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Soybean(Glycine max)rhizosphere organic phosphorus recycling relies on acid phosphatase activity and specific phosphorusmineralizing-related bacteria in phosphate deficient acidic soils

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Journal of Integrative Agriculture 2024年第5期23卷 1685-1702页

作者： Qianqian Chen Qian Zhao Baoxing xie Xing Lu Qi Guo Guoxuan liu Ming Zhou Jihui Tian Weiguo Lu Kang Chen Jiang Tian Cuiyue liang Root Biology Center State Key Laboratory for Conservation and Utilization of Subtropical Agro-BioresourcesCollege of Natural Resources and EnvironmentSouth China Agricultural UniversityGuangzhou 510642China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China Henan Academy of Crops Molecular Breeding Henan Academy of Agricultural SciencesZhengzhou 450002China

Bacteria play critical roles in regulating soil phosphorus(P) cycling. The effects of interactions between crops and soil P-availability on bacterial communities and the feedback regulation of soil P cycling by the bacterial community modifications are poorly understood. Here, six soybean(Glycine max) genotypes with differences in P efficiency were cultivated in acidic soils with long-term sufficient or deficient P-fertilizer treatments. The acid phosphatase(AcP) activities, organic-P concentrations and associated bacterial community compositions were determined in bulk and rhizosphere soils. The results showed that both soybean plant P content and the soil AcP activity were negatively correlated with soil organic-P concentration in P-deficient acidic soils. Soil P-availability affected the ɑ-diversity of bacteria in both bulk and rhizosphere soils. However, soybean had a stronger effect on the bacterial community composition, as reflected by the similar biomarker bacteria in the rhizosphere soils in both P-treatments. The relative abundance of biomarker bacteria Proteobacteria was strongly correlated with soil organic-P concentration and AcP activity in low-P treatments. Further high-throughput sequencing of the phoC gene revealed an obvious shift in Proteobacteria groups between bulk soils and rhizosphere soils, which was emphasized by the higher relative abundances of Cupriavidus and Klebsiella, and lower relative abundance of Xanthomonas in rhizosphere soils. Among them, Cupriavidus was the dominant phoC bacterial genus, and it was negatively correlated with the soil organic-P concentration. These findings suggest that soybean growth relies on organic-P mineralization in P-deficient acidic soils, which might be partially achieved by recruiting specific phoCharboring bacteria, such as Cupriavidus.

关键词： organic phosphorus acid phosphatase soybean bacterial community phoC-harboring bacteria rhizosphere

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A multi-terminal ion-controlled transistor with multifunctionality and wide temporal dynamics for reservoir computing

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Nano Research 2024年第5期17卷 4444-4453页

作者： Kekang liu Jie li Fangzhou li Yiyuan lin Hongrui liu linzi liang Zhiyuan Luo Wei liu Mengye Wang Feichi Zhou Yanghui liu School of Materials Sun Yat-Sen UniversityShenzhen 518107China School of Microelectronics Southern University of Science and TechnologyShenzhen 518055China School of Software East China Jiaotong UniversityNanchang 330013China

Reservoir computing(RC)is an energy-efficient computational framework with low training cost and high efficiency in processing spatiotemporal *** state-of-the-art fully memristor-based hardware RC system suffers from bottlenecks in the computation efficiencies and accuracy due to the limited temporal tunability in the volatile memristor for the reservoir layer and the nonlinearity in the nonvolatile memristor for the readout ***,integrating different types of memristors brings fabrication and integration *** overcome the challenges,a multifunctional multi-terminal electrolyte-gated transistor(MTEGT)that combines both electrostatic and electrochemical doping mechanisms is proposed in this work,integrating both widely tunable volatile dynamics with high temporal tunable range of 10^(2) and nonvolatile memory properties with high long-term potentiation/long-term depression(LTP/LTD)linearity into a single *** ion-controlled physical RC system fully implemented with only one type of MTEGT is constructed for image recognition using the volatile dynamics for the reservoir and nonvolatility for the readout ***,an ultralow normalized mean square error of 0.002 is achieved in a time series prediction *** is believed that the MTEGT would underlie next-generation neuromorphic computing systems with low hardware costs and high computational performance.

关键词： reservoir computing multi-terminal electrolyte-gated transistor ionic controlling rich dynamics nonlinear dynamical prediction

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Spatial-Temporal Analysis of Drinking Water Type of Endemic Fluorosis—China,2009–2022

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China CDC weekly 2024年第2期6卷 25-29页

作者： lijun Zhao Zhe li Mang li Hongna Sun Wei Wei lin Gao Qiaoshi Zhao Yang liu Xiaohong Ji Cheng li Jian Wang Yanhui Gao Junrui Pei Center for Endemic Disease Control Chinese Center for Disease Control and PreventionHarbin Medical UniversityHarbin CityHeilongjiang ProvinceChina Key Lab of Etiology and Epidemiology Education Bureau of Heilongjiang Province(23618504)Ministry of Health of PRHarbin Medical UniversityHarbin CityHeilongjiang ProvinceChina

What is already known about this topic?Endemic fluorosis,caused by high fluoride levels in drinking water,has been a significant health issue in rural areas of China for many *** is added by this report?There has been a notable decline in the detection rate of dental fluorosis in children aged 8–12 years in drinking water fluorosis areas across the country from 2009 to *** 14 provincial-level administrative divisions are classified as low-probability clusters,Tianjin remains classified as a high-probability *** are the implications for public health practice?The current policy for preventing and controlling endemic fluorosis in China needs *** than focusing solely on regions with high incidence,there should be a shift towards monitoring and early warning of fluoride ***,local containment measures should be intensified.

关键词： intensified Spatial fluoride

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大学生学术信息搜寻挫折应对行为研究

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现代情报 2024年第9期44卷 82-94页

作者：黄崑周辰语郭琼皓李蕾北京师范大学政府管理学院北京100875

[目的/意义]学术信息搜寻通常是一个长期、反复、持续的过程,容易遭遇困难阻碍引发挫折。通过探讨大学生应对学术信息搜寻挫折的行为提出促进挫折应对效果的建议。[方法/过程]针对大学生群体,结合挫折应对理论,利用半结构化访谈和内容... 详细信息

[目的/意义]学术信息搜寻通常是一个长期、反复、持续的过程,容易遭遇困难阻碍引发挫折。通过探讨大学生应对学术信息搜寻挫折的行为提出促进挫折应对效果的建议。[方法/过程]针对大学生群体,结合挫折应对理论,利用半结构化访谈和内容分析法,从挫折应对行为类型、应对效果及相关影响因素等方面进行分析,构建大学生学术信息搜寻挫折应对模型。[结果/结论]大学生应对信息搜寻挫折的行为类型主要包括以问题为中心和以情绪为中心两大类,前者包括问题管理应对和问题评估应对,后者包括回避型和非回避型情绪应对。用户、任务、环境等因素影响着大学生应对学术信息搜寻挫折的行为与效果。最后,指出进一步的研究问题,并提出相关对策。

关键词：学术信息搜寻挫折应对行为影响因素大学生

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A Class of m-Complex Symmetric Operators on Hardy Space

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Journal of Mathematical Research with Applications 2024年第1期44卷 63-80页

作者： Jia FU Xinmei li Ran li School of Mathematics Liaoning Normal University

In this paper,we study the necessary and sufficient condition that the Toeplitz operators with respect to the conjugations of one permutation are 2-complex ***,we introduce a class of conjugations called the conjugations of one permutations on the classical Hardy ***,Toeplitz operators are completely characterized as 2-complex symmetric structure under this class of *** matrix representation of Toeplitz operators in the classical regular orthogonal basis on Hardy space is used to describe this class of 2-complex symmetric Toeplitz ***,we add two preconditions fn=-f-nand fn=f-nrespectively to the Toeplitz operators,and we get more simplified *** the second condition,we study the 3-complex symmetry of Toeplitz operators,and we get the same result for Tfis a 3-CSO with the conjugation C((i,j)) and 2-CSO’s.

关键词： m-complex symmetric operator Toeplitz operator Hardy space

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“困境即使命”:构建中国-东盟-美国包容性地区秩序?

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国际经济合作 2024年第3期40卷 1-12,91页

作者：翟崑北京大学国际关系学院北京大学区域与国别研究院

突破近代以来西方主导的国际体系制约困境,实现共同的振兴与发展,是中国与东盟国家的共同使命。冷战结束以来,中国和东盟在突破困境的道路上实现长足发展,并致力于更高层级的中国-东盟命运共同体建设。当下,中国-东盟命运共同体发展面... 详细信息

突破近代以来西方主导的国际体系制约困境,实现共同的振兴与发展,是中国与东盟国家的共同使命。冷战结束以来,中国和东盟在突破困境的道路上实现长足发展,并致力于更高层级的中国-东盟命运共同体建设。当下,中国-东盟命运共同体发展面临新的系统性时代困境,包括全球性挑战突出、美国对华体系性战略竞争加剧、中国-东盟命运共同体仍需优化升级等诸多因素。在复杂竞合关系背景下,中国-东盟命运共同体突破这一困境的新使命,就是尝试构建中国-东盟—美国包容性地区秩序。

关键词：复杂竞合东南亚中国-东盟关系中美关系地区秩序 “全球南方”

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Disaster effects of climate change in High Mountain Asia:State of art and scientific challenges Disaster effects of climate change in High Mountain Asia:State of art and scientific challenges

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Advances in Climate Change Research 2024年第3期15卷 367-389页

作者： Hao WANG Bin-Bin WANG Peng CUI Yao-Ming MA Yan WANG Jian-Sheng HAO Yu WANG Ya-Mei li li-Jun SUN Jiao WANG Guo-Tao ZHANG Wei-Mo li Yu LEI Wen-Qing ZHAO Jin-Bo TANG Chao-Yue li Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China China‒Pakistan Joint Research Center on Earth Sciences Chinese Academy of SciencesIslamabad 45320Pakistan College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China College of Atmospheric Science Lanzhou UniversityLanzhou 730000China National Observation and Research Station for Qomolongma Special Atmospheric Processes and Environmental Changes Dingri 858200China

High Mountain Asia(HMA)shows a remarkable warming tendency and divergent trend of regional precipitation with enhanced meteorological *** rapid thawing of the HMA cryosphere may alter the magnitude and frequency of nature *** reviewed the influence of climate change on various types of nature hazards in HMA region,including their phenomena,mechanisms and *** reveals that:1)the occurrences of extreme rainfall,heavy snowfall,and drifting snow hazards are escalating;accelerated ice and snow melting have advanced the onset and increased the magnitude of snowmelt floods;2)due to elevating trigger factors,such as glacier debuttressing and the rapid shift of thermal and hydrological regime of bedrock/snow/ice interface or subsurface,the mass flow hazards including bedrock landslide,snow avalanche,ice-rock avalanches or glacier detachment,and debris flow will become more severe;3)increased active-layer detachment and retrogressive thaw slumps slope failures,thaw settlement and thermokarst lake will damage many important engineering structures and infrastructure in permafrost region;4)multi-hazards cascading hazard in HMA,such as the glacial lake outburst flood(GLOF)and avalanche-induced mass flow may greatly enlarge the destructive power of the primary hazard by amplifying its volume,mobility,and impact force;and 5)enhanced slope instability and sediment supply in the highland areas could impose remote catastrophic impacts upon lowland regions,and threat hydropower security and future water *** future,ongoing thawing of HMA will profoundly weaken the multiple-phase material of bedrock,ice,water,and soil,and enhance activities of nature *** and cascading hazards of high magnitude will prevail in *** the glacier runoff overpasses the peak water,low flow or droughts in lowland areas downstream of glacierized mountain regions will became more frequent and *** escalating hazards in the HMA region requires tackling s

关键词： High Mountain Asia Climate change Cryosphere degradation Nature hazards Disaster risk

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2-O-β-D-Glucopyranosyl-L-ascorbic acid,an ascorbic acid derivative isolated from the fruits of Lycium barbarum L.,ameliorates high fructose-induced neuroinflammation in mice:involvement of gut microbiota and leaky gut

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Food Science and Human Wellness 2024年第1期13卷 241-253页

作者： Wei Dong Yujia Peng Guijie Chen Zhiyong xie Weiqi Xu Wangting Zhou Jia Mi Lu Lu Yi Sun Xiaoxiong Zeng Youlong Cao Yamei Yan College of Food Science and Technology Nanjing Agricultural UniversityNanjing 210095China Institute of Wolfberry Engineering Technology National Wolfberry Engineering Research CenterNingxia Academy of Agriculture and Forestry SciencesYinchuan 750002China

Western diet(rich in highly refined sugar and fat)can induce a range of metabolic dysfunctions in animals and humans,including neuroinflammation and cognitive function *** and cognitive impairment,two critical pathological characteristics of Alzheimer’s disease,have been closely associated with microbial alteration via the gut-brain ***,the present study aimed to investigate the influence of 2-O-β-D-glucopyranosyl-L-ascorbic acid(AA-2βG)isolated from the fruits of Lycium barbarum on preventing the high-fructose diet(HFrD)induced neuroinflammation in *** was found that AA-2βG prevented HFr D-induced cognitive ***-2βG also predominantly enhanced the gut barrier integrity,decreased lipopolysaccharide entry into the circulation,which subsequently countered the activation of glial cells and neuroinflammatory *** beneficial effects were transmissible by horizontal fecal microbiome transplantation,transferring from AA-2βG fed mice to HFr D fed ***,AA-2βG exerted neuroprotective effects involving the enrichment of Lactobacillus and Akkermansia,potentially beneficial intestinal *** present study provided the evidence that AA-2βG could improve indices of cognition and neuroinflammmation via modulating gut dybiosis and preventing leaky *** a potential functional food ingredient,AA-2βG may be applied to attenuate neuroinflammation associated with Western-style diets.

关键词： Neuroinfl ammation Gut microbiota Leaky gut lipopolysaccharide Fecal microbiome transplantation 2-O-β-D-Glucopyranosyl-L-ascorbic acid

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High speed laser cladding as a new approach to prepare ultra-high temperature ceramic coatings

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Journal of Advanced Ceramics 2024年第2期13卷 143-154页

作者： Qiyao Deng Pengfei He Chuan Sun Yang li Yue Xing Yujie Wang Jinglong li Xiubing liang Xin Wang Yujie Zhou Yujun Cai National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die&Mould Tianjin University of Technology and EducationTianjin 300222China Defense Innovation Institute Academy of Military ScienceBeijing 100071China School of mechanical engineering Tianjin University of Technology and EducationTianjin 300222China Scientific and Technological Innovation Center Beijing 100012China

Ultra-high temperature ceramic(UHTC)coatings are used to protect the hot-end components of hypervelocity aerocrafts from thermal *** study provides a new approach to fabricate UHTC coatings with high speed laser cladding(HSLC)technology,and places more emphasis on investigating the formation mechanism,phase compositions,and mechanical properties of HSLC-UHTC *** show that a well-bonded interface between the coating and the tantalum alloy substrate can be *** coating is mainly composed of(Zr,Ta)C ceramic solid solution phase with a content of higher than 90% by volume and Ta(W)metal solid solution *** a relatively high powder feeding rate,the ZrC ceramic phase appears in the coating while a dense ZrC UHTC top layer with a thickness of up to~50μm is successfully *** for the mechanical properties of the HSLC coatings,the fracture toughness of the coating decreases with the increase of powder feeding *** increase of carbide solid solution phase can significantly improve the high temperature microhardness(552.7±1.8 HV0.5@1000℃).The innovative design of HSLC ZrC-based coatings on refractory alloys accomplishes continuous transitions on microstructure and properties from the substrate to the UHTC top layer,which is a very promising candidate scheme for thermal protection coating.

关键词： high speed laser cladding(HSLC) ultra-high temperature ceramic(UHTC) thermal protection coating microstructure mechanical properties

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91W-Ni-Fe-Co合金的常温、低温力学性能及微观组织

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中南大学学报（自然科学版） 2024年第8期55卷 3129-3141页

作者：成会朝石明君罗旭张广卫李昆刘彬中南大学粉末冶金国家重点实验室湖南长沙410083 西安华山钨制品有限公司陕西西安710043

通过粉末冶金方法制备91W-5.5Ni-3.3Fe-0.2Co和91W-5.5Ni-2.5Fe-1Co合金。采用硬度测试、室温低温拉伸试验、扫描电镜(SEM)和能谱(EDS)等方法,研究合金的微观组织演变和室温、低温力学行为。研究结果表明:在室温条件下,Co质量分数为1%... 详细信息

通过粉末冶金方法制备91W-5.5Ni-3.3Fe-0.2Co和91W-5.5Ni-2.5Fe-1Co合金。采用硬度测试、室温低温拉伸试验、扫描电镜(SEM)和能谱(EDS)等方法,研究合金的微观组织演变和室温、低温力学行为。研究结果表明:在室温条件下,Co质量分数为1%的合金的力学性能更优异,抗拉强度和伸长率分别为1 400 MPa和11.7%,拉伸断裂行为以钨解理断裂和黏结相撕裂为主。微观组织上,相比于低Co合金,高Co合金的晶粒更加细小,钨-钨连续度降低,黏结相体积分数提高,黏结相中钨溶解度增大,合金性能得到优化;随着温度降低,2种合金的强度提高,伸长率下降;在-60℃时,高Co合金的伸长率相比于低Co合金的伸长率提高了20%,同时,合金的断裂模式仍以韧性相撕裂为主,而低Co合金在低于-20℃时,断裂由钨解理断裂主导。在一定范围内,Co质量分数增加能抑制杂质元素在晶界处偏聚,提高钨晶粒塑性变形程度,降低低温脆性。

关键词：高密度钨合金钴力学性能断裂模式低温脆性

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