Judul: In vitro Induced Mutation of Anthurium Plants Using Streptomycin Antibiotic
Abstrak: Anthurium dibudidayakan sebagai bunga potong dan juga tanaman hias daun. Telah banyak hibrida dan kultivar Anthurium yang beredar, akan tetapi Anthurium variegata masih jarang ditemukan dan juga memiliki nilai yang tinggi, oleh karena itu perlu dilakukan induksi mutasi untuk memperoleh mutan variegata. Penelitian ini bertujuan mempelajari lama perendaman dan konsentrasi antibiotik streptomycin, serta mendapatkan lethal concentration 50 (LC50) yang sesuai untuk menginduksi mutasi variegata pada Anthurium clarinervium dan Anthurium gracile. Penelitian dilaksanakan pada bulan November 2023 hingga April 2024 di Laboratorium Bioteknologi Tanaman 3, IPB University. Hasil penelitian menunjukkan persentase mutan putatif variegata tertinggi diperoleh pada perlakuan lama perendaman 24 jam dan konsentrasi streptomycin 1000 ppm pada Anthurium clarinervium. Jumlah total mutan putatif variegata pada Anthurium clarinervium adalah sebanyak lima individu, dan pada Anthurium gracile adalah sebanyak 75 individu. Nilai LC50 pada Anthurium clarinervium dengan lama perendaman 24 jam adalah 4233,03 ppm, dan dengan lama perendaman 48 jam adalah 1541,68 ppm. Nilai LC50 pada Anthurium gracile dengan lama perendaman 24 jam adalah 6101,92 ppm., Anthuriums are cultivated as cut flowers and as ornamental foliage. There are many Anthurium hybrids and cultivars, but Anthurium variegata is still rarely found and also has high values. Variegated mutants can be obtained, among others, through mutation induction. This research aims to study the soaking time and concentration of the antibiotic streptomycin, and to determine the appropriate lethal 50 concentration (LC50) to induce variegated mutations in Anthurium clarinervium and Anthurium gracile. The research was carried out from November 2023 to April 2024 at the Plant Biotechnology Laboratory 3, IPB University. The results of the study showed that the highest percentage of variegated putative mutants was obtained in the treatment of 24 hours of immersion and a streptomycin concentration of 1000 ppm on Anthurium clarinervium. The total number of putative variegated mutants in Anthurium clarinervium was five individuals, and in Anthurium gracile there were 75 individuals. The LC50 value for Anthurium clarinervium with a soaking time of 24 hours was 4233,03 ppm, and with a soaking time of 48 hours it was 1541,68 ppm. The LC50 value for Anthurium gracile with a soaking period of 24 hours was 6101,92 ppm.
Keyword: Araceae, chemical mutation, genetic diversity, lethal concentration 50, variegata

Judul: Induksi Keragaman Genetik Tanaman Anthurium Wave Of Love (Anthurium plowmanii Croat.) dengan Radiasi Sinar Gamma Dari 60Co Secara In Vitro
Abstrak: Mutasi yang diinduksi merupakan salah satu cara yang dapat dilakukan untuk meningkatkan keragaman genetik suatu spesies tanaman. Mutasi induksi dapat dikombinasikan dengan kultur in vitro untuk memperbaiki karakter suatu spesies dan memacu meningkatkan keragaman genetik dalam waktu yang lebih singkat. Percobaan ini bertujuan untuk mempelajari dosis radiasi sinar gamma dari 60Co yang tepat untuk menginduksi keragaman genetik tanaman Anthurium Wave of Love dan mendapatkan LD50 tanaman Anthurium Wave of Love (Anthurium plowmanii Croat.) secara in vitro. Bahan tanaman yang diradiasi adalah tunas steril tanaman Anthurium Wave of Love yang telah dikulturkan selama 14 minggu. Media in vitro yang digunakan untuk perbanyakan tunas sebelum radiasi adalah MS + 1 mg/l BAP + 0.1 mg/l IBA + 30 g/l gula + 5 g/l agar, pH 5.9. Subkultur dilakukan dua kali dengan selang waktu 8 minggu. Subkultur I dan subkultur II menggunakan media MS + 2 mg/l BAP + 0.5 mg/l NAA + 30 g/l gula + 5 g/l agar, pH 5.9.
Keyword: 

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: