Judul: Differences Artificial Light Spectrum using Light Emitting Diode on Secondary Metabolite Profiles in Kasturi Mango Seedlings from Tembilahan, Riau.
Abstrak: Artificial irradiation using Light Emitting Diode (LED) in plant cultivation systems has not been widely carried out, especially in fruit tree plants. Environmental modification using LEDs can increase the rate of plant growth and development through plant metabolism in producing secondary metabolites. This study aims to identify the secondary metabolite profiles of mango kasturi (Mangifera casturi Kosterm.) against different types of artificial light (LED) using Gas Chromatography–Mass Spectrometry (GCMS) and Liquid Chromatography-Mass Spectrometry (LCMS) analysis methods. The results of the GCMS analysis obtained 40 secondary metabolites including vitamin E, phytol, and neophytadiene. The results of the LCMS analysis found 5 groups of compounds such as phenylpropanoids, phenanthrenoids, fatty acids, flavonoids, and corrinoids. Further analysis was carried out using multivariate analysis in the form of Venn diagrams, heatmaps clustering analysis (HCA), principal component analysis (PCA), and partial least square discriminant analysis (PLSDA).
Keyword: Gas Chromatography–Mass Spectrometry, Kasturi Mango, Liquid Chromatography-Mass Spectrometry, Multivariat Analysis, Metabolomics

Judul: Karakterisasi Metabolit Sekunder pada Buah Mangga Kasturi (Mangifera casturi) dengan GC-MS (Gas Chromatography-Mass Spectrometry)
Abstrak: Indonesia merupakan negara yang sangat kaya akan keragaman buahnya. Kandungan yang terdapat pada buah-buahan sangat bermanfaat bagi kesehatan manusia. Tujuan dari penelitian ini adalah mengidentifikasi metabolit sekunder yang terdapat pada buah Mangga Kasturi (Mangifera casturi). Penelitian telah dilaksanakan dari bulan Januari hingga bulan April 2020. Penelitian dilakukan di Laboratorium Pascapanen Departemen Agronomi dan Hortikultura, Institut Pertanian Bogor, dan Laboratorium Kesehatan Daerah DKI Jakarta. Pengambilan sampel buah dilakukan di Hulu Sungai Selatan dan Banjar, Kalimantan Selatan. Jumlah mangga Kasturi yang digunakan sebanyak lima jenis yaitu Kasturi, Pinari, Palipisan, Cuban, dan Rawa-rawa yang meliputi aril dan kulit buah. Hasil penelitian menunjukkan bahwa terdapat senyawa-senyawa spesifik pada setiap jenis. Analisis metabolit sekunder dengan GC-MS pada aril mangga Kasturi jenis Kasturi diperoleh senyawa spesifik seperti 13-Tetradecena, Ethyl elaidate, Spinacene, dan (23S)-Ethylcholest-5-en-3.beta.-ol. Jenis Pinari memiliki senyawa spesifik seperti Ethyl E-11-hexadecenoate dan 9,17-Octadecadienal, (Z)-. Jenis Palipisan memiliki senyawa spesifik seperti Ethyl linolenate dan 9-Eicosyne. Jenis Cuban memiliki senyawa spesifik seperti Cis-13-Octadecenoic acid dan Octadecan-1-ol. Jenis Rawa-rawa memiliki senyawa spesifik seperti Tetradecenoic acid dan Cis- Vaccenic acid. Analisis metabolit sekunder dengan GC-MS pada kulit mangga Kasturi jenis Kasturi diperoleh senyawa spesifik seperti Distearyl phosphite dan 13-Octadecenoic acid. Jenis Pinari memiliki senyawa spesifik seperti Ethyl tetradecanoate dan 1-Docosene. Jenis Palipisan memiliki senyawa spesifik seperti 1-Hexadecene, Linolenic acid, dan Octacosyl acetate. Jenis Cuban memiliki senyawa spesifik seperti Cyclotetracosane dan 1-Pentadecene. Jenis Rawa-rawa memiliki senyawa spesifik seperti Docosane dan Triacontyl acetate.
Keyword: buah tropik, endemik Kalimantan Selatan, kromatografi, lupeol, Mangifera casturi

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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