Judul: Respon Embrio Somatik Bawang Merah Kultivar Ilokos terhadap Polietilen Glikol 6000 dalam Kultur In Vitro
Abstrak: The aims of the experiment was studied the responce somatic embryo to polyethilene glicol 6000 (PEG-6000) as in vitro drought selection agent in Allium ascalonicum L. cultivar Ilokos. The experiment held at tissue culture laboratory, Agronomy and Horticulture Department, Faculty of Agriculture, Bogor Agricultural University, from August to December 2012. Experiment used Completely Randomized Design, single factor of PEG-6000. The factor was concentration of PEG-6000 consisted of 0%, 5%, 10%, and 20%, each treatment repeated 13 times. The results showed that 100% initial explant were induced become embriogenic callus in 2.4-D 2 mg l-1 medium in third weeks after aplication. Good effect was obtained to complete somatic embryo growth from BAP 10 mg l-1 with total number of somatic embrio formed was 454 embryos, but it could not encouraged plant regenaration. Generally, somatic embryos was supposed still survive for two weeks in 5%-20% PEG-6000 selection mediums.
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Judul: Seleksi Kekeringan In Vitro Enam Belas Nomor Tanaman Terung (Solanum melongena. L) dengan Polietilena Glikol (PEG)
Abstrak: The objectives of this study were to study the effect of several concentrations of polyethylene glycol (PEG) on the in vitro growth of eggplant, to find the appropriate PEG concentration for in vitro selection to drought resistance of eggplant and the drought tolerant eggplant accessions. The experiment was conducted at the Laboratory of Tissue Culture, Department of Agronomy and Horticulture, Bogor Agricultural University. The experiment was laid on a completely randomized design with two factor. The first factor was concentration of PEG ( 0, 5, 10, and 15% ) while the second factor was eggplant accessions (Kania F1, 001, 007, 013, 016, 030, 034, 035, 055, 057, 069, 071, 072, 078, 085, and 090 ). The results showed that the addition of PEG to in vitro media significantly affected the survival percentage, the percentage of callus, developed the bud and the number of leaves of eggplant. Addition of PEG 10 and 15% in media can be used as the drought resistance selective agent of eggplant in vitro. Kania F1, 001, 007, 016, 034, 035, 055, 057, 069, 071, 072, 078, 085, and 090 were eggplant accessions which might be tolerant to drought resistance.
Keyword: water deficiency, Bogor Agricultural University (IPB), tolerant, tissue culture, solanaceae, in vitro selection

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf