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: 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: Pendugaan parameter model hidden markov dan deret waktu hidden markov
Abstrak: Hidden Markov adalah suatu model yang merupakan gabungan dari kejadian yang diamati dan faktor penyebab terjadinya suatu kejadian (stare) yang tidak diamati secara langsung. Dalam model ini diasumsikan faktor penyebab terjadinya suatu kejadian berkemban,= menurut aturan rantai Markov di mana state saat ini hanya dipengaruhi oleh state kemarin dan bebas terhadap state yang lalu.
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