Judul: Keanekaragaman Fungi Mikoriza Arbuskula di bawah Tegakan Tanaman Agroforestri Jabon (Anthocephalus cadamba Miq.) di Purwakarta, Jawa Barat
Abstrak: Anthocephalus cadamba is a one of tree species from Rubiaceae family that may symbiotic with arbuscular mycorrhizal fungi (AMF). The presence of AMF is very important for the soil nutrient existence, such as P, K, Mg, Fe, and also Mn to increase the growth of plants. The purpose of this research is to identify the diversity of AMF spores under stand of jabon agroforestry plants and to analyze the AMF status on various jabon planting patterns. Spores isolation was taken from soil sample using wet sieving method and decanthing method. Spores from the isolation morfologically identified by observing spores reaction through Melzer’s liquid. The result of this research indicated that soil chemical characteristic on three planting patterns of jabon do not give any concrete effects to the percentage of AMF’s root colonization. There are three genus of AMF found on the research location consist of Glomus sp., Acalauspora sp., and Scutellospora sp. Based on statistical analysis result, the jabon intercropping planting patterns which combining cucumber plants resulting the highest value of both diameter and height growth on various jabon planting patterns.
Keyword: root colonization, planting pattern, arbuscular mycorrhizal fungi

Judul: Studi Keanekaragaman Genus Fungi Mikoriza Arbuskula di Sekitar Perakaran Pohon Jabon (Anthocephalus cadamba Robx Miq.) Alami
Abstrak: Mycorrhiza is a mutualism symbiotic between fungi with high levels of plant roots, one of the soil fungi that has a high rate of spread is AMF. Many studies that discussed the use of AMF to increase plant growth, such as jabon.However the research that related of AMF diversity on jabon plant also needs to be done. This research is done by AMF trapping, firstly AMF trapping is taken from various location of soil smpel in Indonesia. After that one, isolation, characterization, and identification spores that have been found in Forest Biotechnology Laboratory PPSHB IPB, and Soil Microbiology Laboratory Research and Development Center of Forest Resources Bogor. AMF genus are found around the jabon roots namely Glomus, Acaulospora, Gigaspora and Scutellospora. Genus that dominated is the genus Glomus. The efective host plant for AMF trapping is Sorgum bicolor, because the Sorgum bicolor has roots that are more responsive than Pueraria javanica
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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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