Judul: Penelitian penentuan derajat toksisitas tanaman ciplukan pada hewan percobaan katak dan mencit
Abstrak: Tujuan penelitian adalah menentukan derajat toksisitas tanaman Ciplukan (Physalis minima Linn.) pada hewan percobaan katak dan mencit dengan menentukan LD 50 nya. Berat katak yang dipakai dalam percobaan ini adalah 30-70 gram, sedangkan berat mencit adalah 20-30 gram. Dalam per cobaan ini infus Ciplukan dengan konsentrasi 20% disuntikkan secara subcutan pada katak dan intra-peritoneal pada mencit. Penentuan nilai LD 50 menggunakan Metodą Trevan dan Metoda Karber. Penghitungan menurut cara Trevan menggunakan analisis statistik dengan model persamaan garis sigmoid yaitu y = a + bln x. Pengambilan contoh dilakukan secara acak. Dengan cara Karber, LD 50 dapat langsung dibuat dengan per samaan LD 50 = ab/c. Nilai a adalah dosis terkecil yang dapat menyebabkan kematian tertinggi sekelompok hewan percobaan. Nilai b adalah jumlah hasil kali antara beda dosis dengan interval rata-rata yang mati dan c adalah jum lah populasi dalam sekelompok dosis.
Keyword: 

Judul: Toksisitas Ekstrak Ciplukan (Physalis angulata) Berdasarkan Uji Letalitas Larva Udang
Abstrak: Physalis angulata known as ciplukan in Indonesia is widely used as herbal medicinal plant. Studies on this plant revealed its potency as antidiabetic, antioxidant, antimicrobial, and antiasthma, but the toxicity is not reported yet. This study aimed to determine the toxicity of leaf extracts from ciplukan by using brine shrimp lethality test (BSLT). Phytochemical test of crude ethanolic extract indicated the presence of alkaloids, flavonoids, and steroids. Ethanol crude extract was extracted by liquid-liquid extraction and gave 2 extracts, namely n-hexane and ethyl acetate extracts. BSLT results showed that all the extracts were toxic. n- Hexane extract was the most toxic extract with value of LC50 3 ppm, indicating its potency as anticancer.
Keyword: Bogor Agricultural University (IPB), Physalis angulata, ciplukan, brine shrimp lethality test

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.
Keyword: