Judul: Keragaan genetik gen hormon pertumbuhan pada sapi pesisir Sumatera Barat
Abstrak: Sapi pesisir Sumatera Barat merupakan salah satu sumber daya genetik sapi lokal yang memiliki bentuk dan ukuran tubuh paling kecil dibandingkan sapi lainnya di Indonesia, seperti sapi aceh, sapi madura, sapi bali dan sapi peranakan ongole (PO). Keunikan sapi pesisir menjadi salah satu alasan dasar atas kajian molekuler terhadap gen hormon pertumbuhan (GH) yang diduga sebagai salah satu gen utama (major gene) yang berperan penting dalam proses pertumbuhan. Penelitian ini bertujuan untuk mengetahui keragaman, sekuens unik dan hubungan polimorfisme gen GH dengan bobot badan dan ukuran-ukuran tubuh baik pada sapi pesisir maupun pada sapi bali, sapi limousin dan sapi simmental sebagai pembanding.
Keyword: GH gene polymorphism, Bali cattle, Simmental cattles, Padang Pariaman, DNA isolation

Judul: Identifikasi Keragaman Genetik Gen Reseptor Hormon Pertumbuhan (GHR|AluI) pada Sapi Bali:
Abstrak: One of factor affects in growing is Growth Hormone Receptor (GHR). GHR is required for GH to carry out its effects on target tissues. The objective of the study was to estimate genetic diversity of the GHR|AluI in Bali, Limousin, Simmental and Pesisir cattle. Genotyping was performed on 248 animals, including 162 Bali, 21 Limousin, 17 Simmental and 48 Pesisir cattle breeds. Single Nucleotide Polymorphisms (SNP) has been found in exon 10, coding for the cytoplasmic domain of GHR, which was located at position 81 bp (A/G) induce amino acid substitutions Ser/Gly. Genotype frequencies of Bali cattle AA (0.988), GG (0.006) and AG (0.006) were evidenced for the GHR|AluI monomorphism, but largerly different from Limousin GG (0.667), AA (0.238) and AG (0.095), Simmental AG (0.529), GG (0.471) and AA (0.000), Pesisir AA (0.604), GG (0.375) and AG (0.021) were the evidenced of polymorphism. It was suggested that homozigosity (monomorphism) in Bali cattle could be affected by adaptability in extreme environmental conditions such as poor nutrition and improper manajement practice. It also could be affected by natural selection and phenotype plasticity phenomena.
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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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