1,720,958 research outputs found
POTENSI MINYAK DAUN CENGKEH SEBAGAI PENGENDALI PLANOCOCCUS MINOR (MASK.) (PSEUDOCOCCIDAE; HOMOPTERA) PADA TANAMAN LADA
Get PDFMinyak daun cengkeh dapat diguna-kan untuk mengendalikan serangga hama, ter-masuk kutu putih. Planococcus minor meru-pakan kutu putih yang berperan sebagai serang-ga vektor penyakit kerdil pada tanaman lada. Penelitian telah dilakukan yang bertujuan un-tuk mengetahui potensi minyak daun cengkeh (MDC) sebagai bahan pengendali P. minor. Pe-nelitian dilakukan di laboratorium dengan menggunakan kutu P. minor yang berasal dari tanaman lada dan diperbanyak pada umbi ken-tang. Perlakuan terdiri dari tiga konsentrasi MDC (5; 2,5; 1,25%) dan kontrol. Aplikasi di-lakukan secara kontak dan pada pakan (umbi kentang). Nimfa P. minor disemprot suspensi MDC, kemudian kutu tersebut dipindahkan pada umbi kentang secara individual. Aplikasi pada pakan dilakukan dengan mencelupkan kentang ke dalam suspensi MDC, dikering-anginkan dan selanjutnya diinfestasikan kutu secara individual. Setiap perlakuan mengguna-kan 40 ekor kutu. Rancangan yang digunakan adalah rancangan acak lengkap. Penelitian lan-jutan dilakukan di rumah kaca dengan menggu-nakan MDC 2,5% yang disemprotkan ke bibit lada setiap satu dan dua minggu sekali. Hasil uji laboratorium menunjukkan bahwa MDC dapat mengakibatkan kematian P. minor pada semua konsentrasi yang diuji dan pada konsen-trasi 5% memberikan kematian kutu hampir 90%. Perlakuan pada pakan mengakibatkan mortalitas yang lebih tinggi dibanding dengan penyemprotan langsung pada kutu. Selain itu, perlakuan MDC dapat mengurangi jumlah keturunan yang dihasilkan baik pada penyem-protan langsung maupun perlakuan pada pakan. Uji di rumah kaca dengan MDC 2,5% yang disemprotkan setiap minggu dapat menurunkan populasi kutu namun tidak berbeda nyata de-ngan perlakuan lain dan kontrol. Hasil pene-litian ini mengungkapkan bahwa MDC berpo-tensi untuk mengendalikan P. minor pada tanaman lada apabila dilakukan penyemprotan yang lebih sering (dua kali seminggu).
Mengenal "PSYLID" Pada Tanaman Cengkeh
No full text“paylid” adalah sebutan dari serangga-serangga dari suatu super family Paylloidae, ordo homoptera. Serangga dewasanya menyerupai tonggeret (cicada), ukuran kecil, umumnya sangat aktif dan gerakannya cepat (Richard & Davies, 1977). Peranan serangga ini sebagai hama tanaman seperti Paylla pyracola pada pear dan P. mati pada apel; sebagai vector penyakit tanaman seperti Diadhorina citri, merupakan vector utama penyakit CVPD pada jeruk di Indonesia (Borror et al, 1981; Kalshoven, 1980). Adanya Paylid khususnya pada tanaman cengkeh belum pernah dilaporkan walaupun Kalahoven (1980) menyebutkan adanya suatu Paylid pada Eugenia (jambu air dan jambu bol). Cirri-ciri paylid cengkeh adalah ; serangga dewasanya (imago) berwarna jingga tua, panjang 1,0 – 1,5 mm; dan aktif, nimfanya sedikit kemerahan, panjang 0,5 – 1,0 mm; bentuknya pipih dan ditutupi oleh lapisan bening berlilin berwarna putih.“paylid” adalah sebutan dari serangga-serangga dari suatu super family Paylloidae, ordo homoptera. Serangga dewasanya menyerupai tonggeret (cicada), ukuran kecil, umumnya sangat aktif dan gerakannya cepat (Richard & Davies, 1977). Peranan serangga ini sebagai hama tanaman seperti Paylla pyracola pada pear dan P. mati pada apel; sebagai vector penyakit tanaman seperti Diadhorina citri, merupakan vector utama penyakit CVPD pada jeruk di Indonesia (Borror et al, 1981; Kalshoven, 1980). Adanya Paylid khususnya pada tanaman cengkeh belum pernah dilaporkan walaupun Kalahoven (1980) menyebutkan adanya suatu Paylid pada Eugenia (jambu air dan jambu bol). Cirri-ciri paylid cengkeh adalah ; serangga dewasanya (imago) berwarna jingga tua, panjang 1,0 – 1,5 mm; dan aktif, nimfanya sedikit kemerahan, panjang 0,5 – 1,0 mm; bentuknya pipih dan ditutupi oleh lapisan bening berlilin berwarna putih
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
- …
