Judul: Identifikasi Keragaman Gen  Pituitary-Specific  Positive Transcription Factor 1 (Pit1) pada Kerbau Lokal (Bubalus bubalis) dan  Sapi Friesian-Holstein
Abstrak: Pit-1, POU1F1 or GHF1 has been identified as the pituitary specific transcription factor that regulates the expression of the growth hormone (GH) and Prolactin (PRL) genes in the anterior pituitary. The Use of polymorphic markers in breeding programmes could make selection more accurate and efficient. A total of 320 individuals from four Indonesian buffalo population and 45 individual FH from nine population were genotyped for the Pit1|Hinf1 gene polymorphism by the polymerase chain reaction and restriction fragment length polymorphism (PCR- RFLP). The gene polymorphism was detected only in FH cattle. The frequency of genotype AA is 2%, AB is 44%, BB is 53%. The frequency of A allel is 25% and B allel is 75 %, but no polymorphism were detected in 320 Indonesia buffalo population.
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Judul: Identifikasi Keragaman Gen Pituitary-Spesific Positive Transcription Factor 1 (Pit1|StuI) Exon 3 pada Sapi FH dengan Metode PCR-RFLP
Abstrak: Pituitary-Specific Positive Transcription Factor 1 (Pit1, POUIF1 or GHF1) gene is a member of the tissue-specific POU-containing transcription factor family. The expression of Pit1 in mammalian pituitary gland is to control the transcription of the genes encoding growth hormone, prolactin (PRL) and the subunits of thyroid-stimulating hormone. This study was aimed to identify polymorphism of the pituitary specific positive transcription factor 1 (Pit1) exon 3 gene in Holstein Friesian (HF) cattle. Total number of samples were 286 heads from BIB Lembang (14), BBIB Singosari (25), BPPT-SP Cikole (81), KPSBU Pasir Kemis (93), and KPSBU Cilumber (73) using PCR-RFLP method by StuI restriction enzyme. Genotyping the Pit1 exon 3 gene resulted in two alleles, namely A and C , with three genotypes, namely AA, AC, and CC. The average frequency of the C allele followed by HF cattle in five places was higher (0,916) than the A allele (0,084). CC genotype had the highest average frequency (0,874) than the AC genotype (0,084) and the AA genotype (0,042). Chi-Square analysis showed that HF from BBIB Singosari were in Hardy-Weinberg (HW) equilibrium (2 < 2(0,05)), contrast to HF from BPPT Cikole and KPSBU Pasir Kemis (2 > 2(0,05)) and HF in BIB Lembang and KPSBU Cilumber could not be calculated equilibrium HW. The average values of heterozigosity observation (Ho) for HF studied were under the values of heterozigosity expectation (He), therefore the genetic variation of the Pit1|StuI exon 3 gene was low in these cattles.
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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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