Judul: Isolasi dan seleksi mikrob tanah yang menguntungkan serta pengaruhnya terhadap tanaman caisin (Brassica parachinensis)
Abstrak: Indonesia has soil that is very potential to be explored its microbe. Unfortunately the researchs in regards to the total, type, and the diversity of soil microbe are still rare. Hence the major part of soil miciobe is beneficial to the plant growth and it is required in the sustainability of nutrient cycling process in the nature. LnocuIation of soil microbe is expected to assist enhancing the availability of soiI organic matter and at the end will improve plant growth. This research was aimed to get the best microbe isolates and to study their impact on the growing of caisin plant (Brnssicn pnvnchirzensis). Soil samples for microbe isolation were taken fiom two locations namely Cugenaltg and Cikabayan. There were ten best isolates namely: two isolates of phosphate solubilizing bacteria (BF63 and BF223), two isolates of phosphate solubilizing fungi fFF23 and FF51), two isolates of Pseudomonas (P83 and PI 13), and four isolates of ceIlulose degradation microbe (S31, $33, S52, and S133). All of the ten isolates plus one comparison isolate and co~~txoaft the end were inoculated to the caisin plant. This resemch used Con~plete Random Design (RAL) with 24 treatrneilts, substantially microbe treatment with the full fertilizer dosage and microbe treatment with half fertilizer dosage. The entire treatments were repeated thee times so these were 72 experimental units.
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Judul: Isolasi dan Seleksi Bakteri Berpotensi Sebagai Pemicu Pertumbuhan Tanaman
Abstrak: This study aims to collect bacterial isolates potentially such as; solubilizing bacterial phosphate, cellulose decomposer, and N2 fixer (Azospirillum). Stages of research include the isolation and purification; Selection BPF (qualitative test, quantitative), CPM (cellulolytic index), Azospirillum (Kjeldahl method); bacterial testing (hypersensitivity test, hemolytic test, bacterial antagonism test). The results showed that the best BPF isolates with the biggest IP and the P-value was BPF3.2.1 and BPF2.1.1 isolates. The best isolates of best CPM in producing cellulose with highest is value was BPS2.1.1 and BPS3.5 isolates. The best Azospirillum isolates which able to fix N2 was AZ3.2 and AZ2.4 isolates. Isolates BPS3.5 BPF2.1.1 and AZ3.2 indicated to show have antagonistic when were grow in the same plate . All isolates were not pathogenic to plants. However, isolates AZ3.2 and BPS2.1.1 potentially pathogenic to animals.
Keyword: Bogor Agricultural University (IPB), patogenitas, BPS, BPF, Azospirillum, antagonistic

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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