1,721,007 research outputs found
“Volumi di luce” (Opera esposta nella mostra “l’Unità dell’arte, l’arte dell’Unità. Segni contemporanei del mutamento”. Complesso dei Dioscuri del Quirinale. Roma. 2/12 settembre 2011)
No full textAcquerello pubblicato in Folco G., Bergamini E., Cortese F. (a cura di), catalogo della mostra Arte contemporanea italiana. l’Unità dell’arte, l’arte dell’Unità. Segni contemporanei del mutamento -. sala Mostre del Complesso dei Dioscuri del Quirinale a Roma. 2 - 12 settembre Itala Arte Edizioni, Torino 2011
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
Firm adhesion of neutrophils to cerebral vascular endothelium "in vivo": a role for cys-leukotrienes.
No full textInteractions between neutrophils (PMNL) and endothelial cells (EC) are involved in pathological alterations of cerebral blood vessel functions, leading to circulatory disturbances such as stroke [1]. The adhesive process induces PMNL activation, coupled to local bioavailability of oxygen free radicals, proteases, cytokines and arachidonate metabolites of the 5- lipoxygenase pathway, such as leukotriene A4 and B4 (LTA4, LTB4). This contributes to alterations of vasomotor reactivity, occlusion of microvasculature and induction of vascular permeability. The ensuing PMNL emigration through the blood brain barrier represents a critical event in the initiation of cerebral inflammation. Therefore it is clear that the PMNL-EC interaction may be a target for therapeutic interventions. Significant reductions in volume of the lesions and improved physiological functions were found in rats subjected to transient MCA occlusion and treated with anti-ICAM antibody, as well as with selective PMNL depletion in a murine model of reperfused stroke
Inhibition of nitric oxide synthesis increases bronchoconstriction induced by a peptide activating the thrombin receptor PAR1 in guinea pigs
No full textInhibition of nitric oxide synthesis increases bronchoconstriction induced by a peptide activating the thrombin receptor PAR1 in guinea pigs
No full textSimultaneous investigation of the neuronal and vascular compartments in the guinea pig brain isolated in vitro.
Full text linkWe describe a new method for studying the interactions between vascular tone changes and neuronal activity in the arterially perfused isolated brain of the adult guinea pig maintained in vitro. Electrophysiological recordings were performed in the piriform and entorhinal cortices with the entire arterial bed preserved or after vascular restriction to the territories of median and posterior cerebral arteries of one hemisphere. The changes in vascular tone were measured by means of a pressure transducer. The arterial pressure was 53.77±12.74 mmHg in control conditions at 30°C. Intraluminal application of vasoactive drugs, such as the tromboxane A2 receptor agonist U46619 (0.1 μM) and 5-HT (3 μM), induced an increase in the resistance to perfusion pressure that was prevented by the selective antagonists. The preservation of the endothelial function was verified by inducing the release of endogenous endothelial relaxant factor after intraluminal application of 1 μM acetylcholine. The study of the reciprocal interactions between neuronal activity and vascular tone modifications demonstrated that evoked responses in the piriform and entorhinal cortices were not modulated by rapid changes of the vascular tone. A sustained and elevated plateau of vasoconstriction maintained for several minutes determined a cortical spreading depression. Epileptiform discharges induced in limbic cortices by GABAa receptor blockade were consistently associated with a vasodilation (8.26±2.8 mmHg). The results demonstrate that the in vitro isolated guinea pig brain preparation can be exploited for studying simultaneously neuronal activity and cerebrovascular motilit
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
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