1,720,954 research outputs found
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
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
Engineering filamentous fungi to improve bio-reaction performance in fermentation systems: application to the production of food/technical enzymes : Genetic engineering of fungi for food industrial applications
No full textSolid-state fermentation (SSF) processes with the filamentous fungus Aspergillus sojae ATCC 20235 (A. sojae) are known to yield good levels of pectinolytic enzymes which are valuable biocatalysts in the food industry. However, in fungal-based SSF systems there is a poor availability of oxygen in inner regions of the fermented mass, leading to limited cell growth and protein production. Previous studies showed that the heterologous expression of the bacterial Vitreoscilla hemoglobin (VHb) –commonly referred to as the “vgb/VHb technology”- can favor respiratory metabolism and cell growth of prokaryotes and eukaryotes under oxygen-limited conditions. The main purpose of this thesis was to genetically engineer A. sojae with VHb aiming to enhance its cell growth and protein production under conditions of SSF.
An Agrobacterium tumefaciens-mediated transformation procedure was established to successively integrate the VHb gene (vgb) into the genome of A. sojae. The transformed A. sojae strain harboring vgb (A. sojae vgb+) yielded more biomass and enzymatic units of exo-pectinases and protease in comparison to its parental strain (A. sojae wt) in solid-state cultures in Erlenmeyer flasks. Fermentations were up-scaled (100 times) in a drum-type reactor and the recombinant fungus produced up to 38% more pectinases and 33% more proteases in comparison to its wild-type. Furthermore, enzymatic extracts of A. sojae vgb+ clarified apple juice and blood orange juice with up to 37% and 50% more efficiency, respectively in comparison to the enzymatic extracts of A. sojae wt.
Overall, the results of this dissertation show that the vgb/VHb technology can improve cell growth and protein production of A. sojae in SSF and that the protein complex of the recombinant A. sojae vgb+ was substantially more efficient in the clarification of fruit-based beverages compared to A. sojae wt
Improved biomass and protein production in solid-state cultures of an Aspergillus sojae strain harboring the Vitreoscilla hemoglobin
Get PDFThe biotechnological value of Aspergillus sojae ATCC 20235 (A. sojae) for production of pectinases in solid-state fermentation (SSF) has been demonstrated recently. However, a common drawback of fungal solid-state cultures is the poor diffusion of oxygen into the fungi that limits its growth and biological productivity. The bacterial Vitreoscilla hemoglobin (VHb) has favored the metabolism and productivities of various bacterial and yeast strains besides alleviating hypoxic conditions of its native host, but the use of VHb in filamentous fungi still remains poor explored. Based on the known effects of VHb, this study assessed its applicability to improve A. sojae performance in SSF. The VHb gene (vgb) under control of the constitutive Aspergillus nidulants gpdA promoter was introduced into the genome of A. sojae by Agrobacterium-mediated transformation. Successful fungal transformants were identified by fluorescence microscopy and polymerase chain reaction (PCR) analyses. In solid-state cultures, the content of protease, exo-polygalacturonase (exo-PG), and exo-polymethylgalacturonase (exo-PMG) of the transformed fungus (A. sojae vgb+) improved were 26, 60, and 44 % higher, respectively, in comparison to its parental strain (A. sojae wt). Similarly, biomass content was also 1.3 times higher in the transformant strain. No significant difference was observed in endo-polygalacturonase (endo-PG) content between both fungal strains, suggesting dissimilar effects of VHb towards different enzymatic productions. Overall, our results show that biomass, protease, and exo-pectinase content of A. sojae in SSF can be improved by transformation with VHb.Fil: Mora Lugo, Rodrigo. Jacobs University; AlemaniaFil: Madrigal, Marvin. Jacobs University; Alemania. Universidad de Costa Rica; Costa RicaFil: Yelemane, Vikas. Jacobs University; AlemaniaFil: Fernandez Lahore, Hector. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Jacobs University; Alemani
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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