1,720,968 research outputs found
Efektivitas antibakteri senyawa katekin dari ekstrak daun teh (Camelia sinensis L. var assamica) terhadap bakteri Pseudomonas fluorescens
No full text<p>Daun teh adalah salah satu bahan alam yang dapat digunakan sebagai antibakteri. Zat tersebut dapat juga digunakan sebagai pengawet alami. Penelitian ini bertujuan untuk mengetahui keefektifan daun teh sebagai antibakteri alami dalam menghambat bakteri <em>Pseudomonas fluorescens</em>. Proses ekstraksi dauh teh yang dilakukan dengan metode maserasi. Pemisahan ekstrak daun teh (katekin) dilakukan dengan Kromatografi Lapis Tipis (KLT) analitik dengan variasi eluen yaitu etil asetat:air:asam format (18:1:1), toluena:aseton:asam format (3:3:1) dan kloroform:metanol:air (6,5:3,5:1). Hasil KLT analitik menunjukkan bahwa eluen terbaik adalah etil asetat:air:asam format. Eluen tersebut digunakan untuk pemisahan menggunakan KLT preparatif. Hasil uji antibakteri menunjukkan bahwa isolat 2 dari ekstrak daun teh memberikan efektivitas terbaik sebagai antibakteri <em>P. Fluorescens </em>dengan zona hambat 23,3 mm.</p></jats:p
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
Antimicosis activity of chloroform fraction of ethanol extract Soursop Leaves (Annona muricata, L.)
Get PDFFungal infections are often found in the community, some antifungal drugs have been less effective so it is necessary to look for new candidate drugs as antimycotic, one of the candidates is soursop leaf (Annona muricata, L.). Soursop leaves contain compounds alkaloids, polyphenols, flavonoids, triterpenoids that function as antifungals. The purpose of this study was to determine the antifungal activity of the n-hexane fraction of the Soursop ethanol extract of the fungus Candida albicans and determine the class of compounds that act as antimycotic. Soursop leaf was extracted by maceration method using ethanol 96% then fractionated by partition method using chloroform solvent. The chloroform fraction was tested for antifungal activity against the fungus Candida Albicans by diffusion method with a concentration variation of 10%, 20%, and 30%. then identified by UV-VIS and FTIR spectrophotometry to determine active compounds as antifungals. The results showed that the Soursop leaf chloroform fraction had the highest antifungal activity at a concentration of 30% with an inhibitory diameter of 25.4 mm which was categorized strong. Compounds that are suspected to have antifungal activity from the soursop leaf chloroform fraction are terpenoid compounds. The results of this study are expected to provide scientific information to the public about the benefits of soursop leaves as an alternative treatment for fungal infections caused by the fungus Candida Albicans
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
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