Judul: Identification of Active Compounds in Endophytic Fungi Isolated From Soursop Leaf and Its Potential as Selective Estrogen Receptor Modulators
Abstrak: Kapang endofit daun sirsak memiliki aktivitas antikanker payudara dengan menghambat pertumbuhan sel kanker MCF-7. Sel ini mengekspresikan reseptor estrogen khususnya reseptor estrogen α. Penelitian ini bertujuan mengidentifikasi komponen senyawa aktif kapang endofit daun sirsak dan menentukan potensinya sebagai antikanker payudara melalui penghambatan reseptor estrogen α. Metode penelitian meliputi ekstraksi kapang endofit, identifikasi senyawa aktif dengan LC-MS/MS, dan studi in silico menggunakan reseptor estrogen α. Terdapat 44 senyawa yang berhasil teridentifikasi dengan waktu retensi yang beragam dan sebanyak 15 senyawa berpotensi sebagai antikanker payudara karena kemampuannya dalam menghambat pertumbuhan dan memicu terjadinya apoptosis pada sel kanker. Studi in silico menunjukkan senyawa 3-[(4-hydroxyphenyl)methyl]-octahydropyrrolo[1,2-a]pyrazine-1,4-dione memiliki efek inhibisi terbaik dengan nilai ∆G sebesar -8.3 kkal/mol. Simpulan penelitian ini adanya kemampuan dari ekstrak kapang endofit daun sirsak dalam menghambat reseptor estrogen α, Endophytic fungi isolated from soursop leaves has anticancer activity due to its ability to inhibit the growth of MCF-7 cancer cells. This cell express estrogen receptor, especially estrogen receptor α. This study aimed to identify the active compound in endophytic fungi isolated from soursop leaf and determine the potential as an anticancer of breast cancer through estrogen receptor α inhibition. The method of the research included endophytic fungi extraction, identification of active compound using LC-MS/MS, and in silico study used estrogen receptor α. There are 44 active compounds that are successfully identified with various retention times and 15 compounds has potential as anticancer due to their ability to inhibit the growth and trigger apoptosis in cancer cells. In silico study showed that 3-[(4-hydroxyphenyl)methyl]-octahydropyrrolo[1,2-a]pyrazine-1,4-dione has the best inhibition with ∆G values is -8.3 kcal/mol . The conclusion of this study is the ability of the extract of endophytic fungi isolated from soursop leaf to inhibit estrogen receptors α.
Keyword: breast cancer, endophytic fungi, estrogen receptor, soursop leaves

Judul: Compound Analysis of Phomopsis sp. Fraction from Soursop Leaves as Anticancer and Apoptotic Activity in Breast Cancer Cell MCF-7.
Abstrak: Kanker payudara merupakan salah satu penyakit penyebab kematian yang memerlukan pilihan pengobatan lain dalam penyembuhannya yang memiliki efek samping lebih ringan. Pilihan pengobatan yang dapat dipilih adalah pengobatan herbal. Phomopsis sp. yang berasal dari daun sirsak telah terbukti memiliki aktivitas sitotoksik terhadap sel MCF-7. Penelitian ini bertujuan menganalisis kandungan metabolit fraksi Phomopsis yang berasal dari daun sirsak, aktivitas antiproliferasi, dan apoptosisnya terhadap MCF-7. Metode penelitian ini terdiri dari pemisahan ekstrak Phomopsis sp. dengan metode kromatografi kolom, pengujian sitotoksisitas Brine Shrimp Lethality Test (BSLT), pengujian antiproliferasi terhadap sel kanker payudara MCF-7 dan sel normal Vero, pengujian apoptosis, serta analisis kandungan dengan intrumen LC-MS/MS. Pemisahan dengan kromatografi kolom menghasilkan total 10 fraksi (F1-F10). F1 terpilih menjadi fraksi terbaik dengan nilai LC50 sebesar 2.33 μg/mL dengan metode BSLT. Aktivitas antiproliferasi sel MCF-7 dan sel vero dari F1 menghasilkan nilai IC50 sebesar 5.65 μg/mL dan 5.21 μg/mL secara berurutan. Aktivitas ini teramati melalui mekanisme apoptosis. Terdapat 38 total senyawa yang terkandung dalam F1. Diantara senyawa tersebut, cytosporone c, kynurenic acid, maraniol, (-)-Caryophyllene oxide, dan chalcone teridentifikasi sebagai senyawa yang memiliki aktivitas sebagai antikanker., Breast cancer is one of cause disease of death globally that need other option such as herbal medicine to decrease the side effect. Phomopsis sp. in soursop leaves have proven to have cytotoxicity against cancer cell MCF-7. This study aimed to analyze the metabolite content of Phomopsis sp. fraction, anticancer, also apoptotic activity against breast human cancer (MCF-7) and normal (Vero) cell lines. Phomopsis sp. was separated using column chromatography method. Collected fraction was carried out using Brine Shrimp Lethality Test (BSLT) were the lowest LC50 value was tested against MCF-7, Vero cell lines, and evaluated the apoptotic mechanism with acridine orange-ethidium bromide (AE) dye. Compound identified using Liquid Chromatograph-tandem Mass Spectrometry (LC-MS/MS). Separation using column chromatography resulted in ten fractions (F1-F10). F1 was chosen as the best fraction with LC50 2.33 μg/mL with the BSLT method. F1 then resulted in the antiproliferation method of MCF-7 cell and Vero cell IC50 5.65 μg/mL and 5.21 μg/mL respectively that showed through apoptotic mechanism. A total of 38 active compounds were found in F1. Among the compounds identified, cytosporone c, kynurenic acid, maraniol, (-)-Caryophyllene oxide, and chalcone known as anticancer compounds.
Keyword: Anticancer, apoptosis, breast cancer, Phomopsis sp,, soursop leaves

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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