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CsABF3-activated CsSUT1 pathway is implicated in pre-harvest water deficit inducing sucrose accumulation in citrus fruit

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Horticultural Plant Journal 2024年第1期10卷 103-114页

作者： Xiaochuan ma Yuanyuan chang Feifei Li Junfeng Yang Li Ye Tie Zhou Yan Jin Ling sheng Xiaopeng Lu College of Horticulture Hunan Agricultural UniversityChangshaHunan 410128China National Center for Citrus Improvement ChangshaHunan 410128China Institute of Horticulture Hunan Academy of Agricultural ScienceChangshaHunan 410125China

Pre-harvest water deficit(PHWD)plays an important role in sugar accumulation of citrus ***,the mechanism is not known ***,it was confirmed that PHWD promoted sucrose accumulation of citrus fruit,but had limited effect on fructose,glucose and total acid.A sucrose transporter,Cs SUT1,which localizes to the plasma membrane,was demonstrated to function in sucrose transport induced by *** to wild-type,Cs SUT1 overexpression in citrus calli stimulated sucrose,fructose and glucose accumulation,while its silencing in juice sacs reduced sucrose *** sugar accumulation in transgenic lines enhanced plant drought tolerance,and resulted in decreased electrolyte leakage,malondialdehyde and hydrogen peroxide contents,as well as increased superoxide dismutase activity and proline *** abscisic acid(ABA)-responsive transcription factor,Cs ABF3,was found with a same expression pattern with Cs SUT1 under *** one-hybrid,electrophoretic mobility shift assay and dual-luciferase assays all revealed that Cs ABF3 directly bound with the Cs SUT1 promoter by ABA responsive *** Cs ABF3 was overexpressed in citrus calli,the sucrose,fructose and glucose concentration increased ***,transgenic studies demonstrated that Cs ABF3 could affect sucrose accumulation by regulating Cs ***,this study revealed a regulation of Cs ABF3 promoting Cs SUT1 expression and sucrose accumulation in response to *** results provide a detail insight into the quality formation of citrus fruit.

关键词： Citrus Water deficit Pre-harvest Sucrose CsABF3 CsSUT1

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DFT Studies on Hydrogen Overfall Mechanism for Catalyzed Hydroisomerization of Pentane

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Chinese Journal of Structural Chemistry 2007年第2期26卷 239-247页

作者： AI Chun-Zhi SUN Ren-An WANG chang-sheng College of Chemistry and Chemical Engineering Liaoning Normal University Dalian 116029 China Dalian Institute of Chemical Physics The Chinese Academy of Sciences Dalian 116021 China

The mechanism and related reaction paths in the hydroisomerization of n-pentane were studied by DFT calculations at the B3LYP/6-311＋＋G^＊＊ level. Two possible transition states were theoretically predicted and verified by the vibration frequency analysis as well as the calculations of intrinsic reaction coordinates （IRC）. Furthermore, the related reaction barriers were evaluated by single point energy at the MP2/6-311＋＋G^＊＊ level with zero point vibration correction of DFT method. Thus, it is concluded that the isomerization might go through two pathways.

关键词： catalyzed isomerization of n-pentane hydrogen overfall mechanism i-pentane DFT

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Label-free fluorescent strategy for sensitive detection of tetracycline based on triple-helix molecular switch and G-quadruplex

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Chinese Chemical Letters 2017年第7期28卷 1380-1384页

作者： Tian-Xiao Chen Feng Ning Hai-sheng Liu Ke-Feng Wu Wei Li chang-Bei ma School of Chemistry and Biological Engineering Changsha University of Science and Technology State Key Laboratory of Medical Genetics & School of Life Sciences Central South University

In this assay, a label-free fluorescent sensing platform based on triple-helix molecular switch（THMS） and G-quadruplex was developed for the detection of tetracycline. We demonstrated this approach by using THMS, which consists of a central section with a shortened 8-mer aptamer sequence with high affinity to tetracycline and flanked by two arm segments. G-rich oligonucleotide can specifically bind to thioflavin T（Th T） as a signal transduction probe（STP）. In the absence of tetracycline, THMS remains stable, the fluorescence of background is low. By the addition of target tetracycline, the aptamer-target binding results in the formation of a structured aptamer-target complex, which disassembles the THMS and releases the STP. The free STP self-assembles into G-quadruplex and specifically binds to Th T which generates a obvious fluorescence enhancement. Using the triple-helix molecular switch, the developed aptamer-based fluorescent sensing platform showed a linear relationship with the concentration of tetracycline ranging from 0.2 to 20.0 nmol/L. The detection limit of tetracycline was determined to be970.0 pmol/L. The assay avoids complicated modifications or chemical labeling, making it simple and cost-effective. So, it is expected that this aptamer-based fluorescent assay could be extensively applied in the field of food safety inspection.

关键词： Tetracycline Aptamer Label-free Triple-helix molecular switch G-quadruplex Thioflavin T

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Dynamic recrystallization behavior and microstructure evolution of high-performance Cu-3.28Ni-0.6Si-0.22Zn-O.11Cr-0.04P during hot compression

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Rare Metals 2021年第1期40卷 156-167页

作者： chang-sheng Wang Hua-Dong Fu Jian-Xin Xie Beijing Advanced Innovation Center for materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic materials and Processing for Modern Transportation Institute for Advanced Materials and TechnologyBeijing 100083China

By means of isothermal compression at temperatures in the range of 650-900℃and strain rates in the range of 0.001-1 s^(-1),the dynamic recrystallization behavior and microstructural evolution of a Cu-3.28 Ni-0.6 Si-0.22 Zn-0.11 Cr-0.04 P(wt%)alloy designed by a machine learning method were investigated.A semiempirical constitutive equation,processing maps and an average activation energy were *** microstructure under different conditions and the effect of strain rate on the texture of the alloy at 800-900℃were *** results show that the suitable temperature is800-900℃;when the strain is less than 0.4,the appropriate strain rate is 0.01-0.5 s^(-1);and when the strain is greater than 0.4,the appropriate strain rate is below0.05 s^(-1).After deformation at 800℃,the main texture changed from{112}of copper to a uniform distribution with the increase in strain rate,but the sample did not have obvious texture after deformation at 850 and900℃.The above results can provide a reference for the selection of process parameters.

关键词： High-performance copper alloy Hot compression Dynamic recrystallization Processing map Texture evolution

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Synchro-control of Twin-rudder with Cloud Model

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International Journal of Automation and computing 2012年第1期9卷 98-104页

作者： sheng Liu Xu-Cheng chang College of Automation Harbin Engineering UniversityHarbin 150001PRC

In ships having two rudders, an angle error exists if there is a difference in structural and electrical parameters in two steering gear systems. Such an error also results in reduced efficiency of ship maneuverability during navigation. For the sake of reducing the angle error, a synchro-ballistic control approach based on cloud model is proposed in this paper. First, the mechanism model of steering gear system is introduced. Second, the structure of synchro-control system of twin-rudder is proposed based on the master-slave control strategy. Third, synchro-ballistic controller based on cloud model is designed to solve the nonlinearity and uncertainty of system. Finally, the designed controller is tested via simulation under two different situations. The simulated results demonstrate that this method is simple and has stronger robustness against the variation of states and parameters of plants. Hence, the validity and reliability of the method is proved for synchro-control of two rudders, which is a significant engineering application.

关键词： Ship steering steering gear twin-rudder synchro-ballistic cloud model.

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Interference migration using concurrent transmission for energy-efficient Het Nets

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Science China(Information Sciences) 2016年第2期59卷 153-162页

作者： Xiao ma Min sheng Jiandong LI Jingwei XIN School of Physics and Information Technology Shaanxi Normal University State Key Laboratory of Integrated Service Networks Xidian University

This paper explores the non-uniform distribution property of interference from the perspective of green communications. An interference migration strategy with concurrent transmission is proposed to transfer the interference among different interference regions. In particular, an interference intensity index is used to depict the non-uniform interference distribution. Then we derive the threshold for executing interference migration and the optimal transmission splitting probabilities for energy efficiency(EE) maximization. The results demonstrate that our strategy significantly improves the EE.

关键词： interference migration energy efficiency concurrent transmission heterogeneous networks mobile hotspot

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Phase-only pattern synthesis based on gradient-descent optimization

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Journal of Systems Engineering and Electronics 2016年第2期27卷 297-307页

作者： Chengjun Lu Weixing sheng Yubing Han Xiaofeng ma School of Electronic and Optical Engineering Nanjing University of Science and Technology

By applying phase-only technique in array antenna pattern synthesis, antenna arrays can form desired patterns with the use of phase shifters only. A novel phase-only pattern synthesis algorithm is proposed for the passive phased array seeker. This algorithm synthesizes the main beam of the antenna pattern through least-squares approximation, thus minimizing the errors between the actual and the desired main beams. The synthesis problem can be solved by applying gradient-descent optimization. The item for suppressing side lobes is added to the above synthesis problem. To obtain a side lobe level as low as possible, the algorithm assigns different weights to different directions in the side lobe region. The algorithm is run repeatedly and the weights are adjusted adaptively according to the normalized power in the side lobe directions. Detailed examples are presented to demonstrate the accuracy and effectiveness of the proposed approach.

关键词： pattern synthesis phase-only gradient-descent adaptively

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Concurrent transmission for energy efficiency of user equipment in 5G wireless communication networks

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Science China(Information Sciences) 2016年第2期59卷 82-96页

作者： Xiao ma Min sheng Jiandong LI Qiuju YANG School of Physics and Information Technology Shaanxi Normal University State Key Laboratory of Integrated Service Networks Xidian University

In this paper, we investigate concurrent transmission among multiple radio access technologies(RATs) for energy efficiency(EE) of multi-mode user equipment(MUE) in 5G wireless communication *** both the static circuit power consumption of the MUE and channel state information of different RATs, we propose an EE maximization concurrent transmission(EXACT) strategy by fully utilizing the multiRAT combining gain of concurrent transmission. In particular, we formulate such EE maximization concurrent transmission problem as a mixed binary integer programming(MIP), and under some given static circuit power conditions, the optimal RATs selection and transmission rates for establishing concurrent transmission among multiple RATs are derived. Furthermore, in order to deal with the challenging MIP, an approximate expression is derived to simplify the integer constraints, thus the original MIP is transformed into a nonlinear continuous optimization problem. Consequently, a low complexity heuristic algorithm for general static circuit power conditions, which can achieve the near-optimal solution, is presented. Simulation results confirm the effectiveness of the EXACT strategy and show that the EE performance of the MUE can be significantly improved by reasonable and effective utilization of multiple RATs to execute concurrent transmission.

关键词： energy efficiency green communication concurrent transmission 5G wireless communication networks data splitting

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On cross-correlation indicators of an S-box

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Frontiers of Computer Science 2011年第4期5卷 448-453页

作者： sheng GAO Wenping ma Zepeng ZHUO Fenghe WANG Key Laboratory of Computer Network and Information Security Ministry of Education Xidian University Xi＇an 710071 China State Key Laboratory of Integrated Service Networks Xidian University Xi＇an 710071 China

Substitution boxes （S-boxes） are often used as the most important nonlinear components in many symmetric encryption algorithms. The cryptographic properties of an S-box directly affect the security of the whole cipher system. Recently, generalized global avalanche characteristics （GGAC） were introduced to measure the correlation between two arbitrary Boolean functions. In this paper, to better evaluate the security of an S-box, we present two cross-correlation indicators for it. In addition, by studying the related properties of the cross-correlation between two balanced Boolean func- tions, we propose the lower bounds on the sum-of-squares indicator related to GGAC for two balanced functions and also for an S-box.

关键词： cryptography Boolean functions substitu-tion boxes balancedness generalized global avalanchecharacteristics cross-correlation

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Air Plasma-Activated Crosslinking of Low-Density Polyethylene During Melt Mixing

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Transactions of Tianjin University 2020年第1期26卷 33-39页

作者： Yangfeng Cui Zhe ma Guiqiu ma Jing sheng School of materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University

In this work,air plasma surface treatment followed by oxidation in an atmospheric environment was used to generate activated low-density polyethylene(LDPE)with oxygen-containing functional groups and peroxide *** resulting samples were then studied by using attenuated total internal reflectance-Fourier-transform infrared spectroscopy,X-ray photoelectron spectroscopy,and the 2,2-diphenyl-1-picrylhydrazyl *** radicals are generally considered active substances which can initiate the crosslinking *** mixing of the surface-treated LDPE allowed activated polymer chains with peroxide radicals to initiate the crosslinking reaction,and the maximum gel fraction obtained was 4.1%.The rheological behaviors,including viscosity,storage and loss moduli,loss tangent,and Cole-Cole plots,of the slightly crosslinked LDPE were studied,and the results of tensile experiments revealed that the formation of slightly crosslinked structures can improve yield and fracture stresses without sacrificing the breakage strain.

关键词： Air plasma Slight crosslinking Rheological behaviors Mechanical properties

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