title: Antibiotic response and plasmid profile of bacteria isolated from a landfill.
abstract: Bacteria isolates belonging to the genera Bacillus, Corynebacterium, Aeromonas, and Enterobacter were isolated from a municipal waste landfill in Durham, NC. Bacterial counts obtained with three general purpose media were log(10) colony-forming units (cfu)/g of 9.30, 9. 26, and 9.20 respectively for Plate Count Agar, Brain Heart Infusion Agar, and Nutrient Agar. Coliform count from MacConkey agar was log(10) 7.28/g sample. Isolates were generally sensitive to tetracycline and chloramphenicol (13 of 14 isolates) and generally resistant to ampicillin (9 of 9), erythromycin (10 of 14), streptomycin (8 of 14), with 3 of 14 isolates having multiple resistance to the last three antibiotics. A dose-independent growth response to ampicillin was observed for two isolates. The detection of a 22,000-bp plasmid in one but not in the second ampicillin-resistant isolate suggests more than one mechanism of antibiotic resistance.
authors.affiliation: Department of Biology, North Carolina Central University, Durham, NC 27707, USA.
authors.forename: V C
authors.initials: VC
authors.lastname: Nwosu
authors.forename: J A
authors.initials: JA
authors.lastname: Ladapo
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification*; D015169:Colony Count, Microbial; D004262:DNA Restriction Enzymes / Q000378:metabolism; D004352:Drug Resistance, Microbial; D008826:Microbial Sensitivity Tests; D010957:Plasmids; D012037:Refuse Disposal
chemical_list: D000900:Anti-Bacterial Agents; D004262:DNA Restriction Enzymes