Summary
Highlights
The video highlights the significant problem of antibiotic resistance, which caused over 219,000 deaths and 829,000 cases in 2023. This inspired researchers to search for bacteria with antibacterial properties in an unexpected place: a city landfill.
Soil samples were collected from 6-12 inches deep at a landfill, stored at 4°C, and then pre-treated at 55°C for 20 minutes. The samples were air-dried, cultured on specific media with antibiotics to suppress unwanted microbes, and then subjected to sterile dilution and spread techniques to isolate colonies. Morphological characteristics and Gram staining were performed before sending samples for 16S sequencing.
Out of 14 initial isolates, only three grew successfully. These were all Gram-positive, indicated by purple pigmentation. Through 16S sequencing, two species of Bacillus and one Actinomyces were identified. In primary testing, the Actinomyces showed the highest inhibition zone against Bacillus, but no significant inhibition was observed in secondary screening.
While the bacteria show potential against antibiotic resistance, further biochemical and genetic investigation is needed. Future plans include better isolation methods, additional assays, and refined protocols. This study benefits public health officials, the pharmaceutical industry, and future researchers, aligning with SGS3 121 15 and 17, and was conducted with the help of Duke Luna's Development Center.