Judul: Efek Infusa Serai Dapur (Cymbopogon citratus) pada Kadar Glukosa dan Asam Urat Darah Tikus
Abstrak: Serai dapur (Cymbopogon citratus) merupakan salah satu tanaman rempah yang memiliki manfaat sebagai herbal. Serai dapur memiliki kandungan fitokimia berupa flavonoid, alkaloid, tanin, terpen, fenolik, antosianin, steroid, saponin, isoflavon, kumarin, lignin, katekin, isokatekin, dan asam askorbat. Penelitian ini bertujuan untuk melihat pengaruh pemberian infusa serai dapur (Cymbopogan citratus) 20% dan 80% terhadap kadar glukosa dan asam urat darah pada tikus. Sebanyak 30 ekor tikus jantan dibagi menjadi 3 kelompok yaitu kontrol, infusa serai 20%, dan infusa serai 80%. Sampel darah dikoleksi dari ekor kemudian dianalisa kadar glukosa dan asam urat menggunakan test meter (Easy Touch). Rataan kadar glukosa darah menunjukkan hasil yang bervariasi pada ketiga kelompok. Rataan kadar asam urat menunjukkan kecenderungan terjadinya penurunan pada ketiga kelompok. Penurunan kadar asam urat yang paling besar terlihat pada kelompok infusa serai 20%. Pemberian infusa serai dapur pada tikus menunjukkan kadar glukosa darah yang berfluktuasi dan berpotensi menurunkan kadar asam urat dalam darah., Kitchen lemongrass (Cymbopogon citratus) is one of the spice plants that has benefits as herbs. Lemongrass contains phytochemicals such as flavonoids, alkaloids, tannins, terpenes, phenolics, anthocyanins, steroids, saponins, isoflavones, coumarins, lignin, catechins, isocatechins, and ascorbic acid. This study aims to see the effect of giving 20% and 80% infusion of kitchen lemongrass (Cymbopogan citratus) on blood glucose and uric acid levels in rats. A total of 30 male rats were divided into 3 groups: control, 20% lemongrass infusa, and 80% lemongrass infusa. Blood samples were collected from the tail and then analyzed for glucose and uric acid levels using a test meter (Easy Touch). Mean blood glucose levels showed varying results in the three groups. Average uric acid levels showed a tendency to decrease in all three groups. The greatest decrease in uric acid levels was seen in the 20% lemongrass infusa group. Giving lemongrass infusion to rats shows fluctuating blood glucose levels and has the potential to reduce uric acid levels in the blood.
Keyword: asam urat, Glukosa, infusa, tikus, Cymbopogon citratus

Judul: Efek Infusa Serai Dapur (Cymbopogon citratus) pada Kadar Glukosa dan Asam Urat Darah Tikus
Abstrak: Serai dapur (Cymbopogon citratus) merupakan salah satu tanaman rempah yang memiliki manfaat sebagai herbal. Serai dapur memiliki kandungan fitokimia berupa flavonoid, alkaloid, tanin, terpen, fenolik, antosianin, steroid, saponin, isoflavon, kumarin, lignin, katekin, isokatekin, dan asam askorbat. Penelitian ini bertujuan untuk melihat pengaruh pemberian infusa serai dapur (Cymbopogan citratus) 20% dan 80% terhadap kadar glukosa dan asam urat darah pada tikus. Sebanyak 30 ekor tikus jantan dibagi menjadi 3 kelompok yaitu kontrol, infusa serai 20%, dan infusa serai 80%. Sampel darah dikoleksi dari ekor kemudian dianalisa kadar glukosa dan asam urat menggunakan test meter (Easy Touch). Rataan kadar glukosa darah menunjukkan hasil yang bervariasi pada ketiga kelompok. Rataan kadar asam urat menunjukkan kecenderungan terjadinya penurunan pada ketiga kelompok. Penurunan kadar asam urat yang paling besar terlihat pada kelompok infusa serai 20%. Pemberian infusa serai dapur pada tikus menunjukkan kadar glukosa darah yang berfluktuasi dan berpotensi menurunkan kadar asam urat dalam darah., Kitchen lemongrass (Cymbopogon citratus) is one of the spice plants that has benefits as herbs. Lemongrass contains phytochemicals such as flavonoids, alkaloids, tannins, terpenes, phenolics, anthocyanins, steroids, saponins, isoflavones, coumarins, lignin, catechins, isocatechins, and ascorbic acid. This study aims to see the effect of giving 20% and 80% infusion of kitchen lemongrass (Cymbopogan citratus) on blood glucose and uric acid levels in rats. A total of 30 male rats were divided into 3 groups: control, 20% lemongrass infusa, and 80% lemongrass infusa. Blood samples were collected from the tail and then analyzed for glucose and uric acid levels using a test meter (Easy Touch). Mean blood glucose levels showed varying results in the three groups. Average uric acid levels showed a tendency to decrease in all three groups. The greatest decrease in uric acid levels was seen in the 20% lemongrass infusa group. Giving lemongrass infusion to rats shows fluctuating blood glucose levels and has the potential to reduce uric acid levels in the blood.
Keyword: asam urat, Glukosa, infusa, tikus, Cymbopogon citratus

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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