Antimicrobial Activity of Endemic Herbs from Tangkahan Conservation Forest North Sumatera to Bacteria and Yeast - NURTJAHJA, KIKI; Department of Biology, Faculty of Mathematics and Natural Sciences, Sumatera Utara University, Jalan Bioteknologi No.1, Kampus USU, Medan 20155, Indonesia (Bogor Agricultural University, Indonesia, 2013)