Judul: Response of physiological characters and latex production to ethylene stimulation on several rubber tree clones
Abstrak: Penelitian bertujuan untuk mengetahui variasi musiman karakter fisiologi tanaman karet akibat pemberian etepon, dan hubungan antar karakter fisiologi dengan produksi lateks. Penelitian dilaksanakan di Bogor, Jawa Barat (250 m dpl) mulai September 1997 hingga Desember 1998. Percobaan dalam dua faktor perlakuan, yaitu delapan klon karet (AVROS 2037, BPM 24, PR 261, RRIM 712, GT 1, BPM 1, PR 228, dan LCB 1320) dan tiga sistem eksploitasi (& = '/z S d/2, El = '/z S d/3.ET2.5%, E2 = '/z S d/3.ETS.O%). Peubah yang diamati adalah produksi lateks, indeks penyumbatan, kadar karet kering, %-KAS, pH lateks, kadar sukrosa, kadar fosfat anorganik, kadar tiol, aktivitas SOD, produksi etilen, kadar ACC, aktivitas ACC-oksidase; dan protein dalam fraksi serum-C dan lutoid Hasil penelitian menunjukkan bahwa perlakuan stimulasi meningkatkan produksi lateks pada empat klon (PR 261, BPM 24, PR 228, dan AVROS 2037).
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Judul: Expression Gene of ACC Oksidase effect of Etilena Eksogen and Tapping at Hevea brasiliensis Clone of PB 260.
Abstrak: High request of natural rubber on the world have made researcher to do increase natural rubber product and also look for or yield good clones holding to disease and have high production. This research used clone PB 260 coming from result of cross of primary clone and secondary clone. This clone have fastly of high latex metabolism but less responsive to stimulan. Effort to increase natural rubber product with treatment of tapping and usage of etephon stimulan. Etephon is compound 2-chloro-ethylposphonic acid (CEPA) as incentive or stimulant to increase produce hormone of ethilene endogen at rubber crop. Gene of HbACO1 will be test its expression of etefon and influence of tapping at bark and latex of rubber crop. This research aim to study gene expression of HbACO1 to influence of tapping and giving stimulant at various phase growth of crop. Result of research show gene of HbACO1 only have expression at bark of rubber crop not in latex. Treatment which good to bark of rubber crop is 2 day once tapping and 3 times in one year giving stimulant.
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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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