Antimicrobial Activity Test of Alkaloid Rich Extract from Morinda citrifolia Leaves Against the Growth of Pathogenic Bacteria Staphylococcus aureus and Escherichia coli. - Alexander, Irving Josafat; Surbakti, Mariana; Sirait, Gloria; Silaban, Ramlan (EduMatSains Jurnal Pendidikan Matematika dan Sains, 2026)