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Hemin-histamine-montmorillonite clay conjugate as a model biocatalyst to mimic natural peroxidase

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Science China Chemistry 2015年第4期58卷 731-737页

作者： Lihui Zhang cheng Gu Jian xiong Mei Yang Yong Guo State Key Laboratory of Pollution Control & Resource Reuse School of the Environment Nanjing University

We successfully synthesized the first hemin-montmorillonite bio-conjugate with an amino acid residue to mimic natural peroxidase enzyme. Histamine was intercalated in montmorillonite by cation exchange, then a heroin molecule was loaded onto the histamine-montmorillonite with an adsorption capacity of 7.0 mg· g^-1. The hemin-histamine-montmorillonite conjugate shows high peroxidase activity as indicated by the oxidation of guaiacol, which is attributed to the activation of hemin by Fe-N complex formation between the imidazole group in histamine and the iron ion in the hemin molecule. Temperaturedependent peroxidase activity for this synthesized biomimetic material indicates that raising the reaction temperature could significantly enhance the activity of the conjugate. The biomimetic catalyst has good reusability; nearly 100% activity can be retained after three cycles. Because montmorillonite clay is widely distributed in the environment, this material offers great potential for in situ and ex situ remediation of many organic contaminants in surface/subsurface soils.

关键词： hemin-histamine-montmorillonite conjugates imidazole biomimetic catalyst peroxidase activity recycle

A review of the neptis species group of the genus Lilioceris(Coleoptera:Chrysomelidae:Criocerinae)

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Zoological Systematics 2021年第4期46卷 300-316页

作者： Yuan Xu Yun xiong Hongbin liang Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100101China Gongshan Protection Sub-Bureau Gaoligongshan National Nature ReserveGongshan 673500YunnanChina College of Life Science University of Chinese Academy of SciencesBeijing 100049China

A new species group of the genus Lilioceris Reitter,1913 is proposed and keyed as neptis group,characterized by adults with mesoventral process widened,tuberculate,and horizontally connected with *** includes six species:Lilioceris balyi Chujo,1962,*** Heinze,1943 ***.,*** Pic,1932,***(Weise,1922),***(Motschulsky,1861)and *** Medvedev,*** them,Lilioceris cantonensis Heinze,1943 is resurrected as a valid species from synonyms of ***(Weise,1922);*** Pic,1932 is transferred from the subgenus Chujoita Monrós,1959 to the subgenus Lilioceris Reitter,1913;*** Medvedev,1985 is firstly recorded in China;some misidentifications of former literatures for *** are ***(if necessary),habitus photographs,geographic distributions,host plants and habitats(if known)are provided for these species.

关键词： Shining leaf beetle taxonomy key genitalia distribution

Nested case-control study of multiple serological indexes and Brighton pediatric early warming score in predicting death of children with sepsis

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World Journal of Clinical Cases 2019年第4期7卷 431-440页

作者： xiong Xie Ming Li Tian-Tian xiong Rui Wang liang Xiao Department of Pediatrics Third Clinical Hospital China Three Gorges University Gezhouba Central Hospital

BACKGROUND Currently, it is difficult to predict the complications of children at the early stage of sepsis. Brighton pediatric early warning score(PEWS) is a disease risk assessment system that is simple and easy to operate, which has good sensitivity and specificity in disease recognition among children. Because detection indicators vary widely in children, a single indicator is difficult to assess the posttreatment status of children with *** To investigate the relationship between serological markers, Brighton PEWS, and death in children with sepsis after *** A total of 205 children diagnosed with sepsis at our hospital were enrolled. The baseline data, serum scores, and PEWS scores were recorded. In the nested casecontrol study, children who died during the study period were included in an observation group. According to the matching principle, the children who were not dead in the same cohort were included in a control group. The influencing factors of death in children with sepsis after treatment and the value of each evaluation index in predicting the prognosis of children were *** A total of 96 children were enrolled in the study, including 48 each in the observation group and the control group. Multivariate logistic regression analysis indicated that antibacterial treatments within 1 h(P = 0.017), shock(P = 0.044),multiple organ dysfunction syndrome(MODS)(P = 0.027), serum procalcitonin(PCT)(P = 0.047), serum albumin(ALB)(P = 0.024), and PEWS(P = 0.012) were independent risk factors for the death of children with sepsis. The area under the curve of the combination of ALB, PCT, and PEWS to predict the death in children with sepsis was the highest(0.908).CONCLUSION Antibacterial treatments within 1 h, shock, MODS, PCT, ALB, and PEWS are independent risk factors for the death of children with sepsis. The predictive accuracy of the combination of PCT, ALB, and PEWS for the prognosis of children with sepsis is the best.

关键词： Serological indicators Pediatric early warming score Sepsis Nested casecontrol study Systemic inflammatory reaction syndrome

Magnetized strange quark matter in the equivparticle model with both confinement and perturbative interactions

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Nuclear Science and Techniques 2016年第4期27卷 158-166页

作者： cheng Peng Guang-xiong Peng cheng-Jun Xia Jian-Feng Xu Shi-Peng Zhang School of Physics University of Chinese Academy of Sciences Theoretical Physics Center for Science Facilities Institute of High Energy Physics Synergetic Innovation Center for Quantum Effects and Application Hunan Normal University Key Laboratory of Frontiers in Theoretical Physics Institute of Theoretical Physics

We investigated the properties of strange quark matter in an external strong magnetic field with both confinement and leading-order perturbative interactions considered. It was found that the leading-order perturbative interaction can stiffen the equation of state of magnetized quark matter, while the magnetic field lowers the minimum energy per baryon. By solving the Tolman–Oppenheimer–Volkoff equations, we obtain the internal structure of strange stars. The maximum mass of strange stars can be as large as 2 times the solar mass.

关键词：奇异夸克物质微扰磁化 e模型状态方程能量最小奥本海默内部结构

Effect of Counterface Material on Friction and Wear Behavior of Ni-Cr-W-Al-Ti-MoS_2 Composites

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Chinese Journal of Aeronautics 2006年第B12期19卷 74-77页

作者： LI Jian-liang xiong Dang-sheng WAN Yi Department of Materials Science and Engineering Nanfing University of Science and Technology Nanjing 210094 China

Ni-Cr-W-Al-Ti-MoS2 self-lubricating composites were prepared through the powder metallurgy （P/M） method. Their friction properties were investigated by a pin-on-disk tribometer in the range from the room temperature to 600 ℃. Alumina, silicon nitride and nickel-iron-sulfide alloys were selected as the counterface materials. Results indicate that the lowest friction coefficients under 0.22 can be obtained at 600℃ when rubbed against alumina. When rubbed against nickel-iron-sulfide alloys, are presented the lowest wear rates in the magnitude of 10^-6 mm^3/N-m, one order of magnitude lower than those when rubbed against ceramics. In the case of three rubbing pairs, the wear rates of the composite containing MoS2 present themselves inversely proportional to friction coefficients. With alumina ceramics used as a counterface, transfer films and glaze layers will form on the contact surface playing a main role in lubrication at high temperatures. However, when silicon nitride and nickel-iron-sulfide alloy are used, the lubricating transfer films appear not to be prominent.

关键词： powder metallurgy (P/M) high temperature solid lubrication Ni-based composite

MOF-derived Cu based materials as highly active catalysts for improving hydrogen storage performance of Mg-Ni-La-Y alloys

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Chinese Chemical Letters 2024年第12期35卷 555-561页

作者： Yufei Liu liang xiong Bingyang Gao Qingyun Shi Ying Wang Zhiya Han Zhenhua Zhang Zhaowei Ma Limin Wang Yong cheng State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences School of Applied Chemistry and Engineering University of Science and Technology of China (USTC) Purification Equipment Research Institute of CSIC Shengyuan (Xiamen) Hydrogen Energy Research Institute Co. Ltd.

Higher initial （de）hydrogenation temperature and sluggish kinetics are the main bottlenecks to develop Mg-based hydrogen storage alloys with high hydrogen *** of the effective methods of solv ing these problems is introducing additives to enhance （de）hydrogenation kinetics and decrease par ticle sizes to lower （de）hydrogenation *** this work,Mg85-Ni10-La4.5-Y0.5 alloy doped with Cu@C nanoparticles is prepared,which could enhance （de）hydrogenation kinetics via introducing Cu nanoparticles as a catalyst and reduce the alloy particle sizes via acting as a grinding agent to lowe（de）hydrogenation *** results indicate the dehydrogenation temperature of the modified Mg85-Ni10-La4.5-Y0.5 composite could be decreased to 308.5°C,absorb 4.73 wt% H2at 220°C within1 min and release 5.01 wt% H2within 4 min at 300°***,the capacity retention could be main tained around 98.8% after 10 cycles at 300°C,superior than those of Mg85-Ni10-La4.5-Y0.5 and milled *** results and characterizations suggest that in-situ formed Mg2Cu could acceler ate the dissociation of Mg-H bonds and the presence of amorphous carbon in Mg-Ni-La-Y-Cu system wil further synergistically improve the （de）hydrogenation kinetics of *** particle sizes under the aid of carbon frameworks also help introduce boundaries of the particles and shorten hydrogen diffusion pathways.

关键词： Mg-Ni-La-Y alloy Cu@C Catalyst Kinetics Hydrogen storage

Antarctic Ice-Sheet Freeze-Thaw Detection Based on Improved Physical Model

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Chinese Journal of Electronics 2014年第1期23卷 209-212页

作者： xiong Zhangqiang WANG Xingdong LI Xinwu liang Lei Key Laboratory of Metallogenic Prediction of Nonferrous Metals Ministry of Education School of Geosciences and Info-Physics Central South University Institute of Remote sensing and Digital Earth Chinese Academy of Sciences

On the basis of the simple ice-sheet freezethaw physical model, a new algorithm of Antarctic icesheet freeze-thaw detection was proposed for the automatic threshold segmentation, which did not depend on the priori freeze-thaw distribution. That was the histogram statistics for the data of ice-sheet freeze-thaw physical model by the use of generalized Gaussian model to automatically get the optimal threshold of the dry snow and the wet snow, so as to get the Antarctic freeze-thaw areas. The algorithm improves the computational efficiency, usability and operability of the ice-sheet freeze-thaw detection because the algorithm does not rely on the actual melt information and can automatically select many samples. To some extent,the algorithm also improves the accuracy of the ice-sheet freeze-thaw detection.

关键词： Ice-sheet freeze-thaw detection Microwave radiometer Physical model Generalized Gaussian model

Decomposition Temperature of Cold Seep Carbonate and its Relationship with Delta Carbonate

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Acta Geologica Sinica(English Edition) 2016年第6期90卷 2271-2272页

作者： ZHAO Jing liang Qianyong LEI Rui xiong Yongqiang Gas Hydrate Engineering Technology Center Guangzhou Marine Geological SurveyChina Geological Survey State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyMinistry of Land and Resources

Delta carbonate （Delta C, AC） method is a commonly- used surface geochemical exploration method for petroleum surveys. Delta C holds that light hydrocarbon gases leak into near-surface soils or sediments from underlying petroleum accumulations, then partly oxidized to CO2, resulting in a special carbonate precipitation, which is termed as Delta carbonate （△C）.

关键词： soil CCO Decomposition Temperature of Cold Seep Carbonate and its Relationship with Delta Carbonate

Microstructure and mechanical behavior of Inconel 625 alloy processed by selective laser melting at high temperature up to 1000℃

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Rare Metals 2020年第10期39卷 1181-1189页

作者： Xiao-An Hu Gao-Le Zhao Fen-cheng Liu Wei-xiong Liu School of Aircraft Engineering Nanchang Hangkong UniversityNanchang 330063China Airbreathing Hypersonic Technology Research Center China Aerodynamic Research and Development CenterMianyang 621000China

Mechanical behavior of Inconel 625 alloy manufactured by selective laser melting(SLM)was experimentally *** tests were performed at various temperatures(20,540,760,815,870,950 and 1000℃).The microstructures and fracture mechanism were investigated using optical microscopy(OM),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The SLM Inconel 625 exhibits excellent plastic deformation at low ***,significant embrittlement for the SLM Inconel 625 was found at elevated temperatures compared to low temperature and traditional forging *** microstructure studies,the non-homogenous microstructure is a key factor causing the intergranular cracking mode at elevated ***,carbides were found to form at the grain boundary at elevated *** carbides could weaken the strength of the grain boundary at elevated temperatures,which decreased the tensile strength and ductility of the alloy processed by SLM.

关键词： Nickel-based superalloy Selective laser melting Embrittlement High temperature Microstructure