Judul: Konsentrasi MDA Darah, Hati, dan Telur serta Profil Darah Puyuh Petelur yang Diberi Ekstrak Gambir (Uncaria gambir Roxb).
Abstrak: Gambir mengandung katekin yang merupakan sumber antioksidan alami. Antioksidan dapat mencegah stress oksidasi yang ditunjukkan oleh persentase MDA (malondialdehida). Penelitian ini bertujuan untuk mengetahui pengaruh penambahan ekstrak gambir yang mengandung antioksidan dicampur dengan ransum terhadap kadar MDA darah, hati, dan telur serta profil darah puyuh petelur. Penelitian ini menggunakan 200 ekor puyuh yang dipelihara selama 6 minggu. Rancangan penelitian ini adalah Rancangan acak lengkap (RAL) dengan 5 perlakuan dan 4 ulangan. Peubah yang diamati adalah profil darah, serta kadar MDA di darah, hati, dan kuning telur. Data dianalisa dengan ANOVA dan uji Duncan. Perlakuan yang diberikan adalah P0= ransum kontrol, P1= ransum kontrol + 0.1% ekstrak gambir, P2 = ransum kontrol + 0.2% ekstrak gambir, P3 = ransum kontrol + 0.3% ekstrak gambir, P4 = ransum kontrol + vitachick (5gram/7liter air minum). Suplementasi ekstrak gambir sebesar 0.3% pada pakan puyuh menurunkan hemoglobin, eritrosit, dan leukosit dibanding perlakuan lain namun masih dalam taraf normal.
Keyword: Uncaria gambir Roxb, malondialdehida, profil darah, puyuh, petelur

Judul: Suplementasi Ekstrak Gambir (Uncaria gambir Roxb) dalam Air Minum Sebagai Antioksidan terhadap Kualitas dan Kandungan MDA Telur Ayam Petelur Isa-Brown.
Abstrak: Gambier extract contains a polyphenols chemical compound that act as antioxidant. This study aimed to evaluate the effect of supplementation gambier extract on the quality and MDA (malondialdehyde) content of eggs. A completely randomized design was used in this experiment. The variables observed were egg quality (egg weight, albumin percentage, yolk percentage, yolk color, egg shell percentage, egg shell color, average shell thickness, egg shape index, albumin high, and Haugh Unit) and MDA content of yolk. This study used 90 of 38 weeks old of Isa Brown layer hen reared until 43 weeks old. The treatments were R0 = kontrol water, R1 = drinking water contained gambier extract 20 mg kg-1 BB), R2 = drinking water contained gambier extract 40 mg kg-1 BB. The results showed that supplementation of gambier extract decreased MDA content of yolk. Gambier extract supplementation significantly (P<0.05) increased eggshell color score, high of albumin, and Haugh Unit. The conclusion of the study was that gambier extract increased quality of egg and potential as antioxidant for the laying hen.
Keyword: egg quality, MDA, Uncaria gambier Roxb, yolk

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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