Two indigenous microorganisms, Bacillus sp. SB02 and Mucor sp. SF06, capable of degrading polycyclic aromatic hydrocarbons （PAHs） were co-immobilized on vermiculite by physical adsorption and used to degrade benzo[a...Two indigenous microorganisms, Bacillus sp. SB02 and Mucor sp. SF06, capable of degrading polycyclic aromatic hydrocarbons （PAHs） were co-immobilized on vermiculite by physical adsorption and used to degrade benzo[a] pyrene （BaP）. The characteristics of BaP degradation by both free and co-immobilized microorganism were then investigated and compared. The removal rate using the immobilized bacterial-fungal mixed consortium was higher than that of the freely mobile mixed consortium. 95.3% of BaP was degraded using the co-immobilized system within 42 d, which was remarkably higher than the removal rate of that by the free strains. The optimal amount of inoculated co-immobilized system for BaP degradation was 2%. The immobilized bacterial-fungal mixed consortium also showed better water stability than the free strains. Kinetics of BaP biodegradation by co-immobilized SF06 and SB02 were also studied. The results demonstrated that BaP degradation could be well described by a zero-order reaction rate equation when the initial BaP concentration was in the range of 10--200 mg/kg. The scanning electronic microscope （SEM） analysis showed that the co-immobilized microstructure was suitable for the growth of SF06 and SB02. The mass transmission process of co-immobilized system in soil is discussed. The results demonstrate the potential for employing the bacterial-fungal mixed consortium, co-immobilized on vermiculite, for in situ bioremediation of BaP.展开更多
The rates of photodegradation and photocatalysis of benzo [a]pyrene （BaP） on soil surfaces under UV light have been studied. Different parameters such as temperature, soil particle sizes, and soil depth responsible ...The rates of photodegradation and photocatalysis of benzo [a]pyrene （BaP） on soil surfaces under UV light have been studied. Different parameters such as temperature, soil particle sizes, and soil depth responsible for photodegradation, catalyst loads and wavelength of UV irradiation blamed for photocatalysis have been monitored. The results obtained indicated that BaP photodegradation follows pseudo-first-order kinetics. BaP photodegradation was the fastest at 30℃ . The rates of BaP photodegradation at different soil particle size followed the order： less than 1 mm〉less than 0.45 mm〉less than 0.25 mm. When the soil depth increased from 1 mm to 4 ram, the half-life increased from 13.23 d to 17.73 d. The additions of TiO2 or Fe2O3 accelerated the photodegradation of BaP, and the photocatalysis of BaP follows pseudo-first-order kinetics. Changes in catalyst loads of TiO2 （0.5%, 1%, 2%, and 3% （wt）） or Fe203 （2%, 5%, 7%, and 10% （wt）） did not significantly affect the degradation rates. Both BaP photocatalysis in the presence of TiO2 and Fe2O3 were the fastest at 254 nm UV irradiation.展开更多
Several main metabolites of benzo[a]pyrene （BaP） formed by Penicillium chrysogenum, Benzo[a]pyrene-1,6-quinone （BP 1,6- quinone）, trans-7,8-dihydroxy-7,8-dihydrobenzo[a]pyrene （BP 7,8-diol）, 3-hydroxybenzo[a]pyr...Several main metabolites of benzo[a]pyrene （BaP） formed by Penicillium chrysogenum, Benzo[a]pyrene-1,6-quinone （BP 1,6- quinone）, trans-7,8-dihydroxy-7,8-dihydrobenzo[a]pyrene （BP 7,8-diol）, 3-hydroxybenzo[a]pyrene （3-OHBP）, were identified by high-performance liquid chromatography （HPLC）. The three metabolites were liable to be accumulated and were hardly further metabolized because of their toxicity to microorganisms. However, their further degradation was essential for the complete degradation of BaP. To enhance their degradation, two methods, degradation by coupling Penicillium chrysogenum with KMnO4 and degradation only by Penicillium chrysogenum, were compared; Meanwhile, the parameters of degradation in the superior method were optimized. The results showed that （1） the method of coupling Penicillium chrysogenum with KMnO4 was better and was the first method to be used in the degradation of BaP and its metabolites; （2） the metabolite, BP 1,6-quinone was the most liable to be accumulated in pure cultures; （3） the effect of degradation was the best when the concentration of KMnO4 in the cultures was 0.01% （w/v）, concentration of the three compounds was 5 mg/L and pH was 6.2. Based on the experimental results, a novel concept with regard to the bioremediation of BaP-contaminated environment was discussed, considering the influence on environmental toxicity of the accumulated metabolites.展开更多
目的比较老年营养风险指数(GNRI)与营养风险筛查2002(NRS2002)在糖尿病肾病(DKD)患者中的应用价值。方法选取DKD患者218例,采用GNRI及NRS2002分别对其进行营养风险筛查。收集患者相关营养及肾功能指标,对两种筛查工具评分与上述生化指...目的比较老年营养风险指数(GNRI)与营养风险筛查2002(NRS2002)在糖尿病肾病(DKD)患者中的应用价值。方法选取DKD患者218例,采用GNRI及NRS2002分别对其进行营养风险筛查。收集患者相关营养及肾功能指标,对两种筛查工具评分与上述生化指标进行相关性分析。结果218例患者中GNRI评分<92分的有91例(41.7%),NRS2002评分≥3分的有51例(23.4%),二者营养风险筛查结果的一致性不理想。两种筛查工具得分与营养指标体质指数(BMI)、血清白蛋白(Alb)、血清前白蛋白(PA)、血红蛋白(HGB)均具有相关性(P<0.01)。GNRI得分与肾功能指标(尿微量白蛋白/尿肌酐)ACR、肾小球滤过虑(eGFR)、随机尿蛋白/随机尿肌酐(Up/Ucr)、24 h尿蛋白(24 h UP)、肌酐(Cr)、尿素(BUN)具有相关性(P<0.01),NRS2002得分与肾功能指标无相关性(P>0.05)。结论相比NRS2002,GNRI能更好地反映DKD患者营养及肾功能状况,适宜在临床推广应用,为DKD患者的精准营养支持提供科学依据。展开更多
目的系统综述运动对慢性阻塞性肺疾病(COPD)系统性炎症及骨骼肌功能障碍的干预效果。方法检索建库至2021年6月PubMed、Web of Science、CNKI、维普和万方数据,运动对COPD系统性炎症及骨骼肌功能障碍干预效果的相关文献,并辅以参考文献...目的系统综述运动对慢性阻塞性肺疾病(COPD)系统性炎症及骨骼肌功能障碍的干预效果。方法检索建库至2021年6月PubMed、Web of Science、CNKI、维普和万方数据,运动对COPD系统性炎症及骨骼肌功能障碍干预效果的相关文献,并辅以参考文献回溯和手工检索。提取文献内容,对运动改善COPD系统性炎症及骨骼肌功能障碍的效果进行综述。结果共检索到文献192篇,最终纳入8篇,245例被试。运动可以降低促炎因子水平,提高抗炎因子水平;提高COPD患者运动能力,改善骨骼肌结构。运动改善COPD系统性炎症与运动方式、强度以及持续时间有关,可能通过调控炎症反应,影响泛素-蛋白酶、胰岛素样生长因子1/磷脂酰肌醇-3-激酶/Akt等途径,改善骨骼肌功能障碍。结论运动对降低COPD系统性炎症水平、改善骨骼肌功能障碍具有一定效果。展开更多
This study reports the feasibility of remediation of a heavy metal （HM） contaminated soil using tartaric acid, an environmentally-friendly extractant. Batch experiments were performed to test the factors influencing...This study reports the feasibility of remediation of a heavy metal （HM） contaminated soil using tartaric acid, an environmentally-friendly extractant. Batch experiments were performed to test the factors influencing remediation of the HM contaminated soil. An empirical model was employed to describe the kinetics of riM dissolution/desorption and to predict equilibrium concentrations of HMs in soil leachate. The changes of HMs in different fractions before and after tartaric acid treatment were also investigated. Tartaric acid solution containing HMs was regenerated by chestnut shells. Results show that utilization of tartaric acid was effective for removal of riMs from the contaminated soil, attaining 50%-60% of Cd, 40%-50% of Pb, 40%-50% of Cu and 20%-30% of Zn in the pH range of 3.5-4.0 within 24 h. Mass transfer coefficients for cadmium （Cd） and lead （Pb） were much higher than those for copper （Cu） and zinc （Zn）. Sequential fractionations of treated and untreated soil samples showed that tartaric acid was effective in removing the exchangeable, carbonate fractions of Cd, Zn and Cu from the contaminated soil. The contents of Pb and Cu in Fe-Mn oxide fraciton were also significantly decreased by tartaric acid treatment. One hundred milliliters of tartaric acid solution containing HMs could be regenerated by 10 g chestnut shells in a batch reactor. Such a remediation procedure indicated that tartaric acid is a promising agent for remediation of HM contaminated soils. However, further research is needed before the method can be practically used for in situ remediation of contaminated sites.展开更多
基金The National Basic Research Program (973) of China (No. 2004CB418506)the National Natural Science Foundation of China (No.20337010) the Hi-Tech Research and Development Program (863) of China (No. 2004AA649060)
文摘Two indigenous microorganisms, Bacillus sp. SB02 and Mucor sp. SF06, capable of degrading polycyclic aromatic hydrocarbons （PAHs） were co-immobilized on vermiculite by physical adsorption and used to degrade benzo[a] pyrene （BaP）. The characteristics of BaP degradation by both free and co-immobilized microorganism were then investigated and compared. The removal rate using the immobilized bacterial-fungal mixed consortium was higher than that of the freely mobile mixed consortium. 95.3% of BaP was degraded using the co-immobilized system within 42 d, which was remarkably higher than the removal rate of that by the free strains. The optimal amount of inoculated co-immobilized system for BaP degradation was 2%. The immobilized bacterial-fungal mixed consortium also showed better water stability than the free strains. Kinetics of BaP biodegradation by co-immobilized SF06 and SB02 were also studied. The results demonstrated that BaP degradation could be well described by a zero-order reaction rate equation when the initial BaP concentration was in the range of 10--200 mg/kg. The scanning electronic microscope （SEM） analysis showed that the co-immobilized microstructure was suitable for the growth of SF06 and SB02. The mass transmission process of co-immobilized system in soil is discussed. The results demonstrate the potential for employing the bacterial-fungal mixed consortium, co-immobilized on vermiculite, for in situ bioremediation of BaP.
基金The National Basic Research Program (973) of China (No. 2004CB418506)the National Natural Science Foundation of China (No.20337010) the Hi-Tech Research and Development Program (863) of China (No. 2004AA649060)
文摘The rates of photodegradation and photocatalysis of benzo [a]pyrene （BaP） on soil surfaces under UV light have been studied. Different parameters such as temperature, soil particle sizes, and soil depth responsible for photodegradation, catalyst loads and wavelength of UV irradiation blamed for photocatalysis have been monitored. The results obtained indicated that BaP photodegradation follows pseudo-first-order kinetics. BaP photodegradation was the fastest at 30℃ . The rates of BaP photodegradation at different soil particle size followed the order： less than 1 mm〉less than 0.45 mm〉less than 0.25 mm. When the soil depth increased from 1 mm to 4 ram, the half-life increased from 13.23 d to 17.73 d. The additions of TiO2 or Fe2O3 accelerated the photodegradation of BaP, and the photocatalysis of BaP follows pseudo-first-order kinetics. Changes in catalyst loads of TiO2 （0.5%, 1%, 2%, and 3% （wt）） or Fe203 （2%, 5%, 7%, and 10% （wt）） did not significantly affect the degradation rates. Both BaP photocatalysis in the presence of TiO2 and Fe2O3 were the fastest at 254 nm UV irradiation.
基金Project supported by the National Basic Research Program (973) of China (No. 2004CB418506)the National Hi-Tech Research and Development Program (863) of China (No. 2004AA649060)the National Natural Science Foundation of China (No. 20337010).
文摘Several main metabolites of benzo[a]pyrene （BaP） formed by Penicillium chrysogenum, Benzo[a]pyrene-1,6-quinone （BP 1,6- quinone）, trans-7,8-dihydroxy-7,8-dihydrobenzo[a]pyrene （BP 7,8-diol）, 3-hydroxybenzo[a]pyrene （3-OHBP）, were identified by high-performance liquid chromatography （HPLC）. The three metabolites were liable to be accumulated and were hardly further metabolized because of their toxicity to microorganisms. However, their further degradation was essential for the complete degradation of BaP. To enhance their degradation, two methods, degradation by coupling Penicillium chrysogenum with KMnO4 and degradation only by Penicillium chrysogenum, were compared; Meanwhile, the parameters of degradation in the superior method were optimized. The results showed that （1） the method of coupling Penicillium chrysogenum with KMnO4 was better and was the first method to be used in the degradation of BaP and its metabolites; （2） the metabolite, BP 1,6-quinone was the most liable to be accumulated in pure cultures; （3） the effect of degradation was the best when the concentration of KMnO4 in the cultures was 0.01% （w/v）, concentration of the three compounds was 5 mg/L and pH was 6.2. Based on the experimental results, a novel concept with regard to the bioremediation of BaP-contaminated environment was discussed, considering the influence on environmental toxicity of the accumulated metabolites.
文摘目的比较老年营养风险指数(GNRI)与营养风险筛查2002(NRS2002)在糖尿病肾病(DKD)患者中的应用价值。方法选取DKD患者218例,采用GNRI及NRS2002分别对其进行营养风险筛查。收集患者相关营养及肾功能指标,对两种筛查工具评分与上述生化指标进行相关性分析。结果218例患者中GNRI评分<92分的有91例(41.7%),NRS2002评分≥3分的有51例(23.4%),二者营养风险筛查结果的一致性不理想。两种筛查工具得分与营养指标体质指数(BMI)、血清白蛋白(Alb)、血清前白蛋白(PA)、血红蛋白(HGB)均具有相关性(P<0.01)。GNRI得分与肾功能指标(尿微量白蛋白/尿肌酐)ACR、肾小球滤过虑(eGFR)、随机尿蛋白/随机尿肌酐(Up/Ucr)、24 h尿蛋白(24 h UP)、肌酐(Cr)、尿素(BUN)具有相关性(P<0.01),NRS2002得分与肾功能指标无相关性(P>0.05)。结论相比NRS2002,GNRI能更好地反映DKD患者营养及肾功能状况,适宜在临床推广应用,为DKD患者的精准营养支持提供科学依据。
文摘目的系统综述运动对慢性阻塞性肺疾病(COPD)系统性炎症及骨骼肌功能障碍的干预效果。方法检索建库至2021年6月PubMed、Web of Science、CNKI、维普和万方数据,运动对COPD系统性炎症及骨骼肌功能障碍干预效果的相关文献,并辅以参考文献回溯和手工检索。提取文献内容,对运动改善COPD系统性炎症及骨骼肌功能障碍的效果进行综述。结果共检索到文献192篇,最终纳入8篇,245例被试。运动可以降低促炎因子水平,提高抗炎因子水平;提高COPD患者运动能力,改善骨骼肌结构。运动改善COPD系统性炎症与运动方式、强度以及持续时间有关,可能通过调控炎症反应,影响泛素-蛋白酶、胰岛素样生长因子1/磷脂酰肌醇-3-激酶/Akt等途径,改善骨骼肌功能障碍。结论运动对降低COPD系统性炎症水平、改善骨骼肌功能障碍具有一定效果。
文摘This study reports the feasibility of remediation of a heavy metal （HM） contaminated soil using tartaric acid, an environmentally-friendly extractant. Batch experiments were performed to test the factors influencing remediation of the HM contaminated soil. An empirical model was employed to describe the kinetics of riM dissolution/desorption and to predict equilibrium concentrations of HMs in soil leachate. The changes of HMs in different fractions before and after tartaric acid treatment were also investigated. Tartaric acid solution containing HMs was regenerated by chestnut shells. Results show that utilization of tartaric acid was effective for removal of riMs from the contaminated soil, attaining 50%-60% of Cd, 40%-50% of Pb, 40%-50% of Cu and 20%-30% of Zn in the pH range of 3.5-4.0 within 24 h. Mass transfer coefficients for cadmium （Cd） and lead （Pb） were much higher than those for copper （Cu） and zinc （Zn）. Sequential fractionations of treated and untreated soil samples showed that tartaric acid was effective in removing the exchangeable, carbonate fractions of Cd, Zn and Cu from the contaminated soil. The contents of Pb and Cu in Fe-Mn oxide fraciton were also significantly decreased by tartaric acid treatment. One hundred milliliters of tartaric acid solution containing HMs could be regenerated by 10 g chestnut shells in a batch reactor. Such a remediation procedure indicated that tartaric acid is a promising agent for remediation of HM contaminated soils. However, further research is needed before the method can be practically used for in situ remediation of contaminated sites.
