Judul: Transformasi Genetik Padi (Oryza sativa L.) dengan Gen Penyandi Metallothionein Tipe II dari Melastoma malabathricum L. (MaMt2) Menggunakan Perantara Agrobacterium tumefaciens
Abstrak: Rice production can be decrease caused by abiotic stresses. These abiotic stresses, cause oxidative stress in plants overproducting radical oxygen species (ROS). ROS could cause damage and death in plants cells. The tolerant varieties adapted to abiotic stress could be created by introducing and expressing the abiotic stress tolerant genes. Metallothionein (MT) has an important role to detoxity some heavy-metal ions, e.g. cadmium and mercury by binding these metal ions. MaMt2 gene encoding for metallothionein type II had been isolated from Melastoma malabathricum. We suppose that plant overexpressing this gene would be tolerant to metal ions, including Al. This research had an objective to introduce this MaMt2 gene under the control of pUbiquitin promoter and NosT terminator into rice (Oryza sativa L.) genom. Two rice cultivars i.e. Kasalath and Nipponbare were transformed with MaMt2, through Agrobacterium-mediated gene transfer method. Kasalath is indica rice and Nipponbare is japonica rice. Genetic transformation of rice was carried out on Kasalath and Nipponbare cultivars by using calli of seeds as explants. The calli were obtained from seeds cultivated in 2N6 medium containing 2 mg/L 2.4 D. These 3-4 week old calli (235 calli of Kasalath and 165 calli of Nipponbare) were co-cultivated with A. tumefaciens LBA4404 carrying pIG6-SMt2 containing MaMt2 gene under the control of Ubiquitin promoter and Nos terminator. Co-cultivation was carried out 3 days in the 2N6 media containing 100 mg/L acetosiringone. After cocultivation, the calli were selected in two steps in 2NBK and nN6C media containing 20 and 30 mg/L hygromycin respectively. The resistant calli were regenerated in 2N6 medium containing 0.5 mg/L kinetin. Based on hygromycin resistant calli on hygromycin selection medium, the transformation efficiency in Kasalath was 14.04%, while in Nipponbare was 19.39%. Based on resistant calli on selective medium, the efficiency of regeneration of transgenic shoots in Kasalath was 6.06%, while in Nipponbare was 28.1%. Molecular analysis by PCR showed that two of eleven putative rice transgenic were confirmed as transgenic ones containing MaMt2 transgene under the control of Ubiquitin promoter and NosT terminator. This transgenic rice can be used as source of MaMt2 that can be transferred to other cultivars of rice by conventional crossing.
Keyword: 

Judul: Transformasi genetik Nicotiana benthamiana L. dan kedelai dengan gen MaMt2 penyandi metallothionein tipe II dari Melastoma malabathricum L.
Abstrak: The low pH and high concentration of aluminum (Al) are major limiting factors for crops production. The capability of crops to cope those stresses can be improved by expressing genes controlling adaptation to low pH and high concentration of Al. One of these genes was MaMt2 encoding for metallothionein type II which isolated from Melastoma malabathricum. The objectives of the research were 1) to construct overexpression vector of MaMt2 gene with pIG6 plasmid, 2) to transform Nicotiana benthamiana and soybean with MaMt2 gene, and to analyze the transgenic plants. The MaMt2 gene were successfully fused with the strong promoter pUbiquitin in the pIG6 plasmid, and the recombinant plasmid was introduced into Escherichia coli DH5α by electroporation method. The pIG6-MaMt2 recombinant vector was successfully introduced into A. tumefaciens LBA4404 by triparental mating method (TPM). Genetic transformation was performed by co-cultivating A. tumefaciens LBA4404-pIG6-MaMt2 with N. benthamiana leaf explants and half seed explants of soybean cv. Lumut. The T0 and T1 generations of transgenic plants were already obtained. The integration of MaMt2 transgene into the genom of T0 transgenic plants was confirmed by PCR. Segregation analysis in the T1 generation of N. benthamiana showed that hpt gene was inherited to the offspring in Mendelian pattern and all samples of transgenic plants were heterozygote containing one functional hpt gene. Transformation of cv. Lumut half seed explants with MaMt2 gene was succesful, based on PCR by UbiF and NosTR primer combination. PCR analysis of T1 generation of transgenic soybean showed that MaMt2 gene was transmitted into the offspring indicating that this transgene is integrated in the genome of transgenic soybean plants.
Keyword: transformasi, gen MaMt2, metallothionein, Nicotiana bentha-miana, kedelai

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.
Keyword: