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: 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: 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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