1,721,265 research outputs found
Aspects of osmoregulation in the amphipod Gammarus duebeni : the effects of changing salinity and some potential pollutants
No full textWater and sodium fluxes have been investigated in the euryhelineamphipod Gammarus duebeni (Lilljeborg) in conditions of constant and changing salinity. The effects of some potential pollutants upon osmoregulatory mechanisms have been considered. It appears that G. duebeni is capable of large and rapid (4 minute) changes in apparent permeability in response to salinity fluctuations and that these changes are invariably appropriate to osmoregulatory requirements. Alterations in apparent permeability over the course of long term acclimation to high and low salinities are considered with respect to changes in the fatty acid composition of the gill lipids. Further, lipophilic contaminants are concentrated in the gills and their presence is coincident with changes in lipid composition. Exposure to mercury, cadmium and particularly copper interferes with apparent permeability. Alterations in the rate of sodium uptake approach completion within four hours of sudden salinity changes and occur cyclically in a cycling salinity regime. The presence of mercury reduces sodium uptake as medium salinity falls. This metal depresses the total body sodium concentration of animals in dilute media and totally inhibits gill Na+E+ ATPase activity in Vitro. Mercury also induces diuresis in G. duebeni following transfer from 2% to 100% SW. The findings are discussed in relation to the ecology of the species. Notes are appended on the use of a microprocessor to control experimental fluctuations of environmental variables, specifically salinity.</p
Mr Michael Ellis at work in his laboratory at Mt Stromlo Observatory
No full textMount Stromlo and Siding Spring Observatory - Site, Official Opening, Time Capsule, Comet Tuttle - Prof. Sir Leonard Huxley, Sir John Cockcroft, Prof. Bart J. Bok, Cr. C. D. Renshaw, Prof. O. Eggen, Mr. R. J. Hunt, Prof. D. N. F. Dunbar, Mr. Michael Ellis, James Oddie, Mr. J. F. V. Knight, Dr. A. W. Rodger
Going 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
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
From Pentecost to Dodecaphony
Full text link© 2012 Dr. Andrew Michael Ellis PerkinsThrough analysis of the compositions contained within the portfolio, this thesis describes my idiosyncratic creative processes and how I recognise, define, and fulfil a compositional niche that is both complementary and tangential to my compositional perspective, with the objective of creating new directions in my composition. Using the analogy of the artist as historical bricoleur, the thesis explains how I utilise practice- based research to investigate, analyse, and reinterpret, for my own purpose, compositional techniques and materials of music from important periods of innovation in the history of music composition. I refer to these periods as historic nodal points. Drawing on these historical reference points, the music in the folio reasserts the central importance of melody. The outward radiating construction of the music is not dependent on a fundamental harmonic bass line, but represents a new perspective in composition, a form of centrifugal polyphony that has the melodic and rhythmic freedom of medieval plainchant
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
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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