Toxicities （-1gEC50） of 16 phenolic compounds against Q67 were determined, and structural parameters as well as thermodynamic parameters of these compounds were obtained through fully optimized calculations by using...Toxicities （-1gEC50） of 16 phenolic compounds against Q67 were determined, and structural parameters as well as thermodynamic parameters of these compounds were obtained through fully optimized calculations by using B3LYP method of density functional theory （DFT） at the 6-311G^＊＊ level. Moreover, a 3-parameter （molecular average polarizability （α）, heat energy corrected value （Eth） and the most positive hydrogen atomic charge （qH^＋）） correlation model with R^2 = 0.981 and q^2 = 0.967 to predict -1gEC50 was obtained from experimental data based on the above-mentioned parameters as theoretical descriptors. Therein a was the most significant on -1gEC50. Variance Inflation Factors （VIF）, t-value and cross-validation were applied to verify the model, confirming that the resultant model has fairly better stability and predictive ability to predict -1gEC50 of similar compounds.展开更多
The continuously increasing production of municipal solid waste incineration bottom ash （MSWIBA） has promoted its utilization as construction material and raised environmental concern. The physico-chemical propertie...The continuously increasing production of municipal solid waste incineration bottom ash （MSWIBA） has promoted its utilization as construction material and raised environmental concern. The physico-chemical properties and leaching behavior of MSWIBA were studied, and ecotoxicological testing using a luminescent bacterium bioassay was performed to assess the ecological pollution risks associated with its leached constituents. The MSWIBA was leached by two types of leachants, H2SO4/HNO3 and HAc solution, at different liquid to solid ratios and contact times. The concentrations of heavy metals and anions in the leachates were analyzed. Multi- variate statistical analyses, including principle component analysis, Pearson＇s correlation analysis and hierarchical cluster analysis, were used to evaluate the contributions of the constituents to the toxicity （ECso） of the MSWIBA leachate. The statistical analyses of the ecotoxicological results showed that the Ba, Cr, Cu, Pb, F and total organic carbon （TOC） concentrations were closely correlated with the ECso value, and these substances were the main contributors to the ecotoxicity of the MSWIBA leachate. In addition, the cluster of these variables indicated similar leaching behaviors. Overall, the research demonstrated that the ecotoxicological risks resulting from MSWIBA leaching could be assessed before its utilization, which provides crucial information for the adaptation of MSWIBA as alternative materials.展开更多
Toxicities （–lgEC50） of 16 halogeno-benzenes against vibrio qinghaiensis （Q67） were measured systematically, and their 2D-QSAR model （R2=0.875, q2=0.821） was established, which included two parameters： average...Toxicities （–lgEC50） of 16 halogeno-benzenes against vibrio qinghaiensis （Q67） were measured systematically, and their 2D-QSAR model （R2=0.875, q2=0.821） was established, which included two parameters： averaged polarizability （α） and total energy （TE）. The proposed model indicated that the toxicities of this kind of compounds were proportionate to α, i.e., their toxicities were relative to the molecular volume. Furthermore, 3D-QSAR model （R2=0.929, q2=0.712） of –lgEC50 was proposed by using comparative molecular force field （CoMFA） based on the molecular simulation. To our interest, 3D-QSAR model suggested that the hydrophobicity of substituents was the dominating factor for the toxicities, the electrostatic effect was the secondly important, and the steric field gave the least contribution. Comparably, the prediction ability of the 3D-QSAR model is slightly more advantageous than that of 2D-QSAR, and they can be used complementally in the toxicity description of this kind of compounds.展开更多
Toxicities （-lgEC50） of 16 fluorobenzene derivants against vibrio qinghaiensis （Q67） were measured systematically,and their quantum chemistry parameters were calculated at the B3LYP/6-311G＊＊ level. Based on the ...Toxicities （-lgEC50） of 16 fluorobenzene derivants against vibrio qinghaiensis （Q67） were measured systematically,and their quantum chemistry parameters were calculated at the B3LYP/6-311G＊＊ level. Based on the experimental toxicity data and quantum chemistry parameters,2D-QSAR model was proposed,which was validated by variance inflation factors （VIF）,t-value and cross-validation method. At the mean time,comparative molecular force field （CoMFA） based on molecular simulation was used to investigate the toxicity of fluorobenzene derivants. Furthermore,the intoxicating mechanism of fluorobenzene derivants was discussed. To our interest,2D-QSAR and CoMFA models exhibit good prediction ability,with which the toxicity of similar compounds can be predicted. Finally,toxicities （-lgEC50） of 12 fluorobenzene derivants against vibrio qinghaiensis （Q67） were predicted with these models.展开更多
目的:基于明亮发光杆菌502和青海弧菌Q67的Microtox微毒测试体系比较研究,明确两者适宜的反应条件。方法:1考察明亮发光杆菌502和青海弧菌Q67在15℃±1℃、20℃±1℃、25℃±1℃下的相对发光情况;2采用Plackett-Burman法优...目的:基于明亮发光杆菌502和青海弧菌Q67的Microtox微毒测试体系比较研究,明确两者适宜的反应条件。方法:1考察明亮发光杆菌502和青海弧菌Q67在15℃±1℃、20℃±1℃、25℃±1℃下的相对发光情况;2采用Plackett-Burman法优化设计影响明亮发光杆菌502和青海弧菌Q67发光的因素;3采用Plackett-Burman法优化得到的反应体系,考察不同p H复苏液对上述两种细菌相对发光强度的影响。结果:1明亮发光杆菌502的相对发光强度随温度的升高而增强,而青海弧菌Q67的相对发光强度随温度的升高先增强后减弱。2Plackett-Burman法得到最优发光条件为:明亮发光杆菌502冻干粉平衡10min后加入复苏液2ml,混匀15min,取100μl菌液测试初始发光度,随后立即加入1ml复苏液或待测样品,反应15min后再次测试相应发光强度;青海弧菌Q67冻干粉平衡10min后加入复苏液2ml,混匀10min,取100μl菌液测试初始发光度,随后立即加入2ml复苏液或待测样品,反应10min后再次测试相应发光强度。3复苏液p H 3.6-p H 3.8时对明亮发光杆菌502发光的影响由抑制转为增强;复苏液p H 4.5-p H 5.0时对青海弧菌Q67发光强度的影响<±15%。结论:与明亮发光杆菌502比较,青海弧菌Q67具有更宽的p H耐受范围并且在检测时无需调节待测样品渗透压。展开更多
基金supported by the Natural Science Foundation of Zhejiang Province (No. 2008Y507280)
文摘Toxicities （-1gEC50） of 16 phenolic compounds against Q67 were determined, and structural parameters as well as thermodynamic parameters of these compounds were obtained through fully optimized calculations by using B3LYP method of density functional theory （DFT） at the 6-311G^＊＊ level. Moreover, a 3-parameter （molecular average polarizability （α）, heat energy corrected value （Eth） and the most positive hydrogen atomic charge （qH^＋）） correlation model with R^2 = 0.981 and q^2 = 0.967 to predict -1gEC50 was obtained from experimental data based on the above-mentioned parameters as theoretical descriptors. Therein a was the most significant on -1gEC50. Variance Inflation Factors （VIF）, t-value and cross-validation were applied to verify the model, confirming that the resultant model has fairly better stability and predictive ability to predict -1gEC50 of similar compounds.
基金The authors gratefully acknowledge the financial supports from the National Basic Research Program of China （No. 2011CB201500）, the National Social Science Fund of China （No. 12＆ZD236）, the National Natural Science Foundation of China （Grant No. 21277096）, and the Collaborative Innovation Center for Regional Environ- mental Quality.
文摘The continuously increasing production of municipal solid waste incineration bottom ash （MSWIBA） has promoted its utilization as construction material and raised environmental concern. The physico-chemical properties and leaching behavior of MSWIBA were studied, and ecotoxicological testing using a luminescent bacterium bioassay was performed to assess the ecological pollution risks associated with its leached constituents. The MSWIBA was leached by two types of leachants, H2SO4/HNO3 and HAc solution, at different liquid to solid ratios and contact times. The concentrations of heavy metals and anions in the leachates were analyzed. Multi- variate statistical analyses, including principle component analysis, Pearson＇s correlation analysis and hierarchical cluster analysis, were used to evaluate the contributions of the constituents to the toxicity （ECso） of the MSWIBA leachate. The statistical analyses of the ecotoxicological results showed that the Ba, Cr, Cu, Pb, F and total organic carbon （TOC） concentrations were closely correlated with the ECso value, and these substances were the main contributors to the ecotoxicity of the MSWIBA leachate. In addition, the cluster of these variables indicated similar leaching behaviors. Overall, the research demonstrated that the ecotoxicological risks resulting from MSWIBA leaching could be assessed before its utilization, which provides crucial information for the adaptation of MSWIBA as alternative materials.
基金supported by the Analysis Science and Technology Project of Zhejiang Province (2009F70007)
文摘Toxicities （–lgEC50） of 16 halogeno-benzenes against vibrio qinghaiensis （Q67） were measured systematically, and their 2D-QSAR model （R2=0.875, q2=0.821） was established, which included two parameters： averaged polarizability （α） and total energy （TE）. The proposed model indicated that the toxicities of this kind of compounds were proportionate to α, i.e., their toxicities were relative to the molecular volume. Furthermore, 3D-QSAR model （R2=0.929, q2=0.712） of –lgEC50 was proposed by using comparative molecular force field （CoMFA） based on the molecular simulation. To our interest, 3D-QSAR model suggested that the hydrophobicity of substituents was the dominating factor for the toxicities, the electrostatic effect was the secondly important, and the steric field gave the least contribution. Comparably, the prediction ability of the 3D-QSAR model is slightly more advantageous than that of 2D-QSAR, and they can be used complementally in the toxicity description of this kind of compounds.
基金Supported by the National Natural Science Foundation of China (No. 20977046, 20737001)
文摘Toxicities （-lgEC50） of 16 fluorobenzene derivants against vibrio qinghaiensis （Q67） were measured systematically,and their quantum chemistry parameters were calculated at the B3LYP/6-311G＊＊ level. Based on the experimental toxicity data and quantum chemistry parameters,2D-QSAR model was proposed,which was validated by variance inflation factors （VIF）,t-value and cross-validation method. At the mean time,comparative molecular force field （CoMFA） based on molecular simulation was used to investigate the toxicity of fluorobenzene derivants. Furthermore,the intoxicating mechanism of fluorobenzene derivants was discussed. To our interest,2D-QSAR and CoMFA models exhibit good prediction ability,with which the toxicity of similar compounds can be predicted. Finally,toxicities （-lgEC50） of 12 fluorobenzene derivants against vibrio qinghaiensis （Q67） were predicted with these models.
文摘目的:基于明亮发光杆菌502和青海弧菌Q67的Microtox微毒测试体系比较研究,明确两者适宜的反应条件。方法:1考察明亮发光杆菌502和青海弧菌Q67在15℃±1℃、20℃±1℃、25℃±1℃下的相对发光情况;2采用Plackett-Burman法优化设计影响明亮发光杆菌502和青海弧菌Q67发光的因素;3采用Plackett-Burman法优化得到的反应体系,考察不同p H复苏液对上述两种细菌相对发光强度的影响。结果:1明亮发光杆菌502的相对发光强度随温度的升高而增强,而青海弧菌Q67的相对发光强度随温度的升高先增强后减弱。2Plackett-Burman法得到最优发光条件为:明亮发光杆菌502冻干粉平衡10min后加入复苏液2ml,混匀15min,取100μl菌液测试初始发光度,随后立即加入1ml复苏液或待测样品,反应15min后再次测试相应发光强度;青海弧菌Q67冻干粉平衡10min后加入复苏液2ml,混匀10min,取100μl菌液测试初始发光度,随后立即加入2ml复苏液或待测样品,反应10min后再次测试相应发光强度。3复苏液p H 3.6-p H 3.8时对明亮发光杆菌502发光的影响由抑制转为增强;复苏液p H 4.5-p H 5.0时对青海弧菌Q67发光强度的影响<±15%。结论:与明亮发光杆菌502比较,青海弧菌Q67具有更宽的p H耐受范围并且在检测时无需调节待测样品渗透压。
