Judul: Keragaman Cendawan Entomopatogen di Taman Nasional Gunung Gede Pangrango, Kawasan Cibodas
Abstrak: Entomopathogenic fungi is fungi which are parasite on insect. These fungi can be used as pest control agents that are environmentally friendly. In Indonesia, their existence and diversity especially Gunung Gede Pangrango National Park (TNGGP) is not well known. This research was conducted to explore their biodiversity in TNGGP. Samples were taken four times, at March 13rd and 28th; April 4th and 21st 2012 with a same season, on two pathways that are have different in heights. They were successfully obtained, identified, and isolated using direct spore method. The result showed that in Cibodas, TNGGP there were five genera of entomopathogenic fungi, namely Hypocrella, Cordyceps, Aschersonia, Gibellula, and Lecanicillium. The first two genera were in teleomorf phase and the others are in anamorf. Successfully isolated specimen is Lecanicillium PR 08
Keyword: 

Judul: Ragam cendawan entomopatogen di kawasan Cagar Alam  Telaga Warna, Cisarua Bogor
Abstrak: Cendawan entomopatogen adalah cendawan parasit serangga. Keberadaan dan keragaman cendawan ini di Indonesia belum banyak diketahui. Penelitian ini bertujuan mengeksplorasi keragaman cendawan entomopatogen yang berada di kawasan Cagar Alam Telaga Warna, Cisarua Bogor. Sampel yang diambil berupa cendawan yang berasosiasi dengan serangga. Pengumpulan sampel dilakukan sepanjang jalur penelusuran kawasan Cagar Alam Telaga Warna. Sampel yang berhasil dikoleksi kemudian diidentifikasi dan diisolasi dengan menggunakan teknik spora tunggal. Cendawan entomopatogen yang diperoleh ialah Cordyceps, Hypocrella, Aschersonia, Beauveria, Gibelulla, dan Isaria. Dua genus yang pertama ditemukan fase teleomorfnya secara alami sedangkan lainnya hanya fase anamorfnya. Spesimen yang berhasil diisolasi, ialah Cordyceps cf. militaris, Isaria RA 19, ? Isaria RA 20 dan Beauveria RA 23.
Keyword: 

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: