1,721,036 research outputs found
Infezione orale da Human papillomavirus: dalla verruca al carcinoma orale. Epidemiologia, clinica, prevenzione e terapia
No full textObjectives. The aim of this study is to examine the epidemiology and clinical manifestations of oral infections by Human papillomavirus (HPV), especially related to potentially malignant lesions. Materials and methods. A systematic review has been carried out with an aim to describe the state of the art about oropharyngeal HPV infection, its mode of transmission and the possible simultaneous infection in multiple anatomical sites. Moreover, the review focuses on prevention by vaccines and campaigns of sex education, as well as treatment protocols, whenever necessary. Results and conclusions. In recent years, medical literature has demonstrated a growing interest in HPV infections of the oral cavity and oropharynx, in view of scientific evidence suggesting a role of this viral family in the oropharyngeal district and in the uterine cervix carcinogenesis. Moreover, the media have increasingly addressed the issue and frequently spread alarm among dental patients. The dentist is therefore expected to have a thorough and updated knowledge relating to this infectious condition, which is one of the most common causes of sexually transmitted infections of the mucous membranes (genital, anal and oral). Whatever specialty area a dentist is pursuing, the knowledge of these concepts is a basic requirement for promoting the health of patients and for providing them with comprehensive information about this topic
Sebaceous carcinoma of the lip.
No full textSebaceous carcinoma (SC) is an uncommon neoplasm. To date fewer than 400 cases have been reported in literature. Due to the low incidence and the not universally accepted histopathological classification, it presents diagnostic problems1. Generally, the lesions arise in the meibomian glands of the eyelid. However, extra-ocular localisation in the head and neck region have been reported. While several reports have documented sebaceous adenomas arising from sebaceous glands of the oral cavity, oral sebaceous carcinomas are extremely rare. To date only six cases have been described2. The salivary glands too are considered an uncommon site, even if some cases arising in the parotid gland were recognised. Herein we reported a case of SC arising in the lateral edge of the lower lip in a 71-year-old men. To the best of our knowledge this is the second case described in lips. The clinical differential diagnosis included squamous cell carcinoma, basal cell carcinoma with sebaceous differentiation (BCCSD) and salivary gland neoplasms.
The operation was performed under local anaesthesia. The lesion was removed with 0.5 cm of free margins and a W shaped wedge. The defect was primarily closed. The post-operative course was uneventful. Although SC may be found among the multiple sebaceous neoplasms occurring in association with multiple visceral carcinomas in the Muir-Torre syndrome, in the present case the lip was the only localisation of SC. SC must be distinguished from basal cell carcinoma with sebaceous differentiation (BCCSD). The diagnosis may be facilitated by lipophylic stains on frozen sections or immunostains for EMA and S-100
Espressione di survivina e catenine nel carcinoma orale in relazione alla positività per HPV
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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
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