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PENETAPAN KADAR BORAKS PADA KERUPUK OLAHAN DI DISTRIK HERAM KOTA JAYAPURA MENGGUNAKAN SPEKTROFOTOMETER UV-VIS
Get PDFPENETAPAN KADAR BORAKS PADA KERUPUK OLAHAN DI DISTRIK HERAM KOTA JAYAPURA MENGGUNAKAN SPEKTROFOTOMETER UV-VIS Fitry Anreny1), Eva Susanty Simaremare1), Rusnaeni1)1)Program Studi Farmasi, Fakultas MIPA Universitas Cenderawasih, Jayapura, Kampus UNCEN Waena, Jl. Perumnas III Waena- Jayapura 99358Email*: [email protected]               Borax is a compound with the chemical name sodium tetraborate or borax salt (Na2B4O7.10H2O) and boric acid (H3BO3). Other names are borax crystals, pijer, or gendar that are commonly misused by manufacturers to make crackers more crisp and attractive. The purpose of this study is to identify and perform the assay borax using qualitative methods to test the flame, and turmeric paper; as well as the quantitative test using Spectrophotometer UV-Vis. Samples were taken from 5 crackers that are processed Heram District Jayapura City. The results were obtained maximum wavelength of 545 nm. Prior to use of the samples taken from the District Heram this method is validated. Results from the study showed a linear calibration curve on rentamg 0,1 to 1,2 µg/ml with a regression equation y = 0,5143x + 0,1233 and the correlation coefficient (r) = 0,9988. LOD acquisition value was 0,142 mg/ml and the LOQ 0,474 mg/ml; accuracy or recovery value is 96,924%; precision or results of standard deviation and standard deviation relatife or coefficient of variation (CV) is 1,026% and 1,066%. The validation of the test showed that all valid methods that have been done, so it can be carried out on a sample of the assay borax. From the results of this study as many as 5 crackers samples were tested, three samples tested positive reveal any qualitative and quantitative testing borax obtainedthe lowest levels of 6,556 µg/g, 424,033 µg/g and the highest level of 908,556 µg/gram. Keywords: Borax, Crackers, Curcumin, Spectrophotometer UV-Vis.ABSTRAK Boraks adalah senyawa dengan nama kimia natrium tetraborat atau garam boraks (Na2B4O7.10H2O) dan asam borat (H3BO3). Nama lainnya adalah bleng kristal, pijer, atau gendar sering disalahgunakan oleh produsen untuk membuat kerupuk lebih renyah dan tampak menarik. Tujuan penelitian ini adalah untuk mengidentifikasi dan melakukan penetapan kadar boraks menggunakan metode kualitatif dengan uji nyala api, dan kertas kunyit; serta uji kuantitatif dengan menggunakan Spektrofotometer Uv-Vis. Sampel diambil dari 5 kerupuk olahan yang berada di Distrik Heram Kota Jayapura. Hasil penelitian diperoleh panjang gelombang maksimum 545 nm. Sebelum digunakan terhadap sampel yang diambil dari Distrik Heram metode ini divalidasi. Hasil dari penelitian menunjukkan kurva kalibrasi linear pada rentamg 0,1-1,2 µg/ml dengan persamaan regresi y = 0,5143x + 0,1233 dan koefisien korelasi (r) = 0,9988. Perolehan nilai LOD adalah 0,142 μg/ml dan LOQ 0,474 μg/ml; nilai akurasi atau perolehan kembali yaitu 96,924%; presisi atau hasil simpangan baku dan simpangan baku relatife atau koefisien variasi (KV) adalah 1,026% dan 1,066%. Dari uji validasi tersebut menunjukkan bahwa semua metode yang telah dilakukan valid, sehingga dapat dilakukan penetapan kadar boraks pada sampel. Dari hasil penelitian ini sebanyak 5 sampel kerupuk yang diperiksa, 3 sampel yang diuji secara kualitatif positif ditemukan adanya boraks dan dengan pengujian kuantitatif diperoleh kadar terendah 6,556 μg/gram, 424,033 μg/gram dan kadar tertinggi 908,556 μg/gram. Kata kunci: Boraks, Kerupuk, Kurkumin, Spektrofotometer UV-Vi
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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