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蝉花的研究现状与分析

食品与发酵工业 2024年第1期50卷 341-350页

作者：周思静乔宇琛刘桂君陈伟王平宋梅芳王成涛北京市科学技术研究院辐射技术研究所北京100875 北京工商大学北京食品营养与人类健康高精尖创新中心北京100048 北京工商大学北京市食品添加剂工程技术研究中心北京100048

蝉花为我国食药用历史悠久的虫草类真菌之一,具有调节免疫力、抗肿瘤、改善肾功能等多种生理功效。该文综述了蝉花在物质成分、人工发酵培养技术、生物活性作用及组学等方面的研究进展,并对蝉花未来的发展前景进行展望,以期为蝉花的基... 详细信息

蝉花为我国食药用历史悠久的虫草类真菌之一,具有调节免疫力、抗肿瘤、改善肾功能等多种生理功效。该文综述了蝉花在物质成分、人工发酵培养技术、生物活性作用及组学等方面的研究进展,并对蝉花未来的发展前景进行展望,以期为蝉花的基础研究及在食品、药品和化妆品等方面的应用开发提供参考。

关键词：蝉花物质成分生物活性人工培养组学进展

Ferroptosis:a potential therapeutic target for stroke

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Neural Regeneration Research 2024年第5期19卷 988-997页

作者： Chengli liu guijun Wang Wenrui Han Qi Tian Mingchang Li Department of Neurosurgery Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

Ferroptosis is a form of regulated cell death characterized by massive iron accumulation and iron-dependent lipid peroxidation,differing from apoptosis,necroptosis,and autophagy in several *** is regarded as a critical mechanism of a series of pathophysiological reactions after stroke because of iron overload caused by hemoglobin degradation and iron metabolism *** this review,we discuss ferroptosis-related metabolisms,important molecules directly or indirectly targeting iron metabolism and lipid peroxidation,and transcriptional regulation of ferroptosis,revealing the role of ferroptosis in the progression of *** present updated progress in the intervention of ferroptosis as therapeutic strategies for stroke in vivo and in vitro and summarize the effects of ferroptosis inhibitors on *** review facilitates further understanding of ferroptosis pathogenesis in stroke,proposes new targets for the treatment of stroke,and suggests that more efforts should be made to investigate the mechanism of ferroptosis in stroke.

关键词： cell death ferroptosis oxidative stress stroke treatment

A fluorescent film sensor for high-performance detection of Listeria monocytogenes via vapor sampling

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聚集体(英文)

聚集体(英文) 2023年第1期4卷 165-172页

作者： Rongrong Huang Meiqi Li Dehui Lin Yangtao Shao Congdi Shang Qianqian liu guijun liu Nan Li Rong Miao Haonan Peng Yanli Tang Yu Fang Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education) School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’anChina Shaanxi Engineering Laboratory for Food Green Processing and Safety Control College of Food Engineering and Nutritional ScienceShaanxi Normal UniversityXi’anChina Department of Food Safety College of Food Science and EngineeringNorthwest A&F UniversityShaanxiChina

Foodborne Listeria monocytogenes poses serious threats to public *** and sensitive detection of the pathogen at the point of contamination is thus crucial to halt the spread of bacteria-related ***,we report for the first time a fluorescent film sensor to detect the biomarker of ***,*** sensor demonstrated unprecedented sensing performance for the analyte with a detection limit lower than 0.05 mg/m^(3),response time less than 1 s,full reversibility,and excellent *** study showed that the sensor can be used to monitor the growth of *** with much-improved *** superior performance of the sensor is ascribed to the specific binding,efficient charge transfer emission,and porous adlayer structure of the specially designed sensing fluorophore-based *** work paves the way to develop a portable detector to meet the needs for on-site and real-time detection of foodborne pathogens.

关键词： 3-hydroxy-2-butanone biomarkers fluorescent film sensors Listeria monocytogenes

NH_(4)Cl-assisted synthesis of TaON nanoparticle applied to photocatalytic hydrogen and oxygen evolution from water

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Journal of Energy Chemistry 2024年第7期94卷 541-550页

作者： Yao Xu Kaiwei liu Jifang Zhang Boyang Zhang Jiaming Zhang Ke Shi Haifeng Wang guijun Ma School of Physical Science and Technology Shanghaitech UniversityShanghai 201210China

Oxynitride semiconductors are promising photocatalyst materials for visible light-driven water splitting,while the synthesis of well crystalized oxynitride still remains *** present work,narrow-bandgap TaON nanoparticles are synthesized via heating a vacuum-sealed mixture of KTaO_(3),Ta and NH_(4)*** method possesses multiple advantages in terms of lower calcination parameter,higher N conversion efficiency and superior photocatalytic activity in comparison with the traditional thermal ammonolysis using NH_(3) gas as a nitrogen *** the analysis of intermediates produced upon the elevation of heating temperature,a gas-solid-phase reaction between TaCl_(5) and Ta_(2)O_(5) is demonstrated as the final step,which is conducive to decreasing thermal energy barrier and accelerating nitridation *** control of preparation conditions,including calcination temperature and duration,allows for the regulation of surface O/N ratio of TaON particles to unity,resulting in optimized photocat-alytic *** assessment and intensity modulated photocurrent spectroscopy provide convincing evidence for improved charge transfer effciency of photoexcited holes at TaON surface.A Z-scheme overall water splitting is accomplished by employing the TaON as an effective oxygen evolution photocatalyst,SrTiO_(3):Rh as a hydrogen evolution photocatalyst,and reduced graphene oxide(rGO)as a solid-state electron *** work presents a promising strategy for the synthesis of high-quality oxynitride materials in application to photocatalytic water splitting.

关键词： TaON Oxynitride synthesis Photocatalyst Water splitting,Hydrogen Z-scheme

The impact of COVID-19 on China’s regional economies and industries

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Journal of Geographical Sciences 2021年第4期31卷 565-583页

作者： WU Feng liu guijun GUO Naliang LI Zhihui DENG Xiangzheng Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China University of the Chinese Academy of Sciences Beijing 100049China

Scientifically assessing the economic impact of major public health emergencies,containing their negative effects,and enhancing the resilience of an economy are important national strategic *** new coronavirus disease(COVID-19)has,to date,been effectively contained in China,but the threat of imported cases and local risks still *** systematic identification of the virus’s path of influence and intensity is significant for economic *** study is based on a refined multi-regional general equilibrium analysis model,which measures the economic and industrial impacts at different epidemic risk levels in China and simulates development trends and the degree of damage to industries and the economy under changes to supplies of production materials and product *** results show that,at the macroeconomic level,China’s GDP will decline about 0.4%to 0.8%compared to normal in 2020,with an average drop of about 2%in short-term consumption,an average drop in employment of about 0.7%,and an average increase in prices of about 0.9%.At the industry level,the epidemic will have the greatest short-term impact on consumer and laborintensive *** example,the output value of the service industry will fall 6.3%compared to *** at the impact of the epidemic on the industrial system,the province most affected by the epidemic is Hubei,which is the only province in China in the level-1 risk *** the disease spread outward from Hubei,there were clear differences in the main industries that were impacted in different *** addition,simulation results of recovery intensity of regional economies under the two epidemic response scenarios of resumption of work and production and active fiscal stimulus policies show that an increase in fiscal stimulus policies produces a 0.3%higher rate of gross regional product growth but it causes commodity prices to rise by about 1.8%.Measures to resume work and production offer a wider scope for industria

关键词： COVID-19 economic system impact industrial impact zoning classification multi-region general equilibrium system resilience recovery strategy

流域尺度农业“水-土-经济”要素耦合机制与行为调控系统效应模拟

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农业资源与环境学报 2022年第3期39卷 631-642页

作者：刘桂君刘宇张倩吴锋中国科学院地理科学与资源研究所中国科学院陆地表层格局与模拟重点实验室北京100101 中国科学院大学北京100049 中国科学院科技战略咨询研究院北京100190 中国科学院大学公共政策与管理学院北京100049 中国农业大学土地科学与技术学院北京100193

农业系统的“水-土-经济”要素是刻画人类活动与生态-水文过程互馈效应耦合的关键界面之一。本研究以局部均衡理论为依据,基于栅格尺度的水、土、作物的空间分布数据与行政区尺度的粮食生产、消费与贸易数据嵌套,构建了行政区-栅格跨尺... 详细信息

农业系统的“水-土-经济”要素是刻画人类活动与生态-水文过程互馈效应耦合的关键界面之一。本研究以局部均衡理论为依据,基于栅格尺度的水、土、作物的空间分布数据与行政区尺度的粮食生产、消费与贸易数据嵌套,构建了行政区-栅格跨尺度的农业部门局部均衡分析“水-土-经济”要素耦合模型(Water-Land-Economicnexus Model,WLEM)。研究以黑河流域“粮改饲”补贴政策为例,模拟种植与加工环节的农机设备补贴下水土资源消耗强度与空间布局的变化,刻画农业“水-土-经济”要素的耦合机制与政策干预下行为调控的资源消耗及经济产出的系统效应。模拟发现,对种植环节的大型农机补贴增加了非水土自然要素的投入,降低了生产成本,有助于增加青贮玉米种植面积。而对加工环节进行农机补贴,可通过提高青贮技术直接影响青贮玉米作为饲料的投入,与种植环节补贴相比,其对青贮玉米产量的拉动作用较大。种植与加工环节叠加补贴在鼓励青贮玉米生产的同时,一定程度减少了籽粒玉米种植面积,符合“粮改饲”政策目标。结果表明,在政策补贴过程中需重视加工环节的农业机械设备补贴,并完善种植补贴和加工补贴两种政策的优势互补机制。从生产和加工两个环节补贴的空间效益来看,青贮玉米与籽粒玉米在畜牧业投入上的竞争关系使作物种植过程中水土资源要素投入呈现出空间异质性特征,这与栅格尺度上水土资源要素作为农产品成本的占比以及要素供给和替代弹性差异直接相关。该研究为制定合理的水土资源配置方案与农业发展政策,实现流域水-生态-经济协同发展提供了科学依据。

关键词： “水-土-经济”系统耦合黑河流域 “粮改饲”政策空间异质性农业部门局部均衡分析模型

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湍流热伴流中氢气与乙炔射流自着火实验

清华大学学报（自然科学版） 2023年第4期63卷 594-602页

作者：刘贵军刘佳悦张扬吴玉新清华大学能源与动力工程系热科学与动力工程教育部重点实验室北京100084 大连理工大学能源与动力学院大连116000

氢燃料燃气轮机是碳中和目标下氢燃料发电的关键设备,因此探究湍流热伴流中氢气自着火特征以及与碳氢燃料间的差异具有重要意义。该文采用湍流热伴流自着火实验系统,通过获取火焰图像和OH自由基分布,对比分析了氢气和乙炔在自着火类型... 详细信息

氢燃料燃气轮机是碳中和目标下氢燃料发电的关键设备,因此探究湍流热伴流中氢气自着火特征以及与碳氢燃料间的差异具有重要意义。该文采用湍流热伴流自着火实验系统,通过获取火焰图像和OH自由基分布,对比分析了氢气和乙炔在自着火类型、结构等方面的差异。结果表明:受氢气的高扩散系数和高火焰传播速度影响,氢气随机着火分布区域较紧凑,OH自由基分布较连续,同时难以观测到独立自着火核。此外,相较于乙炔,氢气自着火抬升高度对燃料射流速度敏感性较低,自着火位置波动性较弱。基于氢气射流自着火特征,该文还改进了自着火抬升高度预测模型,并证明了火焰传播在氢气射流自着火火焰稳定方面的重要作用。

关键词：燃气轮机氢气自着火射流火焰抬升高度

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农业面源污染管理政策调控仿真模型研究进展

生态学报 2022年第8期42卷 3045-3055页

作者：吴锋曾麟岚刘桂君中国科学院地理科学与资源研究所中国科学院陆地表层格局与模拟重点实验室北京100101 中国科学院大学北京100049

农业面源污染因其分散性、滞后性和不确定性而成为环境治理的难点。面源污染物迁移转化过程的模拟模型发展迅速,而农业面源污染管理政策仿真评估模型研究相对较为滞后。系统梳理与分析了自上而下宏观目标约束、自下而上微观行为传导及... 详细信息

农业面源污染因其分散性、滞后性和不确定性而成为环境治理的难点。面源污染物迁移转化过程的模拟模型发展迅速,而农业面源污染管理政策仿真评估模型研究相对较为滞后。系统梳理与分析了自上而下宏观目标约束、自下而上微观行为传导及宏观与微观上下耦合三类政策仿真模型研究进展,总结了当前模型的基础理论与方法的优势与不足。本文提出了融合流域水系统过程规律认知,构建宏观政策目标自上而下约束与微观主体行为自下而上传导耦合的农业面源污染政策仿真模型,实现政策仿真模拟在国家、区域、流域与栅格跨尺度上的嵌套传导、参数互验与系统预测,以解决因农业面源污染防治主体的多元性与防治对象的广泛性特征所导致的复杂性系统难题,使得政策效应模拟仿真结果空间显性化,进而实现农业面源污染控制的政策管理由粗放型向精准化方向迈进。

关键词：面源污染政策模拟耦合模型行为调控

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基于分子钳化合物的手性识别研究进展

有机化学 2016年第11期36卷 2583-2601页

作者：刘贵君石浩浙江工业大学药学院杭州310014

手性是自然界中广泛存在的现象,设计合成新型人工受体模拟生物体内的分子识别已经成为生物有机化学和超分子化学等领域富于挑战性的课题之一.分子钳类人工受体结构易于修饰,在手性识别和检测中具有广泛的应用前景,本文对近年来合成的分... 详细信息

手性是自然界中广泛存在的现象,设计合成新型人工受体模拟生物体内的分子识别已经成为生物有机化学和超分子化学等领域富于挑战性的课题之一.分子钳类人工受体结构易于修饰,在手性识别和检测中具有广泛的应用前景,本文对近年来合成的分子钳人工受体以及应用光谱、色谱和质谱等检测手段对其手性识别性能的研究进行了总结,并对分子钳人工受体的发展前景作出了展望.

关键词：分子钳人工受体手性识别光谱色谱质谱