检索结果-南通市图书馆

苝二酰亚胺类光敏剂及其与氮磷钾叶面肥复配对油菜生长发育的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国农学通报 2024年第14期40卷 54-63页

作者：程澳华申江英苏秀荣孟娇孟庆羽洪丕征王海卫何利宁山东农业大学化学院山东泰安271000 山东农大肥业科技股份有限公司山东泰安271000 农业农村部腐植酸类肥料重点实验室山东泰安271000 泰安市农业技术推广中心山东泰安271000

旨在研究苝二酰亚胺类光敏剂及其与氮磷钾叶面肥复配对油菜生长发育的影响,以1,7-二溴-3,4,9,10-苝四羧基双酐(PDI-2Br)为受体,环己胺为给体制备N,N’-二环己基-1,7-二环己胺基-3,4,9,10-苝二酰亚胺(PDI-4CHA),随后在PDI-4CHA表面包裹... 详细信息

旨在研究苝二酰亚胺类光敏剂及其与氮磷钾叶面肥复配对油菜生长发育的影响,以1,7-二溴-3,4,9,10-苝四羧基双酐(PDI-2Br)为受体,环己胺为给体制备N,N’-二环己基-1,7-二环己胺基-3,4,9,10-苝二酰亚胺(PDI-4CHA),随后在PDI-4CHA表面包裹纳米硅壳得到PDI-4CHA复合纳米胶囊(光敏剂,PS)。以油菜为试验材料,研究PS最佳喷施浓度,设置CK、0.4%PS、1.2%PS、2%PS、3%PS 5个处理;研究光敏剂与氮磷钾叶面肥W复配(PS&W)处理对油菜生长发育的影响,设置CK、叶面肥W、2%PS、0.4%PS&W、1.2%PS&W、2%PS&W 6个处理。结果表明:成功合成PDI-4CHA复合纳米胶囊;PS喷施浓度在0%~3%范围内,2%PS处理对油菜的促进效果最好,与CK相比,在最后一次取样中油菜SPAD值、干重、鲜重分别提高了21.93%、60.72%、44.93%;PS&W处理对油菜生长影响实验显示,相较于CK、W和PS处理,1.2%PS&W处理在最后一次取样中油菜的鲜重分别增高了161.43%、173.90%和105.46%,干重分别增高了163.98%、173.92%和107.64%,并且复配处理过的油菜的品质均不差于对照处理。该实验证明苝二酰亚胺类光敏剂及其与氮磷钾叶面肥复配喷施对油菜有增效作用。

关键词：苝二酰亚胺光敏剂增效作用油菜

维普期刊数据库

Insertion sequence transposition activates antimycobacteriophage immunity through an Isr2-silenced lipid metabolism gene island

在线全文

学校读者我要写书评

暂无评论

mLife 2024年第1期3卷 87-100页

作者： Yakun Li Yuyun Wei Xiao Guo Xiaohui Li lining Lu Lihua Hu Zheng-Guo he State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Guangxi Research Center for Microbial and Enzyme Engineering TechnologyCollege of Life Scienceand TechnologyGuangxi UniversityNanningChina

Insertion sequences(ISs)exist widely in bacterial genomes,but their roles in the evolution of bacterial antiphage defense remain to be ***,we report that,under the pressure of phage infection,the IS1o96 transposition of Mycobacterium smegmatis into the Isr2 gene can occur at high frequencies,which endows the mutant mycobacterium with a broad-spectrum antiphage ***2 functions as a negative regulator and directly silences expression of a gene island composed of 11 lipid metabolism-related *** complete or partial loss of the gene island leads to a significant decrease of bacteriophage adsorption to the mycobacterium,thus defending against phage ***,a phage that has evolved mutations in two tail-filament genes can re-escape from the Isr2 inactivation-triggered host *** study uncovered a new signaling pathway for activating antimycobacteriophage immunity by Is transposition and provided insight into the natural evolution of bacterial antiphage defense.

关键词： antiphage defense bacteriophage gene island insertion sequence mycobacteria

In situ direct reprogramming of astrocytes to neurons via polypyrimidine tract-binding protein 1 knockdown in a mouse model of ischemic stroke

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第10期19卷 2240-2248页

作者： Meng Yuan Yao Tang Tianwen Huang lining Ke En Huang Key Laboratory of Brain Aging and Neurodegenerative Diseases of Fujian Province Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Human Anatomy School of Basic Medical SciencesFujian Medical UniversityFuzhouFujian ProvinceChina Scientific Research Center School of Basic Medical SciencesFujian Medical UniversityFuzhouFujian ProvinceChina Department of Neurology Fujian Medical University Union HospitalFuzhouFujian ProvinceChina Fujian Key Laboratory of Vascular Aging Fujian Medical UniversityFuzhouFujian ProvinceChina

In situ direct reprogramming technology can directly convert endogenous glial cells into functional neurons in vivo for central nervous system repair. Polypyrimidine tract-binding protein 1(PTB) knockdown has been shown to reprogram astrocytes to functional neurons in situ. In this study, we used AAV-PHP.e B-GFAP-sh PTB to knockdown PTB in a mouse model of ischemic stroke induced by endothelin-1, and investigated the effects of GFAP-sh PTB-mediated direct reprogramming to neurons. Our results showed that in the mouse model of ischemic stroke, PTB knockdown effectively reprogrammed GFAP-positive cells to neurons in ischemic foci, restored neural tissue structure, reduced inflammatory response, and improved behavioral function. These findings validate the effectiveness of in situ transdifferentiation of astrocytes, and suggest that the approach may be a promising strategy for stroke treatment.

关键词： astrocyte in situ direct reprogramming ischemic stroke miR-30 based shRNA neuron polypyrimidine tract-binding protein 1 transdifferentiation

维普期刊数据库

Exploring luminescence quenching on lanthanide-doped nanoparticles through changing the spatial distribution of sensitizer and activator

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第5期17卷 4517-4524页

作者： Jiwei Li Yao Xie Renrui Sun Junxun Zhou lining Sun Department of Chemistry College of SciencesShanghai UniversityShanghai 200444China Department of Physics College of SciencesShanghai UniversityShanghai 200444China School of Medicine Shanghai UniversityShanghai 200444China

Luminescence quench is common in overdoped upconversion *** methods have been proposed to counteract the adverse effects of concentration quenching on luminescence,but in upconversion nanoparticles that are highly doped with both sensitizers and activators,the factors that contribute to the diminishing of the emission cannot be summarized by a single ***,a core-shell design is used to spatially separate the sensitizer(Yb^(3+))and activator(Er^(3+))and to modulate the emission by changes in the distribution position as well as the concentration of the dopant ions in order to probe the factors affecting the *** the sensitizer ions are located in the core,the luminescence intensity of the nanoparticles is significantly weaker than that of the other distribution,which implies that the effect of sensitizer and activator on luminescence in the highly doped state has a different and more complex *** intensity of the emission is more affected by Yb^(3+)than Er^(3+),which includes not only the self-quenching of Yb^(3+),but also the dominance in the Yb^(3+)-Er^(3+)*** this finding may provide new ideas for revealing the reasons for the diminished luminescence of highly doped upconversion nanoparticles and thus for enhancing luminescence.

关键词： upconversion luminescence lanthanide ion core-shell nanoparticles concentration quenching cross-relaxation

马铃薯苗期叶片喷施不同浓度腐植酸对低温胁迫的生理响应

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国农学通报 2024年第17期40卷 28-35页

作者：郭新送黄剑刘晓辰洪丕征范仲卿何利宁刘同信赵花丁方军王海卫王坤农业部腐植酸类肥料重点实验室山东农大肥业科技股份有限公司山东泰安271600 泰安市农技推广中心山东泰安271600

山东是中国典型的马铃薯春薯种植区,春种马铃薯苗期易受到偶发性的低温冷害,其已成为山东春季马铃薯生产中重要的非生物胁迫因素。马铃薯遭受低温冷害后若不采取补救措施轻则减产重则绝收。本研究中模拟马铃薯-2℃的低温胁迫,经低温胁迫... 详细信息

山东是中国典型的马铃薯春薯种植区,春种马铃薯苗期易受到偶发性的低温冷害,其已成为山东春季马铃薯生产中重要的非生物胁迫因素。马铃薯遭受低温冷害后若不采取补救措施轻则减产重则绝收。本研究中模拟马铃薯-2℃的低温胁迫,经低温胁迫3 d后设置喷施0.2%、0.4%、0.6%、0.8%浓度腐植酸,通过检测喷施不同浓度腐植酸后的马铃薯生理生化指标,探索出喷施腐植酸对马铃薯低温冷害的缓解效应,摸清马铃薯受低温冷害后腐植酸的最佳喷施浓度。结果表明:低温胁迫下,喷施腐植酸可提高马铃薯叶片含水率,降低叶片电导率来对抗冷害,同时能够提高叶片叶绿素a含量,增强光合能力;低温胁迫下,喷施腐植酸显著影响了马铃薯苗期叶片的抗氧化系统,表现为提高叶片可溶性蛋白含量,提高马铃薯叶片内抗氧化物酶活性,降低植物体内过氧化物质的累积量,保证植物体内常规的氧化还原电位,增强了其抗寒能力。在恢复长势上喷施0.6%~0.8%浓度腐植酸效果较好,在提高叶片抗氧化系统酶活性上喷施0.4%~0.6%浓度腐植酸效果表现较好。

关键词：低温胁迫马铃薯腐植酸可溶性蛋白叶绿素抗氧化物酶过氧化物质

维普期刊数据库

Reinforcement Learning Navigation for Robots Based on Hippocampus Episode Cognition

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第1期21卷 288-302页

作者： Jinsheng Yuan Wei Guo Zhiyuan Hou Fusheng Zha Mantian Li Pengfei Wang lining Sun State Key Laboratory of Robotics and System Harbin Institute of Technology(HIT)Harbin 150001China Shenzhen Academy of Aerospace Technology Shenzhen 518057China School of Mechanical and Electrical Engineering Lanzhou University of TechnologyLanzhou 730050China

Artificial intelligence is currently achieving impressive success in all ***,autonomous navigation remains a major challenge for *** learning is used for target navigation to simulate the interaction between the brain and the environment at the behavioral level,but the Artificial Neural Network trained by reinforcement learning cannot match the autonomous mobility of humans and *** hippocampus–striatum circuits are considered as key circuits for target navigation planning and *** paper aims to construct a bionic navigation model of reinforcement learning corresponding to the nervous system to improve the autonomous navigation performance of the *** ventral striatum is considered to be the behavioral evaluation region,and the hippocampal–striatum circuit constitutes the position–reward *** this paper,a set of episode cognition and reinforcement learning system simulating the mechanism of hippocampus and ventral striatum is constructed,which is used to provide target guidance for the robot to perform autonomous *** with traditional methods,this system reflects the high efficiency of learning and better Environmental *** research is an exploration of the intersection and fusion of artificial intelligence and neuroscience,which is conducive to the development of artificial intelligence and the understanding of the nervous system.

关键词： Episode cognition Reinforcement learning Hippocampus Robot navigation

A strong physical unclonable function with machine learning immunity for Internet of Things application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第1期67卷 271-283页

作者： Pengpeng REN Yongkang XUE Linglin JING lining ZHANG Runsheng WANG Zhigang JI National Key Laboratory of Science and Technology on Micro/Nano Fabrication Shanghai Jiao Tong University Department of Micro/Nano Electronics Shanghai Jiao Tong University School of Electronic and Computer Engineering Peking University School of Integrated Circuits Peking University

The physical unclonable functions(PUFs) are novel cryptographic primitives in modern hardware security *** with traditional alternatives based on digital keys and non-volatile memory(NVM),the PUF system shows great unclonability,high efficiency,and physical attack ***,the conventional PUF design suffers from weak machine learning immunity,high storage overhead,and unreliability,making it difficult to implement in the Internet of Things(Io T) and edge computing *** paper presents a new PUF design that could solve the proposed *** utilizing the emission probability of traps commonly found in nano-scaled transistors,a model-based PUF system with strong machine learning resistance could be *** PUF design,called Prob-PUF,needs fewer challengeresponse pairs(CRPs) space and reveals superior resistance to modeling attacks due to the mixture of stable/random bits in its output ***,the Prob-PUF system could reach a high level of uniqueness and robustness,making it a potential candidate for future cryptographically secured protocols within the IoT.

关键词： physical unclonable function (PUF) electron traps authentication encryption cryptography security

Histopathological Observation of Goose Escherichia coli Disease

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2013年第5期2卷 28-31页

作者： Ping SheN Guangping GAO Guisheng GAO Yanying ZHANG Qiumei SHI Xinhua SHAO lining he Wenwen SU Key Laboratory of Preventive Veterinary Medicine of hebei Province Hebei Normal University of Science and Technology hebei Xinhua Animal Drug Co. Ltd. Shijiazhuang Institute of Veterinary Drug Control

[ Objective] This study aimed to provide reliable basis for in-depth understanding of histopathological changes in geese suffering from Escherichia coli disease and accurate diagnosis of goose E. coli disease. [ Method] By using paraffin embedding, section slicing and he staining, histopathological changes in the heart, liver, spleen, lung, kidney and small intestine tissues of three diseased geese were observed. [ Result] The liver generated protein fiber membranes, showing liver cell degeneration, increasing number of red blood cells in sinusoids and liver congestion; the kidney had relatively serious lesions, including renal tubular epithelial cell degeneration, necrosis and shedding from the basement membrane and hyaline degeneration of glomerulars. The lung showed epithelial cell degeneration and necrosis and was filled with a large number of red blood cells and shedded epithelial cells, showing typical red hepatization; a large number of red blood ceils were aggregated in pulmonary blood vessels, resulting in lung congestion. Epithelial ceils of various digestive tubes all showed varying degrees of minor shed- ding and local infiltration of inflammatory ceils, thereby leading to death of geese due to substance metabolism, electrolyte and acid-base balance disorders and metabolic acidosis. [ Conclusion] Based on epidemiology survey, clinical symptom observation, pathological necropsy and laboratory diagnosis, the diseased geese were confirmed to be suffering from E. coli disease.

关键词： Goose Escherichia coli Histopathology Observation

Interactive effect of thermal aging and proton irradiation on microstructural evolution and hardening ofδ-ferrite in 308L stainless steel weld metal

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第3期170卷 140-155页

作者： Xiaodong Gao Xiaodong Lin Tao Guo lining Xu Yaolei Han Baolong Jiang Xingyuan Mei Qunjia Peng Lijie Qiao Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Institute of Materials Shanghai UniversityShanghai 200072China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Suzhou Nuclear Power Research Institute Suzhou 215004China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

In the harsh service environment of high temperature and intense neutron irradiation in water-cooled nuclear reactors,the austenitic stainless steel weld overlay cladding on the inner surface of the reactor pressure vessel suffers from thermal aging and irradiation damage simultaneously,which can induce microstructural evolution and hardening of the *** it is quite difficult to achieve this simul-taneous process out of the pile,two kinds of combined experiments,i.e.,post-irradiation thermal aging and post-aging irradiation were performed on 308 L stainless steel weld metals in this *** interactive effect of thermal aging and proton irradiation on microstructural evolution and hardening ofδ-ferrite in 308 L weld metal was investigated by combining atom probe tomography,transmission elec-tron microscopy and nanoindentation *** results revealed that thermal aging could eliminate the dislocation loops induced by irradiation and affect the phase transition process by accelerating spinodal decomposition and G-phase precipitation,thus enhancing hardening of irradiatedδ-*** the effect of irradiation on the microstructure and hardening of thermally agedδ-ferrite,however,intensive collision cascades can intensify G-phase precipitation and dislocation loop formation but decrease spinodal decomposition,leading to a limited effect on hardening of thermally agedδ-***,the interaction of thermal aging and irradiation can promote G-phase ***,the interaction can causeδ-ferrite hardening,which is mainly influenced by spinodal decomposition,followed by G-phase and dislocation loops,where spinodal decomposition and G-phase cause hardening by inducing strain fields.

关键词： Austenitic stainless steel weld metals Thermal aging Proton irradiation Interaction Microstructural evolution Hardening