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Journal of Forestry Research 2021年第2期32卷 779-787页

作者： Jian Diao Xin Hao Wei ma ling ma College of Forestry Northeast Forestry UniversityHarbin 150040People’s Republic of China Heilongjiang University of Chinese Medicine Harbin 150000People’s Republic of China

Genes homologous to members of the MRP gene family in Caenorhabditis elegans are important in drug *** further explore the molecular mechanism of drug resistance in pine wood nematode(Bursaphelenchus xylophilus),we used bioinformatics approaches to analyze genomic data for *** and identified Bx-MRP *** predicted the structure and function of the genes and encoded *** bioinformatics programs to predict and analyze various properties of the predicted proteins,including hydrophobicity,transmembrane regions,phosphorylation sites,and topologically isomeric structures,of these Bx-MRP genes,we determined that they function in transmembrane *** the results of RT-qPCR,the Bx-MRP family members confer significant differential resistance to different drug *** treatment with different concentrations of emamectin benzoate,avermectin and matrine,the expression of each gene increased with increasing drug concentrations,indicating that the family members play a positive role in the regulation of multidrug resistance.

关键词： Bursaphelenchus xylophilus Bx-MRP gene family Gene and protein structure Bioinformatics Multidrug stress

Pathogenicity of Serratia marcescens to hazelnut weevil(Curculio dieckmanni)

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Journal of Forestry Research 2021年第1期32卷 409-417页

作者： Ping Zhang Qingquan Zhao Xiaoqian ma ling ma College of Forestry Northeast Forestry University26 Hexing RoadHarbin 150040People’s Republic of China Forest Protection Research Institute Heilongjiang Academy of ForestryHaping RoadHarbin 150081People’s Republic of China

The hazelnut weevil(Curculio dieckmanni Faust.)is a major pest of Asian hazel(Corylus heterophylla Fisch.)in *** hazelnut weevil larvae were examined and the associated pathogenic bacterium was identifi ed as Serratia marcescens *** signifi cantly shortened the lifespan of hazelnut *** weight was reduced as a function of *** concentration and exposure *** structure of infected midgut cells was altered,with necrosis of the wall tissues and many cells becoming dislodged,creating *** *** strain inhibited digestive enzyme activity and protective enzymes in the midgut of adult hazelnut *** on *** strain increased with treatment *** directly destroyed the midgut cells and interfered with digestive and protective *** decreased the food intake and increased mortality of hazelnut *** appears to be an eff ective bacterium for the control of hazelnut weevil but requires further study,including biological formulation development and fi eld application.

关键词： Biocontrol Curculio dieckmanni Corylus heterophylla Pathogenic mechanism Serratia marcescens

Symmetry and monotonicity of positive solutions to Schr?dinger systems with fractional p-Laplacians

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Applied mathematics(A Journal of Chinese Universities) 2022年第1期37卷 52-72页

作者： ma ling-wei ZHANG Zhen-qiu School of mathematical Sciences Tianjin Normal UniversityTianjin 300387China School of mathematical Sciences and LPMC Nankai UniversityTianjin 300071China

In this paper,we first establish narrow region principle and decay at infinity theorems to extend the direct method of moving planes for general fractional p-Laplacian *** virtue of this method,we investigate the qualitative properties of positive solutions for the following Schrodinger system with fractional p-Laplacian{(-△)^(s)_(p)u+au^(p-1)=f(u,v),(-△)^(t)_(p)v+bv(p-1)=g(u,v),where 0main and the nonexistence on the half space for positive solutions to the above system under some suitable conditions on f and g,respectively.

关键词： fractional p-Laplacian Schr?dinger systems direct method of moving planes radial symmetry monotonicity nonexistence

Blind identification of space–time block codes based on deep learning

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Chinese Journal of Aeronautics 2022年第1期35卷 426-435页

作者： Limin ZHANG Yuyuan ZHANG Wenjun YAN ling ma Institute of Information Fusion Naval Aeronautical UniversityYantai 264001China Coastal Defense College Naval Aeronautical UniversityYantai 264001China

Deep Learning(DL)has important applications to both commercial and military communications,such as software-defined radio,cognitive radio and spectrum *** DL has been intensively studied for modulation recognition,there are very few investigations for blind identification of Space-Time Block Codes(STBCs).This paper proposes a Residual Network(RN)-based model for identifying 6 kinds of STBC signals with a single receiving antenna,including the same length of coding *** our work,we use the frequency-domain correlation function of a single time delay as the training data of DL ***,we explore the suitable RN structure for blind identification of ***,we compare the RN model with convolutional neural network and traditional method,and test the performance of RN *** results show that our RN-based model provides good performance with low sensitivity to decay of the dataset,such as sample length and data *** the same time,better identification accuracy can be achieved under the condition of different modulation types and channel fading parameters at low Signal to Noise Ratio(SNR).

关键词： Blind identification Deep learning Multiple-input multiple-output Residul network Space-time block code

A Novel Photoproduct of Thymine in Phosphate-buffered Saline under Far UV Irradiation

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Chinese Chemical Letters 2003年第12期14卷 1233-1235页

作者： Feng LIN Qing ling ma Department of Chemistry Xi-xi CampusZhejiang UniversityHangzhou 310028

The photolysis of thymine in phosphate-buffered saline (PBS, pH 8.0) under the irradiation of medium pressure mercury lamp (MPML) produces a novel compound C5H7N2O6P. The composition and structure of the compound hav... 详细信息

关键词： UV photolysis thymine phosphate-buffered saline (PBS).

Overexpression of the PdpapERF109 gene enhances resistance of Populus davidiana×*** *** to Fusarium oxysporum infection

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Journal of Forestry Research 2022年第6期33卷 1925-1937页

作者： Jian Diao Mingrui Li Ping Zhang Cheng Zong Wei ma ling ma College of Forestry Northeast Forestry UniversityHarbinPeople’s Republic of China College of Wildlife and Protected Area Northeast Forestry UniversityHarbinPeople’s Republic of China College of Medicine Heilongjiang University of Chinese MedicineHarbinPeople’s Republic of China

The key transcription factor gene PdP apE RF109 was cloned from Populus davidiana×*** ***(Pdpap),and after overexpression of P dP ap ERF109 in transformants,the gene functions in the resistance response to Fusarium oxysporum *** with the wild Pdpap,after inoculation with ***,the physiological and biochemical characteristics,including relative fresh weight,peroxidase activity,and the percentage of electrolyte leakage showed that,after overexpression of the PdPapERF109 gene,the transformants grew well and displayed significant resistance to *** *** comparing the reactive oxygen species scavenging capacity of Pdpap plants after pathogen infection,the P dPapERF109-overexpressing plants had significantly better reactive oxygen species scavenging ability than the wild *** analysis of plant morphology and various physiological and biochemical parameters showed that the overexpression of the P dpapERF109 gene significantly improved the resistance of Pdpap plants to *** root ***,increasing the expression of the homologous ERF109 gene can be an effective strategy to increase disease resistance in hybrid poplars.

关键词： ERF Fusarium oxysporumtolerance Gene over-expression Genetic transformation Transcription factor

Molecular characterization and functional analysis of USP-1 by RNA interference in the Asian gypsy moth Lymantria dispar

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Journal of Forestry Research 2020年第5期31卷 1923-1931页

作者： Rongrong Wen Qingquan Zhao Buyong Wang Yan ma ling ma School of Forestry Northeast Forestry UniversityHarbin 150040People’s Republic of China College of Agricultural and Biological Engineering Heze UniversityHeze 274015People’s Republic of China College of management Harbin University of CommerceHarbin 150028People’s Republic of China

Ecdysteroids play an important role in regulating diverse physiological processes in arthropods,such as molting,metamorphosis,reproduction and *** mediate the response by binding to a heterodimeric complex of two nuclear receptors:the ecdysone receptor and the ultraspiracle(USP).To investigate the role of USP in development of the Asian gypsy moth(Lymantria dispar),a USP cDNA was obtained from the transcriptome of *** and verified by ***-depth profiling of transcript levels of *** USP-1(LdUSP-1)at different developmental stages and over time in thirdinstar larvae and different tissues isolated during the thirdinstar stage of *** was then carried *** levels of LdUSP-1 were relatively high before 72 h in the third-instar larvae after ecdysis and in the adult *** function of LdUSP-1 in molting was analyzed by knockdown of LdUSP-1 in third instar larvae using RNA *** of LdUSP-1 significantly downregulated the transcript level of E75,an ecdysone-inducible gene,and of Sad,a Halloween *** addition,the duration of the third-instar stage was slightly shortened and larval mortality increased after the LdUSP-1 knockdown.

关键词： Lymantria dispar Ultraspiracle gene Ecdysone RNA interference Development

A New and Efficient Synthesis of 2H-3, 1-Benzoxazine Compounds

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Chinese Chemical Letters 2005年第11期16卷 1424-1426页

作者： Jia Rong LI Shu ling ma School of Chemical Engineering and Environment Beijing Institute of Technology Beijing 100081

2H-3, 1-Benzoxazine derivatives were synthesized by cyclocondensation of 5-nitro-2- cyanoaniline with relative ketone or aldehyde with ZnCl2 as a catalyst. This is a new efficient synthetic route of 2H-3, 1-benzoxazin... 详细信息

关键词： 2H-3 1-Benzoxazine cyclocondensation synthesis

Synthesis of 5-Substituted-3-[(2’R,4’R)-4’-Hydroxy-2’-hydroxymethyltetrahydrofuran-4’-yl]-1,2,4-oxadiazoles and Their Epimers

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Chemical Research in Chinese Universities 2001年第4期17卷 407-414页

作者： WU Wei-dong ma ling-tai ZHANG Li-he National Laboratory of Natural and Biomimetic Drugs School ofPharmaceutical SciencesPeking UniversityBeijing 100083P.R.China

The syntheses of 5-substituted-3-[( 2’ R, 4’ R)-4 ’ -hydroxy-2 ’ -hydroxymethyltetra-hydrofuran-4’ -yl]D-1 ,2, 4-oxadiazoles and their epimers were accomplished with the aid of th construction of 1,2, 4-oxadiazoles by condensation of O-acylated cyanohydrins with hydroxylamine via intramolecular transacylation and subsequent cyclization.

关键词： Nucleoside analogue 1,2,4-Oxadiazole Transacylation

Higher Order Fractional Differentiability for the Stationary Stokes System

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Acta mathematica Sinica,English Series 2023年第1期39卷 13-29页

作者： ling Wei ma Zhen Qiu ZHANG Qi XIONG School of mathematical Sciences Tianjin Normal UniversityTianjin 300387P.R.China School of mathematical Sciences and LPMC Nankai UniversityTianjin 300071P.R.China School of mathematical Sciences Nankai UniversityTianjin 300071P.R.China

This paper focuses on the higher order fractional differentiability of weak solution pairs to the following nonlinear stationary Stokes system{div A(x-Du)-■π=divF,inΩdivu=0,inΩ.In terms of the difference quotient method,our first result reveals that if F∈B_(p,***)^(β)(Ω,R^(n))for p=2 and 1≤q≤2n/n-2β,then such extra Besov regularity can transfer to the symmetric gradient Du and its pressureπwith no losses under a suitable fractional differentiability assumption on x■A(x,ξ).Furthermore,when the vector field A(x,Du)is simplified to the full gradient■u,we improve the aforementioned Besov regularity for all integrability exponents p and q by establishing a new Campanato-type decay estimates for(■u,π).

关键词： Higher order fractional differentiability Stokes system Besov spaces