1,721,013 research outputs found
Optimal regularity and Fredholm properties of abstract parabolic operators in L^p spaces on the real line
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Personal determinants of pharmaceuticals products online
No full textOur study examines psychological and sociodemographic variables that might influence the intention to
purchase pharmaceuticals online. Online questionnaires examining variables in Ajzen’s (1991) Theory of
Planned Behavior, as well as personal variables such as stimulating risk taking and safety perception (i.e.,
perception of the behavior as safe for health), were used for the purpose of the study. Results of hierarchical
regressions and of structural equation modeling showed that attitude and subjective norm were the main determinants
of future purchase intention. A significant effect was found also for past behavior and for safety
perception. Safety perception, moreover, resulted the more important determinant of attitude and of
subjective norm, thus exerting a significant and great indirect impact on future purchase intention. Propensity
to risk and age showed a significant but moderate direct effect on attitude and subjective norm but only
a modest indirect effect on future purchase intention. Public stakeholders may capitalize on these results to
orient their communication campaigns. In particular, messages stressing the risk of health may lower the
positive attitude toward the purchase of medicines online, and then the intention to purchase those products
online
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
Toxins of Pseudomonas syringae pv. syringae affect H+-transport across the plasma membrane of maize
No full textBiological activities of pseudomycin A, a lipodepsinonapeptide from Pseudomonas syringae MSU 16H
No full textSimilarly to other Pseudomonas lipodepsinonapeptides, pseudomycin A inhibits proton extrusion from maize roots, promotes closure of stomata in Vicia faba, necrosis of tobacco leaves, haemolysis of human erythrocytes, affects H(+)-ATPase activity and proton translocation in plasma membrane vesicles, and stimulates succinate respiration in pea mitochondria. In general, the biological activities of pseudomycin A are lower than those of syringomycin-E, the prototype member of this family of bacterial metabolities. This difference might depend on the diverse number and distribution of charged residues in the peptide moiety of these compounds
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