1,720,970 research outputs found
Interspecific differences in the response of autotrophic microorganisms to atrazine and S-metolachlor exposure
No full textThis data set contains: (1) Chla_PhytoPAM: Chlorophyll a fluorescence data measured by PhytoPAM device for all replicas and experiment conditions on the green alga Scenedesmus costatus, the diatom Gomphonema parvulum and the cyanobacteria culture Phormidium sp. and Microcystis aeruginosa, (2) Yield_PhytoPAM: Effective quantum yield data measured by PhytoPAM device for all replicas and experiment conditions on the green alga Scenedesmus costatus, the diatom Gomphonema parvulum and the cyanobacteria culture Phormidium sp. and Microcystis aeruginosa., (3) Data_cellular_density_GREEN, Cellular density for the green algae Scenedesmus costatus experiment. Chlorophyll a concentration by cell were calculated directly in RStudio., (4) Data_FAMEs, Data of relative percentage of each fatty acid for both TAGs and polar lipid fractions for all replicas and experiment conditions., (5) Data_lipids, Lipid content for all replicas and experiment conditions. (6) Prise_essai_tot, Weighed mass of culture used for lipid extraction for all replicas and experiment conditions., (7) Nutrients, Nutrients concentration for all conditions and experiments., (8) Temperature_RH, Mean and standard deviation of temperature and relative humidity data during the duration of each experiment., (9) Herbicide_concentration, Herbicide concentration for both abiotic and biotic conditions and for all replicas and experiment conditions. In addition, the Metadata_file contains all the variables present in the above-mentioned files, along with their units, descriptions and comments
Interspecific interactions modulate atrazine and S-metolachlor toxicity on aquatic microbial autotrophs
No full textAtrazine and S-metolachlor are frequently detected herbicides in streams in agricultural areas, sometimes at concentrations of concern that may affect photosynthetic organisms. In the present study, we exposed a coculture of the green alga Enallax costatus, the diatom Gomphonema parvulum and the cyanobacteria Phormidium sp. and Microcystis aeruginosa to a gradient of atrazine and S-metolachlor (0, 10, 100 and 1000 µg·L-1) for 7 days. The results showed that species interactions in a coculture can modulate herbicide toxicity compared to responses observed in monocultures. Green algae and cyanobacteria were more sensitive to atrazine in coculture than in monoculture, while diatoms showed better tolerance in coculture. S-metolachlor affected the chlorophyll fluorescence of organisms in coculture to a greater extent than atrazine, particularly for the green alga and the diatom. Despite its mode of action as an inhibitor of the synthesis of very long chain fatty acids (VLCFAs), S-metolachlor did not result in a significant reduction in these fatty acids. In general, the two herbicides had a more pronounced effect on fluorescence than on lipids in coculture. The modification in photosynthetic organisms composing the coculture was accompanied by a change in fatty acid profiles, reflecting the specific fatty acid profiles of each group of organisms. In addition, herbicide exposure may have caused lipid peroxidation, leading to a decrease in the relative abundance of polyunsaturated fatty acids (PUFAs) in the coculture. This study highlights the importance of considering interspecific interactions in ecotoxicology, as they can modulate herbicide toxicity on aquatic photosynthetic communities. In addition, lipid and fatty acid profiles provide sensitive information that complements ‘traditional’ descriptors such as cell density and photosynthesis parameters. Lipidomics can be used to study changes in coculture composition (community composition) as well as to assess the potential of herbicides to affect organisms at the cellular level
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
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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