1,721,015 research outputs found
A 13 kg intra-abdominal mass: a case of mesenteric fibromatosis.
No full textMesenteric fibromatosis is a benign fibrous tumor, characterized by
proliferations of fibroblasts and myofibroblasts, locally aggressive but
non-metastasizing. It can occur rarely in association with familial adenomatous
polyposis or sporadically (related with previous trauma, abdominal surgery or
prolonged estrogens intake). Small bowel mesentery is the most common site of
origin of mesenteric fibromatosis. The authors report a case of a 47-years-old
male with a large mass involving the mesentery of the first jejunal loops. The
patient was symptomatic for nausea and referred an increasing abdominal
circumference; a CT scan showed a huge mass (34 × 29 × 15 cm) very close to the
superior mesenteric vessel roots. The surgical treatment consisted in the en bloc
removal of the mass weighting 13 kg
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
RXFP1 is expressed on the sperm acrosome, and relaxin stimulates the acrosomal reaction of human spermatozoa.
No full textThe function of relaxin in human reproductive processes remains poorly understood. Nevertheless, relaxin is produced by the prostate in men and by the corpora lutea of ovaries and endometrium in women. Previous studies with contrasting results have suggested a possible role of relaxin on sperm function and fertilization. Here we show the expression of the relaxin receptor RXFP1 on the acrosome of human spermatozoa. Furthermore, relaxin induced the acrosome reaction and, interestingly, the percentage of viable sperm with the acrosome reaction induced by relaxin was similar to that obtained with progesterone. These data suggest a physiological role on sperm for relaxin produced by the prostate and/or the female genital tract
Caution in the use of standard sperm-washing procedures for assisted reproduction in HPV-infected patients
No full textDispelling 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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