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Occurrence,formation and environmental fate of polycyclic aromatic hydrocarbons in biochars

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Fundamental Research 2021年第3期1卷 296-305页

作者： Emmanuel Stephen Odinga Fredrick Owino Gudda Michael Gatheru Waigi Jian Wang yanzheng gao Institute of Organic Contaminant Control and Soil Remediation College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095China

Biochar application for soil and agro-environmental development has attracted great attention due to its numerous advantages:improving the soil,mitigating greenhouse gas emissions,increasing crop productivity,and augmenting soil carbon ***,during the pyrolytic conversion of waste biomass,polycyclic aromatic hydrocarbons(PAHs),a category of toxic organic pollutants,are inescapably generated and linger on the residual solid coproduct called ***,it is crucial to assess the environmental persistence,bioavailability,effects of biochar-borne PAHs on plant growth and soil microbial community dynamics,food safety,and human health after application into *** review highlights the basic need to unravel critical mechanisms driving PAH formation in biochar and the dynamics between the sorbent(biochar)and soil microbes,along with the possible mitigation *** research gaps,including the influence of biochar application on the short and long-term fate of PAHs,as well as the proper control measures for biochar quality and associated risks,will be discussed *** key research findings from this script will lead to proposals in technological and quality control measures during biochar production to ensure they are clean and safe.

关键词： Biochar Polycyclic aromatic hydrocarbons Soil Environmental fate Toxicity

A novel metabolic pathway of 17β-estradiol by Novosphingobium sp. ES2-1 as probed via HRMS combined with 13C3-labeling

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A novel metabolic pathway of 17β-estradiol by Novosphingobi...

中国土壤学会土壤环境专业委员会第二十次会议暨农田土壤污染与修复研讨会

作者： Shunyao Li yanzheng gao Institute of Organic Contaminant Control and Soil Remediation College of Resources and Environmental Sciences Nanjing Agricultural University

Estrogens are powerful hormones that can cause broad biological changes, even at very low concentrations. Through waste-streams these hormones spread into the environment and cause ecological and human health problems. Bacterial genetic diversity and their metabolisms provide a solution to reduce this problem. Here, a unique catabolic pathway of 17β-estradiol(E2) transformation by Novosphingobium sp. ES2-1 was described using high-resolution mass spectrometry(HRMS) combined with C-labeling. Eight intermediate metabolites with six previously unreported, were observed and showed a cleavage step for the steroid skeleton, and further concluded that hydroxylation followed by β-oxidation happened in a cycle: whereby E2 was first converted to estrone, hydroxylated to 4-hydroxyestrone, and sequential metabolite production through oxidation, resulting in saturated ring cleavage. Fracture of E2 skeleton was accomplished after complete oxidation from ring A to C, with downstream mineralization of low molecular metabolites obeying a similar oxidation strategy Proteomic analysis provided support for further metabolism, because a newly noted protein 2-keto-4-pentenoate hydratase and some enzymes involving the TCA cycle were identified and showed up-regulated expression that could reasonably explain changes associated with further molecular transformation. Besides, the first three metabolic steps of E2 tramsformation by ES2-1 revealed that a transmembrane transport would be needed to explain the sequential molecular changes of E2, as part of the TCA cycle. The novel E2 transformations discovered have the potential for supporting waste stream hormone removal before these potent molecules impact human and ecological systems.

关键词： Novosphingobium spp Estrogen 17β-estradiol Biodegradation HRMS,13C3-labeling Metabolism

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脊柱外科领域新理念、新进展

中华医学杂志 2019年第43期99卷 3389-3392页

作者：高延征河南省人民医院脊柱脊髓外科郑州大学人民医院河南大学临床医学院郑州450003

随着科学技术的不断发展,脊柱脊髓领域新技术、新理念层出不穷.近年来脊柱基础研究取得了巨大进步;3D打印技术在优化手术方案及实现假体的个性化定制发挥着越来越重要的作用;脊柱非融合理念及微创技术也在临床上占据了一席之地.本文对... 详细信息

随着科学技术的不断发展,脊柱脊髓领域新技术、新理念层出不穷.近年来脊柱基础研究取得了巨大进步;3D打印技术在优化手术方案及实现假体的个性化定制发挥着越来越重要的作用;脊柱非融合理念及微创技术也在临床上占据了一席之地.本文对上述发展进行归纳、总结,以期使读者更全面地了解脊柱脊髓领域的新理念、新进展.

关键词：脊柱 3D打印非融合假体微创手术机器人

Effects of dissolved organic matter from sewage sludge on the atrazine sorption by soils

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Science China(Life Sciences) 2005年第Z1期48卷 57-66页

作者： LING Wanting, XU Jianming & gao yanzheng College of Environmental and Natural Resource Sciences, Zhejiang University, Hangzhou 310029, China College of Natural Resource and Environmental Sciences, Nanjing Agricultural University, Najing 210095, China College of Environmental and Natural Resource Sciences Zhejiang University Hangzhou China College of Natural Resource and Environmental Sciences Nanjing Agricultural University Najing China

The effects of dissolved organic matter (DOM), water soluble organic matter derived from sewage sludge, on the sorption of atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-trazine) by soils were studied using a batch equilibrium technique. Six paddy soils, chosen so as to have different organic carbon contents, were experimented in this investigation. Atrazine sorption isotherms on soils were described by the linear equation, and the distribution coefficients without DOM (Kd) or with DOM (Kd*) were obtained. Generally, the values of Kd*/Kd initially increased and decreased thereafter with increasing DOM concentrations of 0-60 mg DOC · L-1 in soil-solution system form. Critical concentrations of DOM (DOMnp) were obtained where the value of Kd* was equal to Kd. The presence of DOM with concentrations lower than DOMnp promoted atrazine sorption on soils (Kd* > Kd), whereas the presence of DOM with concentrations higher than DOMnp tended to inhibit atrazine sorption (Kd* < Kd). Interestingly, DOMnp for tested soils was negatively correlated to the soil organic carbon content* and the maximum of Kd*/Kd (i.e. Kmax) correlated positively with the maximum of DOM sorption on soil (Xmax). Further investigations showed that the presence of hydrophobic fraction of DOM evidently promoted the atrazine sorption on soils, whereas the presence of hydrophilic DOM fraction obviously tended to inhibit the atrazine sorption. Interactions of soil surfaces with DOM and its fractions were suggested to be the major processes determining atrazine sorption on soils. The results of this work provide a reference to the agricultural use of organic amendment such as sewage sludge for improving the availability of atrazine in soils.

关键词： dissolved organic matter (DOM), atrazine, sorption, soil, environment behaviour.

Composite of PAH-degrading endophytic bacteria reduces contamination and health risks caused by PAHs in vegetables

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Composite of PAH-degrading endophytic bacteria reduces conta...

污染物与生物大分子互作及效应研究前沿与展望

中国土壤学会土壤环境专业委员会第二十次会议暨农田土壤污染与修复研讨会

作者： Wang Jian Liu Juan Ling Wanting Huang Qingguo gao yanzheng Institute of Organic Contaminant Control and Soil Remediation College of Resources and Environmental Sciences Nanjing Agricultural University Department of Crop and Soil Sciences University of Georgia

Vegetables accumulate polycyclic aromatic hydrocarbons(PAHs) at high concentrations when grown in contaminated sites. Inoculation with PAH-degrading endophytic bacteria(EB) has been recognized as one of the most promising ways to remove PAHs from plant bodies;however, the performance of single endophytic bacteria is generally limited. This investigation used a composite of eight EB to reduce the contamination and health risk posed by 16 EPA priority PAHs in vegetables including Chinese cabbage(Brassica chinen sis L.) and pakchoi(Brassica campestris L.). Composite EB have strong PAH degradation abilities, and more than 65% of total PAH were degraded after 10-day insuspension with composite EB. Vegetable were contacted with composite EB by seed soaking(SS) and leaf painting(LP) with an EB cell incubation at OD = 0.2–1.5. Compared with those in non-inoculated controls, the total PAH concentrations in edible parts of Chinese cabbage and pakchoi colonized by composite EB via SS and LP with bacterial suspension at OD = 0.2–1.5 were 42.07–70.77% and 15.79–53.20% lower, and the incremental lifetime cancer risk(ILCR) values for males and females were 31.78–84.08% and 26.60–83.40% smaller, respectively. SS was the optimal inoculation method for reducing PAH concentrations and ILCR values. Our results indicate that inoculating plants with composite EB can lower the health risk posed by vegetables contaminated with PAHs, and may be used to mitigate plant PAH contamination.

关键词： Soil Polycyclic aromatic hydrocarbons PAH-degrading endophytic bacteria Vegetables Incremental lifetime cancer risk

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科学通报 2022年第35期67卷 4155-4158页

作者：高彦征张效伟朱利中南京农业大学土壤有机污染控制与修复研究所南京210095 南京大学环境学院污染控制与资源化研究国家重点实验室南京210023 浙江大学环境与资源学院杭州310058

环境污染与健康的关系是交叉学科领域中重要的热点研究方向之一.当前,重金属、有机毒物等各类有毒化学物质通过多种途径进入环境,病毒、有害基因等生物污染事件多发,严重危害人类健康和生态安全[1,2].通过对195个国家和地区84个疾病负... 详细信息

环境污染与健康的关系是交叉学科领域中重要的热点研究方向之一.当前,重金属、有机毒物等各类有毒化学物质通过多种途径进入环境,病毒、有害基因等生物污染事件多发,严重危害人类健康和生态安全[1,2].通过对195个国家和地区84个疾病负担风险因素的研究发现,环境因素与全球约60%的死亡有关[3,4].

关键词：有毒化学物质生物污染有机毒物交叉学科领域环境因素疾病负担生态安全研究前沿

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Insights into the enzymatic degradation of DNA expedited by typical perfluoroalkyl acids

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Eco-Environment & Health 2023年第4期2卷 278-286页

作者： Chao Qin Run-Hao Zhang Zekai Li Hai-Ming Zhao Yan-Wen Li Nai-Xian Feng Hui Li Quan-Ying Cai Xiaojie Hu yanzheng gao Lei Xiang Ce-Hui Mo Baoshan Xing Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and TechnologyJinan UniversityGuangzhou 510632China Institute of Organic Contaminant Control and Soil Remediation College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095China Stockbridge School of Agriculture University of MassachusettsAmherstMA 01003United States

Perfluoroalkyl acids(PFAAs)are considered forever chemicals,gaining increasing attention for their hazardous ***,the ecological effects of PFAAs remain *** DNA(eDNA),as the environmental gene pool,is often collected for evaluating the ecotoxicological effects of *** this study,we found that all PFAAs investigated,including perfluorohexanoic acid,perfluorooctanoic acid,perfluorononanoic acid,and perfluorooctane sulfonate,even at low concentrations(0.02 and 0.05 mg/L),expedited the enzymatic degradation of DNA in a nonlinear dose–effect relationship,with DNA degradation fragment sizes being lower than 1,000 bp and 200 bp after 15 and 30 min of degradation,*** phenomenon was attributed to the binding interaction between PFAAs and AT bases in DNA via groove *** der Waals force(especially dispersion force)and hydrogen bonding are the main binding *** binding with PFAAs led to decreased base stacking and right-handed helicity,resulting in loose DNA structure exposing more digestion sites for degrading enzymes,and accelerating the enzymatic degradation of *** global ecological risk evaluation results indicated that PFAA contamination could cause medium and high molecular ecological risk in 497 samples from 11 contamination-hot countries(such as the USA,Canada,and China).The findings of this study show new insights into the influence of PFAAs on the environmental fates of biomacromolecules and reveal the hidden molecular ecological effects of PFAAs in the environment.

关键词： DNA Enzymatic degradation Emerging organic pollutants Perfluoroalkyl acids Ecological effects

椎体成形术后手术椎体感染的临床表现和治疗效果

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中华创伤骨科杂志 2021年第1期23卷 33-38页

作者：毛克政高延征毛克亚高坤邵佳河南省人民医院脊柱脊髓外科郑州450003 解放军总医院第一医学中心骨科北京100853

目的报道椎体成形术后手术椎体感染的临床表现和治疗效果。方法回顾性分析2014年1月至2019年6月河南省人民医院脊柱脊髓外科收治的6例椎体成形术后手术椎体感染患者的临床资料。男2例,女4例;年龄64~81岁。背部疼痛视觉模拟评分(VAS)为6~... 详细信息

目的报道椎体成形术后手术椎体感染的临床表现和治疗效果。方法回顾性分析2014年1月至2019年6月河南省人民医院脊柱脊髓外科收治的6例椎体成形术后手术椎体感染患者的临床资料。男2例,女4例;年龄64~81岁。背部疼痛视觉模拟评分(VAS)为6~8分;神经功能评分按美国脊髓损伤协会(ASIA)分级:C级2例,E级4例。所有患者均行感染椎体次全切除联合长节段椎弓根螺钉固定,并给予相应的抗菌治疗。根据患者炎症指标、影像学检查和临床表现等综合判断疗效。结果6例患者术后获12~42个月(平均20.4个月)随访,手术时间295~455 min(平均370.8 min),出血量760~2250 mL(平均1536.7 mL)。无出现硬膜撕裂、神经症状加重或死亡等严重并发症。末次随访时所有患者体温正常,手术切口愈合良好。复查炎症指标正常。末次随访时影像学检查显示内固定物无移位,无螺钉松动和钉棒断裂,植骨区域骨性融合良好,原感染椎体无炎症信号。末次随访时患者背部疼痛VAS评分为2~4分。2例患者ASIA分级从C级改善至D级,4例患者维持E级;4例患者最终可独立正常行走,2例患者需助行器辅助行走。结论椎体成形术后手术椎体感染会导致背部疼痛和神经功能障碍。采用椎体次全切除加长节段椎弓根螺钉固定联合相应的抗菌治疗可以取得良好的治疗效果。

关键词：椎体成形术脊柱炎脊柱骨折骨质疏松性骨折

几种低分子量有机酸和氨基酸对黄棕壤吸附菲的影响

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环境科学学报 2011年第1期31卷 158-163页

作者：孙冰清高彦征孙瑞南京农业大学资源与环境科学学院土壤有机污染控制与修复研究所南京210095

采用批量平衡试验方法,研究了根系分泌物中几种常见的低分子量有机酸(LMWOA)和氨基酸对黄棕壤吸附菲的影响.结果表明,在供试有机酸和氨基酸的影响下黄棕壤对菲的等温吸附曲线仍呈显著的线性关系,分配作用是黄棕壤吸附菲的主导机制,供试L... 详细信息

采用批量平衡试验方法,研究了根系分泌物中几种常见的低分子量有机酸(LMWOA)和氨基酸对黄棕壤吸附菲的影响.结果表明,在供试有机酸和氨基酸的影响下黄棕壤对菲的等温吸附曲线仍呈显著的线性关系,分配作用是黄棕壤吸附菲的主导机制,供试LMWOA和氨基酸对黄棕壤吸附菲有抑制作用,且加入量越大,抑制作用越强.与氨基酸相比,LMWOA对土壤吸附菲的抑制作用更强,具体抑制作用大小顺序为:草酸>柠檬酸>苹果酸>>丙氨酸>丝氨酸.试验同时分析了黄棕壤吸附菲平衡溶液中水溶性有机质(DOM)的浓度,发现加入LMWOA或氨基酸后土壤固相有机质含量略有降低(<0.66%),而DOM浓度增大,DOM与菲的结合作用对土壤吸附菲的抑制作用增强,这是供试根系分泌物抑制土壤吸附菲的主要原因.

关键词：根系分泌物多环芳烃(PAHs) 低分子量有机酸氨基酸土壤吸附