1,720,983 research outputs found
Cytokinetic changes in two cases of plasma cell leukemia treated with a multipeptide derivative of m-{di(2-chloroethyl)amino}-L-phenylalanine (Peptichemio).
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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
Scanning electron microscopy of stellate cells of mammalian adrenal cortex as revealed by NaOH maceration
No full textAfter removal of connective tissues by the NaOH maceration method, adrenal gland
stellate cells of monkeys, rats and rabbits were studied by scanning electron
microscopy. The stellate cells were situated in the perivascular and interstitial
spaces and showed an ovoid cell body with numerous round or flat processes.
Through these processes they were in contact with other adjacent stellate cells
and thus formed a continuous cellular net around capillaries and parenchymal
cells. This net, which probably provides a cellular scaffolding for the gland,
may also play additional roles such as capillary contraction and nutrition for
adjacent parenchymal cell
Le cellule stellate nella corteccia della ghiandola surrenale: studio al microscopio elettronico a scansione (MES)
No full textSubcellular structure of the atrial myocardium of children in cases of atrial septal defect
No full textIn order to study the initial development of myocardial ultrastructural changes
owing to right atrium volume overload, myocytes have been studied in specimens
taken from the right atrial wall and auricle of four children aged 1 to 6 years
with ostium secundum atrial septal defect undergoing cardiac surgery. The younger
patients (1 to 4-year-old children) we observed did not show diffuse and
significant myocardial ultrastructural damages. The most significant myocardial
changes were observed in the 2 older patients (six years old) as we found
subcellular signs of myocardial hypertrophy such as an increased number of
mitochondria, increased glycogen inclusions, areas of new sarcomerogenesis and
nuclei lobulated and variably shaped. Focal degenerative changes, such as rupture
of mitochondrial cristae and intercellular fibrosis were also noted. These
changes may be considered as the initial features of myocardial hypertrophy
because they were not as severe and diffuse as those usually seen in a marked
functional failur
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