1,721,044 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
Parental Effects and Commercial-Scale Sperm Cryopreservation Techniques for Blue Catfish
No full textCatfish are an important U.S. aquaculture species, with the channel catfish (Ictalurus punctatus) female by blue catfish (I. furcatus) male hybrid constituting most of the harvest. Hatchery issues persist with male blue catfish due to late sexual maturity, lethal sperm collection procedures, and variable sperm quality. There is also a lack of biomarkers that can be used to predict fresh and cryopreserved sperm quality. Thus, the objectives were to (i) relate male morphometrics, hormones, and sperm parameters to offspring traits; (ii) examine parental contributions to offspring traits using cryopreserved sperm; (iii) pinpoint physiological biomarkers of fresh and frozen-thawed sperm quality and cryotolerance; and (iv) develop new sperm freezing technology using large volume straws (2.5 mL). In this thesis, it was demonstrated that male broodstock size was positively related to offspring performance, cryopreserved sperm kinematic traits were positively related to hatching success, and maternal and paternal effects were significant throughout early ontogeny. Moreover, males with “good and “bad” sperm quality had varying concentrations of sperm fatty acids, where levels of monounsaturated (MUFA) and n-6 polyunsaturated fatty acids (PUFA) predicted sperm quality. Finally, sperm frozen at -20ºC/min with methanol (10%) and 100 mmol trehalose had similar results to fresh sperm. Overall, this research will identify biomarkers related to sperm quality and offspring performance. Results also establish the groundwork for future commercial-scale gene banking for an economically important farm animal, the blue catfish
Fundamental aspects of sperm biology for ecologically and economically important bivalve species in Alabama: Cellular signaling, morphology, and density quantification
Get PDFThe Eastern oyster, Crassostrea virginica, and freshwater mussels, Ligumia subrostrata and Lampsilis straminea, are significant keystone species in the Eastern United States. These bivalves both provide invaluable environmental enrichment services such as biofiltration and habitat stabilization. Oysters are economically valuable as they are one of the largest contributors to shellfish aquaculture production, while freshwater mussels are of interest due to their ecological contributions and intricate reproductive tactics and life histories. This thesis conducted studies on fundamental aspects of sperm biology for C. virginica, L. subrostrata and L. straminea.
Productive water along the coastline of Alabama supports many C. virginica farms, which usually rely on oyster seed provided by hatcheries. High fertilization success can increase oyster aquaculture production, and many aspects of sperm biology are linked to fertilization success, such as sperm motility. Thus, this thesis investigated the physiological aspects regulating sperm motility initiation. Different salinity, pH, and ion activation medias all impacted sperm activity parameters. These findings can be used to enhance fertilization success and assist with development of short-term storage and cryopreservation media.
Alabama is a global hotspot for freshwater mussel diversity. Unfortunately, they are in steep decline. Conservation efforts are focusing on propagation techniques to save these imperiled organisms. However, there is limited information regarding seasonal sperm production and morphology, as well as efficient techniques to quantify sperm production regarding freshwater mussels. Thus, this thesis examined sperm densities and morphology across the spawning season of L. subrostrata and L. straminea. Both species displayed an increase and subsequent decrease in sperm concentration over the sampling period as well as an increase in sperm head morphology over time. Tools were also developed using microspectrometery and regressions to accurately estimate sperm concentrations. The seasonal spawning data and microspectrometery techniques can contribute towards propagation efforts and cryopreservation techniques of freshwater mussels
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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