Judul: Pengaruh Lempuyang Gajah (Zingeber zerumbat L.) dan Fraksi Ekstraknya terhadap Kadar Kolestelor, Trigliserida dan Glukosa Darah dan Hati Tikus Sprague Dawley
Abstrak: Lempuyang gajah (Zingiber zerumbet L.) adalah salah satu dari tumbuhan obat tradisional yang sering digunakan sebagai obat luar maupun dalam, disamping sebagai makanan lalapan dan bumbu masakan. Komponen kimia utama yang dikandungnya antara lain minyak atsiri yang terdiri dari senyawa zerumbon, a-pinen, a-kariofilen, kamfer dan sineol. Penelitian ini bertujuan untuk mempelajari pengaruh aktifitas lempuyang gajah dalam bentuk tepung, ekstrak steam distillation, ekstrak etanol 95% dan jamu terhadap kadar kolesterol, trigliserida dan glukosa darah dan hati tikus. Selain itu juga dipelajari sifat fisiko kimia ekstrak lempuyang gajah yang diperoleh dari teknik steam distillation dan ekstraksi dengan pelarut etanol 95%.
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Judul: Potensi Antihiperkolesterolemia Ekstrak Seduhan Teh Herbal Lempuyang Gajah (Zingiber zerumbet L.)
Abstrak: The objective of this research was to study the effectivity of herbal tea compositions of lempuyang gajah as antihypercholesterolemic agent. Extracts were tested in Sprague-Dawley male rats. Forty six rats were divided into four experimental groups as follow: normal, hyperlipidemic, herbal tea extract 1, and herbal tea extract 2. Rats were made hiperlipidemic by oral administration of propil tiouracil (0.5 mg/Kg BW) and high cholesterol feeding (1.5 % cholesterol). Total blood cholesterol concentrations were measured by cholesterol oxidase enzymatic methods of ‘CHOD-PAP’ using spectrophotometer at wavelenght 500 nm. Results showed that cholesterol diet increased blood cholesterol concentration by 76.11 % (p=0.004). Following free cholesterol diet (washed out period), blood cholesterol concentration was decreased by 43.82 % (p=0.101). Similarly, extract 1 reduced cholesterol concentration by 43.20 % (p=0.005). Antihyperlipidemic potency of extract 2 is higher than extract 1 as shown by significant reduction of cholesterol by 51.70 % (p=0.000).
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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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