Mieta Widya Ramadhani, Faisal and Ahmad Syauqi 2025. Pengaruh Konsentrasi Ekstrak Daun Sirih Hitam (Piper betle var nigra) Terhadap Zona Hambat Bakteri Salmonella typhi dan Escherichia coli : Concentration Effect of Black Betel Leaf Extract (Piper betle var nigra) on the Inhibition Zone of Salmonella typhi and Escherichia coli Bacteria . Jurnal SAINS ALAMI (Known Nature). 8, 1 (Jul. 2025), 56–64. DOI:https://doi.org/10.33474/j.sa.v8i1.18830.