Judul: Identifikasi Gen Aroma Pada BC5F1 Ciherang-Pandan Wangi dan BC4F1 Ciherang-Mentik Wangi
Abstrak: The demand of high quality rice becomes increasingly in Asian market and around the world. The increase in productivity and quality of Indonesian agriculture has continued, such as improving new aromatic rice variety to have good characteristics (resistant to pest, ) which is like non-aromatic rice. The aim of this research was to develop new varieties of non transgenic aromatic rice by induction of aroma gene (mutated badh2) from aromatic varieties (Pandan Wangi or Mentik Wangi) to non aromatic varieties rice (Ciherang). Rice BC5F1 CP (Ciherang/Pandan Wangi) and BC4F1 CM (Ciherang/Mentik Wangi) that used in this research were the result from previous research with site-directed crossing method. Selection of plant was done by PCR with RM223 marker for CP and Bradbury marker for CM. Visualization of DNA sample by PCR was done by using gel agarose 3% for CP and 2% for CM. DNA amplification result of BC5F1 CP with RM223 marker can distinguish the band pattern of aromatic and non aromatic with band size 140 bp and 160 bp. In addition, DNA amplification result of BC4F1 CM with Bradbury marker produced DNA band size 580 bp, 355 bp and 257 bp. The succeed in introgression of aroma gene from Pandan Wangi or Mentik Wangi to Ciherang was showed by heterozygote band.
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Judul: Identifikasi Gen badh2 termutasi Pada Padi BC4F1 Ciherang-Mentik Wangi (CM) dan BC5F1 Ciherang- Pandan Wangi (CP)
Abstrak: Development of aromatic rice varieties based non-transgenic required to obtain an aromatic rice with a high potential. The objectives of this experiment were to study of introduction of aromatic trait from aromatic into nonaromatic rice through crossing and to screen the plants by using molecular markers linked to aromatic trait. Pandan Wangi and Mentik Wangi will be used as aromatic donor parents meanwhile Ciherang are as recurrent parents. Pandan Wangi and Mentik Wangi will be crossed with Ciherang to produce aromatic hybrids. PCR-based markers that will be used in this research i.e. Bradbury primer for detecting the aromatic trait in Ciherang x Mentik Wangi and RM223 primer for Ciherang x Pandan Wangi. Result of the research showed that BC4F1 and BC5F1 hybrid plants have been obtained from both of the crossing combination. Screening of the plants showed that the tested plants have been proved carrying the aromatic trait indicated by the formation of DNA band heterozygous with size 580, 355, and 257 bp for Ciherang x Mentik Wangi and 140 and 160 bp for Ciherang x Pandan Wangi.
Keyword: Pandan Wangi, Mentik Wangi, Ciherang, badh2

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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