Judul: Keragaman fusarium spp. pada semai pinus merkusii Jungh. Et De Vriese
Abstrak: Penelitian dengan tujuan untuk mengetahui keragaman spesies Fusarium spp. serta peranannya pada semai pinus dengan mempelajari patogenisitasnya dan penggolongan F. oxysporum berdasarkan kompatibilitas vegetatifnya (Vegetative Compatibility Group)serta mempelajari hubungan antara penggolongan F. oxysporum berdasarkan VCG dengan tingkat patogenisitasnya telah dilakuakn pada bulan Agustus 2002 sampai April 2003. Penelitian dilaksanakan di Laboratorium Bioteknologi Kehutanan (Ektomikoriza) Pusat Penelitian Bioteknologi IPB danLaboratorium Mikologi Tumbuhan, Jurusan Hama dan Penyakit Tumbuhan Fakultas Pertanian IPB dan di Kebun Percobaan Taman Pagelaran Bogor.
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Judul: Eksplorasi dan Uji Patogenisitas Fusarium spp. Asal Rizosfer Kelapa Sawit di Kebun Percobaan Cikabayan, Bogor, Jawa Barat.
Abstrak: Oil palm is a major global agricultural commodity and being used in a large number of food and nonfood products. One of the most important problems in oil palm cultivation is plant diseases that attack oil palms. One disease problem occurs at Cikabayan experimental field that attacks young oil palm. The symptoms are frond bending and at the same time necrotic on the leaflets of oil palms. The aim of this research was to identify the fungal pathogen(s) that causing the disease symptoms shown at Cikabayan experimental field. Twenty isolates of Fusarium spp. have been isolated from oil palm’s rizosphere and have identified as Fusarium oxysporum (morphotype a and b) and Fusarium solani. Nine isolates are F. oxysporum morphotype a, three isolates F. oxysporum morphotype b, and eight isolates are F. solani. On pathogenicity test of isolates Fusarium spp., 14 isolates were causing diseased plants and 6 isolates were not. The highest percentation of disease incidence were caused by F. oxysporum morphotype b isolate H2B at level 55% of diseases incidence.
Keyword: Fusarium oxysporum, Fusarium solani, fusarium wilt, nonpathogenic fusarium

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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