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Mieta Widya Ramadhani; Faisal; Ahmad Syauqi. 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. J.KnownNat. 2025, 8, 56-64.