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981.
Bisphenol A, a plastic monomer and plasticizer, is a well-known endocrine disrupter, widely present in the aquatic environment, but little is known regarding its neurotoxicity in fish. Herein, we investigated its effects on male zebrafish brain. Zebrafish were exposed to 10 µg/L BPA for 45 days. An isobaric tags for relative and absolute quantitation approach coupled with nano high-performance liquid chromatography-tandem mass spectrometry analysis was employed to detect and identify differentially expressed proteins. A total of 46 proteins was identified and categorized into functional classes that mostly included metabolism and transport, cytoplasm and organelle, ion and nucleotide binding, indicating that bisphenol A toxicity in fish brain is complex. The biological pathways of starch and sucrose metabolism, calcium signaling, and aminoacyl-tRNA biosynthesis were also induced. Proteomic analyses add new perspectives to bisphenol A neurotoxicity in aquatic organisms. 相似文献
982.
The potential for negative effects caused by endocrine disrupting chemicals (EDCs) release into the environment is a prominent concern and numerous research projects have investigated possible environmental fate and toxicity. However, their sorption behavior by size fractions of soil and sediment has not been systematically represented. The sorption of bisphenol A (BPA), 17α-ethinyl estradiol (EE2) and phenanthrene (Phen) by different size fractions of soil and sediment were investigated. Sorption isotherms of EE2, BPA, and Phen by size fractions of soil (SL) and sediment (ST) were well fitted to the Freundlich model. The positive correlation between EE2, BPA and Phen sorption capacity (log Kd) of size fractions and their organic carbon (OC) content suggests that OC of size fractions in SL and ST should regulate sorption, while the surface area (SA) of size fractions may not account for sorption of EE2, BPA and Phen. Each size fraction of ST had higher sorption capacity (Kd or KOC) of EE2 and BPA than that of SL due to their difference in the polarity of organic matter (OM) between terrestrial and aquatic sources. Sorption capacity logKd for size fractions of SL and ST did not follow the order: clay > silt > sand due to the difference in OM abundance and composition between the size fractions. Large particle fractions of ST contributed about 80% to the overall sorption for any EE2, BPA, and Phen. This study was significant to evaluate size fractions of soil and sediment as well as their associated OM affecting EE2 and BPA sorption processes. 相似文献
983.
In this study, the presence of bisphenol A (BPA) in human placental and fetal liver samples collected from 1998 to 2008 was investigated to provide a more detailed analysis of the transfer of BPA across the placenta and fetal exposure to BPA. The average concentrations in placental samples were 12.6 ng g−1 for free BPA, 17.2 ng g−1 for BPA-glu, and 30.2 ng g−1 for total BPA. The highest concentrations in placental samples were 165 ng g−1 for free BPA, 178 ng g−1 for BPA-glu, and 280 ng g−1 for total BPA. Samples with higher levels of BPA-glu had higher levels of free BPA in general. Fetal age was observed to have a significant effect on BPA-glu levels in placental samples, but not on free or total BPA. The percentages of free BPA relative to total BPA for the placental samples varied considerably from 4.2% to 100%, suggesting that the ability of maternal liver and/or the placenta to conjugate BPA is highly variable during early to mid-gestation. The average concentrations in fetal liver samples were 9.02 ng g−1 for free BPA, 19.1 ng g−1 for BPA-glu, and 25.8 ng g−1 for total BPA. The highest concentrations in fetal liver samples were 37.7 ng g−1 for free BPA, 93.9 ng g−1 for BPA-glu, and 123 ng g−1 for total BPA. The percentages of free BPA level relative to total BPA for all fetal liver samples varied from 12.4% to 99.1%, indicating extensive variability in the ability of the human feto-placental unit to glucuronidate BPA. 相似文献
984.
采用水热法制备了纳米α-MnO2催化剂,并通过XRD和SEM技术对催化剂的成分和形貌进行了表征。采用纳米α-MnO2催化剂催化臭氧氧化降解水中的双酚A(BPA),考察了初始溶液pH、催化剂加入量和反应温度对BPA去除率的影响。实验结果表明,纳米α-MnO2催化剂催化臭氧氧化降解BPA的最佳工艺条件为:催化剂加入量100 mg/L,初始溶液pH 8.5,反应温度18 ℃。在此最佳条件下处理质量浓度为10 μg/mL的BPA溶液120 min,BPA去除率为96.4%。回收洗涤后第二次使用的催化剂的BPA去除率为80.5%,第三次使用的催化剂的BPA去除率为74.1%,催化剂的活性随重复使用次数的增加而缓慢降低,活性较稳定。 相似文献
985.
986.
Hua-Mao Jiang Zhong-Ze Fang Yun-Feng Cao Cui-Min Hu Xiao-Yu Sun Mo Hong Ling Yang Guang-Bo Ge Yong Liu Yan-Yan Zhang Qiang Dong Ren-Jie Liu 《Chemosphere》2013
Bisphenol A (BPA), the important endocrine-disrupting chemical (EDC), has been reported to be able to induce various toxicity. The present study aims to understand the toxicity behavior of bisphenol A through evaluating the inhibition profile of bisphenol A towards UDP-glucuronosyltransferase (UGT) isoforms. In vitro recombinant UGTs-catalyzed 4-methylumbelliferone (4-MU) glucuronidation reaction was employed as probe reaction for all the tested UGT isoforms. The results showed that bisphenol A exerted stronger inhibition towards UGT2B isoforms than UGT1A isoforms. Furthermore, the inhibition kinetic type and parameters (Ki) were determined for the inhibition of bisphenol A towards UGT2B4, 2B7, 2B15, and 2B17. Bisphenol A exhibited the competitive inhibition towards UGT2B4, and noncompetitive inhibition towards UGT2B7, 2B15 and 2B17. The inhibition kinetic parameters (Ki) were calculated to be 1.1, 32.6, 5.6, and 19.9 μM for UGT2B4, 2B7, 2B15 and 2B17, respectively. In combination with the in vivo concentration of bisphenol A, the elevation of exposure dose was predicted to increase by 29.1%, 1%, 5.7%, and 1.6% for UGT2B4, 2B7, 2B15, and 2B17, indicating the high influence of bisphenol A towards the in vivo UGT2B isofroms-mediated metabolism of xenobiotics and endogenous substances. All these data provide the supporting information for deeper understanding of toxicology of bisphenol A. 相似文献
987.
A/O-生物膜系统处理煤化工废水 总被引:2,自引:0,他引:2
通过在传统A/O工艺好氧池投加聚氨酯填料组成A/O-生物膜复合工艺,建立了一套中试系统,以探讨处理实际煤化工高氨氮工业废水的可行性。结果表明该复合工艺具有很好的抗冲击负荷能力,并且在低温条件下仍能维持很高的去除效果。在温度为10℃以上、进水COD浓度为350~1 100 mg/L、氨氮浓度为80~280 mg/L时,出水COD和氨氮浓度始终维持在60和10 mg/L以下,去除率分别可达到90%和95%以上。低温对系统中悬浮污泥活性的影响比生物膜更大。常温条件下(20℃)生物膜的COD和氨氮降解速率分别为悬浮污泥的1.4和2.5倍,低温条件下(10℃)分别为3.1和3.0倍。 相似文献
988.
989.
从某膜生物反应器(MBR)污泥中筛选出反硝化活性较高的好氧反硝化细菌,进行了反硝化活性检测、菌种鉴定和作用机制探索。结果表明,共分离出6株好氧反硝化细菌,在较低的菌浓度(1×105个/mL)、DO为4.2~5.5mg/L的条件下启动脱氮反应,菌株F2、F4、F5在24、48h的总氮去除率分别超过40.29%、67.19%,硝酸盐氮去除率分别在64.21%、83.31%以上;经16SrDNA序列测序和比对,菌株F2、F4、F5分别与苍白杆菌属(Ochrobactrumsp.)、蜡状芽孢杆菌(Bacillus cereus)、布鲁菌属(Brucellasp.)的同源性最高;PCR扩增结果表明,菌株F2、F4、F5中均具有周质硝酸盐还原酶,这几种细菌很可能通过这种酶来实现好氧反硝化。 相似文献
990.