Abstract
In this research, bottom water samples were collected from nature water. After cultivating and selecting, bacteria which could use (NH4)2SO4 as the only nitrogen source had been selected. The bacteria were cultivated in BM cultures with 0, 0.1, 1, 10, 100 ng/L 17β-estradiol (E2), and the initial concentration of E2 is the only difference between cultures of each group. BM culture is a kind of bacteria culture with 100 mg/L of NH4-N as only nitrogen source. Every group’s N- NH4+, N- NO3-concentration and OD600 were measured. The result shows that compared with the control group, in which no E2 was added, the growth of heterotrophic nitrifying bacteria had been promoted when the concentration of E2 was in range of 1 - 100 ng/L. In addition, heterotrophic nitrifying bacteria’s growing speed has a positive correlation between the E2’s concentration. However, low concentration of E2 (like 0.1 ng/L), could inhibit the growth of heterotrophic nitrifying bacteria. Considering the impact of E2 on heterotrophic nitrifying bacteria, it is necessary to intensify the detection of E2 in the future.
Highlights
Environmental estrogens (EEs) are estrogen analogues, and estrogen-like chemical substances that are distributed in the natural environment and can interfere or harm the endocrine function of the body
The bacteria were cultivated in BM cultures with 0, 0.1, 1, 10, 100 ng/L 17β-estradiol (E2), and the initial concentration of E2 is the only difference between cultures of each group
The result shows that compared with the control group, in which no E2 was added, the growth of heterotrophic nitrifying bacteria had been promoted when the concentration of E2 was in range of 1 - 100 ng/L
Summary
Environmental estrogens (EEs) are estrogen analogues, and estrogen-like chemical substances that are distributed in the natural environment and can interfere or harm the endocrine function of the body. There are reports that the total concentration of estrogen in river water bodies could reach more than 100 ng/L (Zhou et al, 2011). There have been reports in recent years showing that estrogen can have a significant effect on microbes. In this regard 17β-estradiol is studied more environmental estrogen. If the nitrification or proliferation of heterogeneous nitrification bacteria is abnormal, it will have an adverse effect on the nitrogen cycle of natural water bodies. Based on the current situation of this study, this study obtained the heterotrophic nitrifying bacterial flora from natural water bodies, explored the effects of E2 on its growth condition and nitrification, and obtained preliminary results
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