Judul: Adaptasi dan ketenggangan genotipe padi terhadap defisiensi fosfor di tanah sawah
Abstrak: Defisiensi hara fesfor adalah salah satu kendala produksi padi sawah di Indonesia yang meliputi luas sekitar 1,27 juta hektar. Penggunaan genotipe atau varietas yang tenggang terhadap defisiensi hara ini merupakan salah satu pendekatan yang dapat digunakan dalam penanggulangan kendala tersebut. Perakitan varietas tenggang dan berdayahasil tinggi memerlukan identifikasi tetua yang memiliki sifat tenggang. Pengetahuan tentang mekanisme ketenggangan atau karakter yang berhubungan dengan ketenggangan akan sangat membantu dalam penapisan genotipe untuk mendapatkan tetua tenggang. Suatu penelitian yang terdiri dari satu percobaan Japang (pada sawah defisien P) dan empat percobaan rumah kaca menggunakan medium larutan hara telah dilaksanakao untuk mengevaluasi keragaman ketenggangan genotipe padi terhadap P rendah dan untuk mengidentifikasi genotipe-genotipe yang tenggang dan karakter yang berkaitan dengan ketenggangan, dan mempelajari mekanisme adaptasi ketenggangan padi terhadap defisiensi P. HasH penelitian menunjukkan terdapat keragaman ketenggangan terhadap P rendah di antara plasmanutfah (120 genotipe) yang diuji. Sejumlah 14 genotipe sangat tenggang berdasarkan bobot kering tajuk relatif dan 28 genotipe berdasarkan jumlah anakan relatif berhasil diidentiftkasi. Genotipe tenggang terhadap P rendah di lapang menunjukkan kemampuan penyerapan dan penggunaan internal hara P pada kondisi P rendah yang Iebih tinggi dibanding genotipe peka.
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Judul: Amplifikasi gen pup1 dan uji morfologi perakaran tanaman padi pada kondisi defisiensi fosfor
Abstrak: About 25% of Indonesia's land conditions has phosphorus deficiency. Its makes rice plants in Indonesia deficient of phosphorus. Genes mapping are adrift with P deficiency on chromosome 12 at the gene Pup1 rice. This research has been conducted on gene amplification of BC2F6 Pup1 on rice lines from backcross between Batur and Situ Bagendit with Kasalath and NIL-C443. The root morphology has been done observe the effectiveness of the cross. Root morphology test results by using a solution of Yoshida with 4 different treatment (0.5 P, 10 P, 0.5 P+45 ppm Al. dan 10 P+ 45 ppm Al). The results are tested by ANOVA test and Dunnet test. Based on the results of molecular analysis using primers K29-1 shows the overall results of crossbreeding plants have similarities with elders Kasalath and NIL-C443 as Pup1 donor. The ANOVA test and Dunnet’s results indicate the presence of root morphological differences between plants from crosses with P deficiency intolerant inheritence, Batur and Situ Bagendit.
Keyword: root morfology, gene Pup1, phosphor deficiency, NIL-C443, Kasalath

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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