1,720,956 research outputs found
CONSERVATIVE SURGERY OF UVEAL MELANOMA - ECHOGRAPHIC MEANS IN THE PRE-SURGICAL AND POST-SURGICAL CONTROLS
No full textMEASUREMENT OF CORNEAL THICKNESS BY ULTRASOUND AFTER PHOTOREFRACTIVE KERATECTOMY IN HIGH MYOPIA
No full textBACKGROUND: Photorefractive keratectomy (PRK) has been used to treat myopia in human eyes since 1988.METHODS: We evaluated corneal ablation depth after excimer laser myopic photorefractive keratectomy with the Summit Technology Excimed UV200LA laser. Preoperative refraction was: mean 9.58 diopters (D) +/- 2.01, (range 6 to 17), We used ultrasound pachometry (1640 m/sec) in 40 eyes of 33 patients. Mean follow-up was of 49.5 weeks (range 16 to 76).RESULTS: The measurement of the corneal thickness showed a reduction of the initial thickness followed by an inconsistent increase caused by wound healing and tissue proliferation.CONCLUSION: The data showed no direct correlation between diopters of refractive correction and the change in corneal thickness
Basedowian ophthalmopathy: diagnostic criteria and new therapeutical prospectives
No full textBasedowian ophthalmopathy is an autoimmune disorder that occurs in 5% of patients affected by thyroid disease. These ocular and palpebral alterations cause severe aesthetic and functional damage. We studied five patients (age range: 54-65 years) who had undergone a new therapeutical protocol with immunoglobulin in high doses. The protocol foresaw the administration of intravenous Ig for two days every 21 days for seven courses. The drug used was human monomeric Ig, structurally unmodified. The control group consisted of 24 patients aged between 51 and 64 years treated with thyreostatics. The haematochemical requirements of the thyroid function, necessary to start the treatment, were the normalization of the following tests: TT3, TT4, FT3, FT4 and THS. If supported by other studies, on larger populations, treatment with intravenous Ig may be an important step forward in the cure of Basedowian ophthalmopathy, particularly as it does not cause the serious side effects that occur with steroid therapy. In fact, no relevant side effects were recorded in our study which included a follow-up of 2 years from the beginning of the treatment. However, because these therapeutical cycles are costly, we have not been able to treat a large number of patients (at present only patients with high ATA index have been given this treatment). Studies on larger populations may help to establish the most favourable time to begin therapy
Uveal melanoma conservative surgery: echography pre- and post-surgery
No full textThe aim of this study is to provide indications for conservative surgery of uveal melanoma. A-B scan ultrasonography provides accurate information not only on the site and the size of the melanoma and the involvement of neighbouring tissues, but also on the post-surgical evolution. Between January 1988 and December 1993 we used echography to study 31 patients who subsequently underwent localized surgical resection.The echographic diagnosis was confirmed in most cases during surgery, and the tumour tissular rating was confirmed in 93.5% of cases. Frequent echographic examinations during post-surgical follow-up showed hemovitreous, cataract, choroidal detachment, retinal detachment, bulbar phthisis and recurrences. Ultrasonography is the most effective diagnostic means both in the presurgical phase, as an aid in selecting therapy, and in the post-surgical phase where it alerts the physician to possible complications
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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