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Pengaruh Konsentrasi Minyak Sereh Wangi (Cymbopogon nardus (L.) Rendle) terhadap Kualitas Sampo dan Uji Aktivitas Antijamur Candida albicans
No full textKetombe adalah keadaan di mana terjadi pengelupasan lapisan tanduk
secara berlebih pada kulit kepala dan membentuk sisik-sisik yang halus (Malonda
dkk., 2017) .Ketombe muncul berupa rasa gatal yang disebabkan oleh infeksi
jamur dengan skuam berwarna putih abu-abu dalam jumlah banyak yang dapat
mengakibatkan berkurangnya kenyamanan dalam beraktivitas (Budiman dkk.,
2015). Jamur Candida albicans merupakan jamur yang dapat menyebabkan
ketombe sebesar 50%, diikuti dengan 24% Aspergillus niger, 16% Cryptococcus
spp dan 10% Penicillum spp. dibuktikan dengan adanya penelitian yang dilakukan
oleh Roselin, (2015) pada sampel ketombe yang diambil dari 50 relawan dengan
rentang usia mulai dari 18 tahun hingga 25 tahun dan diketahui bahwa Candida
albicans merupakan jamur utama penyebab ketombe.
Ketombe dapat diobati dengan sampo antiketombe, namun penggunaan
zat antiketombe kimia dalam sampo dapat menyebabkan beberapa efek samping.
Untuk mengatasi hal tersebut dibutuhkan agen antiketombe alam seperti minyak
atsiri yang diambil dari tanaman sereh wangi (Cymbopogon nardus (L.) Rendle)
yang kemudian diformulasikan menjadi sampo antiketombe. Digunakan minyak
sereh wangi karena mengandung sitronelal yang mempunyai aktivitas antijamur
terhadap Candida albicans. Minyak sereh wangi diambil menggunakan metode
destilasi uap, untuk menentukan kualitas minyak sereh wangi hasil destilasi maka
dilakukan beberapa pengujian diantaranya yaitu indeks bias, bobot jenis dan
kandungan sitronelal minyak. Dilakukan pengujian KHM (Konsentrasi Hambat
Minimum) sampo untuk mengetahui konsentrasi terendah dari sampo yang masih
dapat menghambat pertumbuhan Candida albucans.
Jenis penelitian yang dilakukan adalah true experimental laboratories.
Pada uji KHM dilakukan dengan metode difusi sumuran, digunakan sampo
dengan konsentrasi minyak 1%, 2%, 3%, 4% dan 5%, kontrol negatif yaitu basis
sampo tanpa minyak sereh wangi (F0) dan sampel antiketombe yaitu sampo
antiketombe yang beredar di pasaran. Didapatkan KHM sampo terhadap Candida
albicans yaitu sebesar sampo dengan konsentrasi minyak 2%. Kemudian dibuat
sampo dengan konsentrasi minyak sereh sebesar 4% (F1), 6% (F2), dan 8% (F3)
untuk uji aktivitas antijamur serta uji sifat fisika kimia sampo yang meliputi uji
organoleptis, pH, viskositas, dan tinggi busa. Data organoleptis dan KHM
dianalisis secara deskriptif. Data viskositas, tinggi busa dan pH dianalisis secara
statistik dengan metode Oneway ANOVA untuk mengetahui perbedaan bermakna
antar kelompok.
Hasil pengujian organoleptis menunjukkan bahwa konsentrasi minyak
sereh wangi dapat mempengaruhi warna, bau, dan bentuk sampo. Pada uji
viskositas, pH dan tinggi busa diketahui bahwa semakin besar konsentrasi minyak
sereh wangi maka semakin rendah viskositas, pH dan tinggi busa sediaan sampo.
Uji aktivitas antijamur sampo menunjukkan bahwa semakin besar konsentrasi
minyak sereh wangi dalam sampo maka semakin besar pula aktivitas antijamur
yang dihasilkan. Diameter hambat sampo F0 < F1 < F2 < F3. Hasil uji Oneway
ANOVA menunjukkan perbedaan yang signifikan pada data viskositas, pH, dan
tinggi busa antara F0, F1, F2 dan F3. Hasil uji Oneway ANOVA menunjukkan
adanya perbedaan bermakna pada aktivitas antijamur semua sampo yang meliputi
F0, F1, F2, F3 dan sampo sampel (S)
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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