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Supplementation of an artificial medium for the parasitoid exorista larvarum (Diptera: Tachnidae) with hemolymph of Hermetia illucens (Diptera: Stratiomyidae) or Antheraea pernyi (Lepidoptera: Saturniidae)
No full textThe effect of supplementing hemolymph of the black soldier fly, Hermetia illucens ( L.), or the Chinese oak silkworm, Antheraea pernyi ( Gue ' rin- Me ' neville), to a basic insect- free artificial medium for the tachinid Exorista larvarum ( L.) was investigated. The supplementation ( 20% w/ w) was based on the assumption that insect additives may optimize the media for this parasitoid. Egg hatch, pupal and adult yields, and sex ratio did not differ among the enriched and basic media. Preimaginal development was faster on both hemolymph- enriched media than on the basic medium. Despite the shorter development on the medium supplemented with H. illucens hemolymph than on the basic medium, on the two media puparium weights were comparable. The female flies reared on the medium enriched with H. illucens hemolymph did not lay more eggs, but the latter yielded significantly more puparia compared with the control females. Conversely, the medium enriched with A. pernyi hemolymph yielded lower female puparium weights than the basic medium and produced only one ovipositing female out of the five obtained female adults. These results indicate that the in vitro development of E. larvarum improved when the basic artificial medium was enriched with H. illucens hemolymph, whereas the supplementation with A. pernyi hemolymph negatively affected the quality of the in vitro- reared females
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Ecology and biocontrol potential of the South African flower bugs Orius thripoborus and Orius naivashae
Get PDFBiological control of arthropod pests is gaining the interest of growers all over the world. Species of the genus Orius are important natural enemies of thrips and other harmful arthropods in a variety of agricultural and horticultural crops and have been widely used in biological control programmes in Europe, the Americas and Asia. In South Africa, thrips are key pests in major crops, with the sugarcane thrips, Fulmekiola serrata Kobus, as a model example. As thrips are notably difficult to control with pesticides, an effective indigenous natural enemy could provide local growers with an alternative management strategy against this pest. During surveys performed in and around South African sugarcane fields, the two little studied anthocorid predators, Orius thripoborus (Hesse) and Orius naivashae (Poppius), were selected as candidate biocontrol agents. In this dissertation, the autecology of these flower bugs was studied and their potential as biocontrol agents of thrips and other arthropod pests in South Africa was assessed based on field observations and laboratory tests.
Based on our study, O. thripoborus appeared to be, in many aspects, a more suitable biocontrol agent than O. naivashae for use against arthropod pests in South Africa. Due to its better nutritional plasticity, O. thripoborus is a more easy and cheaper to rear natural enemy with an overall better predator performance compared with O. naivashae. Based on these findings, a South African company has recently started up the mass production of O. thripoborus for commercial biological control purposes in South Africa. Further research is needed to optimise the augmentative application and conservation of O. thripoborus as a biocontrol agent of thrips in sugarcane and other major crops in South Africa
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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