Judul: Characterization of Doubled Haploid  Eggplant (Solanum melongena L.) Lines Obtained from Anther Culture
Abstrak: Pendekatan teknologi dihaploid (doubled haploid/DH) melalui kultur antera berhasil mempersingkat perolehan galur homozigot terhadap komoditas terung (Solanum melongena L.). Penelitian ini bertujuan mengidentifikasi galur-galur dihaploid terung hasil kultur antera yang berpotensi dikembangkan sebagai tetua persilangan hibrida. Penelitian ini mengkarakterisasi 11 galur dihaploid terung dan 3 varietas cek. Pengamatan kuantitatif dan kualitatif dilakukan menggunakan Panduan Pengujian Individu oleh PPVT 2007. Pengolahan data kuantitatif menggunakan analisis ragam dan jika signifikan dilanjutkan dengan uji Tukey BNJ a 5%. Data kualitatif dijelaskan secara deskriptif. Analisis gerombol mengelompokkan genotipe-genotipe berdasarkan kemiripan karakter melalui dendrogram. Hasil penelitian menunjukkan bahwa genotipe uji terung menunjukkan keragaman pada seluruh karakter kuantitatif selain umur akhir panen, serta keragaman karakter kualitatif yaitu tipe tumbuh, lekukan tepi helai daun, warna mahkota bunga, bentuk umum, warna kulit buah saat masak panen, kelengkungan, tambalan, rasio panjang banding diameter, dan bentuk ujung buah. Genotipe terung dikelompokkan menjadi empat gerombol. Pro-AM1, Pro-AM38, dan Hit-AM30 merupakan galur yang potensial sebagai tetua persilangan dengan karakter hasil yang baik., The doubled haploid (DH) technology approach through anther culture succeeded in shortening the production of homozygous lines of eggplant (Solanum melongena L.). This research aimed to identify doubled haploid lines of eggplant obtained from anther culture that have the potential to be developed as parents for hybrids. This study characterized 11 doubled haploid lines of eggplant and 3 check varieties. Quantitative and qualitative observations were carried out using Individual Test Guidelines by PPVT 2007. Quantitative data were analyzed using analysis of variance and if significant it was continued with Tukey’s HSD a 5%. Qualitative data were explained descriptively. Cluster analysis grouped the tested genotypes based on character similarities through a dendrogram. The result of the research showed that doubled haploid eggplant lines varied in all quantitative characters except the end of harvest age, as well as qualitative characteristics namely growth type, curve of leaf edge, color of flower corolla, general shape, color of fruit skin when ripe for harvest, curvature, patch, length to diameter ratio, and fruit tip shape. Eggplant genotypes are divided into four clusters. Pro-AM1, Pro-AM38, dan Hit- AM30 are potential lines as parents for hybrids with good yield characters.
Keyword: cluster analysis, dendrogram, qualitative, quantitative

Judul: Keragaan In Vitro dan In Vivo Hibrida Somatik antara Solanum melongena cv. Dourga dengan Solanum torvum Sw.
Abstrak: Eggplant is the plant which susceptible to several diseases. One attempt to improve these caracters is combining the eggplant cultivar with its wild relatives through protoplast fusion. The research was conducted to study the variability in vitro and in vivo of somatic hybrids between Solanum melongena cv. Dourga with Solanum torvum Sw. This study used seven clones, Solanum melongena cv. Dourga, Solanum torvum Sw., and 5 clones of somatic hybrids (SMST1, SMST2, SMST3, SMST4, and SMST5) was arranged with completely randomized design single factor. The variables measured were plant height, number of leaves, leaf length, petiole length, number of roots, root length, number of stem segment, stem color, petiole color, the number of spines on the leaf surface, and leaf blade lobing. In in vitro conditions, the growth of Solanum torvum Sw. significantly different with the five somatic hybrid clones, with higher vigor. Clones SMST1, SMST2, and SMST4 showed better growth than clone SMST3 and SMST5. In in vivo condition, the clones tested had a similarity with Solanum torvum Sw.
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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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