Objective: This study was to assess the influence of interaction of combination of immobilized nitrogen cycling bacteria (INCB) with aquatic macrophytes on nitrogen removal from the eutrophic waterbody, and to get ins...Objective: This study was to assess the influence of interaction of combination of immobilized nitrogen cycling bacteria (INCB) with aquatic macrophytes on nitrogen removal from the eutrophic waterbody, and to get insight into different mechanisms involved in nitrogen removal. Methods: The aquatic macrophytes used include Eichhornia crassipes (sum-mer-autumn floating macrophyte), Elodea nuttallii (winter-growing submerged macrophyte), and nitrogen cycling bacteria in-cluding ammonifying, nitrosating, nitrifying and denitrifying bacteria isolated from Taihu Lake. The immobilization carriers materials were made from hydrophilic monomers 2-hydroxyethyl acrylate (HEA) and hydrophobic 2-hydroxyethyl methylacrylate (HEMA). Two experiments were conducted to evaluate the roles of macrophytes combined with INCB on nitrogen removal from eutrophic water during different seasons. Results: Eichhornia crassipes and Elodea nuttallii had different potentials in purification of eutrophic water. Floating macrophyte+bacteria (INCB) performed best in improving water quality (during the first experiment) and decreased total nitrogen (TN) by 70.2%, nitrite and ammonium by 92.2% and 50.9%, respectively, during the experimental period, when water transparency increased from 0.5 m to 1.8 m. When INCB was inoculated into the floating macrophyte system, the populations of nitrosating, nitrifying, and denitrifying bacteria increased by 1 to 2 orders of magnitude compared to the un-inoculated treatments, but ammonifying bacteria showed no obvious difference between different treatments. Lower values of chlorophyll a, CODMn, and pH were found in the microbial-plant integrated system, as compared to the control. Highest reduction in N was noted during the treatment with submerged macrophyte+INCB, being 26.1% for TN, 85.2% for nitrite, and 85.2% for ammonium at the end of 2nd experiment. And in the treatment, the populations of ammonifying, nitrosating, nitrifying, and de-nitrifying bacteria increased by 1 to 3 orders of magnitude, as compared 展开更多
INCB024360是进入临床试验的吲哚胺2,3-双加氧化酶Ⅰ(IDO1)抑制剂之一,但其结合机理尚不明晰。本文运用分子对接、分子动力学、自由能计算和丙氨酸突变扫描方法研究了IDO1和INCB024360的结合模式。结果表明,IDO1和INCB024360的复合物形...INCB024360是进入临床试验的吲哚胺2,3-双加氧化酶Ⅰ(IDO1)抑制剂之一,但其结合机理尚不明晰。本文运用分子对接、分子动力学、自由能计算和丙氨酸突变扫描方法研究了IDO1和INCB024360的结合模式。结果表明,IDO1和INCB024360的复合物形成了6个氢键,结合自由能为-70. 82 k J/mol,静电作用力是主要驱动力,极性溶剂化能是主要抑制力;丙氨酸突变扫描发现,Ser263和Glu171是两者结合的关键氨基酸,ΔΔGbind值分别为15. 35和54. 39 k J/mol。本文的结果可为阐明IDO1和INCB02436结合的分子机制提供重要依据。展开更多
基金Project supported by the Ministry of Science and Technology of China, the Education Ministry of China (No. 20305), Australia Gov-ernment’s Innovation Statement Backing Australia’s Ability (No. [2002]68), and the Science and Technology Bureau of ZhejiangProvince (No. 2005C22020), China
文摘Objective: This study was to assess the influence of interaction of combination of immobilized nitrogen cycling bacteria (INCB) with aquatic macrophytes on nitrogen removal from the eutrophic waterbody, and to get insight into different mechanisms involved in nitrogen removal. Methods: The aquatic macrophytes used include Eichhornia crassipes (sum-mer-autumn floating macrophyte), Elodea nuttallii (winter-growing submerged macrophyte), and nitrogen cycling bacteria in-cluding ammonifying, nitrosating, nitrifying and denitrifying bacteria isolated from Taihu Lake. The immobilization carriers materials were made from hydrophilic monomers 2-hydroxyethyl acrylate (HEA) and hydrophobic 2-hydroxyethyl methylacrylate (HEMA). Two experiments were conducted to evaluate the roles of macrophytes combined with INCB on nitrogen removal from eutrophic water during different seasons. Results: Eichhornia crassipes and Elodea nuttallii had different potentials in purification of eutrophic water. Floating macrophyte+bacteria (INCB) performed best in improving water quality (during the first experiment) and decreased total nitrogen (TN) by 70.2%, nitrite and ammonium by 92.2% and 50.9%, respectively, during the experimental period, when water transparency increased from 0.5 m to 1.8 m. When INCB was inoculated into the floating macrophyte system, the populations of nitrosating, nitrifying, and denitrifying bacteria increased by 1 to 2 orders of magnitude compared to the un-inoculated treatments, but ammonifying bacteria showed no obvious difference between different treatments. Lower values of chlorophyll a, CODMn, and pH were found in the microbial-plant integrated system, as compared to the control. Highest reduction in N was noted during the treatment with submerged macrophyte+INCB, being 26.1% for TN, 85.2% for nitrite, and 85.2% for ammonium at the end of 2nd experiment. And in the treatment, the populations of ammonifying, nitrosating, nitrifying, and de-nitrifying bacteria increased by 1 to 3 orders of magnitude, as compared
文摘INCB024360是进入临床试验的吲哚胺2,3-双加氧化酶Ⅰ(IDO1)抑制剂之一,但其结合机理尚不明晰。本文运用分子对接、分子动力学、自由能计算和丙氨酸突变扫描方法研究了IDO1和INCB024360的结合模式。结果表明,IDO1和INCB024360的复合物形成了6个氢键,结合自由能为-70. 82 k J/mol,静电作用力是主要驱动力,极性溶剂化能是主要抑制力;丙氨酸突变扫描发现,Ser263和Glu171是两者结合的关键氨基酸,ΔΔGbind值分别为15. 35和54. 39 k J/mol。本文的结果可为阐明IDO1和INCB02436结合的分子机制提供重要依据。
