1,720,962 research outputs found
Extreme left ventricular hypertrophy: an indicator of increased risk of sudden death in hypertrophic cardiomyopathy
No full textpubblicati su:
Cardiac Arrhythmyas 2003
Springer-Verlag 200
Respiration rate and oxy-regulatory capacity in cold stenothermal chironomids
No full textThe effects of temperature and oxygen saturation on the respiration rate of two cold stenothermal chironomids, Diamesa insignipes and Pseudodiamesa branickii were investigated. Fourth instar larvae were collected in winter in a glacio-rhithral stream (1300 m a.s.l., Alps, NE-Italy) and their respiration rate was measured with a Clark's electrode in the range 0–14 °C. The respiration rate was significantly higher in D. insignipes than in P. branickii at low temperatures (≤4 °C), higher in P. branickii between 8 and 12 °C and comparable at 14 °C. Higher values of R (regulation value), R25% (respiration rate at 25% oxygen saturation) and b1/b2 (slope ratio in piecewise linear regression), and lower values of Pc (critical pressure) and I (initial decrease) were recorded in P. branickii than in D. insignipes. These values are compatible with oxy-regulatory behaviour in P. branickii, whereas D. insignipes appeared to be almost an oxy-conformer. On the basis of this autoecological information, new implications regarding survival of species from cold, high altitude habitats under changing climatic conditions are made
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
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
Clinical populations of Pseudomonas aeruginosa isolated from acute infections show a wide virulence range partially correlated with population structure and virulence gene expression
No full textPseudomonas aeruginosa is a ubiquitous environmental bacterium responsible for a variety of infections in humans, as well as in animal hosts. While the evolution of virulence in P. aeruginosa strains isolated from chronic lung infection in cystic fibrosis (CF) patients has been extensively studied, the virulence phenotype of P. aeruginosa isolated from other infection types or from the environment is currently not well characterized. Here we report an extensive analysis of the virulence of P. aeruginosa strains isolated from acute infections compared with population structure. Virulence profiles of individual strains were also compared with the expression levels of the rhlR gene, the transcriptional regulator of the rhl quorum-sensing system, and the gene encoding Crc, a global regulator controlling catabolite repression and carbon metabolism. Additionally, the presence/absence of the two mutually exclusive genes, exoU and exoS, encoding effectors of the type III secretion system, was assessed. In order to capture the widest range of genetic variability, a collection of 120 clinical strains was initially characterized by repetitive element-based PCR genotyping, and a selection of 27 strains belonging to different clonal lineages was subsequently tested using three different virulence assays, including two Dictyostelium discoideum assays on different growth media, and a Caenorhabditis elegans fastkilling assay. We show that the parallel application of virulence assays can be used to quantitatively assess this complex, multifactorial phenotypic trait. We observed a wide spectrum of virulence phenotypes ranging from weakly to highly aggressive, indicating that clinical strains isolated from acute infections can present a reduced or altered virulence phenotype. Genotypic associations only partially correlated with virulence profiles and virulence gene expression, whereas the presence of either exoU or exoS was not significantly correlated with virulence. Interestingly, the expression of rhlR showed a significant and positive correlation with the virulence profiles obtained with the three assays, while the expression of crc was either negatively or not correlated with virulence, depending on the assay. © 2012 SGM
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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