Judul: Induksi Kalus dan Embrio Somatik Tanaman Jambu Biji Merah (Psidium guajava L.)
Abstrak: The objective of the research was to get the best protocol for callus and somatic embryo induction of guava. The experiment was conducted at Tissue Culture Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University from September 2012 until March 2013. The research was arranged into two experiments, that were callus induction and somatic embryo induction. The results showed that media with plant growth regulator composition treatments R2 (MS + 5 mg l-1 2.4-D), R4 (MS + 5 mg l-1 2.4-D + 1 mg l-1 BAP) and R5 (MS + 2.5 mg l-1 2.4-D + 2 mg l-1 2-iP) were the best treatments for inducting compact callus in 4 weeks after culture (WAC). In while, the friable callus can be induced at media with plant growth regulator composition treatment R6 (MS + 5 mg l-1 2.4-D + 2 mg l-1 2-iP). The primary somatic embryos can be induced at the treatment KR1E4 (callus from MS + 2.5 mg l-1 2.4-D was moved into MS + 1 mg l-1 2.4-D + 2 mg l-1 2-iP) and the treatment KR6E4 (callus from MS + 5 mg l-1 2.4-D + 2 mg l-1 2-iP was moved into MS + 1 mg l-1 2.4-D + 2 mg l-1 2-iP) in 12 and 16 WAC for each treatment.
Keyword: 

Judul: Embriogenesis Somatik Tidak Langsung Jeruk Keprok Batu 55 (Citrus reticulata L) Hasil Perlakuan Kolkisin
Abstrak: This study was aimed to find the best method of regeneration through somatic embryogenesis Mandarin var Batu 55 best as results of in vitro poliploidization by colchicine. This study consists of: the proliferation of callus, maturation of somatic embryo, germination of somatic embryos, elongation of roots and shoots. The best concentration of phytagel for callus proliferation was 2.5 g/l with MS modified Vitamin MW, and 500 mg/l of malt extract. Maturation of somatic embryos with ABA concentration of 0.5 mg/l on MS basic medium, vitamins MW, 100 mg/l malt extract was the best medium to produce cotyledons. MS modified by the addition of vitamin MS + 2.5 mg/l GA3 + 500 mg/l malt extract was the best medium for the formation of plantlets with a percentage of 43%. Elongation of roots and shoots can use MS medium with vitamins MS + IBA 0.5 mg/l + 500 mg/l malt extract to get the best results.
Keyword: Bogor Agricultural University (IPB), vitamin, protein, plant growth regulator, malt extract

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: