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Community structures and population dynamics of “Candidatus Accumulibacter” in activated sludges of wastewater treatment plants using ppk1 as phylogenetic marker

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Journal of Environmental Sciences 2018年第5期30卷 237-248页

作者： Wei zeng Limin Zhang Pengchao Fan Jingjing guo Yongzhen Peng National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Department of Environmental EngineeringBeijing University of Technology

Candidatus Accumulibacter has been identified as dominant polyphosphate-accumulating organisms（PAOs） in enhanced biological phosphorus（P） removal（EBPR） from *** study revealed the relevance of community structure, abundance and seasonal population dynamics of Candidatus Accumulibacter to process operation of wastewater treatment plants（WWTPs） in China using ppk1 gene as phylogenetic marker. All sludge samples had properties of denitrifying P removal using nitrate as an electron *** abundance in the anaerobic-anoxic-oxic（A^2O） process was the highest（26%of total bacteria）, and higher in winter than in summer with a better EBPR ***-II was the dominant Accumulibacter in all processes, and type-I accounted for a small proportion of total Accumulibacter. The abundance of Clade-IIC as the most dominant clade reached 2.59 × 10~9 cells/g MLSS and accounted for 87.3% of total Accumulibacter. Clade IIC mainly contributed to denitrifying P removal. Clades IIA, IIC and IID were found in all processes, while clade-IIF was only found in oxidation ditch process through phylogenetic analysis. High proportion of clade IID to total Accumulibacter led to poor performance of aerobic P-uptake in inverted A^2O process. Therefore, Accumulibacter clades in WWTPs were diverse, and EBPR performance was closely related to the clade-level community structures and abundances of Accumulibacter.

关键词： Candidatus Accumulibacter Polyphosphate kinase 1 gene (ppk1) Activated sludge Enhanced biological phosphorusremoval (EBPR) Wastewater treatmentplants (W Ps)

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Factors Influencing Glucoraphanin and Sulforaphane Formation in Brassica Plants:A Review

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Journal of Integrative Agriculture 2012年第11期11卷 1804-1816页

作者： GU zhen-xin guo Qiang-hui GU Ying-juan College of Food Science and Technology Nanjing Agricultural University Nanjing 210095 P.R.China

Sulforaphane is a type of sulfur-containing isothiocyanates hydrolyzed from glucosinolates by myrosinase found in Brassica plants. Sulforaphane is a naturally occurring inducer of phase II enzymes in human and animal bodies to detoxify cancer-causing chemicals. Glucoraphanin is the precursor of sulforaphane and its content is greatly influenced by plant species and genotype, plant organs, pre-harvest factors, and post-harvest processing, thus sulforaphane formation is also directly influenced. Here, we review the formation mechanism of sulforaphane and the factors influencing sulforaphane formation. In the end, the future directions are also discussed.

关键词： Brassica plant glucosinolate sulforaphane glucoraphanin influencing factor

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Numerical analysis of pipeline in J-lay problem

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第11期11卷 908-920页

作者： Li-zhong WANG Feng YUAN zhen guo Ling-ling LI College of Civil Engineering andArchitecture Zhejiang University Hangzhou 310058 China

The pipe configuration and internal loads along the pipeline during the pipeline laying process have long been the focus of engineers. Most researchers simplify the seabed to be rigid and the water to be calm, ignoring the pipe embedment into the seabed and the influence of ocean currents. In this paper, a novel numerical approach is proposed for the laying of pipelines in the so-called J-lay method, taking into account the importance of both pipe embedment and ocean currents. The pipeline is divided into two parts, one part suspended in water, and the other laid on the seabed. The continuity of the two parts at the touch down point (TDP) is guaranteed to make a whole. The feasibility of the model is proved by the comparison between the present model and an analytical model, which shows good agreement in both pipeline configuration and bending moment distribution. Finally, parametric study was performed to consider the influence of current velocity, water depth, top inclination angle, and seabed stiffness, and conclusions are drawn.

关键词： Pipeline J-lay method Numerical model Seabed stiffness Current velocity

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Temperature-responsive Behavior of Polymer Fluorescent System via Electrostatic Interaction Mediated Aggregation/Deaggregation

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Chinese Journal of Polymer Science 2016年第7期34卷 830-837页

作者： si-hua guo fang-yuan zheng fang zeng 吴水珠 College of Materials Science and Engineering State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China

A simple and effective polymer fluorescent thermosensitive system was successfully developed based on the synergistic effect of excimer/monomer interconversion of pyrene derivatives and electrostatic interaction between polyelectrolyte and charged fluorophore. As for the system, the excimer-monomer conversion, thermosensitive behavior and thermo-responsive reversibility were investigated experimentally. Temperature variation and temperature-distribution induced fluorescence changes can be observed directly by naked eyes. Thus, this polymer system holds promise for serving as a fluorescent thermometer.

关键词： Polymer fluorescent thermometer Temperature-responsive Electrostatic interaction Aggregation Deaggregation

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The role of wildlife (wild birds)in the global transmission of antimicrobial resistance genes

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Zoological Research 2017年第2期38卷 55-80页

作者： Jing Wang zhen-Bao Ma zhen-Ling zeng Xue-Wen Yang Ying Huang Jian-Hua Liu College of Veterinary Medicine South China Agricultural University Guangzhou 510642 China

Antimicrobial resistance is an urgent global health challenge in human and veterinary medicine. Wild animals are not directly exposed to clinically relevant antibiotics; however, antibacterial resistance in wild animals has been increasingly reported worldwide in parallel to the situation in human and veterinary medicine. This underlies the complexity of bacterial resistance in wild animals and the possible interspecies transmission between humans, domestic animals, the environment, and wildlife. This review summarizes the current data on expanded- spectrum 13-1actamase （ESBL）, AmpC IB-lactamase, carbapenemase, and colistin resistance genes in Enterobacteriaceae isolates of wildlife origin. The aim of this review is to better understand the important role of wild animals as reservoirs and vectors in the global dissemination of crucial clinical antibacterial resistance. In this regard, continued surveillance is urgently needed worldwide.

关键词： AmpC ESBLs IMP, mcr-1 NDM Wild birds

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HSAEP:a new platform to evaluate hybrid simulation algorithms

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Frontiers of Computer Science 2021年第5期15卷 211-213页

作者： Wei guo Xiaoxu DUAN Chen zeng Ping SHAO School of Civil Engineering Central South UniversityChangsha 410075China

1 Introduction Hybrid simulation method in civil engineering is a test method that combines numerical simulation and physical testing[1].The basic procedure of hybrid simulation is shown in *** hybrid simulation,the performance of the algorithm has a great influence on the test results[2].However,there is no standard test platform or standard model to test the performance of the hybrid simulation *** situations limit the development of hybrid simulation algorithms and may lead to unreliable hybrid simulation results.

关键词： algorithm. simulation combine

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Scalable protocol for cross-domain group password-based authenticated key exchange

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Frontiers of Computer Science 2015年第1期9卷 157-169页

作者： Cong guo Zijian ZHANG Liehuang ZHU Yu-an TAN zhen YANG Beijing Engineering Research Center of Massive Language Information Processing and Cloud Computing Application School of Computer Science and Technology Beijing Institute of Technology Beijing 100081 China

Cross-domain password-based authenticated key exchange （PAKE） protocols have been studied for many years. However, these protocols are mainly focusing on multi-participant within a single domain in an open network environment. This paper proposes a novel approach for designing a cross-domain group PAKE protocol, that primarily handles with the setting of multi-participant in the multi- domain. Moreover, our protocol is proved secure against active adversary in the Real-or-Random （ROR） model. In our protocol, no interaction occurs between any two domain authentication servers. They are regarded as ephemeral certificate authorities （CAs） to certify key materials that participants might subsequently use to exchange and agree on group session key. We further justify the computational complexity and measure the average computation time of our protocol. To the best of our knowledge, this is the first work to analyze and discuss a provably secure multi-participant cross-domain group PAKE protocol.

关键词： cross-domain password-based authenticated key exchange (PAKE) group key exchange Real-Or-Random (ROR) model provable secure

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Global Stability of a Mumps Transmission Model with Quarantine Measure

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Acta Mathematicae Applicatae Sinica 2021年第4期37卷 665-672页

作者： Yu-zhen BAI Xiao-jing WANG Song-bai guo School of Science Beijing University of Civil Engineering and ArchitectureBeijing102616China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing100190China

In this paper,a model of mumps transmission with quarantine measure is proposed and then the control reproduction number Rc of the model is *** model admits a unique endemic equilibrium P*if and only if Rc>1,while the disease-free equilibrium P0 always *** using the technique of constructing Lyapunov functions and the generalized Lyapunov-LaSalle theorem,we first show that the equilibrium P0 is globally asymptotically stable(GAS)if Rc≤1;second,we prove that the equilibrium P*is GAS if Rc>*** results reveal that mumps can be eliminated from the community for Rc≤1 and it will be persistent for Rc>1,and quarantine measure can also effectively control the mumps transmission.

关键词： mumps transmission model control reproduction number quarantine measure global stability

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Structural and electrical properties of high Curie temperature Aurivillius phase composite ceramics with largely enhanced piezoelectricity

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Science China(Technological Sciences) 2016年第7期59卷 1048-1053页

作者： WANG YunLi CAI Kai MA JingTao zeng Fei guo Dong Institute of Acoustics Chinese Academy of Sciences Beijing 100190 China Beijing Center for Physical and Chemical Analysis Beijing 100089 China School of Materials Science & Engineering Tsinghua University Beijing 100084 China School of Materials Science & Engineering Beihang University Beijing 100191 China

High performance piezoelectric ceramics with high Curie temperatures(TC) are the bottle necks of relevant high temperature devices. In this study, the electrical performance and microstructure of Li and Mn codoped Aurivillius-type composite ceramics with a composition Ca_(0.99-x_Bi_(6.99+x)(Li Mn)_(0.01) Nb Ti_5O_(24)(x = 0–0.8) were systematically investigated. The results indicated that uniform intergrowth structure with a lattice similar to that of the end member CBT could be formed at a low x value(x < 0.4). Phase separation occurred when more A-site Ca^(2+) ions were replaced by Bi^(3+) ions. Nevertheless, all composite samples showed d_(33) values about 2 to 3 times of that of the constituent phase Ca Bi_4Ti_4O_(15) and Bi_3 Ti NbO_9 with still a high depolarization temperature. The performance of the samples was found to be related to the density and larger lattice distortion along the polarization a axis. The results also demonstrated that formation of the compound system was an effective way in improving the performance of Aurivillius-type high TC piezoelectric ceramics.

关键词： piezoelectric ceramics Curie temperature ferroelectricity dielectric properties

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Dynamic Alignment of D2 Enhanced by Two Few-cycle Pulses

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Chinese Journal of Chemical Physics 2008年第5期21卷 421-426页

作者： zeng-qiang Yang Zhi-rong guo Bao-xiang Yin Mao-zhu Sun Key Laboratory of Ecophysics and Department of Physics Normal College Shihezi University Shihezi832003 China

Dynamic alignment of D2 induced by two few-cycle pulses was investigated by solving the time-dependent Schr6dinger equation numerically based on a rigid rotor model. The results show that alignment of D2 can be enhanced by two few-cycle pulses compared with the level achievable by a single few-cycle pulse as long as the time delay between two pulses is chosen properly, and the pulse duration of two lasers plays an important role in the aligning process of D2 molecules.

关键词： Dynamic alignment Few-cycle pulses Pulse duration

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