检索结果-内蒙古大学图书馆

A novel remediation strategy of mixed calcium peroxide and degrading bacteria for polycyclic aromatic hydrocarbon contaminated water

引用

JOURNAL OF HAZARDOUS MATERIALS 2024年 470卷 134122页

作者： Tang, Lei Sun, Yulong Lu, Wenyi chen, xuwen Mosa, Ahmed Minkina, Tatiana Gao, Yanzheng Ling, Wanting Nanjing Agr Univ Inst Organ Contaminant Control & Soil Remediat Coll Resources & Environm Sci Nanjing 210095 Peoples R China Mansoura Univ Fac Agr Soils Dept Mansoura 35516 Egypt Southern Fed Univ Acad Biol & Biotechnol Rostov Na Donu 344090 Russia

Polycyclic aromatic hydrocarbons (PAHs) are a class of toxic organic pollutants commonly detected in the aqueous phase. Traditional biodegradation is inefficient and advanced oxidation technologies are expensive. In the current study, a novel strategy was developed using calcium peroxide (CP) and PAH-degrading bacteria (PDB) to effectively augment PAH degradation by 28.62 - 59.22%. The PDB consisted of the genera Acinetobacter , Stenotrophomonas, and Comamonas . Applying the response surface model (RSM), the most appropriate parameters were identified, and the predictive degradation rates of phenanthrene (Phe), pyrene (Pyr), and Sigma PAHs were 98%, 76%, and 84%, respectively. The constructed mixed system could reduce 90% of Phe and more than 60% of Sigma PAHs and will perform better at pH 5 - 7 and lower salinity. Because PAHs tend to bind to dissolved organic matter (DOM) with larger molecular weights, humic acid (HA) had a larger negative effect on the PAHdegradation efficiency of the CP-PDB mixed system than fulvic acid (FA). The proposed PAH-degradation pathways in the mixed system were based on the detection of intermediates at different times. The investigation constructed and optimized a novel environmental PAH-degradation strategy. The synergistic application of PDB and oxidation was extended for organic contaminant degradation in aqueous environments.

关键词： Polycyclic aromatic hydrocarbons Biodegradation effect Oxidation degradation Mixed degradation strategy

来源：评论

学校读者我要写书评

暂无评论

Distribution of bound-PAH residues and their correlations with the bacterial community at different depths of soil from an abandoned chemical plant site

引用

JOURNAL OF HAZARDOUS MATERIALS 2023年第1期453卷 131328页

作者： Tang, Lei Zhao, Xuqiang chen, xuwen Jiang, Yi Gudda, Fredrick Wang, Yunhao Ling, Wanting Nanjing Agr Univ Coll Resources & Environm Sci Inst Organ Contaminant Control & Soil Remediat Nanjing 210095 Peoples R China Huazhong Agr Univ Coll Resources & Environm State Key Lab Agr Microbiol Wuhan 430070 Peoples R China

The situ pollutant residue and microbial characteristics in contaminated environments are crucial for ecological restoration and soil utilization. This work reported the variation of polycyclic aromatic hydrocarbon (PAH) residues and the bacterial community at different depths in an aged-abandoned site. These results unveiled that over 90% of low molecular weight (LMW) and medium molecular weight (MMW), 52.84-76.88% of high mo-lecular weight (HMW) bound-PAH (BP) residues were sequestrated in humin (HM). The stresses of PAH and soil depth enhanced the frequency of bacteria associations, especially positive associations. We enriched and cultured PAH degradation bacteria (PDB) from the sampling site mainly consisting of Pseudomonas and Acinetobacter, which were originally 0.39-0.52% abundant in the sampling site. The abundances of PDB and PAH-degradation genes (PDGs) were higher at shallower depths and increased with high PAH concentration. Simultaneously, Pearson correlation analysis and experimental verification found that the process of PAH binding with SOM limited the further increase of PDB and PDGs in PAH-contaminated sites. These findings may illustrate possible ecological risks of contaminated soils and provide guidance for the isolation and application of PDB.

关键词： Vertical distribution PAH residues Bacterial communication Degradation gene Ecosystem risks

来源：评论

学校读者我要写书评

暂无评论

超大型地下空间应急电源选型研究

引用

建筑电气 2023年第1期42卷 13-20页

作者：陈旭文福州市规划设计研究院集团有限公司福州市350108

为保障超大型地下空间消防系统的供电连续性,同时获得全局最优的应急电源设置方案,对三种不同形式的应急电源有针对性地进行全专业的技术指标及经济指标的比较分析。通过分析,确定了适用于超大型地下空间的全局最优应急电源选型方案,即... 详细信息

为保障超大型地下空间消防系统的供电连续性,同时获得全局最优的应急电源设置方案,对三种不同形式的应急电源有针对性地进行全专业的技术指标及经济指标的比较分析。通过分析,确定了适用于超大型地下空间的全局最优应急电源选型方案,即采用10 kV中压柴油发电机组作为全场公共空间的应急电源,同时根据新版标准ISO 8528-1:2018《Reciprocating internal combustion engine driven alternating current generating sets—Part 1:Application,ratings and performance》及GB/T 2820.1-2009/ISO 8528-1:2005《往复式内燃机驱动的交流发电机组第1部分:用途、定额和性能》要求,对柴油发电机组的功率选型作详细阐述,厘清国标功率与设备铭牌功率之间的关系。

关键词：超大型地下空间应急电源选型柴油发电机组蓄电池组专用市电供电可靠性技术指标经济指标功率选择

来源：评论

学校读者我要写书评

暂无评论

木结构历史文化街区保护修复中的防雷接地研究

引用

建筑电气 2023年第8期42卷 53-59页

作者：陈旭文福州市规划设计研究院集团有限公司福州市350108

根据木结构历史建筑本身的特点,对其防雷分类,年预计雷击次数计算,接闪器、防雷引下线及接地装置设置等进行研究分析,并给出相应的设置原则。同时,以福州市南公河口历史文化街区的保护修缮工作为例,在确保该历史文化街区建筑安全、人身... 详细信息

根据木结构历史建筑本身的特点,对其防雷分类,年预计雷击次数计算,接闪器、防雷引下线及接地装置设置等进行研究分析,并给出相应的设置原则。同时,以福州市南公河口历史文化街区的保护修缮工作为例,在确保该历史文化街区建筑安全、人身安全及环境安全的前提下,按最少干预及不破坏建筑的整体风貌原则提出相应可行的实施方案。

关键词：防雷接地木结构建筑历史文化街区保护修复引下线接闪器接地网防雷分类

来源：评论

学校读者我要写书评

暂无评论

Danshensu inhibits SARS-CoV-2 by targeting its main protease as a specific covalent inhibitor and discovery of bifunctional compounds eliciting antiviral and anti-inflammatory activity

引用

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES 2024年第Part2期257卷 128623页

作者： Wang, Ruyu chen, xuwen Li, Hongtao chen, Xixiang Sun, Donghui Yu, Danmei Lu, Jiani Xie, Yuanyuan Zhang, Qian Xu, Jianrong Zhang, Weidong chen, Hongzhuan Liu, Shunying chen, Lili Shanghai Univ Tradit Chinese Med Inst Interdisciplinary Integrat Med Res Shanghai Frontiers Sci Ctr TCM Chem Biol Shanghai Peoples R China East China Normal Univ Shanghai Engn Res Ctr Mol Therapeut & New Drug Dev Sch Chem & Mol Engn Shanghai 200062 Peoples R China Shanghai Univ Tradit Chinese Med Acad Integrat Med 1200 Cailun Rd Shanghai 201203 Peoples R China Fudan Univ Sch Pharm Dept Med Chem Shanghai 201203 Peoples R China Shanghai Univ Tradit Chinese Med Shanghai Inst Infect Dis & Biosafety Inst Interdisciplinary Integrat Med Res Shanghai 201203 Peoples R China Shanghai Univ Tradit Chinese Med Inst Interdisciplinary Integrat Med Res Shanghai 201203 Peoples R China

The coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has posed a serious threat to human. Since there are still no effective treatment options against the new emerging variants of SARS-CoV-2, it is necessary to devote a continuous endeavor for more targeted drugs and the preparation for the next pandemic. Salvia miltiorrhiza and its active ingredients possess wide antiviral ac-tivities, including against SARS-CoV-2. Danshensu, as one of the most important active ingredients in Salvia miltiorrhiza, has been reported to inhibit the entry of SARS-CoV-2 into ACE2 (angiotensin-converting enzyme 2)-overexpressed HEK-293T cells and Vero-E6 cells. However, there is a paucity of information regarding its detailed target and mechanism against SARS-CoV-2. Here, we present Danshensu as a covalent inhibitor of 3-chymotrypsin-like protease (3CLpro) against SARS-CoV-2 by the time-dependent inhibition assay (TDI) and mass spectrometry analysis. Further molecular docking, site-directed mutagenesis, circular dichroism (CD) and fluorescence spectra revealed that Danshensu covalently binds to C145 of SARS-CoV-2 3CLpro, meanwhile forming the hydrogen bonds with S144, H163 and E166 in the S1 site. Structure-based optimization of Danshensu led to the discovery of the promising compounds with good inhibitory activity and microsomal stability in vitro. Due to Danshensu inhibiting lung inflammation in the mouse model, we found that Danshensu derivatives also showed better anti-inflammatory activity than Danshensu in lipopolysaccharide (LPS)-stimulated RAW264.7 macrophage cells. Thus, our study provides not only the clue of the efficacy of Salvia miltiorrhiza against SARS-CoV-2, but also a detailed mechanistic insight into the covalent mode of action of Danshensu for design of co-valent inhibitors against SARS-CoV-2 3CLpro, highlighting its potential as a bifunctional molecule with antivirus and anti-inflammation.

关键词： Danshensu SARS-CoV-23CLpro Covalent inhibitor Anti-inflammation Bifunctional molecule

来源：评论

学校读者我要写书评

暂无评论

Co-sorption of phthalate esters and Cd2+ on biochar-sulfhydryl modified montmorillonite composites

引用

Journal of Hazardous Materials 2025年 494卷 138526页

作者： Li, Wenjie Mao, Pengfei chen, xuwen Ling, Wanting Qin, Chao Gao, Yanzheng Institute of Organic Contaminant Control and Soil Remediation College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing210095 China

Developing efficient passivating sorption materials for the treatment of combined pollution by phthalate esters (PAEs) and Cd2+ has become a critical focus in environmental protection and soil remediation. In this study, biochar-sulfhydryl modified montmorillonite composites (BC-SHMMT) were synthesized, characterized, and evaluated for the co-sorption of PAEs (DMP, DEP) and Cd2+. The integration of sulfhydryl-modified montmorillonite (MMT-SH) with biochar improved the material's surface structure, enhancing both co-sorption capacity and structural stability. Molecular dynamics simulation indicated a monolayer chemical sorption of pollutants by BC-SHMMT, in alignment with the sorption theoretical model. In the co-sorption system, the coexistence of pollutants increased the adsorption of Cd2+ and decreased the sorption of PAEs. The smaller molecular size and higher diffusion coefficient of Cd2+ facilitated its pore filling and interaction with oxygen-containing functional groups of the material, leading to competition with PAEs for sorption sites. Notably, the ion exchange and complexation of Cd2+ adsorption by MMT-SH are pivotal in enhancing BC-SHMMT co-sorption capacity. These findings provide valuable insights into the development of eco-friendly novel materials and the improvement of co-pollution remediation efficiency. © 2025 Elsevier B.V.

关键词： Absorbance

来源：评论

学校读者我要写书评

暂无评论

气浮隔振平台特性测试方法的研究

引用

机床与液压 2023年第23期51卷 92-96页

作者：徐新云陈旭雯陈章位浙江大学机械工程学院浙江杭州310058 杭州亿恒科技有限公司浙江杭州310013

针对气浮隔振平台的振动隔离特性评估,建立隔振平台的力学模型,获得刚度-阻尼并联的两参数模型的传递特性。设计一套微振动测量评估系统,测量流程为:冲击锤激励隔振平台,低频微振动加速度传感器测量地面和隔振台面微小振动加速度值,MI-7... 详细信息

针对气浮隔振平台的振动隔离特性评估,建立隔振平台的力学模型,获得刚度-阻尼并联的两参数模型的传递特性。设计一套微振动测量评估系统,测量流程为:冲击锤激励隔振平台,低频微振动加速度传感器测量地面和隔振台面微小振动加速度值,MI-7208型智能便携式数据采集仪实时采集振动数据,通过配套的专业隔振平台特性分析软件处理得到隔振平台的固有频率和隔振效果等指标。试验结果表明:气浮隔振平台振动衰减可达25 dB;其水平和垂直方向固有频率均在2 Hz附近,与设计参数吻合。

关键词：微振动测量气浮隔振平台隔振效果固有频率

来源：评论

学校读者我要写书评

暂无评论

QUANTITATIVE DERIVATION AND SCATTERING OF THE 3D CUBIC NLS IN THE ENERGY SPACE

arXiv

引用

arXiv 2021年

作者： chen, xuwen Holmer, Justin Department of Mathematics University of Rochester RochesterNY14627 United States Department of Mathematics Brown University 151 Thayer Street ProvidenceRI02912 United States

We consider the derivation of the defocusing cubic nonlinear Schrödinger equation (NLS) on 3 from quantum N-body dynamics. We reformat the hierarchy approach with Klainerman-Machedon theory and prove a bi-scattering theorem for the NLS to obtain convergence rate estimates under H1 regularity. The H1 convergence rate estimate we obtain is almost optimal for H1 datum, and immediately improves if we have any extra regularity on the limiting initial one-particle state. Copyright © 2021, The Authors. All rights reserved.

关键词： Nonlinear equations

来源：评论

学校读者我要写书评

暂无评论

Improving the non-radical/radical transformation efficiency of halogenated polycyclic aromatic hydrocarbons by using metal ion-exchanged cryptomelane-type OMS-2 under moisture-unsaturated conditions

引用

JOURNAL OF CLEANER PRODUCTION 2023年第1期405卷

作者： cheng, Pengfei Zhao, Xuqiang chen, xuwen Czech, Bozena Oleszczuk, Patryk Ma, Junchao Zhou, Xian Gao, Yanzheng Nanjing Agr Univ Inst Organ Contaminant Control & Soil Remediat Coll Resources & Environm Sci Nanjing 210095 Peoples R China Jiangsu Univ Inst Environm Hlth & Ecol Secur Sch Environm & Safety Engn Zhenjiang 212013 Jiangsu Peoples R China Marie Curie Sklodowska Univ Inst Chem Sci Dept Radiochem & Environm Chem Fac Chem Pl M Curie Sklodowskiej 3 541 PL-20031 Lublin Poland

Halogenated polycyclic aromatic hydrocarbons (HPAHs) have recently remerged as major soil contaminants. However, limited studies have focused on the transformation and removal of HPAHs in soils. The transformation behaviors of HPAHs on cryptomelane-type manganese oxide (K(I)-OMS-2) and its metal ion-exchanged M-OMS-2 (M = Fe(III), Cu(II), and Zn(II)) under moisture-unsaturated conditions were systematically investigated. The transformation kinetics results showed that the transformation rate constants (k) of HPAHs were 0.077-0.829, 0.071-0.629, 0.068-0.530, and 0.064-0.259 d(-1) for Fe(III)-OMS-2, Cu(II)-OMS-2, Zn(II)-OMS-2, and K(I)-OMS-2. The metal ion exchange treatment of K(I)-OMS-2 enhanced the transformation efficiency of HPAHs. The characterization (H-2-TPR, CV, ESI, XPS, and EPR) and theoretical calculation (density of states and formation energy of oxygen vacancies) results indicated that the non-radical/radical transformation efficiency of HPAHs on M-OMS-2 was higher than that on K(I)-OMS-2. The transformation rate of HPAHs was positively correlated with the redox potential of metal ions and superoxide radical yield of M-OMS-2. Additionally, this study revealed that HPAHs with lower redox potential and more strongly bound to M-OMS-2 were more preferentially transformed. Finally, the experimental results of the addition of M-OMS-2 to the natural soil revealed that M-OMS-2 aids the transformation of HPAHs in soils. This study reveals the chemical transformation behavior of HPAHs in soils and suggests that M-OMS-2 can a promising agent for soil remediation.

关键词： Halogenated polycyclic aromatic hydrocarbons OMS-2 Moisture-unsaturated conditions Metal ion exchange Transformation

来源：评论

学校读者我要写书评

暂无评论

Degradation of bisphenol A in an oxidation system constructed from Mo2C MXene and peroxymonosulfate

引用

NPJ CLEAN WATER 2022年第1期5卷 66页

作者： chen, xuwen Gudda, Fredrick Owino Hu, Xiaojie Waigi, Michael Gatheru Gao, Yanzheng Nanjing Agr Univ Inst Organ Contaminant Control & Soil Remediat Coll Resources & Environm Sci Nanjing 210095 Peoples R China

The etched Mo2C MXene with a layered structure was characterized as an environmentally friendly catalyst in the bisphenol A (BPA) removal by advanced oxidation. 99.75% of BPA was degraded in the oxidation system constructed using Mo2C MXene and peroxymonosulfate (PMS). The Mo2C MXene was recyclable, with a high removal percentage (89.29%) of BPA after even four cycles. The catalysis of Mo2C MXene on PMS was due to the Mo-deficit vacancy defects. The electron paramagnetic resonance technique and density functional theory (DFT)-based density of states calculations verified defect signals. In addition, the defective Mo2C MXene and PMS have strong binding and electron transfer capabilities. The reactive oxygen species (ROS, including O-2(center dot -), O-1(2), SO4 center dot , and (OH)-O-center dot ) produced by Mo2C MXene activates PMS, leading to BPA degradation. The condensed Fukui function predicted the active sites of the BPA molecule and found that the O1, O2, C3, C4, C6, C12, C15, and C16 sites have higher electrophilic reactivity. The C, C-C bonds, or C4/C16 sites in the isopropyl group connecting the two phenolic rings were attacked first, then further transformed BPA into non-toxic or low toxic small molecule degradation products through a series of reactions such as bond-breaking, addition, hydroxylation, and ring-opening. Moreover, the Mo2C MXene/PMS system has strong applicability in actual water bodies. The study provides valuable insights into PMS activation by two-dimensional MXenes to remove toxic organic pollutants in an aqueous matrix.

关键词： Molecules

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：