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 Specific Positive Transcription Factor1 (Pit1|Hinf1) pada Sapi Friesian Holstein di BIB Lembang, BBIB Singosari, dan BET Cipelang
Abstrak: Gene Pit-1 or POU1F1 or GHF1 is identified as the pituitary specific transcription factor that regulates the expression of the growth hormone (GH) and Prolactin (PRL) genes in the anterior pituitary. This study was aimed to identify polymorphism of the Pit1|Hinf1 gene from the collected DNA extraction by using Polymerase Chain Reaction – Restriction Fragment Length Polymorphism (PCR-RFLP) methods. A total of 89 dairy cattles, were used from BIB Lembang (17 hds), BBIB Singosari (32 hds), and BET Cipelang (40 hds). A totally number of 37 beef cattle that were used for a comparison, namely Simmental (12 hds), Limousin (14 hds), Angus (5 hds), and Brahman (5 hds) from BET Cipelang. Three genotypes were indentified, namely AA (611 bp), AB (611 bp, 367 bp, 244 bp) and BB (367 bp, 244bp), genotypes resulting two alleles namely A and B alleles. The frequency of the B allele was higher than that of A allele (B=0.625-0.794 vs A=0.206-0.375); meanwhile in beef cattle the frequencies of these two alleles were diverse by breeds. The Pit1 gene in dairy cattle and beef cattle of Simmental and Limousin was in an equilibrium (χ2calculation<χ2table), while those for Angus and Brahman could not be analized. The highest heterozygosity value of dairy cattle was found in population BET Cipelang, while in beef cattle the highest one was in Brahman. The conclusion was that Pit1|Hinf1 gene in HF cattle from BIB Lembang, BBIB Singosari, and BET Cipelang; as well as beef cattle from BET Cipelang were polymorphic.
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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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