Antibiotic Response and Plasmid Profile of Bacteria Isolated from a Landfill |
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Authors: | Veronica C Nwosu Jonathan A Ladapo |
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Institution: | (1) Department of Biology, North Carolina Central University, Durham, NC 27707, USA , US |
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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
log10 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 log10 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.
Received: 23 March 1999 / Accepted: 6 July 1999 |
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