1,721,007 research outputs found
Age-related changes of phase-space distribution of ambulatory blood pressure monitoring data in normo- and hypertensive patients
No full textAGE-RELATED CHANGES OF PHASE-SPACE DIS TRIBUTION OF AMBULATORY BLOOD PRESSURE MONITORING (ABPM) DATA IN NORMO- ANDHYPERTENSIVE PATIENTS.
G. Recordati, G. Ponticelli, Medicina Cardiovascolare, Universita' degli Studi ed Ospedale Maggiore (Milano, Italy)
Objective: In addition to time domain, the ABPM data may be studied in the phase-space of R-R interval and blood pressurel.Methods: The individual phase-space distribution of data may be quantified by the negative slope of the regression line through 24 hour values of R-R interval over systolic (SBP) and diastolic blood pressures (DBP). Results: In 170 normotensive (N, SBP: 118.0 ± 8.0 24 mean ± sd, DBP: 72.7 ± 6.8 mmHg) and 181 untreated hypertensive subjects (H, SBP: 137.0 ± 8.0, DBP: 87.2 ± 6.8) the average slope of R-R interval over SBP was -5.7 ± 2.5 and -4.4 ± 2.4 ms*mmHg-1 respectively (p < 0.000). When distributed by decades of life the steepest slope occurred during the 20-29 decade (R-R/SBP, N: -7.7 ± 1.6; H: -6.3 ± 2.3) and the flattest in the 60-69 decade (R-R/SBP, N: -3.9 ± 2.0; H: -3.9 ± 1.4). The average slope was steeper from 20 to 59 years in normotensive than in hypertensive group and statistically significantly different at 40-49 (p<0.01) and 50-59 (p<0.05) years for R-R interval over both SBP and DBP. In the oldest subjects the regression slope was similar in both groups. The ambulatory arterial stiffness index (AASI) calculated on the same subjects from 20-29 to 60-69 decades increased linearly though similarly in both groups.Conclusions: When seen in the context of the "Autonomic space" by G.G. Berntson these data indicate that cardiovagal function is maximal at 20-29 years, declining thereafter and leveling off to the minimum of 60-69 decade. From 20 to 59 years of age the cardiovagal tone of hypertensive subjects seems to be constrained not only by an age effect but also by a sympathetic prevalence. References: 1) Recordati G. & Zanchetti A., Autonom. Neurosci: Basic & Clin.: 139, 68-77, 2008
Left ventricular deformations and torsion dynamics on pixel tracking : an early marker in systemic essential hypertension
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Indagine preliminare sulla qualità microbiologica delle insalate della quarta gamma
No full textLe insalate della "quarta gamma" si sono imposte negli ultimi anni sui mercati esteri e da qualche tempo anche in Italia. Si tratta di insalate che vengono commercializzate tagliate, lavate, asciugate, confezionate e pronte all'uso. Al fine di valutare la qualità microbiologica e la sicurezza d'uso di questi prodotti, sono stati analizzati campioni di insalate delle marche più commercializzate nella città di Milano e dintorni, sia alla produzione, sia alla scadenza, previa conservazione a +5°C. I risultati mostrano che sono elevati i valori della carica batterica standard, dei batteri Gram negativi totali, dei coliformi totali, mentre i batteri lattici, gli streptococchi fecali e gli eumiceti sono presenti in proporzioni meno significative. Nella maggioranza dei campioni non sono stati ritrovati batteri indici di sicura contaminazione fecale quali E. coli, nonostante i valori talvolta elevati di coliformi fecali e neppure batteri responsabili di tossinfezioni alimentari. Anche i batteri patogeni, in senso stretto, non sono mai stati ritrovati.The aim of this work is to study safety and microbiological quality of mixed salads ready to use. This kind of product became important in foregein markets in these last years; recently they start to be commercialized also in Italy. Several samples of different trade marks were bought in Milan and outskirt. The salads were analyzed, as soon as they were produced and at expiring day, after storage at 5°C. Total bacterial count, gram negative and total coliforms were generally well represented. Lactic acid bacteria, faecal streptococci, yeasts and moulds instead were less represented. In most of the samples no indicators of sure faecal pollution were found (i.e. E. coli), nor pathogens and toxins producers bacteria
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
Inhibitory activity of bivalent transition metal complexes with diamines toward a diamine oxidase
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