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SELEKSI KETAHANAN BEBERAPA GENOTIPE PADI TERHADAP PENYAKIT HAWAR DAUN BAKTERIRN(XANTHOMONAS ORYZAE PV. ORYZAE)
No full textWIRA HADIANTO. Seleksi ketahanan beberapa genotype padi terhadap penyakit hawar daun bakteri (Xanthomonas oryzae pv. oryzae), dibawah bimbingan Bakhtiar sebagai pembimbing ketua dan Lukman Hakim sebagai pembimbing anggota.Penelitian ini bertujuan untuk mengetahui dan mendapatkan genotipe padi yang tahan terhadap penyakit hawar daun bakteri (HDB). Penelitian ini dilaksanakan di rumah plastic Fakultas Pertanian Universitas Syiah Kuala, Banda Aceh, mulai bulan Februari 2014 sampai Januari 2015. Inokulum daun padi yang terinfeksi HDB dikumpulkan dari Gampong Blang Kecamatan Blang Bintang Kabupaten Aceh Besar, pada musim tanam 2013/2014. Semua bahan tanam (71 genotipe), masing-masing terdiri atas 5 tanaman dalam 1 ulangan dan diulang 3 kali. Penanaman dilakukan dalam bak plastic dan ditempatkan dalam rumah plastic Fakultas Pertanian Unsyiah Banda Aceh. Inokulasi bakteri dilakukan dengan cara pengguntingan daun padi untuk pelukaan sebagai jalan masuk bagi infeksi bakteri pada saat tanaman berumur 42 hari setelah tanam (HST). Pengamatan percobaan 1 dilakukan terhadap periode inkubasi dan panjang lesio. Percobaan 2 dilakukan untuk mengevaluasi reaksi ketahanan terhadap bakteri Xoo. Varietas yang tahan terhadap HDB pada fase vegetatif ditanam kembali dalam pot dengan menggunakan Rancangan Acak Kelompok (RAK) non factorial dengan 3 ulangan. Adapun peubah-peubah yang diamati meliputi tinggi tanaman dan jumlah anakan umur 15, 30, 45 dan 60 HST, umur berbunga, tinggi tanaman saat panen, jumlah anakan produktif, umur panen, panjang malai, jumlah biji per malai, presentase gabah bernas, presentase gabah hampa, bobot 1000 butir gabah dan berat biji per pot.Percobaan 1. Uji hipersensitivitas menunjukkan bahwa gejala penyakit (nekrosis) terlihat jelas akibat terinfeksi bakteri Xoo yang diamati 48 jam setelah penyuntikan. Masa inkubasi paling lama dijumpai pada IR-BB27, Limboto, Inpari 10, Situ Patenggang, Sirendeh Semantuk Wayla, Tamboen, Sepasie, Bontok dan Arias. Genotipe yang menunjukkan reaksi tahan terhadap HDB dengan tingkat keparahan penyakit berdasarkan panjang lesio adalah IR-BB27, Inpari 1, Limboto, Tuwoti, Inpari 10, Lekat Rambot Linuet, Rom Mokot, Paki Gajah, Tamboen, Bo 100, Sipasie, Bo Minyek, Bontok, Sirendeh Semantuk Wayla dan Sambei.Percobaan 2. Berdasarkan seleksi terhadap 7 genotipe yang menunjukkan reaksi tahan pada fase vegetatif yaitu genotipe Rom Mokot, Situ Bagendit, Tamboen, Towuti dan IR-BB27. Namun pada fase generatif yaitu genotipe IR-BB27 menunjukkan reaksi tahan, dua genotipe agak tahan terhadap bakteri Xoo yaitu Rom Mokot dan Tamboen. Hasil penelitian menunjukkan bahwa genotipe berpengaruh sangat nyata terhadap tinggi tanaman umur 30, 45, 60 HST, tinggiiitanaman saat panen, jumlah anakan umur 15, 30, 45, 60 HST, jumlah anakan produktif, umur berbunga, umur panen, jumlah biji per malai, persentase gabah berisi, persentase gabah hampa, berat 1000 butir dan berat biji per pot. Namun berpengaruh tidak nyata terhadap tinggi tanaman umur 15 HST dan panjang malai. Hasil terbaik berdasarkan berat 1000 butir gabah dijumpai pada genotipe Towuti dan berat biji per pot dijumpai pada genotipe IR-64.Kata kunci : Xanthomonas oryzae pv. oryzae, hawar daun bakteri, genotipe padi
Seleksi ketahanan beberapa genotipe padi terhadap penyakit hawar daun bakteri (Xanthomonas oryzae pv.oryzae)
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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
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