1,720,953 research outputs found
The effect of nicotine on monocytes : A study on differentiation, antigen presentation and phagocytosis
No full textMakrofager har en central funktion i både det medfödda och adaptiva immunförsvaret genom fagocytos och antigenpresentation. Nikotin, den beroendeframkallande substansen i tobaksprodukter som snus och cigaretter, har visat sig modulera immunförsvaret och påverka makrofagernas funktion genom att interagera med nikotin-acetylkolinreceptorer (nAChR) på immunceller. Studier tyder på att nikotin kan påverka makrofagernas differentiering och polarisation,antigenpresentation, cytokinproduktion samt modulera cellernas förmåga till fagocytos. Syftet med denna studie var att undersöka om nikotin påverkar makrofagdifferentiering och polarisation, MHC-uttryck samt fagocytos i primära monocyter från olika bloddonatorer. Syftet var även att undersöka uttrycket av α7- och α4β2-nAChR på makrofager med eller utan nikotinexponering. Primära humana monocyter isolerades från leukocytkoncentrat och differentierades till vilande makrofager (M0) samt polariserades till pro-inflammatoriska (M1) och anti-inflammtoriska (M2) makrofager med eller utan närvaro av nikotin. Flödescytometri och qPCR användes för att analysera polarisationsmarkörer och MHC-uttryck, fagocytos av fluorescens märkta aluminiumpartiklar samt för att undersöka uttrycket av α7, α4, och β2 subenheter. Resultaten visade att nikotin skiftar makrofag polarisation mot en M2-lik makrofagfenotyp genom att minska uttrycket av M1-associerade markörer som CD86. En uppreglering av generna α4 och α7 observerades i vissa makrofagtyper vilket kan öka makrofagernas känslighet för nikotin. Det uppvisades ingen skillnad i fagocytisk förmåga efter nikotinexponering. Studien indikerar att nikotin kan modulera immunförsvaret genom att främja en anti-inflammatorisk makrofagfenotyp. Det belyser även hur nikotin kan interagera med makrofager. Vidare studier behövs för att fastställa om nikotin påverkar makrofagernas fagocytiska förmåga.Macrophages play a central role in the innate and adaptive immunity through phagocytosis and antigen presentation. Nicotine, the addictive substance found in tobacco products such as snus and cigarettes, has been shown to modulate the immune system and affect macrophage function by interacting with nicotinicacetylcholine receptors (nAChRs) on immune cells. Studies suggest that nicotine can affect macrophage differentiation and polarization, antigen presentation,cytokine production and phagocytic ability. This study aimed to investigate whether nicotine influences macrophage differentiation and polarization, MHC expression and phagocytosis in primary monocytes from different blood donors. It also examined the expression of α7- och α4β2-nAChR on macrophages with or without nicotine exposure. Primary human monocytes were isolated from leukocyte concentrate and differentiated into resting macrophages (M0) and polarized into pro inflammatory (M1) and anti-inflammatory (M2) macrophageswith or without nicotine. Flow cytometry and qPCR were used to analyze polarization markers and MHC expression, phagocytosis of fluorescently labeled aluminum particles and expression of α7, α4, och β2 subunits. Results showed that nicotine shifts macrophage polarization toward an M2-like phenotype by reducing the expression of M1-associated markers such as CD86. Upregulation of the α7 and α4 genes was observed in some macrophages, which may increase their sensitivity to nicotine. No difference in phagocytic capacity was observed after nicotine exposure. The study indicates that nicotine can modulate the immune system by promoting an anti-inflammatory macrophage phenotype and highlights how nicotine interacts with macrophages. Further studies are required to determine whether nicotine affects phagocytic capacity of macrophages
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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