Judul: Relationship of Various Sago Palm Accessions (Metroxylon spp.) in Lingga District, Kepulauan Riau
Abstrak: Volume impor Indonesia untuk beberapa komoditas pangan seperti gandum dan gula semakin meningkat. Pati sagu dapat digunakan sebagai substitusi tepung gandum serta dapat dijadikan sebagai substitusi gula tebu. Jumlah produksi pati pada tanaman sagu dipengaruhi oleh karakter genetik dan karakter morfologi yang dimiliki. Penelitian ini bertujuan mendapatkan informasi keragaman jenis sagu melalui analisis genetik serta mendapatkan informasi karakter morfologi tanaman sagu di Kabupaten Lingga, Kepulauan Riau. Analisis genetik yang digunakan menggunakan marker RAPD (Random Amplified Polymorphic DNA). Terdapat 9 primer RAPD yang digunakan. Program PCR yang digunakan yaitu pre-denaturasi (5 menit suhu 94 ℃). Selanjutnya tahapan cycle PCR sebanyak 45 cycle yaitu denaturasi (5 detik suhu 94 ℃), annealing (30 detik suhu 42 ℃) dan ekstensi (1 menit suhu 72 ℃). Diakhiri dengan tahapan ekstensi akhir (10 menit suhu 72 ℃). Dilanjutkan proses elektroforesis yang menghasilkan elektroforegram. Data elektroforegram di-skoring berdasarkan ada tidaknya pita DNA polimorfik. Data skoring tersebut kemudian diolah menggunakan program NTSYS untuk memperoleh dendogram kekerabatan sagu. Hasil penelitian menunjukkan bahwa tanaman sagu di Kabupaten Lingga dapat dikelompokkan menjadi tiga kelompok besar, yaitu kelompok I dengan nilai koefisien kemiripan 45%, kelompok II dengan nilai koefisien kemiripan 70% dan kelompok III dengan nilai koefisien kemiripan diatas 70%. Luas anak daun sagu berkisar 597,50–1608,47 cm2. Petiol, anak daun dan midrib pada fase dewasa cenderung memiliki warna hijau, sedangkan pada fase anakan cenderung memiliki warna merah. Karakter morfologi berduri atau tidak berduri pada tanaman sagu tidak dapat dijadikan acuan untuk membedakan suatu individu dengan individu lainnya untuk penamaan sagu., Indonesia's import volume for several food commodities such as wheat and sugar is increasing. Sago starch can be used as a substitute for wheat flour and a substitute for cane sugar. The amount of starch production in sago palm is influenced by genetic characters and morphological characters owned. This study aims to obtain information on the diversity of sago palm species through genetic analysis and obtain information on the morphological characters of sago palm in Lingga Regency, Riau Islands. The genetic analysis used used RAPD (Random Amplified Polymorphic DNA) markers. There are 9 RAPD primers used. The PCR program used is pre-denaturation (5 minutes temperature 94 °C). Furthermore, the PCR cycle stages are 45 cycles, namely denaturation (5 seconds temperature 94 °C), annealing (30 seconds temperature 42 °C) and extension (1 minute temperature 72 °C). Ends with the final extension stage (10 minutes temperature 72 °C). Followed by the electrophoresis process that produces an electrophoregram. Electrophoregram data are scored based on the presence or absence of polymorphic DNA bands. The scoring data is then processed using the NTSYS program to obtain a sago palm resemblance dendogram. The results showed that sago palm in Lingga Regency can be grouped into three major groups, namely group I with a similarity coefficient value of 45%, group II with a similarity coefficient value of 70% and group III with a similarity coefficient value above 70%. The area of sago palm leaves ranges from 597.50–1608.47 cm2. Petiols, leaflets and midrib in the adult phase tend to have a green color, while in the tillering phase tend to have a
Keyword: duri, kemiripan genetik, morfologi daun, penamaan, RAPD, entitle, genetic similarity, leaf morphological, spine

Judul: Identification of Sago Palm (Metroxylon spp.) Accession in Mamuju sub-District, Mamuju District, West Sulawesi Province
Abstrak: Sagu (Metroxylon spp.) merupakan tumbuhan yang berasal dari Indonesia, sekitar 85% sagu dunia terletak di Indonesia. Sagu memiliki potensi yang tinggi, khususnya sebagai tumbuhan pencegah kelaparan. Penelitian ini bertujuan mengidentifikasi aksesi sagu berdasarkan karakter morfologi, produksi, dan genetik di Kecamatan Mamuju, serta kekerabatan sagu di Provinsi Sulawesi Barat menggunakan metode RAPD. Analisis tutupan lahan sagu menggunakan metode pengindraan jauh juga dilakukan untuk mengetahui potensi produksi Kabupaten Mamuju. Terdapat 3 jenis sagu yang terdiri atas 2 jenis tidak berduri, yaitu Kasimpo, dan Kapas, serta 1 jenis berduri yakni Ruwi. Aksesi Kapas menjadi aksesi dengan produksi pati kering tertinggi, dapat mencapai 717,90 kg batang-1. Produktivitas sagu di Kecamatan Mamuju 15,03 ton pati kering ha-1 tahun-1. Produksi pati kering memiliki korelasi terbesar dengan panjang batang (0,872), jumlah daun (0,703), dan diameter batang (0,575). Hubungan kekerabatan (RAPD) berbagai aksesi di Provinsi Sulawesi Barat tidak begitu jauh, dengan nilai Kf <80%. Berdasarkan hasil pengindraan jauh berupa interpretasi citra satelit Pléiades-1A/-B, diketahui luas sagu di kabupaten Mamuju yaitu 252,74 ha. Tutupan lahan sagu terluas terletak di Kecamatan Kalukku yakni 95,27 ha dan tersempit di Kecamatan Kalumpang yaitu 0,91 ha. Peta yang dihasilkan memiliki akurasi sebesar 81,58%., Sago (Metroxylon spp.) is an original plant from Indonesia, about 85% of the world’s sago grown in Indonesia. Sago has a high potential, especially as a prevent hunger plant. The research aims to identify sago accession based on morphology, production and genetic in Mamuju sub-District, and the sago relationship in West Sulawesi Province using RAPD method. Sago land cover analysis using remote sensing method was used to estimate spotential sago production in Mamuju District. There were 3 accession observed, i.e. 2 type non spiny, Kasimpo and Kapas, and 1 type spiny it is Ruwi. Kapas is the hights production dry starch accession, it is reaching 717,90 kg trunk-1. Sago productivity in Mamuju sub-District is 15,03 tons dry starch ha-1 year-1. Dry starch production had the hights correlation with trunk length (0,872), number of leaves (0,703), and trunk diameter (0,575). Relationship (RAPD) various accession sago in West Sulawesi Province was not too far, Kf value <80%. Based on remote sensing with satellite Pléiades-1A/-B imagery interpretation, the sago area in Mamuju District estimated 252,74 ha. The largest sago area is in Kalukku sub-District, which is 95.27 ha and the narrowest is in Kalumpang sub-District, which is 0.91 ha. The map has 81.58% of overall accuracy.
Keyword: genetic, morphology, production, remote sensing, sago types

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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