Judul: Physical and Chemical Properties of Local Sheep Meat from Education and Research Unit of Jonggol (UP3J) in Different Genotype Calpastatin
Abstrak: Karkas merupakan produk utama usaha peternakan ternak potong. Karkas dipotong menurut potongan komersialnya. Selain karkas, masih ada juga bagian non karkas yang dapat dimakan. Pada umumnya, pengukuran kualitas karkas dari suatu ternak dilakukan setelah ternak tersebut dipotong. Namun kemajuan dalam bidang biologi molekuler memungkinkan upaya tersebut dapat dilakukan sebelum ternak dipotong yaitu dengan identifikasi DNA, dengan cara mencari keragaman gen yang mengontrol sifat ekonomis. Calpastatin merupakan sebuah gen yang berfungsi untuk menghambat degradasi protein sel-sel otot. Penelitian ini bertujuan untuk mengetahui sifat fisik dan kimia daging domba jonggol pada genotipe calpastatin yang berbeda. Penelitian ini dilakukan selama delapan bulan dari bulan Maret sampai Oktober 2010 di Laboratorium Lapangan IPT Ruminansia Kecil dan Laboratorium IPT Ruminansia Besar, Fakultas Peternakan, Institut Pertanian Bogor. Penelitian ini menggunakan ternak domba ekor tipis jantan yang berasal dari Jonggol sebanyak sembilan ekor dengan bobot rata-rata 21,41±2,35 kg saat dipotong. Perlakuan terdiri atas dua macam genotipe calpastatin, yaitu genotipe MM dan MN dengan ulangan lima dan empat kali. Peubah yang diamati adalah daya mengikat air, pH, susut masak, keempukan, kadar air, kadar protein, kadar lemak, kadar abu, dan kadar karbohidrat. Data dianalisis dengan uji Tukey. Hasil penelitian menunjukkan genotipe MM dan MN tidak berbeda pada hasil uji sifat fisik dan kimia daging domba. Rataan nilai hasil uji pH adalah 5,4575±0,149, daya mengikat air 38,5±3,755, keempukan 2,926±0,6625, dan susut masak 45,795±3,68. Rataan nilai hasil uji kadar air adalah 75,705±4,069, protein 20,81±4,36, lemak 1,03±0,853, abu 0,9575±0,162, dan karbohidrat 1,697±0,931.
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Judul: Bobot Karkas, Non Karkas, Potongan Komersial Karkas Dan Komponen Karkas Domba Ekor Tipis Jantan Pada Genotipe Gen Calpastatin Yang Berbeda
Abstrak: Calpastatin is the spesific inhibitor of μ- and m-calpain. Calpastatin activity is related with the rate of postmortem proteolysis and tenderness. Increase in calpastatin activity has the effect of increasing muscle mass (hyperthropy) and decrease in meat tenderness. Calpastatin can be used as an indicator for the selection of livestock that have a high carcass quality. Purpose of this research is to find out the relationship between gene genotype of calpastatin with the growth of carcass and non carcass component of male thin tale sheep. Experimental design used is the Tukey test with two genotypes (MM and MN). Result showed that genotype differences in calpastatin gene was significantly different to slaughter weight, empty body weight, carcass weight, percentage of carcass and non carcass weight. Component carcass and non carcass weight was not affect also by the research. This research also did not affect the commercial cut of carcass. In addition, this research did not affect the physical composition of commercial cut, except for weight of meat on the shank and breast cut (P<0,05).
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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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