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低浓度吡虫啉削弱多异瓢虫对棉花植株挥发物的嗅觉识别功能

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昆虫学报 2024年第2期67卷 193-202页

作者：色晨晨张涛戴长春张蒙皓于洪春陆宴辉东北农业大学植物保护学院哈尔滨150030 中国农业科学院植物保护研究所植物病虫害综合治理国家重点实验室北京100193 河北省农林科学院植物保护所保定071000 中国农业科学院西部农业研究中心昌吉831100

【目的】明确低浓度吡虫啉对多异瓢虫Hippodamia variegata成虫嗅觉行为的影响。【方法】采用Y型嗅觉仪测定多异瓢虫成虫在摄入低浓度(LC_(20)和LC_(50))吡虫啉后对健康棉株和棉蚜Aphis gossypii成蚜为害棉株挥发物的行为反应;并通过固... 详细信息

【目的】明确低浓度吡虫啉对多异瓢虫Hippodamia variegata成虫嗅觉行为的影响。【方法】采用Y型嗅觉仪测定多异瓢虫成虫在摄入低浓度(LC_(20)和LC_(50))吡虫啉后对健康棉株和棉蚜Aphis gossypii成蚜为害棉株挥发物的行为反应;并通过固相微萃取收集健康棉株和棉蚜成蚜为害棉株的挥发物,以气相色谱-质谱联用仪分析鉴定挥发物成分;进而测试多异瓢虫成虫对棉株挥发物单一组分的选择行为。【结果】未摄入吡虫啉的多异瓢虫成虫对棉蚜成蚜为害的棉株具有显著的正趋性,但对健康棉株和清洁空气均无显著的趋向性;摄入低浓度吡虫啉的多异瓢虫成虫对棉蚜成蚜为害的棉株、健康棉株以及清洁空气均无显著的趋向性。对比健康棉株,从棉蚜成蚜为害棉株的挥发物中鉴定出8种挥发量显著增加的化合物,分别为月桂烯、柠檬烯、1-癸炔、3-蒈烯、(3E)-4,8-二甲基-1,3,7-壬三烯[(3E)-4,8-dimethyl-1,3,7-nonatriene, DMNT]、β-石竹烯、α-葎草烯、(3E, 7E)-4,8,12三甲基十三碳-1,3,7,11-四烯[(3E, 7E)-4,8,12-trimethyltrideca-1,3,7,11-tetraene, TMTT]。利用Y型嗅觉仪测定多异瓢虫成虫对以上8种物质的嗅觉选择行为发现,未摄入吡虫啉的多异瓢虫成虫对TMTT具有显著的正趋性,对其他7种挥发性化合物无显著趋性,而摄入低浓度吡虫啉的多异瓢虫成虫对8种挥发性化合物均无显著正趋性。在行为选择测试中,低浓度吡虫啉处理后的多异瓢虫成虫对棉株挥发物及单一组分的未选择个体数量均显著多于对照组。【结论】研究结果证实低浓度吡虫啉削弱了多异瓢虫成虫对棉花植株挥发物的嗅觉识别功能,为新疆棉田多异瓢虫的保护利用及棉田农药的合理使用提供科学依据。

关键词：多异瓢虫吡虫啉嗅觉选择行为挥发物亚致死效应

Fuzzy Shape Control Based on El man Dynamic Recursion Network Prediction Model

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Journal of Iron and Steel Research International 2006年第1期13卷 31-35页

作者： JIA chun-yu LIU hong-min College of Mechanical Engineering Yanshan University Qinhuangdao 066004 Hebei China

In the strip rolling process, shape control system possesses the characteristics of nonlinearity, strong coupling, time delay and time variation. Based on self adapting Elman dynamic recursion network prediction model, the fuzzy control method was used to control the shape on four-high cold mill. The simulation results showed that the system can be applied to real time on line control of the shape.

关键词： shape prediction shape control Elman dynamic recursion network parameter self-adjusting fuzzy control

森林草原防灭火措施初探与思考——以四川省冕宁县为例

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森林防火 2024年第1期42卷 60-63页

作者：王庆辉余春红王芬冕宁县泸沽镇农业农村综合服务中心四川凉山彝族自治州615600 冕宁县林业和草原局四川冕宁615600 冕宁县锦屏镇宣传文化服务中心四川凉山彝族自治州615600

针对冕宁县森林草原防灭火工作现状及问题,提出森林草原防灭火亟待解决的对策和建议,为促进冕宁县防火工作提供参考。

关键词：森林防灭火措施对策探索做法结论与思考

Inhibition of Erythroid Differentiation of Human Leukemia K562 Cells by N-acetylcysteine and Ascorbic Acid through Downregulation of ROS

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Biomedical and Environmental Sciences 2018年第3期31卷 247-251页

作者： yu chun hong JIANG Liang WANG Ying CUI Ning Xuan ZHAO Xiao YI Zong chun School of Biological Science and Medical Engineering Beihang University

This study investigated the effects of N-acetylcysteine（NAC）and ascorbic acid（AA）on hemin-induced K562 cell erythroid differentiation and the role of reactive oxygen species（ROS）in this *** increased ROS levels ... 详细信息

关键词： ROS NAC

The Role of ROS in Hydroquinone-induced Inhibition of K562 Cell Erythroid Differentiation

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Biomedical and Environmental Sciences 2014年第3期27卷 212-214页

作者： yu chun hong Suriguga LI Yang LI Yi Ran TANG Ke Ya JIANG Liang YI Zong chun School of Biological Science and Medical Engineering Beihang University

The role of ROS in hydroquinone-induced inhibition of K562 cell erythroid differentiation was investigated. After K562 cells were treated with hydroquinone for 24 h, and hemin was later added to induce erythroid differentiation for 48 h, hydroquinone inhibited hemin-induced hemoglobin synthesis and mRNA expression of y-globin in K562 cells in a concentration-dependent manner. The 24-h exposure to hydroquinone also caused a concentration-dependent increase at an intracellular ROS level, while the presence of N- acetyI-L-cysteine prevented hydroquinone- induced ROS production in K562 cells. The presence of N-acetyI-L-cysteine also prevented hydroquinone inhibiting hemin-induced hemoglobin synthesis and mRNA expression of y-globin in K562 cells. These evidences indicated that ROS production played a role in hydroquinone-induced inhibition of erythroid differentiation.

关键词： ROS NAC

Concerted Steric and Electronic Strategy in Thermostable Salicylaldiminato Nickel Catalysts for Ethylene(Co)polymerization

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Chinese Journal of Polymer Science 2024年第8期42卷 1085-1092页

作者： hong-yu Ji hong-Liang Mu chun-Feng Tang yu-Xing Zhang yue Chi Zhong-Bao Jian Key Laboratory of Advanced Structural Materials Ministry of EducationSchool of Materials Science and EngineeringChangchun University of TechnologyChangchun 130012China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Olefin polymerization is one of the most im portant chemical reactions in *** work presents a strategy that emphasizes the synergistic meta/poro-steric hindrance of N-aryl groups and electronic effects in newly synthesized neutral salicylaldiminato nickel *** nickel(Ⅱ)catalysts exhibit exceptional thermostability,ranging from 30℃to 130℃,demonstrating enhanced catalytic activities and broadly regulated polyethylene molecular weights(3-341 kg·mol^(-1))and controlled polymer branch density(2-102 brs/1000C).The preferred catalyst Ni3 with concerted steric and electronic effects enables the production of solid-state semi-crystalline polyethylene materials at temperatures below 90℃.Notably,Ni3 exhibits an impressive tolerance of 110℃and can withstand even the challenging polymerization temperature of 130℃,leading to the production of polyethylene wax and ***,functionalized polyethylene is produced.

关键词： Polyolefin Salicylaldiminato ligand Nickel catalyst Oil Wax

Cathode-Control Alloying at an Au-ZnSe Nanowire Contact via in Situ Joule Heating

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Chinese Physics Letters 2012年第8期29卷 269-271页

作者： ZENG Ya-Ping WANG Yan-Guo QU Bai-Hua yu hong-chun Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education Hunan UniversityChangsha 410082 Beijing Laboratory of Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190

Controllable interfacial alloying is achieved at a Au-ZnSe nanowire(M-S)contact via in situ Joule heating inside transmission electron microscopy(TEM).TEM inspection reveals that the Au electrode is locally molten at the M-S contact and the tip of the ZnSe nanowire is covered by the Au *** evidences confirm that the alloying at the reversely biased M-S contact is due to the high resistance of the Schottky barrier at this M-S contact,coincident to cathode-control ***,in situ Joule heating can be an effective method to improve the performance of nanoelectronics based on a metal-semiconductor-metal nanostructure.

关键词： alloying resistance Cathode

Microstructure Evolution and Nanomechanical Behavior of Micro-Area in Molten Pool of Selective Laser Melting(CoCrNi)_(82)Al_(9)Ti_(9)High-Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 1019-1033页

作者： hong-Wei Zhang Li-Wei Lan Zhe-yu Yang Chang-chun Li Wen-Xian Wang College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced MaterialsTaiyuan University of TechnologyTaiyuan030024China Shanxi-Zhejiang University New Materials and Chemical Research Institute Taiyuan030032China

In this work,the phase evolution mechanism and nanomechanical properties of(CoCrNi))(82)Al_(9)Ti_(9)high-entropy alloy(HEA)prepared by selective laser melting(SLM)in the molten pool were *** HEA contains multiple primary elements and undergoes high-temperature gradient and rapid cooling during *** leads to significant inhomogeneity of nano-scale microstructure characteristics and instability of *** optimizing process parameters,the microstructure evolution at the optimal parameter volume energy density of 440 J/mm^(3)was studied.A phase transition from BCC to FCC occurred in the melt *** the micro-area of the melt pool results in a temperature rise and the combustion-induced loss of Al ***,the Ni element content increases significantly outside the melt *** process enhances the phase stability of FCC and facilitates phase ***,rapid cooling leads to the formation of distinctive ultrafine equiaxial crystals inside the melt pool,accompanied by the generation of intracrystalline needle-like nano-scale *** the melt pool,the accumulation of energy results in the formation of coarse ***,the nano-hardness inside the molten pool is remarkably high at 11.79 GPa,while the outside the molten pool is reduced to 9.58 *** the fracture toughness outside the melt pool also *** with inside the melt pool,the residual stress outside the melt pool changed from compressive to tensile stress and decreased from 603.28 to 322.84 MPa.

关键词： High-entropy alloys Selective laser melting Microstructure evolution Nanoindentation

吞蛋白A2在非网格蛋白内吞中的作用研究进展

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生物化学与生物物理进展 2017年第1期44卷 44-48页

作者：余春红易宗春北京航空航天大学生物与医学工程学院北京100191

内吞作用是细胞从细胞外空间和内化横跨膜的细胞表面蛋白转运物质到细胞内的过程.吞蛋白(endophilin)一直被认为参与了网格蛋白介导的细胞内吞作用,2015年《自然》(Nature)发表的两篇研究论文报道了一种由endophilin A标记和控制的独立... 详细信息

内吞作用是细胞从细胞外空间和内化横跨膜的细胞表面蛋白转运物质到细胞内的过程.吞蛋白(endophilin)一直被认为参与了网格蛋白介导的细胞内吞作用,2015年《自然》(Nature)发表的两篇研究论文报道了一种由endophilin A标记和控制的独立于网格蛋白的有被囊泡内吞作用.本文主要综述近年来endophilin A2的研究,着重介绍endophilin A2在非网格蛋白介导的内吞作用中的功能和机制.

关键词： EndophilinA2 非网格蛋白介导的内吞 FEME途径膜剪切