title: Antibiotic resistance in bacteria isolated from freshwater aquacultures and prediction of the persistence and toxicity of antimicrobials in the aquatic environment.
abstract: The occurrence of antibiotic-resistant bacteria isolated from freshwater aquaculture effluents was investigated. The bacterial strains were collected from four different freshwater aquaculture effluents (catfish, trout, eel, and loach). Based on sequence of 16S rRNA, a total of 20 bacterial strains was isolated and one half of the isolated bacteria were Aeromonas sp. The antimicrobial sensitivity test was performed using the disc diffusion method. Individual antibiotic-resistant bacteria to antimicrobials were 41.7% and multiple antibiotic resistant bacteria were 58.3%. The disinfection of antibiotic-resistant bacteria by electron beam (E-beam) irradiation was carried out using an electron accelerator. Antibiotic-resistant bacteria were effectively disinfected by E-beam irradiation. The isolated bacteria were completely disinfected at a dose of less than 2 kGy. The persistence and toxicity of each antimicrobial in the aquatic environment was estimated due to the human health and ecosystems. In order to estimate the persistence and toxicity of antimicrobials in the aquatic environment, two quantitative structure activity relationship (QSAR) models were used. The persistence and toxicity of each antimicrobial were influenced on its hydrophobicity. In addition, QSAR models showed that isoelectric point and hydrogen bonding acceptor are key parameters to estimate the persistence and toxicity of antimicrobials in the aquatic environment.
authors: Research Division for Industry & Environment, Korea Atomic Energy Research Institute, Jeongeup, Republic of Korea.
authors: Seung J
authors: SJ
authors: Lim
authors: Eunhee
authors: E
authors: Jang
authors: Sang-Hun
authors: SH
authors: Lee
authors: Byeong-Hak
authors: BH
authors: Yoo
authors: Sun-Kyoung
authors: SK
authors: Kim
authors: Tak-Hyun
authors: TH
authors: Kim
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000633:toxicity*; D001419:Bacteria / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification* / Q000528:radiation effects; D004203:Disinfection; D024881:Drug Resistance, Bacterial; D005399:Fishes; D005618:Fresh Water / Q000382:microbiology*; D008826:Microbial Sensitivity Tests; D021281:Quantitative Structure-Activity Relationship; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000633:toxicity*
chemical_list: D000900:Anti-Bacterial Agents; D014874:Water Pollutants, Chemical