1,721,056 research outputs found
ISOLATION AND CHARACTERIZATION OF PSEUDOMONAS-AERUGINOSA MUTANTS BLOCKED IN THE SYNTHESIS OF PYOVERDIN
No full textApprocci metodologici diversi nello studio dell'attività proliferativa nel carcinoma mammario.
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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
Pseudobactin biogenesis in the plant growth-promoting rhizobacterium Pseudomonas strain B10: identification and functional analysis of the L-ornithine N(5)-oxygenase (psbA) gene
No full textEffect of electric charged molecules on Sindbis virus hemagglutination and hemolysis.
No full textThe role of electrostatic interactions in the attachment and fusion at acidic pH of Sindbis virus (SNV) with goose erythrocytes was studied, investigating the effect of several anionic and cationic polyelectrolytes on SNV hemagglutination and hemolysis. In order to establish the target of active drugs, the compounds were incubated either with the virus particles or with the erythrocytes. Dextran sulfate was the only compound able to inhibit the attachment of SNV to the erythrocytes. Fusion of virus with red cells was reduced dose-dependently by the polyanions dextran sulfate, mucin and polygalacturonic acid. On the contrary two polycations, polylysine and polybrene, enhanced viral hemolytic activity. However the effect of polyions is not exclusively related to the electric charge since ineffective molecules were found in both classes of compounds
Characterization of rat brain cellular membrane components acting as receptors for vesicular stomatitis virus.
No full textThe chemical nature of the binding sites for vesicular stomatitis virus (VSV) was studied by measuring the ability of solubilized rat brain cell membranes (SRBM) to compete with cultured cells for viral binding. SRBM significantly reduced both binding and infectivity of VSV. After separation of protein and lipid components from membranes, VSV infection was unaffected by the protein fraction, whereas the lipid moiety, specifically phospholipids and glycolipids, showed a dose-dependent inhibitory effect. The essential role of phospholipid and sialic acid-containing glycolipid molecules as receptors for VSV was also suggested by the sensitivity of the inhibitory activity of SRBM and lipid components to phospholipase C and neuraminidase digestion
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