1,721,221 research outputs found
Il Progetto Labtec/1: insegnamento scientifico - tecnologico integrato con le nuove tecnologie
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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
Synthesis, Pharmacological Evaluation and Selectivity Profile of Isomeric 2-Phenyl-2-cyclohexyl-4-[(dimethylamino)methyl]-1,3-dithiolane Methiodide as Potent Antimuscarinic Agents
No full textThe synthesis and antimuscarinic activity on M1, M 2 and M3 tissues of cis- and trans-2-phenyl-2-cyclohexyl-4-[(dimethylamino)-methyl]-1,3-dithiolane methiodides (1 and 2)are described. Our results show that compound 1 is a potent and Mr1 selective muscarinic antagonist
Non invasive micro-Raman spettroscopy for investigation of historical silver salt gelatin photographs
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Determination of Muscarinic Agonist Potencies at M1 and M2 Muscarinic Receptors in a Modified Pithed Rat
No full textThe agonistic potencies of (±)muscarine, (±)cis-2-methyl-5-[(dimethylamino)methyl]-1,3 -oxathiolane methiodide (cis-oxathiolane) and its two enantiomers were determined at muscarinic M1 and M2 receptors in the pithed rat. In non-pretreated animals, i.v. administration of these agents produced bradycardic effects mediated by cardiac M2 receptors followed by increases in heart rate mediated by M1 receptors in sympathetic ganglia. As these responses have been shown to partly overlap, "true" M1 and M2 potencies were determined after selective blockade of M1 and M2 receptors by pirenzepine and methoctramine, respectively. A similar rank order of agonist potencies was obtained at M1 and M2 receptors: (+)cis-oxathiolane > (±)cis-oxathiolane > (±)muscarine > (-)cis-oxathiolane. At both receptor subtypes, (+)cis-oxathiolane was considerably more potent (ca. 30-lold) than its corresponding (-) enantiomer indicating that the agonist binding sites of the two receptor subtypes may have similar stereochemical properties. While (±)muscarine showed similar potencies at M1 and M2 receptors, racemic cis-oxathiolane and its two enantiomers showed a slight selectivity (3 - 7 fold) for M1 receptors indicating the potential usefulness of these compounds in the development of selective M1 receptor agonists
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
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