Antioxidant activity of secondary metabolites of toba frankincense leaves (STYRAX Paralleoncomud PERK) by DPPH radical as scavenging
Sitorus, Marham, Silaban, Ramlan, Silaban, Cory Sisilia
The development of project-based learning resources to build higher order thinking skills in teaching isolation and purification of alkaloid compounds
Sinaga, Ester Hartina Ria, Situmorang, Manihar, Sitorus, Marham