Judul: Morphology, production, genetic and chemical diversity of sago starch (Metroxylon spp.) in Tana Luwu, South Sulawesi Province
Abstrak: Tana Luwu merupakan sentra komoditas sagu di Provinsi Sulawesi Selatan, namun kajian dan pengembangan sumberdaya sagu belum optimal. Penelitian ini bertujuan untuk mengidentifikasi dan menganalisis keragaman morfologi, produksi, genetik dan kandungan kimia pati sagu di Tana Luwu. Analisis keragaman morfologi dan produksi menggunakan software PBSTAT-EL 2.1. Analisis komponen utama multivariat dan analisis korelasi menggunakan Software Minitab 6. Analisis keragaman genetik menggunakan software DARwin 6.0.21 dan analisis kandungan kimia pati sagu menggunakan analisis ragam. Hasil penelitian menunjukkan bahwa sagu di Tana Luwu terbagi menjadi dua kelompok utama dengan jarak ketidaksamaan morfologi yang tinggi yaitu 0,07-0,93. Rata-rata produksi enam aksesi sagu mencapai 276,40 kg pati kering pohon-1. Aksesi Kapa memiliki produksi tertinggi dengan rata-rata 476,66 kg pati kering pohon-1 dan potensi produksi mencapai 33,24 ton ha-1. Aksesi Kapa, Sabbe, Uso dan Kasimpo dapat digunakan sebagai klon unggul karena menghasilkan >200 kg pati kering batang-1. Parameter tinggi batang sebesar = 0,73 dan jumlah daun r = 0,78 memiliki korelasi kuat terhadap produksi sagu. Produksi sagu memiliki korelasi dengan lingkungan tumbuh yang beragam antara berbagai unsur kualitas tanah dan kondisi hidrologi. Produksi sagu tertinggi sebesar 368,99 kg pati kering pohon-1 ditemukan di daerah aliran sungai (DAS) Makawa yaitu aksesi Kapa, Uso dan Kiduri sedangkan terendah yaitu 181,52 kg pati kering pohon-1 terdapat di rawa pesisir yaitu aksesi Kapa, Kasimpo, Sabbe, Ute dan Kiduri. Penyebaran aksesi Kapa lebih tinggi dibandingkan dengan aksesi lainnya dengan rata-rata sebesar 12,67 rumpun ha-1 sehingga dapat dikembangkan pada lingkungan tumbuh yang beragam. Polimorfisme tertinggi terdapat pada primer OPAB04 dengan nilai 91,67%. Sebanyak 77 profil pita spesifik yang menjadi penciri khusus dari 24 genotipe sagu di Tana Luwu. Ditemukan sebanyak enam kelompok pohon sagu berdasarkan hasil PCoA dan konstruksi pohon filogenetik memiliki koefisien ketidakmiripan yang cukup tinggi yaitu 0,08-0,33. Variabel kadar protein dan kadar abu keenam aksesi telah memenuhi standar SNI 01-3729:2008 sedangkan kadar air dan serat kasar melebihi syarat mutu., Tana Luwu is a center for sago commodities in South Sulawesi Province, but the study and development of sago resources is not optimal. This study aims to identify and analyze the morphological, production, genetic and chemical diversity of sago starch in Tana Luwu. Analysis of morphological and production diversity using PBSTAT-EL 2.1 software. Multivariate principal component analysis and correlation analysis using Minitab 6 software. Genetic diversity analysis using DARwin 6.0.21 software and chemical content analysis of sago starch using analysis of variance. The results showed that sago in Tana Luwu was divided into two main groups with a high morphological dissimilarity distance of 0,07-0,93. The average production of six accessions of sago reached 276,40 kg of tree dry starch-1. Accession Kapa has the highest production with an average of 476,66 kg of dry starch tree-1 and production potential reaches 33,24 tons ha-1. Accessions Kapa, Sabbe, Uso and Kasimpo could be used as superior clones because they produced >200 kg dry starch stem-1. The parameters of stem height = 0,73 and number of leaves r = 0,78 have a strong correlation to sago production. Sago production has a correlation with the growing environment which varies between various elements of soil quality and hydrological
Keyword: Keanekaragaman Morfologi, Produksi, Genetika, Pati, Sagu, Tana Luwu

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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