Judul: Aktivitas Antibakteri Bunga Nangka Jantan (Artocarpus heterophyllus Lam.) Secara In Vitro
Abstrak: Diare yang disebabkan oleh infeksi bakteri telah diketahui dapat diobati oleh agen antibakteri. Bunga nangka jantan menurut pengalaman empiris masyarakat Temanggung, Jawa Tengah, dapat digunakan untuk meredakan diare. Penelitian ini bertujuan menguji aktivitas antibakteri bunga nangka jantan (Artocarpus heterophyllus Lam.). Prosedur penelitian meliputi uji kadar air, ekstraksi bunga nangka jantan, uji fitokimia, uji aktivitas antibakteri, dan uji konsentrasi hambat tumbuh minimum. Kontrol negatif yang digunakan adalah pelarut metanol, etil asetat, dan n-heksan, sedangkan kontrol positif yang digunakan adalah kloramfenikol. Hasil uji aktivitas antibakteri menunjukkan bahwa ekstrak metanol bunga nangka jantan lebih baik daripada ekstrak etil asetat, dengan rata-rata diameter zona hambat 5 mm terhadap E. coli dan 5.3 mm terhadap S. aureus, berspektrum luas, dan bakterisidal. Konsentrasi hambat tumbuh minimum terdapat pada ekstrak metanol sebesar 3.125 mg mL-1 .
Keyword: Antibacterial, Chloramphenicol, Male flower of jackfruit (Artocarpus heterophyllus Lam.), E. coli, S. aureus, Kloramfenikol, Ekstrak bunga nangka, Aktivitas antibakteri bunga nangka, Konsentrat hambat tumbuh

Judul: Aktivitas senyawa antibakteri akar tumbuhan anting-anting (Acalypha indica L.)
Abstrak: Anting-anting plants had been used by public traditionallly for curing various diseases like dysentry, diarrhea, malaria, and also as antibiotics. The research aimed to study the activity of compounds which had potential as antibactery in plant. The research was conducted activity of antibactery to Gram positif and negatif bacteria with four kinds bacteri are Staphylococus aureus, Bacillus subtilis, Escherichia coli dan Pseudomonas aeruginosa. The roots used were root extract from extraction of hexane solvent, ethyl acetate and methanol. The concentrations used was 200, 150, and 100 mg/ml for each solvents.
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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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