BIOTRANSFORMATION OF CINCHONA ALKALOID COMPOUNDS BY MOLD Xylaria sp.TO CINCHONA N-OXIDE ALKALOIDS [Studies on Endophytic Microbes of Cinchona spp. plants (5)] - Simanjuntak, Partomuan; Biotechnology Center Science Institute of Indonesia Jalan Raya Bogor Km 46 Cibinong 16911 (Faculty of Pharmacy Universitas Gadjah Mada, Yogyakarta, Skip Utara, 55281, Indonesia, 2005)