ISOLATION OF ANTHOCYANIDIN FROM WORA-WARI FLOWERS (Hibiscus rosa sinensis L.) AND ITS APPLICATION AS INDICATORS OF ACID-BASE

by Siti Nuryanti, Indarini Dwi Puspitasari, Ratman Ratman
Published 2013-11-01

The implementation of guided inquiry learning model to enhance students’ critical thinking skills on reaction rate topic: the case of an Indonesian public school

by Efi Pujianti Puspita Dewi, Ratman Ratman, Kasmudin Mustapa
Published 2020-12-01