1,720,964 research outputs found
Induksi Kalus dan Regenerasi Beberapa Genotipe Gandum (Triticum aestivum L.) secara In Vitro
No full text<p>Callus Induction and In Vitro Plant Regeneration of<br />Wheat Genotypes (Triticum aestivum L.). Atmitri<br />Sisharmini, Aniversari Apriana, and Sustiprijatno. Development<br />of a reliable in vitro plant regeneration procedure for<br />wheat is a prerequisite for its improvement by genetic transformation.<br />The purpose of this study was to obtain methods<br />of callus induction and regeneration of wheat genotypes.<br />This experiment was conducted at ICABIOGRAD. Immature<br />embryos from four wheat genotypes, ie Perdix, Naxos Wew,<br />Combi and Fasan were used to induce callus formation and<br />regeneration rate of callus. For the preparation of callus<br />induction medium, MS-L7 basal medium was supplemented<br />with combination of growth regulators 2,4 dichlorophenoxy<br />acetic acid (2,4-D) and 4-amino-3,5,6-trichloropicolinic acid<br />(picloram). While, plant regeneration medium was prepared<br />using MS basal medium supplemented with combination of<br />three growth regulators i.e. IAA, BAP and kinetin. The results<br />showed that genotype, in vitro culture medium and growth<br />regulators played a dominant role in callus induction and<br />plantlet regeneration. All the 4 genotypes responded positively<br />to callus induction, however, variability was observed<br />not only among the genotypes but also within callus<br />induction medium used. The best induction medium was<br />the MS-L7 basal medium supplemented with combination of<br />phytohormon 4 mg/l 2,4-D + 2 mg/l picloram (GIK-3) which<br />showed 100% callus induction frequency. Whereas, the best<br />regeneration medium was shown by MS basal medium with<br />combination of phytohormon 1.5 mg/l BAP dan 0.5 mg/l<br />kinetin (RG3). Regarding plant regeneration, Perdix was the<br />most responsive genotype to be regenerated with regeneration<br />frequency of 57.33%. The successfully acclimatized<br />planlets in greenhouse were obtained from Perdix and<br />Naxos Wew genotypes. These results will potentially facilitate<br />genetic transformation research of wheat in Indonesia.</p></jats:p
Pembentukan Genotipe Padi Berumur Sangat Genjah melalui Kultur Antera
No full text<p>Development of Very Early Maturing Rice Genotypes through Anther Culture. Iswari S. Dewi, A. Dinar Ambarwati, Aniversari Apriana, Atmitri Sisharmini, Ida H. Somantri, Bambang Suprihatno, and Iman Ridwan. Rice is the most important food crop in Indonesia. Increase in production is needed due to population increase. Rice production in rainfed area is contributed the second after irrigated area. Rainfed condition requiring very early maturity (90-104 days) varieties. Rice anther culture can be applied to accelerate obtainment of doubled haploids (DHs) or pure lines needed in rice breeding. The experiment was aimed to obtain pure lines for developing very early maturing and high yielding rice varieties. Materials used for anther culture were F1s of Fatmawati/Kinamase, Inpari 1/Kinamase, Fatmawati/ Waseaikoku, Inpari 1/Waseaikoku, Fatmawati/IR71146, Inpari 1/IR71146, OM4495/Silugonggo, IR7146/Dodokan, and IR71730/OM1490. Anther culture media were N6 + NAA 2,0 mg/l + kinetin 0,5 mg/l for callus induction, MS+ NAA 0,5 mg/l + kinetin 2,0 mg/l for plantlet regeneration, and MS + 0,5 mg/l IBA for rooting. Putrescine 10-3 M was added to callus induction and regeneration media. The results shown that calli forming green plantlet (CFGP) were ranged from 0.25 to 83.33%. Fatmawati/Kinamase gave the highest CFGP (245 calli), followed by Inpari 1/Kinamase (78 calli) and Fatmawati/ Waseaikoku (68 calli). Total green plantlets obtained were 2.038 plantlets. After plantlet acclimatization and greenhouse grow-out, we obtained 507 DHs. The evaluation of 100 DHs at farmer field (Ciranjang District in Cianjur), based on their 50% heading date of 65 days, resulted in 33 lines cathegorized as very early maturing lines (+100 days). They were 18 lines from Fatmawati/Kinamase, 5 lines from Inpari 1/Kinamase, 8 lines from Fatmawati/Waseaikoku, and 2 lines from Inpari 1/ Waseaikoku.</p><p> </p><p><strong>Abstrak</strong></p><p>Padi (Oryza sativa L.) merupakan komoditi pangan terpenting di Indonesia. Peningkatan produksi diperlukan seiring dengan peningkatan jumlah penduduk. Lahan sawah tadah hujan merupakan lumbung padi kedua setelah sawah irigasi. Kondisi lahan sawah tadah hujan memerlukan varietas-varietas padi berumur sangat genjah (90-104 hari). Teknik kultur antera dapat digunakan untuk mempercepat perolehan tanaman dihaploid (DH) atau galur murni dalam pemuliaan padi. Penelitian ini bertujuan untuk mendapatkan galur-galur murni yang akan digunakan dalam perakitan padi berdaya hasil tinggi dan berumur sangat genjah. Bahan tanaman yang digunakan untuk kultur antera adalah malai dari tanaman F1 hasil persilangan Fatmawati/Kinamase, Inpari 1/Kinamase, Fatmawati/Waseaikoku, Inpari 1/Waseaikoku, Fatmawati/IR71146, Inpari 1/ IR71146, OM4495/Silugonggo, IR7146/Dodokan, dan IR71730/OM1490. Media kultur antera adalah N6 + NAA 2,0 mg/l + kinetin 0,5 mg/l untuk media induksi kalus, MS+ NAA 0,5 mg/l + kinetin 2,0 mg/l untuk media regenerasi, dan MS + 0,5 mg/l IBA untuk media perakaran. Putresine 10-3 M ditambahkan pada media induksi kalus dan regenerasi. Hasil penelitian menunjukkan bahwa kalus yang menghasilkan tanaman hijau (KMTH) berkisar antara 0,25-83,33%. Persilangan Fatmawati/ Kinamase memberikan KMTH tertinggi (245 kalus), diikuti oleh Inpari 1/Kinamase (78 kalus) dan Fatmawati/ Waseaikoku (68 kalus). Total tanaman hijau yang diperoleh adalah 2.038 planlet dihaploid, namun diperoleh 507 tanaman setelah planlet diaklimatisasi dan tanaman ditumbuhkan di rumah kaca. Evaluasi terhadap 100 DH dilakukan di lahan petani Ciranjang, Cianjur. Berdasarkan hari berbunga 50% (65 hari setelah semai), diperoleh 33 galur yang termasuk kategori sangat genjah (dipanen +100 hari). Galur-galur tersebut adalah 18 galur dari persilangan Fatmawati/Kinamase, 5 galur dari persilangan Inpari 1/Kinamase, 8 galur dari persilangan Fatmawati/ Waseaikoku, dan 2 galur dari persilangan Inpari 1/ Waseaikoku.</p></jats:p
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
Pengembangan Populasi Mutan Penanda Aktivasi: I. Transformasi Padi Japonica Tropis Lokal Sulawesi cv. Asemandi dengan bantuan Agrobacterium tumefaciens
No full text<p>The rice transformation technology<br />is not only provides valuable methods for the introduction<br />of useful genes into rice plant to improve important<br />agronomic traits, but also helps in studying gene function<br />and regulation based on rice genome sequence information.<br />Knockout of genes by insertional mutagenesis is a straightforward<br />method to identify gene functions. One of the<br />methods to develop rice mutants is through genetic transformation<br />mediated by Agrobacterium using activation<br />tagging by Ac-Ds system. A study was done with an objective<br />to obtain mutant rice of local tropical japonica cv. Asemandi<br />through genetic trans-formation mediated by Agrobacterium<br />tumefaciens. The transformation was conducted using<br />Agrobacterium vector with the strain of Agl-1 containing<br />activation tag construct. The result of experiment showed<br />that it has been obtained 17 independent line (304 plants)<br />transgenic Asemandi containing activation tag construct.<br />These starter lines will be used as materials to develop<br />several generations of stabil rice mutant through selfing.</p></jats:p
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