1,721,004 research outputs found
Evolution of the Z-Scheme of Electron Transport in Oxygenic Photosynthesis
Get PDFWe start with the discussion of the photosynthetic unit, based on the experiments of Emerson and
Arnold (1932a, 1932b), continue with the first two-quantum proposal by Rabinowitch (1945, 1956), Emerson's
Red drop (1943) and Emerson Enhancement Effect (1957) and various action spectra made for understanding the
roles of the photosynthetic pigments. The experimental work of Kok (1959) and the theoretical model by Hill and
Bendall (1960) were followed soon thereafter by the seminal papers of Duysens et al. (1961) and Duysens and
Amesz (1962), in which the two photosystems were shown to be connected, in series, by cytochrome, which can
be photooxidized by photo system I and photoreduced by photosystem II. Further, Witt et al. (1961) and others,
cited in this paper, made refinement of the Z-scheme
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
Newly isolated Chl d-containing cyanobacteria
No full text© Zhejiang University Press, Hangzhou and Springer-Verlag Berlin Heidelberg 2013. Stromatolites are sedimentary structures formed by microbial mats that are typically found in limestone-or dolostone-rich environments. Shark Bay, Australia, has abundant examples of living marine stromatolites. Although the stromatolites from Shark Bay are only about 2000–3000 years old, they are similar to fossilized evidence of life found on Earth up to 3.5 billion years ago. Using infra-red light centred at 720 nm, new chlorophyll d-containing microorganisms were isolated from the living stromatolites (collected from Shark Bay, Western Australia) and red algae on mangrove pneumatophores (collected from the Georges River, Sydney, Australia) and enriched in KES+ seawater medium. Microscopic examination of the red-light enriched cultures confirmed that they are Acaryochloris-like cyanobacteria. Using cyanobacterial-specific 16S rRNA gene primers, we obtained almost full length sequences of 16S rDNA from the newly isolated Chl d-containing cyanobacteria. The sequences shared 98% identity with Acaryochloris marina MBIC11017. Interestingly, the strain isolated from stromatolites (designated as “ssball1” strain) was more similar to Acaryochloris sp CR111A while the strain isolated from Georges River (designated as “Mangrove1” strain) was more closely related to Acaryochloris sp CCMEE 5401, which was isolated from an inland “lake”, Salton Sea in California,. Pigment composition of the newly isolated strains were determined using HPLC, However, no obvious differences were noted. Chl d was the major photopigment while Chl a was present as a minor photopigment, about 2%–3.5 % of the total chlorophyll
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
Evolution of the Z-Scheme of Electron Transport in Oxygenic Photosynthesis
Get PDFWe start with the discussion of the photosynthetic unit, based on the experiments of Emerson and
Arnold (1932a, 1932b), continue with the first two-quantum proposal by Rabinowitch (1945, 1956), Emerson's
Red drop (1943) and Emerson Enhancement Effect (1957) and various action spectra made for understanding the
roles of the photosynthetic pigments. The experimental work of Kok (1959) and the theoretical model by Hill and
Bendall (1960) were followed soon thereafter by the seminal papers of Duysens et al. (1961) and Duysens and
Amesz (1962), in which the two photosystems were shown to be connected, in series, by cytochrome, which can
be photooxidized by photo system I and photoreduced by photosystem II. Further, Witt et al. (1961) and others,
cited in this paper, made refinement of the Z-scheme
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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