1,721,204 research outputs found
Biomarkers and OLGIM Stage for Prospective Preneoplastic Risk Stratification
Full text linkserum pepsinogen (PG) tests correlate with the occurrence of gastric atrophy and intestinal metaplasia. However, because of its low sensitivity, Huang et al report that in North America, where Helicobacter pylori prevalence is low (8%) and the use of proton pump inhibitors is frequent, the discrimination value for gastric preneoplastic lesions, atrophic gastritis, and intestinal metaplasia of gastropanel biomarkers is too low to obtain good results
Association Between B-Type Epstein-Barr-Virus and Hodgkins-Disease in Immunocompromised Patients
No full text
Hepatitis C virus infection, cryoglobulinaemia, and beyond
No full textHepatitis C virus (HCV) infection is the major cause of mixed cryoglobulinaemia (MC), an immune complex (IC)-mediated systemic vasculitis
mainly involving the small blood vessels. The precise mechanism of cryoprotein production is currently unknown. HCV virions and
non-enveloped core protein participate in the formation of cold-insoluble ICs. Cryoglobulinaemic patients represent a distinct HCV-infected
population, in that significant HCV enrichment of lymphoid cells is accompanied by evidence of productive virus infection and increased
frequency of B cells. Liver, the major target organ of HCV, is the site of accumulation of inflammatory infiltrates that shares many architectural
features with lymphoid tissue and reflects a distorted homeostatic balance between factors that enhance cellular recruitment, proliferation and
retention, and those that decrease cellularity (cell death and emigration). There is now overwhelming evidence of a direct contribution to
B-cell growth and survival through production of a variety of cytokines and chemokines. Liver tissue over-expression and abnormal circulating
levels of B-cell activating factor belonging to the TNF family can provide effective costimulatory mechanisms to sustain the B-cell clonal
expansion, which constitutes molecular stigmata of MC. Indolent lymphoproliferation might act as the starting point of chronic, multistage
lymphomagenesis. An innovative therapeutic strategy is directed to ‘eradication of the virus’ and deletion of B-cell clonalities
Proteomic Analyses Lead to a Better Understanding of Celiac Disease: Focus on Epitope Recognition and Autoantibodies
No full textProteomic technologies are being used with increasing frequency in the scientific community. In this review, we have highlighted their use in celiac disease (CD). The available techniques, which include two-dimensional (2D) gel electrophoresis, mass spectrometry, and antibody and tissue arrays, have been used to identify proteins or changes in protein expression specific to gut tissue from patients with CD. A number of studies have employed proteomic methodologies to determine the diagnostic biomarkers in body fluids or to examine changes in protein expression and posttranslational modifications during signaling. A fast technological development of these methods, along with the combination of classic techniques with proteomics, will lead to new discoveries, which will consent a better understanding of the pathogenesis of CD
Clonal CD27+ CD19+ B-cell expansion through inhibition of FCgIIR in HCV+ cryoglobulinemic patients
No full textGoing 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
- …
