1,720,953 research outputs found
Potensi Ekstrak Lengkuas sebagai Fungisida Nabati untuk Mengendalikan Penyakit Karat Daun Anggur (Phakopsora euvitis)
Get PDFPenyakit karat daun anggur yang disebabkan oleh Phakopsora euvitis merupakan salah satu penyakit penting tanaman anggur. Pengendalian dengan pestisida nabati untuk penyakit ini penting dikembangkan karena pemanfaatannya dapat menekan penggunaan pestisida kimia sintetik yang selama ini diaplikasikan. Penelitian ini bertujuan untuk mengetahui potensi ekstrak lengkuas sebagai fungisida nabati terhadap perkembangan P. euvitis, dan dibandingkan dengan fungisida mankozeb. Metode meliputi persiapan ekstrak lengkuas dalam metanol yang diuapkan, uji daya racun ekstrak lengkuas dan pestisida secara in vitro, penentuan LC50, dan pengujian in planta menggunakan bibit anggur di dalam polibag. Penentuan LC50 dilakukan dengan menggunakan program SAS JMP Statistical Discovery. Uji in planta dilakukan dengan cara penyemprotan suspensi spora (urediniospora) dengan kerapatan 1 x 106 spora.mL-1 dan penyemprotan ekstrak lengkuas atau mankozeb tiga hari setelah inokulasi pada konsentrasi LC90. Hasil penelitian menunjukkan perlakuan ekstrak lengkuas dapat menghambat perkecambahan spora P. euvitis. LC50 ekstrak lengkuas diperoleh sebesar 18,33 ppm dan LC90 sebesar 53.72 ppm; sementara LC50 mankozeb sebesar 65,52 ppm dan LC90 sebesar 190.71 ppm. Pada uji in planta, penggunaan ekstrak lengkuas dengan konsentrasi 53.72 ppm (LC90) dapat menurunkan intensitas penyakit karat daun pada anggur sebesar 16% pada hari ke-18, sementara fungisida mankozeb dengan konsentrasi 190.71 ppm (LC90) menurunkan intensitas penyakit sebesar 26,4% dibandingkan dengan kontrol positif atau tanaman sakit tanpa perlakuan. Ekstrak lengkuas memiliki potensi untuk dikembangkan sebagai pestisida nabati terhadap penyakit karat daun anggurPotency of Galangal Extract as Botanical Fungicide to Control Grape Leave Rust Disease (Phakopsora euvitis)
Grape leaf rust caused by Phakopsora eutivitis is an important disease on grape plants. Botanical pesticide is important to be developed as its application may reduce the usage of synthetic chemical pesticides. This study aimed to determine potency of galangal extract as botanical fungicide against P. euvitis, compared with mancozeb. The methods were galangal extract preparation in evaporated methanol, in vitro toxicity test of galangal extract for LC50 determination, and in planta test using grape seedlings in polybags. LC50 was determined by using SAS JMP Statistical Discovery Program. In planta test was carried out by spraying urediniospore suspension with density of 1 x 106 spores.mL-1, followed by galangal extract or mancozeb spraying at LC90 concentration three days after inoculation. The result showed that galangal extract inhibited spore germination of P. euvitis. LC50 of the galangal extract was 18.33 ppm; LC90 was 53.72 ppm; while mancozeb LC50 was 65.52 ppm and LC90 was 190.71 ppm. In planta experiment showed that galangal extract of 53.72 ppm (LC90) reduced the disease intensity of leaf rust by 16% on the 18th day, while mancozeb of 190.71 ppm (LC90) reduced the disease intensity by 26.4% compared to positive control or untreated-inoculated plants. This study showed that galangal extract is potential to be developed as botanical fungicide to control grape leaf rust diseas
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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