Judul: Pengaruh Konsentrasi Colchicine Terhadap Pertumbuhan Dendrobium spectabile Dalam Kultur in vitro
Abstrak: Dendrobium spectabile is one of orchid species that can be found in Irian Jaya and Solomon Islands. This orchid has high economic value because of the unique and appealing shape. One of effective alternative to increasing productivity of D. spectabileis using in vitro culture with adding colchicine. Plants were given colchicines could generate changes in physical form as the leaves grow larger and the growth much faster. The purpose of this research is to identify the effect of colchicine concentration to the growth levels of Dendrobium spectabile in in vitro culture. The concentrates of colchicines which used in this research are 0,5 mg/l, 1,0 mg/l, 1,5 mg/l, and 2,0 mg/l. Data collected were the number of live explants, height, number of leaves, changing color of leaves, and large of leaves. The result of this research indicates that the concentration of colchicine gives a real effect to the height of explants and the number of leaves. To know better in changes of plants significantly, needs to do further research about adding colchicines concentration, the length of time that required in research, and diverse media treatment.
Keyword: in vitro culture., concentrate, Dendrobium spectabile, colchicine

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).
Keyword: 

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.