1,720,966 research outputs found
EKSTRAK DAUN JERUK PURUT (Citrus hystrix DC) SEBAGAI INSEKTISIDA LARVA NYAMUK Aedes albopictus
Full text linkKaffir lime is one of the plants that produce secondary metabolites. This plant can be used as intercropping plant in the Agroforestry project. Part lime leaves have been used by communities as a refresher, stimulant and insecticide. This study aims to determine the yield of kaffir lime leaves extract and its toxicity against larvae of Aedes albopictus. The extraction method used in this study was maceration with methanol solvent. Yield of extraction Kaffir lime leaves was 8.16%. Toxicity test of Kaffir lime leaves extract against larvae of Aedes albopictus with 24 hours treatment were 2430 ppm for LC50 and 3760 ppm for LC90. This result is classified to the category of low.Keywords : kaffir lime leave, secondary metabolite, intercrooping, ectract, toxicity.</em
Kematian ikan nila pada budi daya keramba jaring apung di Desa Aranio dan Tiwingan Lama, Kabupaten Banjar, Kalimantan Selatan
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Penampakan Morphologi Kulit Luar Marmut Terhadap Pemberian Minyak Atsiri Tanaman Zodia Secara Rutin
Full text linkMinyak atsiri zodia merupakan salah satu minyak atsiri yang mempunyai daya penolak dari aktivitas nyamuk menghisap darah. Minyak tersebut dapat dikembangkan menjadi bahan pelindung tubuh maka perlu dilakukan penelitian tentang keamanan bahan ini terhadap manusia (pemakai). Karena pemakaian berhubungan langsung dengan permukaan kulit maka penelitian ini difokuskan pada pengamatan terhadap penampakan morfologi kulit akibat pemaparan minyak atsiri zodia. Pengujian dilakukan denga uji iritasi primer menggunakan metode Draize dengan cara mengolesi minyak atsiri konsentrasi 5% ke kulit marmut. Pengamatan dilakukan setiap hari meliputi pengamatan morfologi kulit marmut secara makrokospis (eritema dan edema), perubahan warna kulit serta kehalusan kulit. Pengamatan juga dilakukan terhadap perubahan tingkah laku selama penelitian. Hasil pengamatan terhadap semua sampel kulit marmut yang diolesi minyak atsiri zodia tidak menunjukkan adanya tanda-tanda kerusakan kulit baik eritema maupun edema. Kulit yang diolesi minyak atsiri menunjukkan tekstur kulit yang lembut, mengkilat dan licin, yang berbeda dari kulit yang tidak diolesi minyak atsiri. Pengamatan perilaku marmut tidak menunjukkan adanya perilaku keracunan seperti tidak punya nafsu makan, muntah-muntah, diam atau agresif. Kesimpulan yang dapat diambil dalam penelitian ini adalah minyak atsiri zodia dengan konsentrasi 5% tidak menyebabkan inflamasi pada kulit marmot, bahkan kulit marmut menjadi lebih lembut dan halus
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
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