzati, la presenza di colonie microbiche proliferanti tra le giunzioni dell'epitelio interno ha dimostrato lo stimolo infiammatorio che sostiene la lesione endodontica nel tempo.
L'allontanamento della noxa patogena canalare determinerebbe la remissione delle reazioni di difesa immunitaria dell'ospite che rinforzano e sostengono la capsula fibrosa della cisti, consentendo una regressione del processo infiammatorio e l'ordinata riorganizzazione dei tessuti periradicolari
Modifications ultrastructurales des disques lombaires. Etude an microscopie electronique
No full textStudy Of The Influence Of Spray-Drying Parameters On The Preparation And Stability Of Eudragit®-Ketoprofen Microspheres
No full textFLO11 gene length and transcriptional level affect biofilm-forming ability of wild flor strains of Saccharomyces cerevisiae
No full textIn Saccharomyces cerevisiae, FLO11 encodes an adhesin that is associated with different phenotypes, such as adherence to solid surfaces, hydrophobicity, mat and air-liquid biofilm formation. In the present study, we analysed FLO11 allelic polymorphisms and FLO11-associated phenotypes of 20 flor strains. We identified 13 alleles of different lengths, varying from 3.0 to 6.1 kb, thus demonstrating that FLO11 is highly polymorphic. Two alleles of 3.1 and 5.0 kb were cloned into strain BY4742 to compare the FLO11-associated phenotypes in the same genetic background. We show that there is a significant correlation between biofilm-forming ability and FLO11 length both in different and in the same genetic backgrounds. Moreover, we propose a multiple regression model that allows prediction of air-liquid biofilm-forming ability on the basis of transcription levels and lengths of FLO11 alleles in a population of S. cerevisiae flor strains. Considering that transcriptional differences are only partially explained by the differences in the promoter sequences, our results are consistent with the hypothesis that FLO11 transcription levels are strongly influenced by genetic background and affect biofilm-forming ability
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
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