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Interface sites on vanadia-based catalysts are highly active for NO_(x) removal under realistic conditions

Journal of Environmental Sciences 2024年第2期136卷 523-536页

作者： Zhihui Lv Guangzhi he Wenshuo Zhang Jingjing Liu Zhihua Lian yang yang Zidi yan Guangyan Xu Wenpo Shan Yunbo Yu Hong he State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Ningbo Research Center for Urban Environment Chinese Academy of SciencesNingbo 315800China

TiO_(2)-supported V_(2)O_(5)catalysts are commonly used in NO_(x)reduction with ammonia due to their robust catalytic *** these catalysts,it is generally considered that the active species are mainly derived from the vanadia species rather than the intrinsic structure of V-O-Ti entities,namely the interface *** reveal the role of V-O-Ti entities in NH_(3)-SCR,herein,we prepared TiO_(2)/V_(2)O_(5)catalysts and demonstrated that V-O-Ti entities were more active for NO_(x)reduction under wet conditions than the V sites(V=O)working *** the V-O-Ti entities,kinetic measurements and first principles calculations revealed that NH_(3)activation exhibited a much lower energy barrier than that on V=O *** wet conditions,the V-O-Ti interface significantly inhibited the transformation of V=O to V-OH sites thus benefiting NH_(3)*** wet conditions,meanwhile,the migration of NH_(4)^(+)from Ti site neighboring the V-O-Ti interface to Ti site of the V-O-Ti interface was exothermic;thus,V-O-Ti entities together with neighboring Ti sites could serve as channels linking NH_(3)pool and active centers for activation of NH_(4)^(+).This finding reveals that the V-O-Ti interface sites on V-based catalysts play a crucial role in NO_(x)removal under realistic conditions,providing a new perspective on NH_(3)-SCR mechanism.

关键词： NO_(x)removal Vanadia-based catalysts V-O-Ti entities Interface sites Reaction mechanism

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Glasesterterpenoids A-C:three sesterterpenoids with 7-cyclohexyl-decahydronaphthalene carbon skeleton isolated from the root of Lindera glauca

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Chinese Journal of Natural Medicines 2024年第9期22卷 864-868页

作者： he Shiting ZOU Qinghui ZHANG Qi LUO Yingming yan Die he Jingxin LIU Yena CUI Hui School of Pharmaceutical Sciences Guangzhou University of Chinese MedicineGuangzhou 510006China State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer MedicineSun Yat-Sen University Cancer CenterGuangzhou 510060China

Three novel sesterterpenoids glasesterterpenoids A-C(1-3),featuring an unprecedented 7-cyclohexyldecahydronaphthalene carbon skeleton,were isolated from the root of Lindera glauca(***).Their structures were elucidated by quantum chemical calculations and spectroscopic *** biogenetic pathway for 1-3 is *** the bioassay,glasesterterpenoid C exhibited DNA topoisomerase 1(Top1)inhibitory activity compared with the positive control,*** findings represent the first examples of sesterterpenoids with a 7-cyclohexyldecahydronaphthalene carbon skeleton from the root of ***.

关键词： Sesterterpenoids Lindera glauca

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浆体输送管道的管径优化设计

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交通运输工程学报 2005年第2期5卷 61-64页

作者：李晓何炎平谭家华上海交通大学船舶海洋与建筑工程学院上海200230

分析了浆体的物理特性和输送装置特性,应用非线性优化方法,在已知泵的配置、输送浓度与管材的条件下,以输送每立方米土所用费用单价的最小值作为目标函数,以浆体的悬浮性和整个浆体输送系统的工作点等作为主要约束条件,建立了浆体输送... 详细信息

分析了浆体的物理特性和输送装置特性,应用非线性优化方法,在已知泵的配置、输送浓度与管材的条件下,以输送每立方米土所用费用单价的最小值作为目标函数,以浆体的悬浮性和整个浆体输送系统的工作点等作为主要约束条件,建立了浆体输送管道的管径优化数学模型。费用单价为年费用与年输送量的比率,年费用着重考虑了与管道直径密切相关的管道材料年折算费用和年泵站运行费用。数值计算得到的最优管径为0.8957m,管内流量为3.134m3/s,管道的最终厚度为2.6×10-3m。与多方案优选法管径计算结果0.9m相比,所述方法的计算结果准确,计算量小。

关键词：管道运输管径设计非线性优化浆体输送

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我国城市家庭体育教育的阶层分化——以上海城市居民为例

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北京体育大学学报 2016年第12期39卷 88-92,98页

作者：王燕何平香江西师范大学体育学院江西南昌330022 上海体育学院国际教育学院上海200438

为了解现阶段我国家庭教育模式的转换,以及参与家庭体育教育群体的社会阶层结构,采用问卷调查和数理分析的研究方法,通过选取上海城市居民家庭体育教育投入和家庭体育教育理念这2个独特的研究视角来观察我国正处于成型过程中的社会阶层... 详细信息

为了解现阶段我国家庭教育模式的转换,以及参与家庭体育教育群体的社会阶层结构,采用问卷调查和数理分析的研究方法,通过选取上海城市居民家庭体育教育投入和家庭体育教育理念这2个独特的研究视角来观察我国正处于成型过程中的社会阶层结构,为我国家庭体育教育的发展提供思路。研究发现我国的体育教育分层在城市家庭中正在悄悄发生。中国传统社会形成的惯例是通过文化教育的投入来实现其低阶层向高阶层的跃进,而我国当前社会所发生的城市家庭教育事实却在此基础上有了新的发展。家庭体育教育的投入逐渐为越来越多的城市家庭所重视,并且在家庭教育投入上,中上阶层比社会底层的家庭更愿意选择高级别的体育活动和体育培训;在家庭体育教育理念上,中上阶层的家庭更愿意选择体育的协作手段来促进子女的社会化和引导子女高尚的行为方式。

关键词：城市家庭体育体育教育阶层分化社会结构社会阶层

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Cadherin-18 loss in prospermatogonia and spermatogonial stem cells enhances cell adhesion through a compensatory mechanism

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Zoological Research 2024年第5期45卷 1048-1060页

作者： Xiao-Xiao Li Dan-Chen Zhang yan Wang Jian Wen Xing-Ju Wang Yu-Lu Cao Ru Jiang Jia-Rui Li Yi-Nuo Li he-he Liu Wen-Hai Xie Zheng-Feng Xu ping Hu Kang Zou Germline Stem Cells and Microenvironment Lab College of Animal Science and TechnologyNanjing Agricultural UniversityNanjingJiangsu 210095China Stem Cell Research and Translation Center Nanjing Agricultural UniversityNanjingJiangsu 210095China School of Life Sciences and Medicine Shandong University of TechnologyZiboShandong 255000China Department of Prenatal Diagnosis Women’s Hospital of Nanjing Medical UniversityNanjing Maternity and Child Health Care HospitalNanjingJiangsu 210004China

Extracellular membrane proteins are crucial for mediating cell attachment,recognition,and signal transduction in the testicular microenvironment,particularly germline stem *** 18(CDH18),a type Ⅱ classical cadherin,is primarily expressed in the nervous and reproductive ***,we investigated the expression of CDH18in neonatal porcine prospermatogonia(ProSGs)and murine spermatogonial stem cells(SSCs).Disruption of CDH18 expression did not adversely affect cell morphology,proliferation,self-renewal,or differentiation in cultured porcine ProSGs,but enhanced cell adhesion and prolonged cell *** analysis indicated that the down-regulation of CDH18 in ProSGs significantly up-regulated genes and signaling pathways associated with cell *** further elucidate the function of CDH18 in germ cells,Cdh18 knockout mice were generated,which exhibited normal testicular morphology,histology,*** analysis showed increased expression of genes associated with adhesion,consistent with the observations in porcine *** interaction of CDH18withβ-catenin and JAK2 in both porcine ProSGs and murine SSCs suggested an inhibitory effect on the canonical Wnt and JAK-STAT signaling pathways during CDH18 ***,these findings highlight the crucial role of CDH18 in regulating cell adhesion in porcine ProSGs and mouse *** this regulatory mechanism provides significant insights into the testicular niche.

关键词： Extracellular signal Fertility Quiescency Wnt signaling pathway

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Multiomics analyses of two Leonurus species illuminate leonurine biosynthesis and its evolution

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Molecular Plant 2024年第1期17卷 158-177页

作者： Peng Li Meng-Xiao yan Pan Liu Dan-Jie yang Ze-Kun he Yun Gao yan Jiang Yu Kong Xin Zhong Sheng Wu Jun yang Hong-Xia Wang yan-Bo Huang Le Wang Xiao-Ya Chen Yong-Hong Hu Qing Zhao ping Xu shanghai Key Laboratory of Plant Functional Genomics and Resources Shanghai Chenshan Botanical GardenShanghai Chenshan Plant Science Research CenterChineseAcademy of SciencesShanghaiChina College of Life Sciences Shanghai Normal UniversityShanghai 200234China State Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesShanghaiChina University of the Chinese Academy of Sciences Beijing 100049China The Research Center of Chiral Drugs Innovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese Medicine1200 Cailun RoadShanghai 201203China College of Chemistry and Chemical Engineering Shanghai University of Engineering ScienceShanghai 201620China

The Lamiaceae family is renowned for its terpenoid-based medicinal components,but Leonurus,which has traditional medicinal uses,stands out for its alkaloid-rich ***,the principal active compound found in Leonurus,has demonstrated promising effects in reducing blood lipids and treating ***,the biosynthetic pathway of leonurine remains largely ***,we present the chromosome-level genome sequence assemblies of Leonurus japonicus,known for its high leonurine production,and Leonurus sibiricus,characterized by very limited leonurine *** integrating genomics,RNA sequencing,metabolomics,and enzyme activity assay data,we constructed the leonurine biosynthesis pathway and identified the arginine decarboxylase(ADC),uridine diphosphate glucosyltransferase(UGT),and serine carboxypeptidase-like(SCPL)acyltransferase enzymes that catalyze key reactions in this *** analyses revealed that the UGT–SCPL gene cluster evolved by gene duplication in the ancestor of Leonurus and neofunctionalization of SCPL in ***,which contributed to the accumulation of leonurine specifically in ***,our comprehensive study illuminates leonurine biosynthesis and its evolution in Leonurus.

关键词： Lamiaceae Leonurus japonicus Leonurus sibiricus genome sequence alkaloids leonurine gene cluster biosynthetic pathway evolution

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Metabolic engineering of an industrial bacterium Zymomonas mobilis for anaerobic l-serine production

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Synthetic and Systems Biotechnology 2024年第2期9卷 349-358页

作者： Zhen Wang Xia Wang Xiongying yan Haixia Yi Shuche he Haoyu Zhang Xinli Zhou Qiaoning he Shihui yang State Key Laboratory of Biocatalysis and Enzyme Engineering and School of Life Sciences Hubei UniversityWuhan430062China

Due to the complicated metabolic and regulatory networks of l-serine biosynthesis and degradation,microbial cell factories for l-serine production using non-model microorganisms have not been *** this study,a combination of synthetic biology and process optimization were applied in an ethanologenic bacterium Zymomonas mobilis for l-serine *** blocking the degradation pathway while introducing an exporter EceamA from ***,l-serine titer in recombinant *** was increased from 15.30 mg/L to 62.67 mg/*** was further increased to 260.33 mg/L after enhancing the l-serine biosynthesis ***,536.70 mg/L l-serine was achieved by removing feedback inhibition with a SerA mutant,and an elevated titer of 687.67 mg/L was further obtained through increasing serB copies while enhancing the ***,855.66 mg/L l-serine can be accumulated with the supplementation of the glutamate *** work thus not only constructed an l-serine producer to help understand the bottlenecks limiting l-serine production in *** for further improvement,but also provides guidance on engineering non-model microbes to produce biochemicals with complicated pathways such as amino acids or terpenoids.

关键词： Zymomonas mobilis Metabolic engineering l-serine Feedback inhibition Anaerobic fermentation

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Functional aspects of the brain lymphatic drainage system in aging and neurodegenerative diseases

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Journal of Biomedical Research 2024年第3期38卷 206-221页

作者： yan Chen Xiaoxin he Jiachen Cai Qian Li Jiangsu Key Laboratory of Neurodegeneration Nanjing Medical UniversityNanjingJiangsu 211166China Shandong Institute of Brain Science and Brain-inspired Research Shandong First Medical University&Shandong Academy of Medical SciencesJinanShandong 250117China Center for Global health Nanjing Medical UniversityNanjingJiangsu 211166China

The phenomenon of an aging population is advancing at a precipitous ***'s disease(AD)and Parkinson's disease(PD)are two of the most common age-associated neurodegenerative diseases,both of which are primarily characterized by the accumulation of toxic proteins and the progressive demise of neuronal *** discoveries about the brain lymphatic drainage system have precipitated a growing body of investigations substantiating its novel roles,including the clearance of macromolecular waste and the trafficking of immune ***,aquaporin 4-mediated glymphatic transport,crucial for maintaining neural homeostasis,becomes disrupted during the aging process and is further compromised in the pathogenesis of AD and *** meningeal lymphatic vessels,which facilitate the drainage of cerebrospinal fluid into the deep cervical lymph nodes,are integral in bridging the central nervous system with peripheral immune *** in these meningeal lymphatic vessels exacerbates pathological trajectory of the age-related neurodegenerative *** review explores modulatory influence of the glymphatic system and meningeal lymphatic vessels on the aging brain and its associated neurodegenerative *** also encapsulates the insights of potential mechanisms and prospects of the targeted non-pharmacological interventions.

关键词： glymphatic system meningeal lymphatic vessels aging neurodegenerative diseases nonpharmacological therapies

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Experimental and numerical study on atmospheric-pressure air dielectric barrier discharge via 50 Hz/5000 Hz dual-frequency excitation

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High Voltage 2024年第2期9卷 391-402页

作者： Junwen he Bangfa Peng Guanglin Yu Ronggang Wang Nan Jiang Jie Li yan Wu School of Electrical Engineering Dalian University of TechnologyDalianChina Canmax Technologies Co. Ltd.SuzhouChina

A dual-frequency(DF)dielectric barrier discharge,excited by the superposition of a 50 Hz low frequency(LF)and a 5000 Hz intermediate frequency(IF),is proposed to enhance *** effect of the LF voltage component on the breakdown behaviour of the DF discharge during different periods has been studied both experimentally and *** number of high-current pulses rises as the LF voltage *** statistical analysis shows that the number of the current pulse amplitude above 80 mA in the DF discharge reaches nearly 6 times that in the IF ***,the total discharge energy in the DF discharge is significantly higher than that in the IF *** simulation re-produces the temporal variation of the breakdown behaviours in the DF *** simulated results reveal that the maximal electric field strength of the breakdown process is greater in the DF discharge compared to the IF discharge during a half-period of ***,the comparison between the IF and DF discharges exhibits that the LF voltage regulates the accumulation of residual charged species on the dielectric surface after the breakdown by modulating the residual voltage between the air gap.

关键词： dielectric excitation excited

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Prediction of solar activities:Sunspot numbers and solar magnetic synoptic maps

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Science China Earth Sciences 2024年第8期67卷 2460-2477页

作者： Rui ZHUO Jiansen he Die DUAN Rong LIN Ziqi WU Limei yan Yong WEI School of Earth and Space Sciences Peking UniversityBeijing 100091China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Centre for Mathematical Plasma Astrophysics Department of MathematicsKU LeuvenLeuven 3001Belgium Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

The evolution of solar magnetic fields is significant for understanding and predicting solar *** our knowledge of solar magnetic fields largely depends on the photospheric magnetic *** this paper,based on the spherical harmonic expansion of the photospheric magnetic field observed by Wilcox Solar Observatory,we analyze the time series of spherical harmonic coefficients and predict Sunspot Number as well as synoptic maps for Solar Cycle *** find that solar maximum years have complex short-period disturbances,and the time series of coefficient g_(7)~0 is nearly in-phase with Sunspot Number,which may be related to solar meridional *** Long Short-Term Memory networks(LSTM),our prediction suggests that the maximum of Solar Cycle 25 is likely to occur in June 2024 with an error of 8 months,the peak sunspot number may be 166.9±22.6,and the next solar minimum may occur around January *** incorporating Empirical Mode Decomposition,we enhance our forecast of synoptic maps truncated to Order 5,validating their relative *** prediction not only addresses a gap in forecasting the global distribution of the solar magnetic field but also holds potential reference value for forthcoming solar observation plans.

关键词： Solar activity prediction Solar magnetic field Spherical harmonic expansion Long-Short Term Memory(LSTM) Empirical Mode Decomposition(EMD)

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