1,721,048 research outputs found
Angioimmunoblastic lymphadenopathy (AILD). Histopathologic and immunohistochemical study in three cases
No full textIn three cases of angioimmunoblastic lymphadenopathy (AILD) immunohistochemistry was performed. The results were correlated with histopathology. Immunohistochemical studies seem to be of great utility in AILD for diagnostic purpose, for differential diagnosis, for the prognosis and, finally for the comprehension of some pathogenetic mechanisms
Site-specific monoclonal antibodies against peanut agglutinin (PNA) from Arachis hypogaea. Immunohistochemical study of tissue-cultured cells and of 27 cases of Hodgkin's disease
No full textThe purpose of this study was to increase the sensitivity of the staining reaction for the T antigen on the surface of neoplastic cells grown in vitro with the use of site-specific monoclonal antibodies (MAbs). The authors describe anti-peanut agglutinin (PNA) MAbs selected by screening the hybridomas with PNA and PNA bound to bovine serum albumin conjugated with the T antigen. The selected hybridomas (F2C8, F3D12, F3A5) were then grown in pristane-sensitized mice or in the Amicon Hollow Fiber System (F2C8). The affinity constant values for PNA were measured, and all the purified MAbs were tested on both native and denatured PNA, wheat germ agglutinin, concanavalin A, and ricin by using the immunoassay dot test and immunoblotting methods. Eleven different cell lines were stained with the three MAbs; similar results were obtained with F2C8 and F3D12. In each case the fluorescence, if present, was associated with the cell membrane, and the intensity of the staining was always stronger when the cells were incubated with the MAbs than when stained with fluorescein-labeled PNA. On the other hand, F3A5 failed to stain unfixed cells preincubated with PNA but stained the same cells after fixation, independently of the presence of PNA. One of the antibodies, F2C8, was used to stain histologic preparations from 27 cases of Hodgkin's disease and was compared with the anti-granulocyte antibody, Leu-M1, which has been used by numerous authors to identify the characteristic Reed-Sternberg cells. The results obtained were qualitatively similar; ie, F2C8 was at least as efficient as anti-Leu-M1 in its ability to stain the typical diagnostic cells in Hodgkin's disease
Microcystic adenoma of the pancreas (glycogen-rich cystadenoma) with stromal amyloid deposits
No full textWe report a case of a pancreatic glycogen-rich microcystic serous adenoma with stromal amyloid deposits, focusing on the significance of isolated amyloid deposits in tumours.
The architectural pattern was characterized by thin-walled cysts lined by a single layer of flat or cuboidal epithelial cells intensely stained by the PAS-reaction only before diastase digestion, suggesting the presence of glycogen. Tumour stroma was composed of broad fibrocollagenous tissue with lamellar hyalinized areas which were positively stained by Congo red and showed green birefringence and dichroism with polarized light. For amyloid protein characterization, immunohistochemical studies were performed with anti-beta amyloid protein and anti-amyloid precursor pre-A4695. The former antibody diffusely stained tumour stroma, while the latter stained only scattered stroma cells.
This is the first documented case of amyloid deposition in pancreatic serous adenoma. We indicate that the source of amyloid is an APP-like precursor secreted by stromal myofibroblasts
Cancro delle fosse nasali e dei seni paranasali e esposizione a polveri di legno: studio caso-controllo.
No full text
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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