关键词:
Sulfonamides
Dictyosphaerium
Tolerance
Polysaccharide
Removal
摘要:
Sulfonamides(SAs)are common antimicrobial drugs,which are frequently detected in surface water systems,and are difficult to degrade,posing a potential threat to the aquatic ***,little is known about the potential adverse effects of SAs on nontarget organisms(e.g.,microalgae)in the aquatic *** this study,the effect of SAs(sulfadiazine(SD),sulfamerazine(SM1),and sulfamethazine(SM2)at 1,5,20,and 50 mg/L concentrations,respectively)on the freshwater microalga Dictyosphaerium *** investigated,with respect to changes of biomass and chlorophyll a content and induction of extracellular polymer substances(EPS),including protein and polysaccharide *** the same time,the residue of SAs was *** results showed that Dictyosphaerium *** tolerant to the three SAs,and the chlorophyll a content in Dictyosphaerium *** decreased on day 7,followed by a"compensation phenomena".The increase in protein and polysaccharide contents played a defensive role in Dictyosphaerium *** antibiotic stress,and there was a strong positive correlation between polysaccharide contents and antibiotic *** *** 35%–45%,30%–42%,and 26%–51%removal of SD,SM1,and SM2,*** study is helpful to understand the changes of EPS in the defense process of microalgae under the action of antibiotics,and provides a new insight for the ecological removal of antibiotic pollution in natural surface water system.