1,720,959 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
Molecular Facet of Host-Pathogen Interactions in Fusarium Head Blight in Wheat ( \u3cem\u3eTriticum Aestivum\u3c/em\u3e L.)
Get PDFFusarium head blight (FHB) is a severe disease of wheat (Triticum aestivum L.). It not only reduces the quantity of the harvested grains but also decreases the grain quality due to mycotoxins contamination, especially Deoxynivalenol (DON). Qfhb1 (or simply called Fhb1) is the most important quantitative trait locus (QTL) for FHB resistance. Our lab has previously identified wheat gene WFhb1-1 (aka. Wfhb1_c1) as a candidate for FHB resistance gene. Here we report that WFhb1-1 has been cloned. The gene (GenBank # KU304333.1) consists of a single exon, encoding a putative membrane protein of 127 amino acids. WFhb1-1 protein produced in Pichia pastoris inhibits the growth of both F. graminearum and P. pastoris in culture. Western Blotting with anti- WFhb1-1 antibody revealed a significant decrease (p \u3c 0.01) in WFhb1-1 accumulation 12 hours post Fusarium inoculation in Qfhb1-non carrier wheat but not in Qfhb1-carrier wheat. Overexpressing WFhb1-1 in Qfhb1-non carrier wheat led to a significant decrease (p \u3c 0.01) in Fusarium-damaged rachis rate, Fusarium-diseased kernel rate and DON content in harvested kernels, while silencing WFhb1-1 in Qfhb1-carrier wheat resulted in a significant increase (p \u3c 0.01) in FHB severity. Therefore, WFhb1-1 is an important FHB resistance gene with a potential antifungal function and probably a key functional component of Qfhb1 in wheat. A model regarding how WFhb1-1 functions in FHB resistance/susceptibility is hypothesized and discussed. All the published reports on Fhb1 candidate genes has been also reviewed, discussed, and a multi-gene model of Qfhb1 associated regulation mechanism against FHB has been proposed. DON toxin production during the infection of F. graminearum in small grain crops is one of the most harmful virulence factors associated with economic losses. F. graminearum strain, Fg-4-2, having mycovirus FgV1-SD4 showed significantly reduced virulence against wheat compared to the wildtype not having the virus. Additionally, no DON accumulation was detected in the harvested wheat seeds infected by Fg-4-2, whereas ~18 ppm DON was detected in seeds infected by Fg-4-1, (F. graminearum not having FgV1-SD4). In this study, we propose a pathway of regulation of DON biosynthesis by FgV1 infection. We also made an infectious clone of the mycovirus, FgV1-SD4, and tested if this strain of FgV1 can infect F. graminearum and F. oxysporum by electroporation method of transfection. Although, we could not confirm the transfection of F. oxysporum and F. graminearum, differences in culture morphology and pathogenicity were observed between the transfected and the wildtype strains. If this mycovirus strain and the protocol of transfection can be optimized to infect broad range of F. graminearum and F. oxysporum strains, it can open a possibility of using this FgV1 strain as a potential biocontrol agent against F. graminearum infections to reduce the DON accumulation level in small grain crops due to this fungal disease. A protocol for the overexpression of WFhb1-1 gene using BSMV virus-mediated over-expression (VOX) is also developed. Using a three plasmid BSMV expression system, up to ~30-fold overexpression of WFhb1-1 gene could be achieved in generation T0 of wheat plants, whereas we could detect ~2.5-fold overexpression of the gene in T1. generation transmitted through seeds into the new generation. As far as we know, this is the first report of transmission BSMV-mediated gene overexpression through seeds into the new generation. This has a huge potential for further exploration in the use of BSMV in overexpression of genes in many generations, and optimization of the process for gene editing using CRISPR/Cas9 technique
Senescence Proteomics and Tissue Culture Studies in Prairie Cordgrass and Switchgrass
No full textSenescence in plants is a genetically programmed sequence of biochemical and physiological changes, but little is known about the key players for it in the perennial biomass based biofuel grasses. Leaf proteome of early- and late- senescence germplasm of PCG and SG was analyzed around the senescence period via 2D-DIGE technology combined with Mass Spectrometry. Upon analyzing the manually filtered differentially expressed proteins of after to before senescence, 9 unique proteins were assigned to PCG, and 18 proteins to SG. Before the senescence a constitutive overexpression of 14-3-3 like protein, and GST was observed in ‘late senescing’ germplasm of PCG. Antagonistically, before the onset of senescence, the RAB protein, and SAM synthase were found up regulated in ‘early senescing’ germplasm of PCG compared to ‘late senescing’ germplasm. Before the onset of senescence, three key enzymes of Calvin cycle: Transketolase, Sedoheptulose-1,7-bisphosphatase, and Fructose-bisphosphate aldolase were found to be down-regulated in ‘early senescing’ PCG compared to its ‘late senescing’ germplasm. Overall for after to before senescence in both PCG and SG, ten common proteins were found significantly differentially expressed that included 5 up regulated and 5 down-regulated proteins. xiv A robust tissue culture system was also developed for PCG for its use in future biotechnology projects. Callus of PCG was induced by culturing sterilized mature seeds on the callus induction medium (D3.2), which contained Murashige and Skoog basal medium with 3% sucrose. Additionally, 3 mgL-1 2,4-D, 1 mgL-1 IAA, 7.8 µM CuSO4, 30 µM Silver thiosulphate (STS), and 6 g L-1 Agar were also added in the medium. For regeneration, Murashige and Skoog based medium (D-Reg) which contained Murashige and Skoog basal and sucrose along with 1 mgL-1 BAP, 0.5 mgL-1 GA, 0.2 mgL-1, NAA, 7.8 µM CuSO4, 30 µM STS, and 6 gL-1 Agar was formulated. Copper and STS were found to have beneficial effects on the callus induction and regeneration processes of PCG. After callus induction on D3.2 medium and 3 successive subcultures, calli were transferred onto the D-Reg medium for shoot regeneration. For rooting, half strength Murashige and Skoog with 3% sucrose and 10 µgL-1 NAA was found optimal
Cross-Layer Capacity Optimization In OFDMA Systems: WiMAX And LTE
Get PDFGiven the broad range of applications supported, high data rate required and low latency promised; dynamic radio resource management is becoming vital for newly emerging air interface technologies such as wireless interoperability for microwave access (Wimax) and long term evolution (lte) adopted by international standards. This thesis considers orthogonal frequency division multiple access (ofdma) system, which has been implemented in both Wimax and lte technologies as their air interface multiple access mechanism. A framework for optimized resource allocation with quality of service (qos) support that aims to balance between service provider\u27s revenue and subscriber\u27s satisfaction is proposed. A cross-layer optimization design for subchannel, for Wimax, and physical resource block (prb), for lte, and power allocations with the objective of maximizing the capacity (in bits/symbol/hz) subject to fairness parameters and qos requirements as constraints is presented. An adaptive modulation and coding (amc)-based cross-layer scheme has also been proposed in this thesis by adopting an amc scheme together with the cross-layer scheme to realize a more practical and viable resource allocation. The optimization does not only consider users channel conditions but also queue status of each user as well as different qos requirements. In the proposed framework, the problem of power allocation is solved analytically while the subchannel/prb allocation is solved using integer programming exhaustive search. The simulation and numerical results obtained in this thesis have shown improved system performance as compared to other optimization schemes known in literature
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
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