1,720,955 research outputs found
Pesticide use in urban environment and food safety
No full textPesticides are the most cost-effective way of pest management; nevertheless, the concern is about the non-target impacts due to their extensive and intensive use in urban agricultural and non-agricultural settings. The current research investigated the fate and behaviour of four extensively used pesticides, glyphosate, 2,4-D, chlorothalonil, and dimethoate, in terms of sorption-desorption, degradation (half-life), and plant uptake from soils to assess potential human and environmental health hazards. Mostly, the rate-determining step of pesticide sorption in urban landscape soils involved chemisorption processes through exchanging or sharing electrons that followed the pseudo-second-order kinetic model. As evidenced by the Freundlich isotherm model, pesticides get partitioned into heterogeneous surfaces of soil organic matter (OM) and clay minerals and then diffused into soil micropores. Soil OM, oxides of Al and Fe, and contents of clay and silt were positively correlated with the distribution coefficient (Kd) of pesticides in urban soils, while alkaline pH and sand content negatively correlated with Kd values. Well-decomposed soil OM, consisting of C–H and C–O functional groups, enhanced pesticide sorption, whereas partially decomposed/undecomposed OM facilitated the desorption process. Desorption of pesticides was favoured in almost all the selected urban soils due to adverse hysteresis effects. In contrast, the degradation rate constant (k) values (day−1) for the studied pesticides were inversely proportional to those of organic carbon (OC), silt, clay, and Fe and Al oxides and directly proportional to pH and sand content in soils. The half-life (DT50) values (days) of all four pesticides in five soils positively correlated with OC, clay, silt, and oxides of Fe and Al, whereas soil pH and sand content exhibited a negative correlation. The calculated values of environmental indices, groundwater ubiquity score (GUS), and leachability index (LIX), for the selected pesticides, indicate their potential portability into water bodies, affecting non-target organisms as well as food safety. The evaluation for human non-cancer risk of these pesticides, based on hazard quotient (HQ) and hazard index (HI), suggested that exposure of adults and children to soils contaminated with 50% of initially applied concentrations through ingestion, dermal, and inhalation pathways might cause negligible or no non-carcinogenic risks. In case of plant growth study, the detected leftover residue (LoR) of glyphosate, 2,4-D, chlorothalonil, and dimethoate were above EU-MRLs in almost all the spinach and lettuce samples. Multivariate analysis revealed a significant negative correlation between LoR of selected pesticides in leafy salad vegetables and soil properties, particularly OC, silt, Fe, and Al oxides. In contrast, LoR positively correlated with pH, sand and clay content. The calculated values of aHI indicated that the consumption of leafy salad vegetables grown in soils spiked at 10 times higher (D10×) than the recommended doses (DR) of dimethoate and chlorothalonil poses a potential acute health hazard (aHI >100%) to children, whereas chronic health hazards based on hazard quotient (HQ >1) pointed out the potential threat for both adults and children. Our present study, for the first time, provides awareness of the non-target impacts of pesticide contamination in urban environments so that legislators can set new guidelines for the safe application of pesticides in urban landscapes, particularly in home gardens, to ensure food safety. Therefore, pesticides should be applied judiciously at recommended concentrations in urban landscapes, mainly on impervious surfaces, to minimize their impacts on human and environmental health
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
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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