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聚乙烯醇与溶菌酶的相互作用及其对溶菌酶构象的影响

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化学学报 2008年第9期66卷 1042-1046页

作者：王改珍贺进田闫慧源周志涛周香莲侯笑娜崔艳河北科技大学环境科学与工程学院石家庄050018 河北师范大学生命科学院石家庄050016

在生理条件下,使用凝胶过滤色谱、荧光光谱法、差示扫描量热分析和傅里叶变换红外光谱法(FT-IR)研究了溶菌酶与聚乙烯醇(PVA)的相互作用.结果表明PVA与溶菌酶结合形成复合物,在它们的相互作用过程中,溶菌酶酪氨酸的发射荧光部分被猝灭,... 详细信息

在生理条件下,使用凝胶过滤色谱、荧光光谱法、差示扫描量热分析和傅里叶变换红外光谱法(FT-IR)研究了溶菌酶与聚乙烯醇(PVA)的相互作用.结果表明PVA与溶菌酶结合形成复合物,在它们的相互作用过程中,溶菌酶酪氨酸的发射荧光部分被猝灭,但是,相互作用并没有改变酪氨酸的微环境;差示扫描量热分析结果表明,溶菌酶与PVA之间的相互作用没有破坏溶菌酶的高级结构;进一步使用红外光谱法结合可增强分辨率的傅里叶去卷积技术和高斯曲线拟合技术共同用于对溶菌酶与PVA复合物冻干粉中溶菌酶酰胺I带的定量分析,发现冻干粉溶菌酶分子中与分子间相互作用相关的β-折叠组分含量减少了,但是,用于衡量冻干状态蛋白质结构完整性的α-螺旋组分含量没有降低.活性分析结果进一步确认,PVA与溶菌酶的相互作用没有破坏溶菌酶的三级结构.

关键词：聚乙烯醇溶菌酶傅里叶变换红外光谱凝胶过滤荧光光谱

Effective resource scheduling scheme considering scheduling relevancy for downlink joint transmission system

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The Journal of China Universities of Posts and Telecommunications 2012年第5期19卷 16-25页

作者： LI xiao-na cui Qi-mei MU Yan-lin TAO xiao-feng Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing 100876China

Coordinated multi-point （CoMP） transmission is a promising technique to improve both cell average and cell edge throughput for long term evolution-advanced （LTE-A）. For CoMP joint transmission （CoMP-JT） in heterogeneous scenario, if joint transmission （JT） users are firstly scheduled, other non-JT users will not be allocated sufficient resources, i.e., scheduling relevancy exists in the users under different cells in the same coordination cluster. However, the CoMP system throughput will decline remarkably, if the impact of scheduling relevancy is not considered. To address this issue, this paper proposes a novel scheduling scheme for CoMP in heterogeneous scenario. The principles of the proposed scheme include two aspects. Firstly, this scheme gives priority to user fairness, based on an extended proportional fairness （PF） scheduling algorithm. Secondly, the throughput of the coordination cluster should be maintained at a high level. By taking the non-CoMP system as a baseline, the proposed scheme is evaluated by comparing to random PF （RPF） and orthogonal PF （OPF） scheme. System-level simulation results indicate that, the proposed scheme can achieve considerable performance gain in both cell average and cell edge throughput.

关键词： CoMP JT resource scheduling relevancy cell edge throughput

Accumulation of Carbohydrate and Regulation of 14-3-3 Protein on Sucrose Phosphate Synthase(SPS) Activity in Two Tomato Species

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Journal of Integrative Agriculture 2014年第2期13卷 358-364页

作者： WANG Li cui na ZHAO xiao-cui FAN Hai-yan LI Tian-lai Biological Science and Technology College Shenyang Agricultural University Key Laboratory of Protected Horticulture Ministry of Education/College of HorticultureShenyang Agricultural University

To explore the differences of carbohydrate metabolism in two tomato species and discuss the possible regulation of 14-3-3 proteins on the sucrose phosphate synthase （SPS） activity, we determined the contents of soluble sugar and starch through high performance liquid chromatography （HPLC）. The activities of sugar-metabolizing enzymes were assayed in desalted extract, and the relative expression levels of related genes in sugar metabolism were determined though real-time RT-PCR. The results indicated that glucose and fructose were mainly accumulated during the maturation of the fruit because of the high acid invertase （AI） and neutral invertase （NI） in Micro-Tom （Solanum lycopersicum） fruit, while in Solanum chmielewskii fruit, SPS which went along with the change of sucrose content led to the rapid sucrose increase during the fruit ripening. TFT1 and TFT10, belonging to 14-3-3 protein in tomato, were likely to down-regulated SPS activity during young and intumescence period.

关键词： Micro-Tom Solanum chmielewskii carbohydrate accumulation 14-3-3 proteins fruit development

Fabrication,Pore Structures and Mechanical Properties of (TiB_2–Al_2O_3)/NiAl Porous Composites

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Acta Metallurgica Sinica(English Letters) 2017年第12期30卷 1145-1154页

作者： Jie Wu Zhao-Tai Yang Hong-Zhi cui na Wei xiao-Jie Song School of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China

Open-celled porous （TiB2-Al2O3）/NiAl composites were successfully fabricated by using spherical carbamide as space holders via self-propagating high-temperature synthesis （SHS）. Effects of 10Al-3B2O3-3TiO2 contents （0-20 wt%） on the pore structures and the quasi-static compressive behaviors of the resultant materials were investigated. The porous （TiBE-Al2O3）/NiAl composites exhibit composite pore structure consisting of homogeneously distributed and interconnected millimeter pores and micropores. The millimeter pores virtually inherit the shape and size of carbamide particles, while the pore size of micropores increases with increasing the 10Al-3BEO3-3TiO2 content. Depending on the volume fraction of the carbamide, the porosity of the porous materials can be easily controlled in a range of 55%-85%. When the porosity is about 72%, the compressive strengths of porous NiAl and porous （TiBE-Al203）/NiAl composite with 15% 10Al-3B2O3-3TiO2 in green compact are 19 and 32 MPa, and the corresponding strains are 2.9% and 5.7%, respectively. Furthermore, the quasi-static compressive behavior of porous （TiB2-AlEO3）/NiAl composites can be estimated by Gibson-Ashby model.

关键词： Self-propagating high-temperature synthesis (SHS) Pore structure Compressive properties Porous (TiB2-Al2O3)/NiAI

Machine Learning Aided Key-Guessing Attack Paradigm Against Logic Block Encryption

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Journal of Computer Science & Technology 2021年第5期36卷 1102-1117页

作者： Yi Zhong Jian-Hua Feng xiao-Xin cui xiao-Le cui Institute of Microelectronics Peking UniversityBeijing 100871China Key Laboratory of Integrated Microsystems Peking University Shenzhen Graduate SchoolShenzhen 518055China

Hardware security remains as a major concern in the circuit design *** block based encryption has been widely adopted as a simple but effective protection *** this paper,the potential threat arising from the rapidly developing field,i.e.,machine learning,is *** illustrate the challenge,this work presents a standard attack paradigm,in which a three-layer neural network and a naive Bayes classifier are utilized to exemplify the key-guessing attack on logic *** with validation results obtained from both combinational and sequential benchmarks,the presented attack scheme can specifically accelerate the decryption process of partial keys,which may serve as a new perspective to reveal the potential vulnerability for current anti-attack designs.

关键词： hardware security logic encryption machine learning neural network naive Bayes classifier

Tuning the interfacial reaction environment via pH-dependent and induced ions to understand C–N bonds coupling performance in NO3- integrated CO2 reduction to carbon and nitrogen compounds over dual Cu-based N-doped carbon catalyst

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Journal of Energy Chemistry 2025年第1期100卷 273-285页

作者： Tianhang Zhou Chen Shen Zhenghao Wu Xingying Lan Yi xiao College of Carbon Neutrality Future Technology State Key Laboratory of Heavy Oil Processing China University of Petroleum (Beijing) Institute of Materials Science TU Darmstadt Department of Chemistry Xi'an Jiaotong-Liverpool University Department of Mechanical and Mechatronics Engineering and Waterloo Institute of Nanotechnology University of Waterloo Waterloo

Dual atomic catalysts （DAC）,particularly copper （Cu2）-based nitrogen （N） doped graphene,show great potential to effectively convert CO2and nitrate （NO3-） into important industrial chemicals such as ethylene,glycol,acetamide,and urea through an efficient catalytical process that involves C–C and C–N ***,the origin of the coupling activity remained unclear,which substantially hinders the rational design of Cu-based catalysts for the N-integrated CO2reduction reaction （CO2RR）.To address this challenge,this work performed advanced density functional theory calculations incorporating explicit solvation based on a Cu2-based N-doped carbon (Cu2N6C10) catalyst for *** calculations are aimed to gain insight into the reaction mechanisms for the synthesis of ethylene,acetamide,and urea via coupling in the interfacial reaction *** to the sluggishness of CO2,the formation of a solvation electric layer by anions （F-,Cl-,Br-,and I-） and cations (na+,Mg2+,K+,and Ca2+) leads to electron transfer towards the Cu *** process significantly accelerates the reduction of *** results reveal that*CO intermediates play a pivotal role in N-integrated ***,the Cu2-based N-doped carbon catalyst examined in this study has demonstrated the most potential for C–N coupling to *** findings reveal that through the process of a condensation reaction between*CO and NH2OH for urea synthesis,*NO3-is reduced to*NH3,and*CO2to*CCO at dual Cu atom *** dual-site reduction facilitates the synthesis of acetamide through a nucleophilic reaction between NH3and the ketene ***,we found that the I-and Mg2+ions,influenced by pH,were highly effective for acetamide and ammonia synthesis,except when F-and Ca2+were ***,the mechanisms of C–N bond formation were investigated via ab-initio molecular dynamics simulations,and we found that adjusting the micro-environment can change the dominant side reaction,shift

关键词： pH-dependent micro-environments C–N coupling Dual Cu-based nitrogen carbon catalysts Explicit solvation model Ion stabilizer AIMD

Decentralized Optimal Control and Stabilization of Interconnected Systems With Asymmetric Information

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 698-707页

作者： na Wang xiao Liang Hongdan Li xiao Lu the College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266000China the School of Automation and Electrical Engineering Linyi UniversityLinyi 276000China the College of Energy Storage Technology Shandong University of Science and TechnologyQingdao 266000China

The paper addresses the decentralized optimal control and stabilization problems for interconnected systems subject to asymmetric *** with previous work,a closed-loop optimal solution to the control problem and sufficient and necessary conditions for the stabilization problem of the interconnected systems are given for the first *** main challenge lies in three aspects:Firstly,the asymmetric information results in coupling between control and estimation and failure of the separation ***,two extra unknown variables are generated by asymmetric information(different information filtration)when solving forward-backward stochastic difference ***,the existence of additive noise makes the study of mean-square boundedness an *** adopted technique is proving and assuming the linear form of controllers and establishing the equivalence between the two systems with and without additive noise.A dual-motor parallel drive system is presented to demonstrate the validity of the proposed algorithm.

关键词： Asymmetric information decentralized control forwardbackward stochastic difference equations interconnected system stalibization

Cross-linked lipoic acid nanoparticles with indole-3-methanol loading for the PTEN-me diate d TNBC treatment

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Journal of Materials Science & Technology 2024年第14期181卷 198-208页

作者： xiao xiao Rong cui Chunyan Liao Shiyong Zhang College of Biomedical Engineering and national Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064China

We here report a non-gene therapy anti-tumor nanoparticles(I3C@cLANPs)based PTEN by loading indole-3-methanol(I3C)into the cross-linked lipoic acid nanoparticles(cLANPs)for triple-negative breast cancer(TNBC)treatment.I3C is a PTEN-specific natural activator while the poor PTEN-activation effi-ciency impedes its ability to achieve the PTEN-mediated tumor *** to the structural homology of lipoic acid(LA),the cLANPs hold not only LA-like anticancer activity but also PTEN-activation proper-ties,which would synergistically potentiate the PTEN-activation *** in vitro and in vivo data showed that PTEN expression in the I3C@cLANPs group was 2.1 and 2.8 times higher than that of I3C,*** antitumor evaluation based on the 4T1 tumor-bearing mice showed a tumor inhibitory rate(TIR)of 78.4%at the I3C usage of 20 mg kg^(–1),54.5%higher than that of I3C alone and 19.7%higher than that of first-line chemotherapy drug Doxorubicin hydrochloride(DOX).Thus,the I3C@cLANPs could address the low activation efficiency in the PTEN-mediated tumor strategy and avoid the risks of gene therapy,holding a good prospect for TNBC and related cancer treatment.

关键词： Triple-negative breast cancer Indole-3-methanol Lipoic acid Synergistic therapy

Observational Constraints on Quark Matter in Neutron Stars

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Chinese Journal of Astronomy and Astrophysics 2007年第5期7卷 675-684页

作者： na-na Pan xiao-Ping Zheng Institute of Astrophysics Huazhong Normal University Wuhan 430079

We study the observational constraints of mass and redshift on the properties of the equation of state （EOS） for quark matter in compact stars based on the quasi-particle description. We discuss two scenarios; strange stars and hybrid stars. We construct the equations of state utilizing an extended MIT bag model taking the medium effect into account for quark matter and the relativistic mean field theory for hadron matter. We show that quark matter may exist in strange stars and in the interior of neutron stars. The bag constant is a key parameter that affects strongly the mass of strange stars. The medium effect can lead to the stiffer hybrid-star EOS approaching the pure hadronic EOS, due to the reduction of quark matter, and hence the existence of heavy hybrid stars. We find that a middle range coupling constant may be the best choice for the hybrid stars being compatible with the observational constraints.

关键词： dense matter -- gravitation -- stars neutron -- stars rotation -- stars oscillations