1,720,955 research outputs found
Perbandingan struktur anatomi dan kadar klorofil antara daun terinfeksi dan tidak terinfeksi penyakit kuning pada tanaman lada
No full textDeteksi awal penyakit kuning yang disebabkan oleh nematoda parasit Radopholus similis dan Meloidogyne incognita serta cendawan patogen Fusarium oxysporum dan Fusarium solani relatif sulit, tanaman dapat diduga terinfeksi setelah menampakkan gejala menguning pada bagian daun. Perubahan struktur anatomi daun lada yang terinfeksi penyakit kuning sejauh ini belum ada laporan tertulis. Penelitian ini dilakukan untuk membandingkan struktur anatomi daun lada yang tidak terinfeksi dan terinfeksi penyakit kuning. Penelitian ini menggunakan dua metode yaitu whole mount untuk membuat sayatan paradermal dan free-hand technique untuk membuat sayatan transversal. Pengukuran kadar klorofil menggunakan spektrofotometer pada panjang gelombang 649 nm dan 665 nm. Hasil pengamatan menunjukkan bahwa kerapatan stomata dan panjang sel epidermis berbeda nyata antara tanaman lada yang terinfeksi penyakit dengan yang sehat dan tidak berbeda nyata pada karakter indeks stomata, tebal kutikula atas dan bawah, tebal epidermis atas dan bawah, tebal bunga karang, tebal palisade, panjang dan lebar sel stomata, panjang dan lebar sel penjaga, lebar sel epidermis, tebal hipodermis atas dan bawah, tebal daun, luas daun, dan kadar klorofil. Daun tanaman lada terinfeksi memiliki stomata lebih rapat dan panjang sel epidermis lebih pendek dibandingkan dengan daun pada tanaman tidak terinfeks
Perubahan Struktur Anatomi Daun dan Kadar Klorofil Lada yang Terserang Penyakit Kuning
No full textDeteksi awal penyakit kuning relatif sulit. Tanaman dapat diduga terinfeksi setelah menampakkan gejala menguning pada bagian daun. Perubahan struktur anatomi daun lada yang terinfeksi penyakit kuning sejauh ini belum ada laporan tertulis. Penelitian ini dilakukan untuk membandingkan struktur anatomi daun lada yang tidak terinfeksi dan terinfeksi penyakit kuning. Penelitian ini menggunakan dua metode yaitu whole mount untuk membuat sayatan paradermal dan free-hand technique untuk membuat sayatan transversal. Pengukuran kadar klorofil menggunakan spektrofotometer pada panjang gelombang 649 nm dan 665 nm. Hasil pengamatan menunjukkan bahawa kerapatan stomata dan panjang sel epidermis berbeda nyata antara tanaman lada yang terserang penyakit dengan yang sehat. Tanaman lada yang terserang penyakit cenderung mengalami peningkatan nilai kerapatan stomata, indeks stomata, tebal kutikula atas dan bawah, tebal epidermis atas dan bawah, tebal bunga karang dan tebal palisade, sedangkan kadar klorofil, panjang dan lebar sel stomata, panjang dan lebar sel penjaga, panjang dan lebar sel epidermis, tebal hipodermis atas dan bawah, dan tebal daun cenderung mengalami penurunan. Kadar klorofil tidak berbeda nyata antara tanaman lada sehat dan sakit, tetapi cenderung mengalami penurunan kadar klorofil pada daun lada yang terserang penyakit kuning sebesar 67,3%
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
No full textWe 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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