1,720,979 research outputs found
Structural Arrangement of the Cardiac Collagen Fibers of Healthy and Diabetic Dogs
No full textThe heart is composed by a specialized muscle, whose form and function are
essentials for an adequate work and shows an amount of connective tissue which
support and provide insertion for this muscle, whose collagen fibers are
responsible for determination of tissue feature. Our objective was to identify
the structural arrangement of the heart collagen fibers in dogs. The hearts of
the dogs were submitted to the process of the controlled digestion with NaOH
solution and observed by scanning electron microscope. Our results showed that
the collagen fibers of the endomysial wall have structural arrangement composed
by an irregular network with one layer in normal dogs but in diabetic dogs the
network acquires a greater amount of the fibers and layers, looking like a "rug"
of fibers modifying the relationships of the stress/strain of the tissue. Ahead
of the observed results we are able to conclude that exist increase in the amount
and thickness of cardiac collagen fibers, beyond the increase of layers and
architectural disarrangement in the endomysial wall in the diabetic dog
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
Multidimensional Prognostic Index (MPI) in elderly patients with acute myocardial infarction
No full textBackground Management of elderly patients with acute myocardial infarction (AMI) is challenging due to lack of knowledge about the link between fragility, outcomes and interventional procedures. Aims The aim of this study was to establish the prognostic role of the Multidimensional Prognostic Index (MPI) in elderly with AMI. Methods A total of 241 patients >= 65 years old with AMI were continuously enrolled in this prospective study and divided into three groups according to the MPI score. The primary endpoint was 30-day mortality. Secondary endpoints were 6-month mortality and rate of adverse events. Results In-hospital overall mortality rate was higher in MPI-3 (p = 0.009). Patients of MPI-3 had a significantly higher mortality rate regarding the primary endpoint with 30-day survival of 78.9%, compared to 97.4% and 97.2%, in MPI-1, MPI-2 (p < 0.001), respectively. The survival rate progressively decreased in the three MPI classes of risk with a 6-month survival of 96.5%, 96.3%, 73.7% in groups MPI-1, MPI-2, and MPI-3 (p < 0.001). Longer length of in-hospital stay was observed in MPI-3 group. In-hospital complications were more frequent in higher MPI score. Discussion Our findings are in agreement with the results of other studies that evaluated the risk of in-hospital complications and mortality in older patients. In our "real-world" population of elderly hospitalized for AMI we observed poorer outcomes in patients belonged to higher MPI groups. Conclusions In the setting of AMI, MPI may be very useful in the daily clinical practice to manage older patients and predict the risk of in-hospital and follow-up complications
Local gentamicin-collagen sponge reduces cardiovascular implantable electronic device infections and pocket hematoma
No full textImplantation or replacement of a cardiovascular implantable electronic device (CIED) may be associated with complications, such as pocket hematomas and infections. This study aims to determine whether a lyophilized gentamycin-containing collagen implant (GCCI) reduces major CIED infections and pocket hematomas after implant
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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