1,720,999 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
Four cases of solitary fibrous tumour of the eye and orbit: one with sarcomatous transformation after radiotherapy and one in a 5-year-old child's eyelid.
No full textBACKGROUND:
Solitary fibrous tumour (SFT) is quite a rare neoplasm involving the eye and the orbit. It is described as showing benign behaviour in adults, but malignant cases are exceptionally reported in this location. This report describes four new cases of SFT/giant cell angiofibroma (GCA) of the eyelid and orbit, one in a 5-year-old child, and one with sarcomatous dedifferentiated transformation occurring 9 years after radiotherapy.
METHODS:
Four cases of ocular SFT/GCA were retrieved from the database of the Pathological Anatomy Unit, University of Padova; immunohistochemistry and RT-PCR were used to identify COL1A1-PDBGF fusion gene transcripts in all cases.
RESULTS:
In case 1, late relapse 9 years later was characterised by abrupt transition into a high-grade component, associated with a non-distinctive high-grade sarcomatous area. The latter component was CD34, CD99 and Bcl2 negative and smooth muscle actin positive. Molecular characterisation showed the absence of COL1A1-PDGFB fusion transcripts in cases 1, 3 and 4, excluded diagnosis of giant cell fibroblastoma in all cases. Analysis could not be performed in case 2.
CONCLUSIONS:
An eyelid SFT/GCA in a 5-year-old child is the youngest case reported in the literature, indicating that the tumour is not exclusive to adults. The case with sarcomatous transformation, with dedifferentiated features occurring 9 years after radiotherapy, raises some questions about the choice of treatment for ocular SFT, in which excision is sometimes difficult without devastating surgery
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
PRIME ESPERIENZE SULLE MODIFICAZIONI INDOTTE DAL TRATTAMENTO CON BISMUTO COLLOIDALE SUBCITRATO (BCS) NEI PAZIENTI CON CAMPYLOBACTER PYLORI (CP)
No full textMicrovascular free bone flap harvest with Piezosurgery©
No full textPiezosurgery device has proved to be a very effective and safe method of bone cutting. At present, its use is spreading in different surgical areas of maxillofacial surgery. This preliminary experience shows for the first time that segmentation of vascularized bone flaps with Piezosurgery is a valuable alternative to conventional cutting methods for the following reasons: 1) it improves the intraoperative safety of the procedure, ensuring an adequate periosteal blood flow to the
bone segments; 2) it does not increase the overall operative time; 3) it does not interfere with bone flap survival and bone healing
DNA content versus PSA and histologic grade in patients submitted to radical prostatectomy for prostate cancer.
No full textBevacizumab-related osteonecrosis of the mandible is a self-limiting disease process
No full textSummary
A female patient with non-small-cell lung cancer presented with a huge area of exposed bone in the mandible following spontaneous
teeth loss. She was receiving multimodal chemotherapy containing bevacizumab. No previous treatment with bisphosphonates or
comorbid conditions was reported. Pain medications and infection control were offered to the patient who was closely followed up. Initial
imaging and histology of bone and surrounding mucosa (8 weeks after bevacizumab cessation) confirmed the clinical suspicion of
avascular osteonecrosis of the mandible. Subsequent imaging and histology of bone and gingiva (12 weeks after bevacizumab cessation)
revealed the initial sequestration of the mandible with a marked expansion of the mucosal vascular network. Spontaneous bone
sequestration eventually occurred few months later, followed by stable and painless mucosal coverage of the mandibular bone. The patient
remained disease-free up to 3 years of follow-up
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