Judul: Kandungan Kolesterol, Lemak, Vitamin A dan E dalam Daging, Hati, dan Telur, serta Performa Puyuh dengan Pemberian Ekstrak dan Tepung Daun Katuk (Sauropus androgynus L. Merr) dalam Ransum
Abstrak: Daun katuk (Sauropus androgynus L. Merr) merupakan tanaman obat yang sudah banyak diteliti karena banyak manfaatnya. Beberapa manfaat daun katuk yaitu sebagai tanaman obat keluarga, bahan makanan yang bergizi tinggi, zat pewarna makanan, dan dapat memperlancar air susu ibu. Daun katuk memiliki kandungan serat kasar yang paling tinggi pada beberapa tanaman hijau bahan pakan (23,65%). Penggunaan daun katuk dalam pakan ternak dapat dibuat dengan beberapa metode yaitu dalam bentuk tepung dan ekstrak. Masing-masing metode memiliki keunggulan, bentuk tepung mudah dalam pembuatan tetapi serat kasar yang terkandung masih tinggi dan menjadi hambatan dalam pencernaan khususnya unggas. Bentuk ekstrak yang memiliki kemudahan dalam penyimpanan, dan dalam proses pembuatan ekstrak bertujuan untuk mengambil sebagian atau seluruh zat yang ada di dalam tanaman. Penelitian ini bertujuan untuk mengamati pengaruh perbedaan pemberian ekstrak tepung daun katuk (ETDK) yang dibandingkan dengan tepung daun katuk (TDK) melalui penilaian kandungan kolesterol, lemak, vitamin A dan E pada daging, hati dan telur, serta performa puyuh. Ransum perlakuan yang diberikan terdiri dari empat macam ransum, yaitu ransum basal (R0) sebagai ransum kontrol, R0 + 0,15% ETDK (R1), R0 + 0,30% ETDK (R2), R0 + 10% TDK (R3). Puyuh terbagi atas 4 perlakuan dan 4 ulangan dengan 13 ekor setiap ulangan. Data performa puyuh yang diperoleh dianalisis dengan Rancangan Acak Lengkap (RAL) dan diuji lanjut dengan uji jarak Duncan jika hasilnya berbeda nyata sedangkan data kandungan kolesterol, lemak, vitamin A dan E dianalisis secara deskriptif.
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Judul: Evaluasi pemberian daun katuk(Sauropus androgynus) dalam ransum terhadap kadar kolesterol kuning telur dan karkas ayam petelur
Abstrak: Katuk leaves (Sauropus androgynus) has been using for many years as a medicinal plant and has a capability to increase milk secretion. Farmers have been using katuk leaves as feed supplement for dairy cattles as to increase milk production. So far, there is no report as to whether katuk leaves have been used in laying hens diet. It is estimated that katuk leaves have physiological effects in the body to prevent the synthesis of bile acid secretion and therefore would decrease the production of cholesterol. The objective of this research is to study the effect of katuk leaves addition in the diet on the level of cholesterol in the egg yolk and carcass of laying hens. Seventy two laying hens at the age of 32 weeks, were divided into 4 treatment groups with 3 replications and 6 laying hens each replications. The laying hens were raised for 24 weeks. The treatments were Control (diet without katuk leaves), T1 (diet with 5% katuk leaves), T2 (diet with 10% katuk leaves), and T3 (diet with 15% katuk leaves). This research was carried out from May 2002 until September 2002 in the Center for Life Sciences Study, Bogor Agricultural University. The experimental design was Completely Randomized Design. The data was analyzed using Analysis of Variance (ANOVA). and continued with Contrast Orthogonal Test if the treatment were significantly different. It was concluded that katuk leaves could decrease the level of cholesterol in the egg yolk and carcass cholesterol in laying hens. The addition of katuk leaves decreased egg yolk cholesterol significantly as compared to that of the Control. The addition of katuk leaves in the diet also decreased the level of cholesterol in the carcass, except the carcass from T3 group. The feed consumption of the Control, T1 and T2 groups were higher than those fed the T3 diet. The same pattern occurred for the egg production. The best feed conversion were from the groups fed the T3 and the control diet.
Keyword: katuk leaves (Sauropus androgynus), cholesterol, laying hens, egg yolk, carcass

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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