1,720,987 research outputs found
Potential for the development of mycopesticide based on aerial conidia and submerged spores of Beauveria bassiana and Metarhizium anisopliae for control of stored-grain insect pests
No full textGoing 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
Potential for the development of mycopesticide based on aerial conidia and submerged spores of Beauveria bassiana and Metarhizium anisopliae for control of stored-grain insect pests
No full textSusceptibility of Sitophilus zeamais (Motsch.) (Coleoptera : Curculionidae) and Prostephanus truncatus (Horn) (Coleoptera : Bostrichidae) to entomopathogenic fungi from Ethiopia
No full textThe efficacy of 13 isolates of entomopathogenic fungi belonging to Beauveria, Metarhizium or Paecilomyces spp. was assessed against Sitophilus zeamais (Coleoptera: Curculionidae) and Prostephanus truncatus (Coleoptera: Bostrichidae) using a total immersion bioassay technique in the laboratory. Fungi were applied at concentrations of 1 x 10(7) and 1 x 10(8) conidia mL(-1) for P truncatus and S. zeamais, respectively. All isolates tested were virulent to P truncatus (98-100% mortality, and median survival time (MST) ranged from 2.85-4.05 days). Metarhizium anisophae and B. bassiana were also virulent to S. zeamais (92-100% mortality, MST ranged from 3.58-6.28 days). The isolate of Paecilomyces sp.. was found to be the least virulent against S. zeamais, causing only 26.32 +/- 4.29% mortality with MST of 10.38 +/- 0.29 days. P truncatus proved more susceptible to the entomopathogenic fungi tested than S. zeamais. One M. anisophae (PPRC-EE) and three B. bassiana isolates (PPRC-HH, PPRC-9609 and PPRC-9614) were selected for further study and dose-mortality relationships were assessed on S. zeamais. The tested concentrations: ranged from 1 x 10(4)-1 x 10(7) conidia mL(-1). M. anisopliae (PPRC-EE) showed the lowest LC50 (3.39 x 10(5) conidia mL(-1)) followed by B. bassiana PPRC-HH (2.04 x 10(6) conidia mL(-1)). PPRC-9609 and PPRC-9614, showed slight differences in LC50 but not at LC90. The results revealed the higher potency of M. anisophae as compared with the B. bassiana isolates tested. The study suggests that the use of entomopathogenic fungi may hold promise as an alternative method to control pests of stored products in Ethiopia
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Production and processing of Metarhizium anisopliae var. acridum submerged conidia for locust and grasshopper control
No full textCurrently, mycopesticide development for locust and grasshopper control depends on aerial conidia or submerged spores of entomopathogenic fungi. In Our Study, the production of submerged conidia of Metarhizium anisopliae var. acridum (IMI 330189) was investigated in a liquid medium containing 3% biomalt and 1% yeast extract (BH-medium). The effects of freeze and spray drying techniques Oil the quality of submerged conidia were determined. The influence of different additives on the viability of fresh Submerged conidia and their suitability for oil flowable concentrate formulation development was assessed. In a BH medium maintained at 180 rev min(-1), at 30 degreesC for 72 h, IMI 330189 produced a green pigmented biomass Of Submerged conidia whereas in Adamek medium it produced a yellowish biomass of submerged spores. The spore concentration was high in both media; however, the size of the spores produced in the BH medium was significantly lower than those produced in Adamek medium (P<0.001). Submerged conidia can be effectively dried using either freeze or spray drying techniques. The viability and speed of germination were significantly affected by the drying and pulverizing process (P<0.001). The initial viability was significantly higher for spray-dried Submerged conidia than for freeze-dried spores. pulverizing of freeze-dried Submerged conidia reduced the speed of germination and the viability by 63-95%. Dried Submerged conidia can be stored over 45 wk at low temperatures (<10degrees) Without suffering a significant loss in viability. Furthermore, we have identified carriers that Lire suitable for oil flowable concentrate formulation development
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