Judul: Perlakuan Konsentrasi Colchicine pada Kultur In Vitro Jelutung (Dyera costulata (Hook. f.)).
Abstrak: In Indonesia there are two types of Jelutung, those are Dyera costulata (Hook. f.) and Dyera lowii (Hook. f). The sap of this jelutung commonly used for vital industries such as the world's aircraft industry, automotive, electronics, cable wrapping, and home furnishings. As for the results timber jelutung trees that did not produce sap anymore, cut down to create printed materials of the building, drawing table, clogs, engraving, plywood, and pencils (Ministry of Forestry 2008). However, mass-breeding jelutung often constrained by the nature of perishable seed and germinate quickly (recalcitrant) so it can not be kept too long and needed storage technology both seed and vegetative propagation in macro (cuttings) and micro (tissue culture) is needed to provision of seeds in large quantities jelutung (Bathimi 2009). Through the in vitro culture of seeds can be obtained in large numbers and the same, can be reproduced continuously and more efficient place and time. However, in vitro culture itself is also the need for engineering to get the culture results are much better in a fast and obtained results that were far greater. One way is to add a hormone that affects the accelerating growth of the plant itself, the hormone colchicine to double the chromosome number from diploid to tetraploid. The study was conducted in October to December 2011 at the Tissue Culture Laboratory of Environmental Research Center, Bogor Agricultural University (PPLH IPB). The purpose of this study was to identify the effect of giving the concentration of colchicine and colchicine is good and right for the best growth in jelutung in vitro culture. Colchicine concentration used was 0.5 mg / l, 1.0 mg / l, 1.5 mg / l, and 2.0 mg / l. Quantitative data retrieval in the form of the living explants, explants die, high explants, a growing number of roots, root length, leaf number, and a new segment explants. The results of this study indicate that a given concentration of colchicine significantly different influence on the high number of root explants and growing. High highest explant shown in treatment E (2.0 mg / l) with a height of 4.18 cm and the average number of roots of most treatments is shown in E (2.0 mg / l) of 6.20 roots. While the administration did not significantly affect the concentration of colchicine on root length, leaf number, and a new segment explants. The conclusion of this study is the gift of colchicine concentration that gives the highest average was in treatment E (2.0 mg / l).
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Judul: Effect of Colchicine Concentration on The Growth of Jelutung Seedling (Dyera costulata Hook. f.).
Abstrak: Jelutung was included in the dual-purpose tree, which means it can be produce both types of forest product commodities, there are non-wood forest product commodity such as jelutung latex and wood forest product comodity. The latex and wood already known and used by people, during productive time the latex was tapped and the end of cycle the wood are used. Because a lot of utilization big efforts are really needed to improve the quality and productivity of jelutung, so we can conserve that plant to prevent their extinction. One of the efforts to improve the quality and productivity of jelatung is by giving them colchicine. This research were determined to figure out what is the effect of using Colchicine on the growth of Jelutung Seedling on nurseries media. The research was conducted at Tissues Culture Laboratory of the Living Environment Research Center, Bogor Institute of Agriculture. Estimated on January – April 2011. This research was compiled by using the statistical methods of RAL One Factorial. There are 5 treatments in total with 10 replications, thus it makes a total of 50 experimental units. It consists of 4 treatments was given different Colchicine concentrate and one functions as a control. Colchicine concentrate used on this experiment was 0.5 mg/l, 1.0 mg/l, 1.5 mg/l, 2.0 mg/l. Colchicine was given out twice a day for two days, thoroughly, and then a one week recess. The treatment was repeated six times. Observations and measurements was done once in a week for a total of 8 weeks, given the parameter circumstances consists of the shoot’s height and diameter growth, and the numbers of newly-sprout leaves. Plant cultivation includes the provision of green hyponex fertilizer, hormones of the shoot, bactericide, and fungicide. The results of this research indicate that the highest average height of shoot, diameter and the numbers of leaves is found on 2.0 mg/l concentration. According to statistical test, the Colchicine affected the height and diameter of the shoot, but not the amount of leaves, nevertheless, the treatments that was given Colchiline is making a big difference on the average results with one that wasn’t given out Colchiline (control). It is obviously because the Colchiline was really affecting. This research concludes that Colchicine affects the height and diameter of the shoot oh the Jelutung, although it has very minimum effect to the numbers of leaves. Yet it can be said that there is a tendency that poliploid was occurred on the treatment with Colchicine.
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Judul: Konstruksi Persamaan Friedmann Alam Semesta Friedmann-Lemaitre-Robertson-Walker Termodifikasi Materi Gelap Superfluida
Abstrak: Kosmologi merupakan salah satu objek kajian dari teori relativitas umum. Salah satu model dalam kosmologi adalah model kosmologi Friedmann. Model kosmologi Friedmann dibangun berdasarkan asumsi bahwa materi dan energi terdistribusi secara homogen dan isotropik di alam semesta. Teori relativitas umum dapat dimodifikasi melalui pendekatan teori materi gelap superfluida (MGS). Persamaan medan Einstein untuk teori MGS dapat dirumuskan melalui prinsip aksi dengan memodifikasi Lagrangian pada aksi teori MGS. Selanjutnya dengan memilih metrik Friedmann-Lemaitre-Robertson-Walker (FLRW) datar dengan indeks kurvatur sama dengan nol, dapat dibangun suatu bentuk persamaan Friedmann yang dimodifikasi teori MGS.
Keyword: kosmologi, teori materi gelap superfluida, persamaan medan Einstein, metrik FLRW, persamaan Friedmann.