Hong-Thih Lai

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In this study, the transformation of sulfonamide antibiotics (SAs, 50 mg L(-1)) was investigated in systems consisting of a fungal laccase (6 IU) and six mediators (1mM). The results illustrate that the laccase had limited effect on the removal of sulfadimethoxine and sulfamonomethoxine. However, laccase oxidation with the mediators (LMS) led to significant(More)
This is the first study to examine the application parameters for oxidation of two sulfonamide antibiotics (SAs), sulfadimethoxine (SDM) and sulfamonomethoxine (SMM), using a novel laccase and mediators. The optimal conditions in the laccase-mediator system (LMS) were pH 4, 50-60 °C, and 1 mM for 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS);(More)
Oxolinic acid (OA) and flumequine (FLU) are two of the quinolone antibiotics (QAs) that are widely used in aquaculture. The purpose of this study was to understand the fates of OA and FLU in waters and sediment slurries from aquaculture ponds in a laboratory experiment. Waters and sediments were sampled from an eel (Anguilla japonica) pond and a shrimp(More)
This study investigated the growth inhibition effects of three phenicol antibiotics on microalgae used in aquaculture. Different dose levels of chloramphenicol (CAP), florfenicol (FF), and thiamphenicol (TAP) were added to cultures of one freshwater green alga, Chlorella pyrenoidosa, and two marine algae, Isochrysis galbana and Tetraselmis chui. For the two(More)
Bacterial adherence to epithelial cells is a key virulence trait of pathogenic bacteria. The type 1 fimbriae and the P-fimbriae of uropathogenic Escherichia coli (UPEC) have both been described to be important for the establishment of urinary tract infections (UTI). To explore the interactions between the host and bacterium responsible for the different(More)
The purpose of this study was to investigate the acute and chronic toxicity of sulfamonomethoxine (SMM) to aquatic organisms to evaluate its impact at different trophic levels in the ecosystem. Regarding the growth inhibition of microalgae, SMM exhibited 72-h median effective concentration (EC50) values of 5.9mgL(-1) for freshwater Chlorella vulgaris and(More)
In this study, the effects of natural, visible and ultraviolet lights, microbial activities and aerobic and anaerobic conditions on degradation of four different sulfonamide antibiotics (SAs) were studied. Water and sediment collected from a marine shrimp pond were examined and a factorial design was employed to evaluate the effects of selected parameters.(More)
Enrofloxacin (ENR) and ciprofloxacin (CIP) are two fluoroquinolone (FQ) antibiotics widely used to treat diseases of human beings and cultured animals. These two FQs are usually detected in the effluent of municipal sewage plants and related aquatic environments. The purpose of this study was to understand the fates of ENR and CIP in aquaculture pond water(More)
The present study established a fast and convenient bioassay method for aqueous ecosystems using the prawn estradiol equivalent concentration (p-EEQ) of male Macrobrachium nipponense, which produce vitellogenin (VTG) after exposure to xeno-estrogens. This method was then used to determine the concentrations of xeno-estrogen pollutants in the rivers of(More)
This study investigated the effects of light (visible light - 5800 lux, 24h) or dark regime and aerobic or anaerobic condition on the decay of added oxolinic acid (OA) at 5, 10 and 20 mg L(-1) in eel pond sediment. An asymptotic decaying exponential model C(t)=C(min)+C(o) × exp (-k × t) was used to facilitate quantitative approach to OA transformation,(More)