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Transformation of triclosan by a novel cold-adapted laccase from

Yuanyuan Shi, Deyang Kong, Jiayang Liu, Junhe Lu, Xiaoming Yin, Quansuo Zhou

《环境科学与工程前沿(英文)》 2017年 第11卷 第3期 doi: 10.1007/s11783-017-0927-5

摘要: This work investigated the transformation of triclosan (TCS) by laccase produced by a pathogen isolated from rotten tomato. The pathogen was characterized as sp. FQ, belonging to subphylum . The laccase exhibited cold-adaptation with relatively high activity at 20°C. The laccase could effectively transform TCS. Approximately 62% TCS could be removed at dose of 1.0 unit·mL in 120 min. The reaction rate appeared to be to the concentration of the substrate, suggesting the laccase activity remained stable during the reaction. Transformation products of TCS were analyzed by mass spectrometry and it was revealed that TCS dimers were formed via radical coupling pathways. During this process, laccase catalyzed oxidation of TCS to form a radical intermediate is the rate limiting step. However, this step can be reversed by humic acid. Overall, the laccase showed great potential in the treatment of phenolic contaminants. Since laccase is widely presented in natural environment, this study also revealed an important pathway involved in the transformation of phenolic contaminants in the environment.

关键词: Laccase     Botrytis cinerea     Triclosan     Transformation     Kinetics    

FOOD SYSTEMS TRANSFORMATION: CONCEPTS, MECHANISMS AND PRACTICES

《农业科学与工程前沿(英文)》 2023年 第10卷 第1期   页码 1-3 doi: 10.15302/J-FASE-2023491

摘要: FOOD SYSTEMS TRANSFORMATION: CONCEPTS, MECHANISMS AND PRACTICES

关键词: TRANSFORMATION     SYSTEMS     FOOD     CONCEPTS     MECHANISMS    

TRANSFORMATION OF FOOD SYSTEMS: HOW CAN IT BE FINANCED?

《农业科学与工程前沿(英文)》 2023年 第10卷 第1期   页码 109-123 doi: 10.15302/J-FASE-2023483

摘要:

● The analysis of financing for the transformation of food systems requires first a consideration of costs.

关键词: financial markets     food systems     development financing     consumer expenditures     public budgets     Sustainable Development Goals    

The transformation of PAHs in the sewage sludge incineration treatment

Hui ZHANG,Le XU,Yifei ZHANG,Mengchan JIANG

《环境科学与工程前沿(英文)》 2016年 第10卷 第2期   页码 336-340 doi: 10.1007/s11783-014-0766-6

摘要: The release of pollutants from sewage sludge in the treatment process is a worldwide tricky problem in the field of sludge treatment. In this paper, the release and reaction between monomers of polycyclic aromatic hydrocarbons (PAHs) in the sewage sludge incineration treatment were studied based on simulated experiments. The result indicates that the transformation may occurre between monomers of PAHs during their release in the treatment. Over 90% of total PAHs in sewage sludge are released at the the temperature of 300°C–750°C. The possible transformation of Naphthalene to indeno(1, 2, 3-cd)pyrene was related to the temperature of the treatment system. Here, we showed that the output rate of transformation reactions for indeno(1, 2, 3-cd)pyrene is 94% at 300°C. These findings, by identifying corresponding treatment conditions as well as techniques, can help to understand the reactions and control real outputs of PAHs in the treatment process.

关键词: release of monomers     transformation of monomers     PAHs     sewage sludge     incineration treatment    

面向数字化转型的“互联网 +”战略升级研究

何伟,张伟东,王超贤

《中国工程科学》 2020年 第22卷 第4期   页码 10-17 doi: 10.15302/J-SSCAE-2020.04.002

摘要:

“互联网 +”行动计划推出5年来,新一代信息技术创新进一步加快,经济社会数字化转型呈现诸多新特征,这就要求深入研究构建转型新体系和探索转型新路径,谋划“互联网 +”行动举措演进升级。本文遵循技术产业变革的客观规律,基于技术经济理论范式,着重分析了当前技术、应用和政策等层面数字化转型新态势和转型前沿实践探索。研究表明,当前数字化转型技术体系和技术能力日益完善,新的转型目标蓝图逐步显现,信息技术和实体经济融合进入新阶段,面临着重构数字化转型框架体系,强化转型关键要素、突破转型关键环节的重要任务。对此建议,在“互联网 +”行动后续政策设计、国家“十四五”规划制定的过程中,发掘数字化要素潜力,推动数字化转型生态建设,构建转型创新网络,升级“互联网 +”政策保障体系,推动经济社会数字化转型迈向更高发展水平。

关键词: 技术产业变革     数字化转型     互联网+     产业升级    

Crystal-to-crystal transformation from the triclinic to the cubic crystal system by partial desolvation

Qianqian Guo, Irmgard Kalf, Ulli Englert

《化学科学与工程前沿(英文)》 2018年 第12卷 第3期   页码 433-439 doi: 10.1007/s11705-018-1743-6

摘要:

Diffusion reaction of the labile building block Mg(acacCN)2 (acacCN= 3-cyanoacetylacetonate) with silver salts leads to a series of solvated Mg/Ag bimetallic coordination polymers with composition [Mg(acacCN)3Ag]·solvent. Despite their common stoichiometry, the topology of these polymers depends on the solvent of crystallization. The two-dimensional coordination compound [Mg(acacCN)3Ag]·4CHCl3 in space group P1‾ is obtained as platelet-shaped crystals from a mixture of methanol and chloroform. When kept in the reaction mixture, these thin plates within one week convert to isometric tetrahedral crystals of the 3D network [Mg(acacCN)3Ag]·2CHCl3 in the cubic space group P213. The transformation reaction proceeds via dissolution and recrystallization. The co-crystallized solvent molecules play an important role for stabilizing the target structure: They subtend Cl···Cl contacts and interact via non-classical C–H···O hydrogen bonds with the coordination framework. In the new cubic coordination network, both Mg(II) and Ag(I) adopt octahedral coordination, with unprecedented face-sharing by bridging O atoms of three acetylacetonato moieties. Prolonged standing of [Mg(acacCN)3Ag]·2CHCl3 in the reaction medium leads to further degradation, under formation of [Ag(acacCN)].

关键词: ditopic ligand     substituted acetylacetone     desolvation     diffraction    

Polymorphism and crystal transformation of penicillin sulfoxide

Dingding JING, Yongli WANG, Zhijian CHEN, Lina ZHOU, Jingkang WANG

《化学科学与工程前沿(英文)》 2011年 第5卷 第4期   页码 442-447 doi: 10.1007/s11705-011-1140-x

摘要: Penicillin sulfoxide is the intermediate for the synthesis of 7-amino-3-desacetoxycephalosporanic acid which is one of the most important nucleuses of cephalosporin antibiotic. In this contribution, two crystal structures of penicillin sulfoxide (forms I and II) were determined by X-ray diffraction, and their thermotropic properties were investigated by differential scanning calorimetry (DSC). Furthermore, the transformation of form II to form I was studied quantitatively by Raman spectroscopy, and its rates at different temperatures were determined. The results indicate that penicillin sulfoxide is more stable as form I, and the temperature plays an important role in the crystal transformation.

关键词: penicillin sulfoxide     crystallization     polymorphism     crystal transformation     Raman spectroscopy    

A comprehensive simulation approach for pollutant bio-transformation in the gravity sewer

Nan Zhao, Huu Hao Ngo, Yuyou Li, Xiaochang Wang, Lei Yang, Pengkang Jin, Guangxi Sun

《环境科学与工程前沿(英文)》 2019年 第13卷 第4期 doi: 10.1007/s11783-019-1144-1

摘要:

A comprehensive pollutant transformation model for sewer systems is established.

The model comprises fermentation, sulfate reduction and ammonification processes.

Biochemical reactions related to distinct carbon sources are depicted in the model.

Pollutant transformation is attributed to different biochemical reaction processes.

关键词: Gravity sewer     Modeling     Pollutant transformation     Biochemical reaction process    

Can industrial intelligence promote industrial transformation? ––Case of mining enterprises

Anlin SHAO

《工程管理前沿(英文)》 2017年 第4卷 第3期   页码 375-378 doi: 10.15302/J-FEM-2017108

digestate humification and identification of substances governing the dissolved organic matter (DOM) transformation

《环境科学与工程前沿(英文)》 2022年 第16卷 第8期 doi: 10.1007/s11783-022-1520-0

摘要:

• Liquid digestate humification was investigated under different oxidizing environment.

关键词: Liquid digestate     MnO2     Oxygen     DOM transformation     Humic-like acids    

我国汽车产业转型升级研究

乔英俊,延建林,钟志华,赵俊玮

《中国工程科学》 2019年 第21卷 第3期   页码 41-46 doi: 10.15302/J-SSCAE-2019.03.001

摘要:

本文全面分析了当前我国汽车产业发展面临的新形势和未来发展的新趋向,研究提出了我国汽车产业转型升级的新内涵,即:新材料、新结构、新工艺、新装备、新能源、新功能、新模式,并分析比较了我国汽车产业转型升级的四种新路径,即自主技术创新、跨界联合发展、政策资源支持、创新商业模式,最后提出了相应的发展建议。

关键词: 汽车产业     转型升级     路径分析    

Integrated risk assessment framework for transformation products of emerging contaminants: what we know

《环境科学与工程前沿(英文)》 2023年 第17卷 第7期 doi: 10.1007/s11783-023-1691-3

摘要:

● A better risk assessment can combine the improved non-target analysis method.

关键词: Risk assessment frameworks     Transformation products     Emerging contaminants     High-throughput toxicity screening     Water treatment    

大直径盾构刀盘改造竖井施工技术

王振飞,何峰,贺善宁

《中国工程科学》 2010年 第12卷 第12期   页码 103-107

摘要:

以北京地下直径线盾构的刀盘改造竖井施工为例,针对复杂边界条件下大直径盾构刀盘改造异性结构竖井的设计及施工进行探讨,就如何保证竖井结构安全,同时又能合理协调盾构施工进行了实践探索,并给出了可靠的解决措施,取得了成功,为类似工程提供参考借鉴。

关键词: 大直径盾构     改造竖井     复杂条件    

Thinking and practice of accelerating transformation of traditional Chinese medicine from experience

Baoyan Liu, Yanhong Zhang, Jingqing Hu, Liyun He, Xuezhong Zhou

《医学前沿(英文)》 2011年 第5卷 第2期   页码 163-170 doi: 10.1007/s11684-011-0143-9

摘要: The gradual development of Chinese medicine is based on constant accumulation and summary of experience in clinical practice, but without the benefit of undergoing the experimental medicine stage. Although Chinese medicine has formed a systematic and unique theory system through thousands of years, with the development of evidence-based medicine, the bondage of the research methods of experience medicine to Chinese medicine is appearing. The rapid transition and transformation from experience medicine to evidence-based medicine have become important content in the development of Chinese medicine. According to the features of Chinese medicine, we propose the research idea of “taking two ways simultaneously,” which is the study both in the ideal condition and in the real world. Analyzing and constructing the theoretical basis and methodology of clinical research in the real world, and building the stage for research technique is key to the effective clinical research of Chinese medicine. Only by gradually maturing and completing the clinical research methods of the real world could we realize “taking two ways simultaneously” and complementing each other, continuously produce scientific and reliable evidence of Chinese medicine, as well as transform and develop Chinese medicine from experience medicine to evidence-based medicine.

关键词: Chinese medicine     experience medicine     evidence-based medicine     real world    

Phosphorus transformation under the influence of aluminum, organic carbon, and dissolved oxygen at the

Ouchen Cai, Yuanxiao Xiong, Haijun Yang, Jinyong Liu, Hui Wang

《环境科学与工程前沿(英文)》 2020年 第14卷 第3期 doi: 10.1007/s11783-020-1227-z

摘要: The three simulation factors caused various changes in both water and sediment. Responses to simulations differed with the reported natural lakes and wetlands. Al has dominant effects on sediment P release control among the three factors. Adding sediment Al can be effective and safe under the simulated conditions. Polyphosphates were not generated, while added phytate was rather stable. The effects of sediment aluminum (Al), organic carbon (OC), and dissolved oxygen (DO) on phosphorus (P) transformation, at the water-sediment interface of a eutrophic constructed lake, were investigated via a series of simulative experiments. The above three factors had various influences on dissolved P concentration, water pH, water and surface sediment appearance, and P fractions. Additions of Al had the greatest effect on suppressing P release, and the water pH remained alkaline in the water-sediment system under various OC and DO conditions. No dissolution of the added Al was detected. 31P-NMR characterization suggested that OC addition did not promote biological P uptake to polyphosphates under oxic conditions. The simulation result on the added phytate indicated the absence of phytate in the original lake sediment. As compared to the reported natural lakes and wetland, the water-sediment system of the constructed lake responded differently to some simulative conditions. Since Al, OC, and DO can be controlled with engineering methods, the results of this study provide insights for the practical site restorations.

关键词: Phosphorus     Sediment     Simulation     Dissolved oxygen     Organic carbon     Aluminum    

标题 作者 时间 类型 操作

Transformation of triclosan by a novel cold-adapted laccase from

Yuanyuan Shi, Deyang Kong, Jiayang Liu, Junhe Lu, Xiaoming Yin, Quansuo Zhou

期刊论文

FOOD SYSTEMS TRANSFORMATION: CONCEPTS, MECHANISMS AND PRACTICES

期刊论文

TRANSFORMATION OF FOOD SYSTEMS: HOW CAN IT BE FINANCED?

期刊论文

The transformation of PAHs in the sewage sludge incineration treatment

Hui ZHANG,Le XU,Yifei ZHANG,Mengchan JIANG

期刊论文

面向数字化转型的“互联网 +”战略升级研究

何伟,张伟东,王超贤

期刊论文

Crystal-to-crystal transformation from the triclinic to the cubic crystal system by partial desolvation

Qianqian Guo, Irmgard Kalf, Ulli Englert

期刊论文

Polymorphism and crystal transformation of penicillin sulfoxide

Dingding JING, Yongli WANG, Zhijian CHEN, Lina ZHOU, Jingkang WANG

期刊论文

A comprehensive simulation approach for pollutant bio-transformation in the gravity sewer

Nan Zhao, Huu Hao Ngo, Yuyou Li, Xiaochang Wang, Lei Yang, Pengkang Jin, Guangxi Sun

期刊论文

Can industrial intelligence promote industrial transformation? ––Case of mining enterprises

Anlin SHAO

期刊论文

digestate humification and identification of substances governing the dissolved organic matter (DOM) transformation

期刊论文

我国汽车产业转型升级研究

乔英俊,延建林,钟志华,赵俊玮

期刊论文

Integrated risk assessment framework for transformation products of emerging contaminants: what we know

期刊论文

大直径盾构刀盘改造竖井施工技术

王振飞,何峰,贺善宁

期刊论文

Thinking and practice of accelerating transformation of traditional Chinese medicine from experience

Baoyan Liu, Yanhong Zhang, Jingqing Hu, Liyun He, Xuezhong Zhou

期刊论文

Phosphorus transformation under the influence of aluminum, organic carbon, and dissolved oxygen at the

Ouchen Cai, Yuanxiao Xiong, Haijun Yang, Jinyong Liu, Hui Wang

期刊论文