1,720,957 research outputs found
Aktivitas antifungi isolat bakteri asal sarang rayap sebagai biokontrol fungi patogen tanaman
Full text linkSalah satu penyebab penyakit pada tanaman adalah fungi patogen tanaman, seperti Fusarium oxysporum, Colletotrichum gloeosporioides, dan Aspergillus flavus. Pengendalian fungi fatogen tanaman biasanya menggunakan fungisida, namun penggunaan fungisida yang berlebih memiliki dampak negatif terhadap lingkungan, sehingga diperlukan alternatif biokontrol fungi patogen tanaman. Salah satu alternatif biokontrol fungi patogen tanaman merupakan isolat bakteri penghasil antifungi asal sarang rayap. Namun, kajian tentang isolat bakteri dari sarang rayap sebagai agen biokontrol fungi patogen tanaman masih sedikit.Penelitian ini bertujuan untuk mengetahui kemampuan antifungi isolat bakteri asal sarang rayap, kandungan senyawa kimia antifungi yang dihasilkan isolat bakteri dan potensi jenis isolat bakteri yang memiliki aktivitas antifungi terhadap fungi patogen tanaman fungi Fusarium oxysporum, Colletotrichum gloeosporioides, dan Aspergillus flavus. Isolasi bakteri dilakukan dari tiga sampel sarang rayap, yaitu MYN.SR.A, MYN.SR.B, dan MYN. SR.C. Hasil dari isolasi bakteri didapatkan 44 isolat bakteri dan isolat bakteri B7, B13 dan B16 memiliki aktivitas antifungi terbaik. Kandungan senyawa kimia tidak diamati karena hasil uji ekstrak etil asetat isolat bakteri B7, B13, dan B16 menunjukkan hasil negatif. Hasil negatif disebabkan oleh media kultur cair Yeast Extract Glucose Agar kurang sesuai terhadap isolat Bakteri B7, B13, dan B16 sehingga senyawa antifungi belum tersekresikan dengan optimal. Berdasarkan identifikasi gen 16SrRNA isolat bakteri B7, B13, dan B16 merupakan spesies Streptomyces murinus. Genus Streptomyces merupakan salah satu genus bakteri yang memiliki rentang kemampuan antimikrobia yang sangat luas
Students’ Learning Motivation in Online Practicum Courses during COVID-19 Pandemic: A Case of Walisongo State Islamic University
No full textThis research aims to identify student learning motivation in online practicum courses during the COVID-19 pandemic. This study used a quantitative survey method toward 117 biology students at the Walisongo State Islamic University. Data were collected using five-point Likert scale questionnaire. The data show that students learning motivation is in good criteria (75.47%). The percentage breakdown and criteria for each indicator are as follows: concentration 77.9% (good), curiosity 81.06% (very good), enthusiasm 66.67% (good), independence 82.64% (very good) ), readiness 77.78% (good), enthusiasm 66.7% (good), never give up 72.82% (good), and confidence 78.21% (good). This study's result can be used as an evaluation material for designing effective online learning during the COVID-19 pandemic. Keywords: learning motivation, online practicum courses, COVID-19 pandemic. DOI: http://dx.doi.org/10.23960/jpmipa/v21i2.pp120-13
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
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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