Oktavia, S., Bahar , M., Wahyuningsih, S., Zulfa , F. and Makkiyah, F.A. 2024. Antibacterial Activity of Graptophyllum pictum (L.) Griff Extract using Variations of Ultrasonic Frequency against Escherichia coli. BIOEDUSCIENCE. 8, 2 (Aug. 2024), 154–150. DOI:https://doi.org/10.22236/jbes/14168.