1,720,972 research outputs found
Enhancing insecticide activity using a physical mixture with cyclodextrin: a witch’s cauldron or an opportunity?
No full textCyclodextrins have many advantages when used in the agricultural field as complexes with agrochemicals. However, they interact with molecules and biological systems at different levels and an enhancement of agrochemical effectiveness even as a physical mixture cannot be ruled out. This was verified for the first time by a simple experimental system with mealworm larvae (Tenebrio molitor L.) as the pest, the inhibitor of chitin synthesis diflubenzuron as the insecticide, and β-cyclodextrin as the adjuvant. Under laboratory conditions, mealworm mortality was recorded under the following three treatments: (i) neat diflubenzuron, (ii) diflubenzuron/β-cyclodextrin physical mixture, and (iii) commercial formulation Dimilin WP25. The physical mixture with β-cyclodextrin significantly increased the mortality by enhancing the effectiveness of diflubenzuron. A significant dose effect was also found. Considering the application protocol, this result may be more likely due to the bioavailability enhancement of diflubenzuron by β-cyclodextrin. On the basis of the current knowledge and available literature, we assume that these results could be explained by the interactions between CDs and biological membranes and the associated increase in their permeability. The use of β-cyclodextrin in physical mixtures with insecticides could be of interest in the development of more effective agrochemicals through simpler and less costly research processes
Individual Marking Technique for Green Lacewings (Neuroptera: Chrysopidae)
No full textWe present a new technique developed to uniquely mark individual adult green lacewings (Neuroptera Chrysopidae) with a durable, quick-drying ink applied by a very fine tipped pen. This marking method is particularly suitable for use in laboratory experiments. It is reliable, cheap, and easy to apply and to decode
Susceptibility of the honeybee (Apis mellifera L.) to entomopathogenic bacterial toxins used for the biological control
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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
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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