Judul: Pengaruh konsentrasi colchicine terhadap pertumbuhan bibit tumbuhan pulai (Alstonia scholaris R. Br.)
Abstrak: Pulai is one of useful plant in Indonesia. This plant has efficacy as a herb. Use of traditional herbs currently tends to increase. To anticipate the increasing use of traditional herbs and exploitation, it is necessary to improve the quality and production of medicinal plant cultivation. It also required to increase the benefits of pulai so it is possible to keep its sustainability. To improve the quality and value of pulai benefits is by providing chemical colchicine which has the ability to form poliploid plants. This research aims to examine the effect of colchicine concentration on the growth of pulai seedling on nurseries media. The research was conducted in Tissue Culture Laboratory, Research Center for Science Bogor Agriculture University from May to August 2010. This research was compiled using statistical methods of RAL One Factorial. There are four treatments using colchicine with different concentrations and control. Colchicine concentration used was 0.5 mg/l, 1.0 mg/l, 1.5 mg/l, and 2.0 mg/l. Each treatment had 10 replications for a total of 50 units. Colchicine was given until three days consecutively, then controlled the plant for two weeks as a break. The treatment was repeated six times. Observation was done in one week during the break, for all experimental units include its parameters such as the growth of height of shoot, diameter, and number of leaves. Plant cultivation includes the provision of green hyponex fertilizer, hormones of the shoot, bactericide, fungicide, amoxycilin, and weeding. The results of this research indicate that the highest average height of shoot and diameter is found at a concentration of 1.0 mg/l, while the average of highest number of leaves is found on control plants. Overall, the result of statistical test on three parameters is not significantly different, but it can not be denied from a possibility of poliploid. The conclusion of this research is the concentration of colchicine in this research does not provide a significantly different effect on the growth of seedlings pulai, but it can not be denied that there was a tendency of poliploid on seedlings given treatment.
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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: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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