Judul: Adaptation of taro (Colacasia esculenta (L.) Schoot) at different soil water availability
Abstrak: Indonesia is one of the countries with the greatest diversity of taro variety, while the study of taro's morphology and nutritional characteristics is limited. The aim of this study was to evaluate the anatomical of plant and nutritional value of taro tuber. This research observed fourteen genotypes of Colacasia esculenta (7 Eddoe types, 7 Dasheen types) and 3 Xanthosoma genotypes. In three blocks of replications, the eddoe and Xanthosoma genotypes were cultivated using cormel and the dasheen genotypes with sucker. Plant anatomy (leaf, stem, and root) and tuber nutritional characteristics were analyzed. From this research, explained that stomata and epidermis number, length from stomata and epidermis, number leaf epidermis, length of leaf and stem epidermis, also length of root epidermis, endodermis, cortex, and stele among 17 genotypes of taro were statistically different. The diversity of taro based on the nutrition content of tuber between 17 genotypes of taro was considered high, as represented by water, ash, fat, protein, carbohydrate, energy, and glucomannan, which were statistically different.
Keyword: keragaman, perubahan iklim, TALAS; CEKAMAN. AIR, KEKERINGAN, GENANGAN, TALAS, AIR

Judul: Metabolomics Analysis of Taro (Colocasia esculenta L.) Accessions Grown in Different Water Level
Abstrak: Talas merupakan tanaman amfibi yang mampu ditanam pada lahan kering dan basah. Mekanisme pertahanan tanaman pada kondisi cekaman yaitu dengan menghasilkan senyawa metabolit sekunder. Penelitian ini bertujuan untuk mengidentifikasi senyawa metabolit sekunder aksesi talas pada kondisi budidaya air yang berbeda. Penelitian dilakukan dengan perlakuan varietas Satoimo (V1), Jepang hijau (V2), Pratama (V3), Ketan (V4), dan Kuning (V5) dan perlakuan air kapasitas lapang 60% (A1), 80% (A2), 100% (A3), 120% (A4), dan 140% (A5). Hasil penelitian menunjukkan perlakuan air tidak berpengaruh nyata terhadap parameter vegetatif tanaman talas. Perlakuan varietas memberikan pengaruh nyata terhadap parameter vegetatif tanaman talas. Hasil analisis GCMS terhadap umbi talas kondisi kering dan genangan diperoleh 108 senyawa metabolit. Golongan senyawa metabolit sekunder yang teridentifikasi diantaranya asam lemak, alkaloid, poliketida, monoterpenoid, triterpenoid, fenolik, seskuiterpen, steroid, benzenoid, kuinon, dan metanol. Senyawa metabolit sekunder pada kondisi kering lebih tinggi dibanding kondisi genangan., Taro is an amphibian plant that can be grown on dry and wet land. The defense mechanism of plants under stress conditions is to produce secondary metabolites. This study aims to identify secondary metabolites of taro accessions under different water treatment. The research was conducted with the treatment varieties of Satoimo (V1), Jepang hijau (V2), Pratama (V3), Ketan (V4), and Kuning (V5) and field capacity water treatment of 60% (A1), 80% (A2), 100% (A3), 120% (A4), and 140% (A5). The results showed that water treatment had no significant effect on the vegetative parameters of taro plants. Varietal treatment had a significant effect on the vegetative parameters of taro plants. The results of the GCMS analysis of taro tubers in dry and flooded conditions revealed 108 metabolite compounds. The identified secondary metabolites included fatty acids, alkaloids, polyketides, monoterpenoids, triterpenoids, phenolics, sesquiterpenes, steroids, benzenoids, quinones, and methanol. Secondary metabolite compounds in dry conditions were higher than in flooded conditions.
Keyword: Field capacity, gcms, heatmap, secondary metabolites, taro tubers

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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