1,721,009 research outputs found
Angeborene zerviko-vaginale Atresie und Beckenendometriose Klinischer Fall und Literaturubersicht
No full textCongenital cervico-vaginal atresia is a rare malformation; the presence of a functioning endometrium combined with this anomaly causes a retrograde menstruation and then a greater likelihood of endometriosis. Up to the present literature relates only thirteen cases in which congenital cervico-vaginal atresia was combined with a functioning endometrium. Primary amenorrhea and cyclic, cramping lower abdominal pain was the common symptoms of all the patients. In this work we report a new case of such pathology in a 23 old woman affected also by harmonic nanism. After the review of the literature the embryologic mechanisms involved in lower Mullerian tract malformations, the surgical treatment and the mechanism of formation of endometriosis in association with an outflow tract obstruction are discussed
Fisiopatologia Generale Respiratoria
No full textLa Patologia e la Fisiopatologia Generale si occupano di studiare i meccanismi patogenetici che sono causa di malattie ed i meccanismi molecolari che sono alla base di ogni patologia d’organo e di ogni patologia sistemica. Trasmettere queste conoscenze è stato fin dalla prima edizione l’obiettivo del manuale di Patologia Generale e Fisiopatologia Generale, che viene ora proseguito dai Professori Mainiero,Misasi e Sorice della Scuola Romana di Patologia. Essi, pertanto, hanno elaborato la sesta edizione del manuale, ampliandolo con le nuove conoscenze in genetica, epigenetica, biologia cellulare e molecolare, fisiologia cellulare, immunologia e patologia molecolare e coinvolgendo numerosi ed autorevoli patologi italiani per trasmettere agli studenti i progressi della scienza in questo campo. (Testo fondato da G.M.Pontieri, I-II Edizione a cura di G.M.Pontieri, III-V Edizione a cura di G.M.Pontieri, M.A.Russo. L.Frati
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
Evidence for the existence of ganglioside molecules on Pneumocystis carinii from human lungs
No full textThis study was undertaken to assess whether glycolipid antigens (particularly gangliosides) are associated with Pneumocystis carinii obtained from human lungs. Gangliosides were extracted, purified in high performance thin-layer chromatography and stained with resorcinol. Two resorcinol-positive bands, co-migrating with GM1 and GD1a were demonstrated, suggesting the existence of ganglioside molecules on P. carinii. No resorcinol-positive bands were revealed in the pulmonary control tissue. In addition, an antiserum obtained from rabbits immunized with P. carinii antigen reacted with gangliosides GM1 and GD1a, as revealed by a dot immunobinding assay. This reactivity was inhibited by first incubating the antiserum with ganglioside micelles. Furthermore, anti-glycosphingolipid antibodies (aGM1) reacted with the bands of 200 and 55 kDa of P. carinii antigen. These results suggest that ganglioside antigens expressed on P. carinii can trigger specific immune responses
Advances in the Pathophysiology of Thrombosis in Antiphospholipid Syndrome. Molecular Mechanisms and Signaling through Lipid Rafts
Full text linkThe pathological features of antiphospholipid syndrome (APS) are related to the activity of circulating antiphospholipid antibodies (aPLs) associated with vascular thrombosis and obstetric complications. Indeed, aPLs are not only disease markers, but also play a determining pathogenetic role in APS and exert their effects through the activation of cells and coagulation factors and inflammatory mediators for the materialization of the thromboinflammatory pathogenetic mechanism. Cellular activation in APS necessarily involves the interaction of aPLs with target receptors on the cell membrane, capable of triggering the signal transduction pathway(s). This interaction occurs at specific microdomains of the cell plasma membrane called lipid rafts. In this review, we focus on the key role of lipid rafts as signaling platforms in the pathogenesis of APS, and propose this pathogenetic step as a strategic target of new therapies in order to improve classical anti-thrombotic approaches with "new " immunomodulatory drugs
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