Judul: Studi Biodiversitas Fungi Mikoriza Arbuskula pada Tumbuhan Bawah di Tegakan Sengon (Falcataria moluccana (Miq.) Barneby & Grimes) (Studi Kasus di Areal Kampus IPB Darmaga, Bogor)
Abstrak: Undergrowth plant is one of potencies in forestry field. One of potencies obtained from the undergrowth is the presence of undergrowth that could be used as medicine. Most of these plants are under symbiosis with microorganisms such as arbuscular mycorrhizal fungi. This study examined the status of arbuscular mycorrhizal fungi on undergrowth and the plants that has drug potency. The results showed that the genus of Glomus, Acaulospora and Gigaspora colonized with 50 species, 37 species and 14 species of undergrowth. Among these various plants, there were 25 undergrowth that had the potency of medicinal plants that were capable of having symbiosis with arbuscular mycorrhizal fungi of Glomus, Acaulospora and Gigaspora types.
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Judul: eanekaragaman Fungi Mikoriza Arbuskula (FMA) di bawah Tegakan Tanaman Jabon (Anthocephalus cadamba Miq.) di Pemalang Jawa Tengah
Abstrak: Mycorrhiza is a form of symbiosis mutualism between fungi and the roots of plants. Arbuscular mycorrhizal fungi (AMF) has some functions, one of them is increasing nutrients absorption, especially P. The sample of root and soil used in this research taken from a stand of jabon plants in Pemalang, at the coastal and mountainous area. Observation colonization on plant roots carried out through staining roots and isolation of spores from soil samples is done by using the wet sieving and decanting method. Spores were identified by looking at the spores reaction after etched with a Melzer solution. The result of the research show that the biggest average of root colonization, is found at PML 2.2 is 73.33%. Where as the lowest average of root colonization is found at PML 2.5, is 46.89. In this research is found 3 type of Genus that is Glomus, Acaulospora and Scutellospora. Glomus is the most dominant and are found in all location. The highest density of spores population is at PNK 1. The growth of plants in a coastal area better than a mountainous region.
Keyword: spore density, diversity, colonization, arbuscular mycorrhizal fungi

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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