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Upgrading waste NO_(x) into amino acids via electrocatalysis on Co nanoparticles encapsulated in hollow carbon nanofibers

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Science China Chemistry 2024年第6期67卷 1946-1952页

作者： Jiahui Xian Kaixing cai Peisen liao Shihan Wang Guangqin Li Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education LIFMIGCMESchool of ChemistrySun Yat-Sen UniversityGuangzhou510275China

Electrocatalytic conversion of waste nitrogen oxide(NO_(x))into value-added nitrogenous chemicals,especially amino acid,is an emerging strategy to alleviate NO_(x)***,this process suffers from the coexistence of multiple competitive reactions leading to complex product distribution and low efficiency,and thus the rational design and modulation of efficient catalysts remains a formidable ***,well-designed Co nanoparticles encapsulated in hollow carbon nanofiber(CoHCNF)were constructed to promote the amino acid electrosynthesis via dealing waste NO_(x)coupling with biomass-derived keto *** to the rapid reactant diffusion,electron transport and efficient contact with abundant accessible Co catalytic sites stemmed from the unique hollow nanotubular structure,Co-HCNF manifested impressive glycine synthesis performance in one-pot adopting NO as the nitrogen source with Faradaic efficiency(FE)of 41.7%and a corresponding yield rate of 222.3μmol h^(-1)as well as 120 h robust ***,it also demonstrates an excellent performance with the FE of 42.8%for NO_(3)~-solution as the nitrogen ***,this strategy displays a broad universality for the synthesis of other amino *** work not only highlights the importance of hollow-structuring electrocatalyst towards upgrading wasted NO_(x)species into amino acids,but also promotes the further development of electrosynthetic systems for high-valued N-containing organic chemicals.

关键词： electrocatalysis NO_(x)reduction amino acid porous materials hollow structure

A Life-skills-based HIV/AIDS Prevention Education for Rural Students of Primary Schools in China:What Changed? What Have We Learned?

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Biomedical and Environmental Sciences 2010年第5期23卷 409-419页

作者： WEI liao JING-MEI JIANG bin YANG XIN ZENG SU-SU liao Institute of Basic Medical Sciences Chinese Academy of Medical Sciences School of Basic Medicine Peking Union Medical CollegeBeijing 100005China Hainan Center for Disease Control & Prevention Haikou 570203HainanChina Education Department of Hainan Province Haikou 570203HainanChina

Objective To evaluate a four-hour life-skills-based HIV/AIDS prevention curriculum among 5th grade students in rural primary schools of Hainan *** The study included two *** one （September 2006-May 2007） was a pre-post-quasi experimental design;a total of 2 413 students aged 9 to 14 years from fifth grade classes of nine primary schools completed a baseline survey （1 720 students were in the intervention group,693 in the control group）,and over 98% of them took part in a short *** experimental curriculum was provided to the intervention *** stage two （September 2008）,a cross-sectional questionnaire was administered to 6 923 students in 7th grade classes of eight middle schools in the same study *** were 1 437 students in the intervention group when the curriculum was *** Students tended to score higher in areas of HIV/AIDS related knowledge and attitudes,if they were younger than average,lived in the county seat,had access to the internet,and their parents had completed higher levels of *** analysis showed that,after controlling for characteristics such as family and community factors,the total effects of curriculum on knowledge in the short-term model increased remarkably compared with the baseline,and maintained major contributions to knowledge in the mid-term *** positive effect of knowledge on attitudes was significantly improved in the short-term model as *** A life-skills based curriculum can improve HIV/AIDS related knowledge and self-perceived level of life-skills among primary school students in rural areas in a short time,and these positive effects can still be observed at least 2 years post participation in the curriculum.

关键词： Adolescent HIV/AIDS prevention Life-skills education Effect evaluation Rural area Intervention research

Nanocrystalline ZrO_2 preparation and kinetics research of phase transition

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Rare Metals 2012年第1期31卷 51-57页

作者： Wu, Wenwei cai, Jinchao Wu, Xuehang Li, Yongni liao, Sen School of Chemistry and Chemical Engineering Guangxi University Nanning 530004 China

The precursor of nanocrystalline ZrO2 was synthesized by solid-state reaction at low heat using ZrOCl2·8H2O,and Na2CO3·10H2O as raw *** nanocrystalline ZrO2 was obtained by calcining the *** precursor and its calcined products were characterized using TG/DTA,FT-IR,XRD,and *** results showed that the precursor dried at 353 K was a zirconyl carbonate *** the precursor was calcined at 673 K for 150min,highly crystallization ZrO2 with tetragonal structure (space group P42/nmc (137)) was obtained with a crystallite size of 24 ***,when the precursor was calcined at 1023 K for 150min,highly crystallization ZrO2 with monoclinic structure (space group P21/c (14)) was obtained with a crystallite size of 20 *** mechanism and kinetics of the thermal process of the precursor were studied using DTA and XRD *** on the Kissinger and Arrhenius equation,the values of the activation energies associated with the thermal process of the precursor were determined to be 26.80 and 566.73 kJ·mol-1 for the first and third steps,*** mechanism of ZrO2 phase transition from tetragonal to monoclinic structure is the random nucleation and growth of nuclei reaction.

关键词： inorganic compounds nanocrystalline thermal process kinetics solid-state reaction at low heat

Calculation of propellant gas pressure by simple extended corresponding state principle

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Defence Technology（防务技术） 2016年第2期12卷 86-89页

作者： bin XU San-jiu YING Xin liao School of Chemistry Engineering Nanjing University of Science and Technology

The virial equation can well describe gas state at high temperature and pressure, but the difficulties in virial coefficient calculation limit the use of virial equation. Simple extended corresponding state principle(SE-CSP) is introduced in virial equation. Based on a corresponding state equation, including three characteristic parameters, an extended parameter is introduced to describe the second virial coefficient expressions of main products of propellant gas. The modified SE-CSP second virial coefficient expression was extrapolated based on the virial coefficients experimental temperature, and the second virial coefficients obtained are in good agreement with the experimental data at a low temperature and the theoretical values at high temperature. The maximum pressure in the closed bomb test was calculated with modified SE-CSP virial coefficient expressions with the calculated error of less than 2%, and the error was smaller than the result calculated with the reported values under the same calculation conditions. The modified SE-CSP virial coefficient expression provides a convenient and efficient method for practical virial coefficient calculation without resorting to complicated molecular model design and integral calculation.

关键词：计算结果气体压力对应状态原理第二维里系数推进剂密闭爆发器试验维里方程高温高压

A new kernel method for hyperspectral image feature extraction

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Geo-Spatial Information Science 2017年第4期20卷 309-318页

作者： bin Zhao Lianru Gao Wenzhi liao bing Zhang Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Ringgold Standard Institution Beijing China Department of Telecommunications and Information Processing Ghent University Ghent Belgium

Hyperspectral image provides abundant spectral information for remote discrimination of subtle differences in ground ***,the increasing spectral dimensions,as well as the information redundancy,make the analysis and interpretation of hyperspectral images a *** extraction is a very important step for hyperspectral image *** extraction methods aim at reducing the dimension of data,while preserving as much information as ***,nonlinear feature extraction methods (*** minimum noise fraction (KMNF) transformation) have been reported to benefit many applications of hyperspectral remote sensing,due to their good preservation of high-order structures of the original ***,conventional KMNF or its extensions have some limitations on noise fraction estimation during the feature extraction,and this leads to poor performances for *** paper proposes a novel nonlinear feature extraction method for hyperspectral *** of estimating noise fraction by the nearest neighborhood information (within a sliding window),the proposed method explores the use of image *** approach benefits both noise fraction estimation and information preservation,and enables a significant improvement for *** results on two real hyperspectral images demonstrate the efficiency of the proposed *** to conventional KMNF,the improvements of the method on two hyperspectral image classification are 8 and 11％.This nonlinear feature extraction method can be also applied to other disciplines where high-dimensional data analysis is required.

关键词： Hyperspectral image dimensionality reduction feature extraction image segmentation kernel method

De novo production of 24-epi-ergosterol in bioengineered yeast

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Chinese Journal of Natural Medicines 2023年第5期21卷 321-322页

作者： XU Zi Fei DONG liao-bin State Key Laboratory of Natural Medicines School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjing 211198China

Plant natural products(PNPs),a rich source of structurally unique and functionally diverse bioactive compounds,comprise a large variety of natural product families including alkaloids,terpenoids,and phenylpropanoids[1].PNPs possess a wide range of applications such as antibiotics,analgesics,and antiviral,antimalarial and antineoplastic agents[2,3].Classically,collection of PNPs relies on extraction and purification from natural ***,due to their low amounts in nature,the extraction process is often inefficient and *** synthesis,on the other hand,is difficult due to the stereochemical complexity of *** recent years,advances in synthetic biology have accelerated the process of producing complex PNPs in yeast cell *** cerevisiae(yeast)is charaterized by a wealth of well-established tools available for genetic manipulation,a well-characterized core metabolic network,low cultivation cost,and compatibility with high cell density fermentation[4-7].As a result,*** is increasingly used as a workhorse for enzyme characterization,biosynthetic pathway elucidation[8,9],and de novo production for various highvalue PNPs[10].

关键词： horse compatibility cultivation

Induction of Th1-Type Immune Response by Chitosan Nanoparticles Containing Plasmid DNA Encoding House Dust Mite Allergen Der p2 for Oral Vaccination in Mice

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Cellular & Molecular Immunology 2009年第1期6卷 45-50页

作者： Guoping Li Zhigang Liu bin liao Nanshan Zhong Inflammation ＆ Allergic Disease Lab Affiliated Hospital of Luzhou Medical College Luzhou 646000 Sichuan China Medical College Shenzhen University Shenzhen 518060 GuangdongChina Guangzhou Institute of Respiratory Disease Guangzhou Medical College Guangzhou 510120 Guangdong China

This study was to prepare the chitosan-pDer p 2 nanoparticles and to investigate the effect of chitosan-DNA nanoparticles on immune response in mice by oral delivery of chitosan-DNA nanoparticles. The nanoparticles were synthesized by complexing chitosan with plasmid DNA. The DNA was fully complexed into chitosan-DNA nanoparticles, suggesting a 100% encapsulation efficiency. Chitosan-DNA complex renders a significant protection of the plasmid. No effect on cell viability was observed in both cell types and average cell viability over 100% was obtained. Oral gene delivery with chitosan-DNA nanoparticles can generate a higher level expression of gene in vivo. Oral chitosan-pDer p 2 nanoparticles in BALB/c mice can induce IFN-γ in serum and prevent subsequent sensitization of Th2 cell-regulated specific IgE responses. The data indicate that the oral administration of chitosan-pDer p 2 nanoparticles results in the expression of Der p 2 in the epithelial cells of both stomach and small intestine and the induction of Th1-type immune response. Cellular ＆ Molecular Immunology.

关键词： dermatophagoides pteronyssinus DNA vaccine chitosan nanoparticle

Decolorization of azo dyes by a salt-tolerant Staphylococcus cohnii strain isolated from textile wastewater

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Frontiers of Environmental Science & Engineering 2012年第6期6卷 806-814页

作者： bin YAN Cuihong DU Meilan XU Wenchao liao Department of Environmental Engineering Xiamen University of TechnologyXiamen 361024China School of Biotechnology Engineering Jimei UniversityXiamen 361021China

The salt-tolerant Staphylococcus cohnii strain, isolated from textile wastewater, has been found effective on decolorizing several kinds of azo dyes with different structures. The optimal conditions for azo dye acid red B （ARB） decolorization by S. cohnii were determined to be pH= 7.0 and 30℃. The decolorization efficiency increased with the increase of the salinity concentration, and around 90% of ARB （100mg.L-1） could be decolorized in 24 h when the salinity concentration was up to 50 g-L 1. Moreover, the strain could still decolorize 19% of ARB in 24 h even when the NaC1 concentration was increased to 150 g. L1. Meanwhile, the dependence of the specific decolorization rate by S. cohnii on the ARB concentration could be described with Michaelis-Menten kinetics （Kin = 585.7mg·L-1, Vmax = t09.8mg-g cell ·h ^-1）. The addition of quinone redox mediator, named 2-hydroxy-l,4-naphthoquinone and anthraqui- none-2,6-disulfonate, significantly accelerated the deco- lorization performance ofS. cohnii. Furtherly, the activities of azoreductase （0.55 μ*** protein^-***-1） and Nicotineamide adenine dinucleotide-dichlorophenol indophenol （NADH-DCIP） reductase （8.9μ*** ***-1） have been observed in the crude cell extracts of S. cohnii. The decolorization products of ARB were analyzed by HPLC-MS, and the results indicated the reductive pathway was responsible for azo dye decoloriza- tion by S. cohnii.

关键词： Staphylococcus cohnii decolorization salt,azoreductase Nicotineamide adenine dinucleotide-dichlor-ophenol indophenol (NADH-DCIP) reductase

An Optimized Vertical Handoff Algorithm Based on Markov Process in Vehicle Heterogeneous Network

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China Communications 2015年第4期12卷 106-116页

作者： MA bin DENG Hong XIE Xianzhong liao Xiaofeng School of Computer Science and Technology Chongqing University of Posts and Telecommunications College of Computer Science Chongqing University

In order to solve the problem the existing vertical handoff algorithms of vehicle heterogeneous wireless network do not consider the diversification of network's status, an optimized vertical handoff algorithm based on markov process is proposed and discussed in this paper. This algorithm takes into account that the status transformation of available network will affect the quality of service(Qo S) of vehicle terminal's communication service. Firstly, Markov process is used to predict the transformation of wireless network's status after the decision via transition probability. Then the weights of evaluating parameters will be determined by fuzzy logic method. Finally, by comparing the total incomes of each wireless network, including handoff decision incomes, handoff execution incomes and communication service incomes after handoff, the optimal network to handoff will be selected. Simulation results show that: the algorithm proposed, compared to the existing algorithm, is able to receive a higher level of load balancing and effectively improves the average blocking rate, packet loss rate and ping-pang effect.

关键词： vehicle heterogeneous network vertical handoff markov process fuzzy logic multi-attribute decision