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A cautious view of the relationship between ambulatory blood pressure monitoring data and salt-sensitivity of blood pressure.
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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
Plasma fatty acids response to central volume expansion in salt-sensitive hypertension
No full textThe purpose of the present study was to invèstigate the possible regulation of plasma latty acids by an acuts isotonic-isooncotic central volume expansion. We méasured the levels of nonesterified fatty acids (NEFA) in plasrna from 12 essential hypertensive patlents subjected to water immersion (Wl). Central hypervolemia by Wl over 2 hours caused the levels of most NEFA to increase, concomitantly with a marked natriuretic and kaliuretic response. With respect to baseline values, serum insulin levels did not change during Wl, while there was a profound suppression of plasma renin activity (PRA) and plasma aldosterone, In addition, when individual NEFA percent increase was expressed as a function of salt-sensitivity index calculated as the change in mean arterial pressure IMAPI divided by the change in urinary sodium excretion rate), a grèater percent increase in stearic acid (r=.72, P<.009), palmitic acid{r=.83,P<.001),and palmitoleic acld (r=.58.P<.048) was found during Wl in those hypertensivè subjects showing higher saltsensitivity index. Thus, by demonstrating that an acute isolonic-isooncotlc volume expansion may induce a signiflcant increase of most NEFA plasma lèvels, we suggest that volume èxpansion per se could be included among ths well-recognized risk factors for cardiovascular morbid evènts
Blood pressure changes after high- and low-salt diets: are intermittent arm measures and beat-by-beat finger measures equivalent?
No full textThe fractal structure of cardiovascular beat-to-beat series described over a broad range of scales: Differences between blood pressure and heart rate, and the effect of gender
No full textThe fractal characteristics of heart rate variability are usually assessed by estimating short- and long-term scale coefficients, α1and α2, by detrended fluctuation analysis. Recently we extended this approach introducing a temporal spectrum of scale coefficients, α(τ), that describes the deviations of self-similarity from the bi-fractal model at each scale τ. Until now relatively short recordings were considered and α(τ) was characterized only for scales τ<100 s. Aim of this work is to describe α(τ) of cardiovascular signals extending the range τ by an order of magnitude with respect to previous studies
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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