title: Effects of 17β-estradiol pollution on water microbial methane oxidation activity.
abstract: 17β-estradiol (17β-E2), a widespread and natural estrogen in the environment, has imposed a serious threat to the safety and function of aquatic ecosystems because of worsening pollution and high potential toxicity. In the present study, the authors focus on the impact of 17β-E2 pollution on water microbial methane oxidation function. The authors investigated the mechanism of its influence on water microbial activity and discuss the growth rate of methane-oxidizing bacteria. The results showed that 17β-E2 could significantly inhibit the function of water microbial methane oxidation. When 17β-E2 concentration was ≥ 5 ng L(-1) , the methane oxidation rate increased with increasing 17β-E2 and finally settled to a constant value. Furthermore, the authors found no significant linear correlation between 17β-E2 concentrations and its methane oxidation rate. However, increasing 17β-E2 dramatically improved water microbial community activity, because a significant or highly significant promotion in the generation rate of CO2 was measured. Moreover, within a certain period of time and at certain concentrations, positive linear correlation existed between water CO2 generation rate and 17β-E2 concentrations. In addition, the growth rate of culturable methane-oxidizing bacteria was promoted when 17β-E2 pollution concentration from 2 ng L(-1) to 20 ng L(-1) . Therefore, 17β-E2 pollution can inhibit microbial methane oxidation function in water, which indirectly promotes the release of water methane and directly contributes to the rate of water-generated and released CO2 . Specifically, 17β-E2 pollution can promote water emissions of greenhouse gases. Environ
authors.affiliation: State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering, Hohai University, Nanjing, China.
authors.forename: Aidong
authors.initials: A
authors.lastname: Ruan
authors.forename: Fengjiao
authors.initials: F
authors.lastname: Zong
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhao
authors.forename: Chenxiao
authors.initials: C
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D002245:Carbon Dioxide / Q000378:metabolism; D002681:China; D004958:Estradiol / Q000633:toxicity*; D004967:Estrogens / Q000633:toxicity*; D019015:Geologic Sediments / Q000382:microbiology; D008697:Methane / Q000378:metabolism*; D010084:Oxidation-Reduction; D045483:Rivers; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D014876:Water Pollution / Q000009:adverse effects
chemical_list: D004967:Estrogens; D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide; D004958:Estradiol; D008697:Methane
keywords: 17β-estradiol; Carbon dioxide; Methane; Methane oxidation function; Methane-oxidizing bacteria