1,720,956 research outputs found
PENGARUH MINYAK NABATI Piper aduncum TERHADAP JAMUR Sclerotium rolfsii MENURUT KETINGGIAN LOKASI TANAM DAN WAKTU PENYULINGAN
No full text<p class="IsiabstrakIndonesia">Pengujian efektifitas antifungal pestisida nabati <em>Piper aduncum</em> untuk pengendalian cendawan <em>Sclerotium rolfsii</em> pada ketinggian lokasi tanam dan waktu penyulingan berbeda telah dilakukan sejak Agustus 2014 sampai April 2015 di Laboratorium Pasca Panen dan Parasitologi Kebun Percobaan Balai Penelitian Tanaman Rempah dan Obat, Laing Solok, Sumatera Barat. Penelitian terdiri dari tiga sub kegiatan: (1) Penekanan diameter koloni, (2) Perkecambahan sklerotia, dan (3) Penekanan biomassa koloni. Percobaan disusun dalam Rancangan Acak Lengkap (RAL) faktorial, 9 perlakuan diulang empat kali. Perlakuan yang diuji adalah sumber bahan <em>P</em><em>.</em><em> aduncum</em>; dari dataran rendah (A1) 20 m dpl, dataran menengah (A2) 460 m dpl dan dataran tinggi (A3) 1000 m dpl sebagai faktor I. Faktor II adalah waktu penyulingan; satu jam ke-1 (W1), satu jam ke-2 (W2) dan satu jam ke-3 (W3). Hasil penelitian menunjukkan bahwa minyak <em>P. aduncum</em> dari dataran rendah mempunyai aktifitas antifungal lebih tinggi dibanding dataran menengah dan tinggi, dengan penekanan diameter koloni secara berurutan 92,77; 91,02 dan 87,77%; penekanan biomassa koloni masing-masing 94,85; 92,52 dan 90,40%; penekanan perkecambahan sklerotia masing-masing 60; 48,89 dan 36,67%. Hasil penyulingan satu jam ketiga mempunyai aktifitas antifungal lebih baik dari satu jam kedua dan kesatu, dengan penekanan diameter koloni secara berurutan 98,52; 89,63 dan 83,42%; penekanan biomassa koloni masing-masing 97,67; 93,83 dan 86,67%; penekanan perkecambahan sklerotia masing-masing 71,11; 46,67 dan 27,78%.</p></jats:p
POTENSI EKSTRAK GAMBIR, SIRIH-SIRIHAN DAN SAMBILOTO UNTUK MENGENDALIKAN Aphis schneideri PADA TANAMAN Klausena
No full text<p class="IsiabstrakIndonesia">Pestisida yang berasal dari tanaman relatif aman terhadap organisme bukan sasaran dan ramah lingkungan dibandingkan dengan pestisida berbahan aktif kimia sintetik. Gambir, sirih-sirihan dan sambiloto merupakan tanaman potensial sebagai sumber pestisida nabati. Tanaman-tanaman tersebut mengandung senyawa fenolik, minyak atsiri dan metabolit lainnya yang belum dieksplorasi pemanfaatannya. Penelitian bertujuan untuk mengobservasi potensi ekstrak tanaman gambir, sirih-sirihan, dan sambiloto dalam menanggulangi serangga hama <em>Aphis schneideri </em>yang sering menyerang tanaman<em> </em>klausena. Penelitian menggunakan rancangan acak lengkap, empat ulangan. Perlakuan yang diuji terdiri dari ekstrak gambir, sambiloto, dan sirih-sirihan, masing-masing dengan tingkat konsentrasi yang berbeda (8, 12, dan 16 ml l<sup>-l</sup>) serta kontrol (tanpa perlakuan). Penelitian dilaksanakan di Rumah Kaca Kebun Percobaan Balai Penelitian Tanaman Rempah dan Obat Laing, Solok dari Februari sampai Agustus 2015. Parameter yang diamati adalah persentase kematian (mortalitas) nimfa dan imago. Hasil penelitian menunjukkan bahwa ekstrak tanaman gambir, sirih-sirihan, dan sambiloto bersifat insektisidal terhadap serangga hama <em>A. schneideri</em>. Ekstrak gambir pada konsentrasi 16 ml l<sup>-l</sup> mampu mengendalikan nimfa dan imago <em>A. schneideri</em> 100% pada 6 jam setelah aplikasi, sedangkan ekstrak sambiloto pada tingkat konsentrasi yang sama dengan gambir memerlukan waktu 36 jam setelah aplikasi untuk mencapai mortalitas 100%. Ekstrak sirih-sirihan memiliki efikasi terendah dibanding gambir dan sambiloto dengan tingkat mortalitas hanya mencapai 63,83% (nimfa) dan 65,44% (imago) pada 36 jam setelah aplikasi. Ekstrak gambir paling potensial sebagai pestisida nabati untuk mengedalikan <em>A. schneideri</em> dibandingkan dengan ekstrak sirih-sirihan dan sambiloto. Perlu pengujian lapangan untuk mengetahui keefektifan ekstrak gambir dalam mengendalikan serangan hama<em> A. schneideri </em>pada tanaman klausena.</p></jats:p
PESTISIDA NABATI KAYUMANIS DAN SERAIWANGI UNTUK PENGENDALIAN HAMA PENGGULUNG DAUN NILAM Pacyzancla stultalis
No full text<em>Botanical pesticide is one of the alternatives to control pest and relatively safe for the environment. Cinnamon oil and citronella oil commonly used as botanical pesticide to control leaf roller</em> Pachyzancla stultalis<em> attack on patchouli, hence maintaining patchouli productivity. This study aimed to find the best botanical insecticide formula made of cinnamon oil and citronella oil to control leaf roller attack without decreasing the quality of patchouli oil. Research was conducted in patchouli farmer's plantation in Solok Regency, Kenagarian Gantung Ciri from January to October 2013. The research was arranged in Randomized Block Design with four treatments (Pesnab KM 40, Pesnab SW 50, synthetic insecticide deltamethrin 25 EC and without pesticide as control) repeated six times. Botanical pesticide, Pesnab KM 40 and SW 50, were formulated using 40 % cinnamon oil (KM 40) and 50 % citronella oil (SW 50). The plant tested was one month old Sidikalang variety in polybags. The KM 40 botanical pesticide formula was more effective to control </em>P. stultalis <em>larvae pest than control and SW 50 botanical pesticide, and as effective as synthetic pesticide. The herb yield, oil yield, oil content and patchouli alcohol (PA) content of KM 40 treatment were not significantly different compared to synthetic pesticide, but higher than control. Patchouli oil components such as alpha pinene, beta pinene, limonene, copaene, karyophylen, guanen, allo-aromadrene and gurjunen, was not significantly different among treatments. Botanical pesticides made from cinnamon oil can be used as alternative to control P. stultalis larvae attack in patchouli.</em><p> </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
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
- …
