Judul: Penapisan Actinomycetes Endofit yang Memiliki Aktivitas Anti Fitopatogen Terhadap Phytophthora palmivora dan Phellinus lamoaensis
Abstrak: Actinomycetes is a microorganism which capable of producing antibiotics and antifungal compounds. The purpose of this research is the screening of endophytic Actinomycetes have been isolated from various plant medicines derived from Cirebon, acts as an anti fitopatogen against Phytophthora palmivora and Phellinus lamoaensis. The results showed that isolates a1084 generate intra-cellular compounds that inhibit the activity of Phytophthora palmivora wide clear zone diameter of 23.92 mm. Methanol extract was fractionated using silica gel column chromatography with gradien telutionan dobtain 14 fractions which have inhibitory effects against Phytophthora palmivora and did not have inhibitory effects against Phellinus lamoaensis. Antifungal activity test showed that the fraction of 6.3 from the chromatography column showed the highest activity with wide clear zone diameter of 22.86 mm. Fractionation of the results of subsequent column chromatography using High Performance Liquid Chromatography (HPLC) to determine peak contained in the extract. Based on the resulting chromatogram, secondary metabolit esproducedin the form of polar compounds.
Keyword: antiagains, Actinomycetes, Phellinuslamoaensis, Phytophthorapalmivora

Judul: Penapisan dan Identifikasi Senyawa Antijamur Patogen Phellinus lamaoensis dari Jamur Endofit pada Tanaman Obat Asal Cirebon
Abstrak: Endophyte fungal is a fungi that grows in the plant tissue which capable of producing antibiotics compounds. Intended use of these fungi to produce antifungal compounds that can inhibit the growth of fitopatogen cocoa plants Phellinus lamaoensis. The methods used in this study, among others, active screening isolates with testing activities, using the analytical KLT, analytical HPLC purification , and identification of active compounds using LC-MS. Endophytic fungi isolates used in this study comes from the leaf tissue, flowers and medicinal plants stems from Cirebon. On the leaves of plants bandotan ( ageratum conyzoides l. ) found activity endophyte fungal against pathogenic Phellinus lamaoensis in diameter clear zone with three times reprocability, successive 10.52 mm ,10.37 mm, and 9.8 mm. Fungus that has the activity called Penicillium Lagena. The presence of a compound capable of inhibiting the growth of Phellinus lamaoensis characterized by the presence of two peaks on the results of the analysis of HPLC. The first peaks had a retention time at 10.34 min on 231.8-553.2 nm as the optimal wavelength and the second peaks had a retention time of 12.152 min on 229.5-542 nm. The molecular weight of the first compound was estimated to be 206.0547 gram/mol on Liquid chromatography–mass spectrometry (LC-MS) analysis. These compound was predicted as scoparone, citropten, 4-acetoxycinnamic acid.
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Judul: Simulasi persamaan keadaan bintang dengan pendekatan klasik dan relativistik
Abstrak: Komposisi bintang yang selalu berubah akanmempengaruhi massa dan radius bintang itu sendiri. Dimana semakin tua sebuah bintang, maka bintang akan didominasi oleh unsur-unsur berat. Dengan persamaan politrop dan metode Runge-Kutta orde 4 didapatkan radius dan massa bintang semakin berkurang seiring berkurangnya nilai Ye, sedangkan kerapatan semakin meningkat. Pendekatan terbaik terdapat pada nilai Ye sebesar 0.5 dimana didapatkan bahwa massa bintang katai putih sebesar 1.4Mo sesuai dengan massa Chandrasekhar dengan radius bintang 5000 km dan nilai kerapatan bintang sebesar 5.31x 106 g cm-3. Untuk massa bintang neutron diperoleh nilai 0.05Modan radius bintang sebesar 2300 km, sedangkan kerapatannya bintang neutron diperoleh sebesar 1.84 x 107 g cm-3 dengan menggunakan pendekatan relativistic. Pendekatan relativistic terbukti lebih baik untuk menentukan radius dan massa bintang, dengan pendekatan terbaik pada nilai Ye sebesar 0.5 yaitu pada bintang katai putih
Keyword: Composition of the stars, density of the stars, mass of the stars, radii of the stars