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Chromosomal location of yellow rust resistance gene(s) in Triticum aestivum-Lophopyrum elongatum substitution lines

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Chinese Science Bulletin 1999年第4期44卷 344-348页

作者： jianxin ma Ronghua Zhou Yuchen Dong Jizeng Jia Chinese Acad Agr Sci Inst Crop Germplasm Resources Beijing 100081 Peoples R China

A set of T. aestivum-L. elongatum substitution lines were studied on yellow rust resistance at seedling stage, inheritance of the resistance and esterase-5 (Est-5) analysis. The results demonstrated that L. elongatum carried a new yellow rust resistance gene(s), which was dominant and located on chromosome 3E of L. elongatum. The biochemical locus encoding Est-5 was also located on chromosome 3E, and was tentatively named Est-E5, which was co-segregant with the Yr gene(s) in wheat background. In addition, the transmission frequencies of chromosome 3E in 3A/3E and 3D/3E hybrids selfing were significantly higher than that of chromosome 3E in 3B/3E hybrid, which was probably due to the difference on genetic relationships among A, B, D and E genomes.

关键词： Triticum aestivum-Lophopyrum elongatum substitution lines yellow rust resistance gene location biochemical marker.

Influence of PTFE on Electrode Structure for Performance of PEMFC and 10-Cells Stack

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Chinese Journal of Mechanical Engineering 2012年第6期25卷 1171-1175页

作者： LIN Rui ZHAO Tiantian ZHANG Haiyan CAO Chunhui LI Bing ma jianxin Clean Automotive Engineering Center Tongji University Shanghai 201804 China School of Automotive Studies Tongji University Shanghai 201804 China School of Resource and Environmental Engineering East China University of Science of Technology Shanghai 200237 China

Water plays a critical role on the performance, stability and lifetime of proton exchange membrane fuel cells（PEMFCs）. The addition of poly tetrafluoroethylene（PTFE） to the gas diffusion layer, especially, the cathode side, would optimize the transportation of water, electron and gas and thus improve the performance of the fuel cell. But until now, the studies about directly applying the PTFE to the catalyst layer are rarely reported. In this paper, the membrane electrode is fabricated by using directly coating catalyst to the membrane method（CCM） and applying PTFE directly to the cathode electrode catalyst layer. The performance of the single cell is determined by polarization curves and durability tests. Electrochemical impedance spectroscopy（EIS） and scanning electron microscopy（SEM） techniques are used to characterize the electrochemical properties of PEMFC. Also the performance of a 10-cells stack is detected. Combining the performance and the physical-chemistry characterization of PEMFC shows that addition of appropriate content of PTFE to the electrode enhances the performance of the fuel cell, which may be due to the improved water management. Addition of appropriate content of PTFE enhances the interaction between the membrane and the catalyst layer, and bigger pores and highly textured structure form in the MEA, which favors the oxygen mass transfer and protons transfer in the fuel cell. While superfluous addition of PTFE covers the surface of catalysts and hindered the contact of catalyst with Nation, which leads to the reduction of electrochemical active area and the decay of the fuel cell performance. The proposed research would optimize the water management of the fuel cell and thus improve the performance of the fuel cell.

关键词： proton exchange membrane fuel cell poly-tetrafluoroethylene electrochemical impedance spectroscopy scanning electron microscopy fuel cell stack

Multi-functional Photoelectric Sensor Based on a Three-fold Interpenetrated Cd(II)Coordination Polymer for Sensitive Detecting Different Ions

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Chemical Research in Chinese Universities 2022年第4期38卷 1105-1110页

作者： WANG Yue WANG Jinling ma jianxin ZHANG Yue XU Na WANG Xiuli Professional Technology Innovation Center of Liaoning Province for Conversion materials of Solar Cell College of Chemistry and Materials EngineeringBohai UniversityJinzhou121013P.R.China

Athree-fold interpenetrated cadmium coordination polymer[Cd_(3)(BTC)_(2)(H_(2)O)_(9)]·2H_(2)O(CP 1)(H_(3)BTC=1,3,5-benzenetricarboxylic acid)was selected and synthesized to investigate its photoelectric *** 1 showed excellent sensitivity for Cr_(2)O_(7)^(2−)and Fe^(3+),low limit of detection(LOD:0.39µmol/L for Cr_(2)O_(7)^(2−)and 1.72µmol/L for Fe^(3+))and stability as electrochemical *** importantly,fluorescence sensing studies indicated that CP 1 exhibits sensing activity for Fe^(3+),Fe^(2+),and MnO_(4)−with good cyclic stability and *** LOD and high-sensitivity capability of CP 1 make it a potential multifunctional photoelectric sensor.

关键词： Coordination polymer Photoelectric sensor Electrochemistry sensing Fluorescence sensing Cr_(2)O_(7)^(2−)and MnO_(4)^(−)

Distribution and Ecological Risk Assessment of HCHs and DDTs in Surface Seawater and Sediment of the mariculture Area of Jincheng Bay,China

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Journal of Ocean University of China 2015年第2期14卷 301-308页

作者： HU Yanbing SUN Shan SONG Xiukai ma jianxin RU Shaoguo College of marine Life Sciences Ocean University of China Provincial Key Laboratory of Restoration for marine Ecology of Shandong Shandong Marine Resource and Environment Research Institute Research Center for the Environment Administration and Development Strategy Third Institute of Oceanography State Oceanic Administration

The distribution of hexachloroeyclohexanes （HCHs） and dichlorodiphenyltrichloroethanes （DDTs） in the surface sea- water and sediment of Jincheng Bay mariculture area were investigated in the present study. The concentration of total HCHs and DDTs ranged from 2.98 to 14.87ngL-l and were〈0.032ngL-1, respectively, in surface seawater, and ranged from 5.52 to 9.43 and from 4.11 to 6.72 ng g-l, respectively, in surface sediment. It was deduced from the composition profile of HCH isomers and DDT congeners that HCH residues derived from a mixture of technical-grade HCH and lindane whereas the DDT residues derived from technical-grade DDT and dicofol. Moreover, both HCH and DDT residues may mainly originate from historical inputs. The hazard quotient of α-HCH, β-HCH, γ-HCH and δ-HCH to marine species was 0.030, 0.157, 3.008 and 0.008, respectively. It was estimated that the overall probability of adverse biological effect from HCHs was less than 5%, indicating that its risk to seawater column spe- cies was low. The threshold effect concentration exceeding frequency of γ-HCH, p,p＇-DDD, p,p＇-DDE and p,p＇-DDT in sediment ranged from 8.3% to 100%, and the relative concentration of the HCH and DDT mixture exceeded their probable effect level in sediment. These findings indicated that the risk to marine benthos was high and potentially detrimental to the safety of aquatic prod- ucts, e.g., sea cucumber and benthic shellfish.

关键词： DDT ecological risk assessment HCH mariculture area organochlorine pesticide sediment quality guideline

Molecular mapping of a novel yellow rust resistance gene of wheat using microsatellite markers

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Chinese Science Bulletin 1999年第19期44卷 1774-1778页

作者： jianxin ma Ronghua Zhou Yuchen Dong Xiaoming Wang Jizeng Jia Chinese Acad Agr Sci Inst Crop Germplasm Resources Beijing 100081 Peoples R China Minist Agr Key Lab Crop Germplasm Resources & Biotechnol Beijing 100081 Peoples R China

Identification and genetic analysis of yellow rust resistance have suggested that wheat line R55 carries single dominant gene conferring yellow rust resistance. The bulked segregant analysis (BSA) for an F2 population using microsatellite marker technique has indicated that the yellow rust resistance gene is located on the short arm of chromosome 1B, tightly linked to

关键词： mlcrosatellite markers gene mapping yellow rust wheat.

An Event-Triggered Energy-Efficient Clustering in Collaborative Beamforming for Wireless Sensor Networks

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Journal of Harbin Institute of Technology(New Series) 2016年第5期23卷 8-14页

作者： jianxin ma Shuo Shi Si Tian Xuemai Gu Communication Research Centre Harbin Institute of Technology

In this paper, we present a protocol, CEWEC （Collaborative, Event-Triggered, Weighted, Energy-Efficient Clustering） , based on collaborative beamfor^ning. It is designed for wireless sensor nodes to realize the long-distance transmission. In order to save the energy of sensor nodes, a node ＂wakes up ＂when it has data to be uploaded. In our protocol, multi-layer structure is adopted： trigger-node layers, clusterhead-node layers, child- node layers. The number of child nodes and clusterheads depends on the distance of transmission. Clusterheads are selected according to the node 5 s weight which is based on its residual energy and distance to the trigger node. The main characteristic of this protocol is that clusterheads can directly communication with each other without the large-scale base station and antennas. Thus, the data from the trigger node would be able to be shared within the multi-layer structure. Considering the clustering process, energy model, and success rate, the simulation results show that the CEWEC protocol can effectively manage a large number of sensor nodes to share and transmit data.

关键词： Sensor networks clustering collaborative beamfomiing energy efficiency network lifetime

A Post-domestication Mutation, Dt2, Triggers Systemic Modification of Divergent and Convergent Pathways Modulating Multiple Agronomic Traits in Soybean

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Molecular Plant 2019年第10期12卷 1366-1382页

作者： Dajian Zhang Xutong Wang Shuo Li Chaofan Wang Michael JGosney Michael VMickelbart jianxin ma Department of Agronomy Purdue UniversityWest LafayetteIN 47907USA College of Agronomy Shandong Agricultural UniversityTai'anShandong 271018China School of Life Sciences Shandong UniversityQingdaoShandong 266237China Department of Botany and Plant Pathology Purdue UniversityWest LafayetteIN 47907USA Center for Plant Biology Purdue UniversityWest LafayetteIN 47907USA

The semi-determinate stem growth habit in leguminous crops,similar to the“green revolution”semi-dwarf trait in cereals,is a key plant architecture trait that affects several other traits determining grain *** soybean semi-determinacy is modulated by a post-domestication gain-of-function mutation in the gene,Dt2,which encodes an maDS-box transcription ***,its role in systemic modification of stem growth and other traits is *** this study,we show that Dt2 functions not only as a direct repressor of Dt1,which prevents terminal flowering,but also as a direct activator of putative floral integrator/identity genes including GmSOC1,GmaP1,and GmFUL,which likely promote *** also demonstrate that Dt2 functions as a direct repressor of the putative drought-responsive transcription factor gene GmDREB1D,and as a direct activator of GmSPCH and GmGRP7,which are potentially associated with asymmetric division of young epidermal cells and stomatal opening,respectively,and may affect the plant's water-use efficiency(WUE).Intriguingly,Dt2 was found to be a direct activator or repressor of the precursors of eight microRNAs targeting genes potentially associated with meristem maintenance,flowering time,stomatal density,WUE,and/or stress *** study thus reveals the molecular basis of pleiotropy associated with plant productivity,adaptability,and environmental resilience.

关键词： abiotic stress agronomic traits convergent pathways stem growth habit pleiotropy soybean

Daily variation of carbon flux in soils of Populus euphratica forests in the middle and lower reaches of the Tarim River

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Progress in Natural Science:materials International 2007年第5期17卷 584-590页

作者： Huang Xiang , Chen Yaning , Li Weihong , ma jianxin and Chen Yapeng (Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China Graduate University, Chinese Academy of Sciences, Beijing 100039, China) [a]Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi China [b]Chinese Academy of Sciences Graduate University Beijing China

In order to lucubrate the daily variation of respiration in soils of Populus euphratica forests and analyze its relationship with environmental factors in the middle and lower reaches of the Tarim River, the LI-8100 instrument of soil CO2 flux system was used to measure the parameters of soil carbon flux and air temperature 10 cm above ground surface along the profiles of Usyman, Archy River, Yengisu and Karday, and the relationships between the soil carbon flux and the soil moisture content were analyzed. The nonlinear regression analysis was carried out with the software SPSS13.0. We observed that: (1) soil respiration began to be restrained when the air temperature was up to 30℃10 cm above the ground surface; (2) the rates of soil respiration under the forests of Populus euphratica were significantly different at various moisture contents, the soil carbon flux was high along the Usyman profile, which has a high soil moisture content, and it was low along the profiles of Archy River, Yengisu and Karday, which has a low soil moisture content; (3) the exponential model can be used to explain the relationship between soil respiration and air temperature 10 cm above the ground surface. The average Q10 values along the profiles of Usyman, Archy River, Yengisu and Karday are 0. 61, 0.16, 0. 22 and 0. 35 respectively, much lower than the average of the world; (4) there is a positive correlation between the soil carbon flux and the soil moisture content.

关键词： Populus euphratica soil carbon flux air temperature 10 cm above ground surface soil moisture content the Tarim River.

Research Report on the Effect of Network Teaching Mode of Art Courses under the Concept of Ideological and Political Education

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Review of Educational Theory 2021年第1期4卷 20-23页

作者： Meina mao jianxin ma Hang Xia Yifan He Union University of Beijing Beijing100101China

Since the National Conference on ideological and political work in Colleges and Universities,the Party Committee of Beijing United University has closely focused on the fundamental problem of“what kind of person to train,how to train and for whom to train”,and regards the course of ideological and political thinking as the fundamental measure to carry out the fundamental task of building up people by *** 2020,in the event of the new epidemic situation,the school actively implemented the work plan of“stopping classes and not stopping learning”in Beijing,and opened the historic revolution of the whole school network teaching in education and *** recent years,Beijing Union University in the“curriculum ideological and political”construction is constantly open *** order to promote teaching practice and teaching research,the school teacher teaching development center set up the first teaching promoters of Beijing United University in *** project team was set up by the school teaching promoters to study the effect of the online teaching mode of art courses under the concept of ideological and political education.

关键词： Ideological and Political Course Art Network teaching