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Journal of Environmental Sciences 2024年第7期141卷 194-204页

作者： Tingting Xie liming cao Jinyi Zheng Peng Xuan Xiaofeng Huang Laboratory of Atmospheric Observation Supersite School of Environment and EnergyPeking University Shenzhen Graduate SchoolShenzhen 518055China

Effective density(ρ_(eff))is one of the most important physical properties of atmospheric particles,providing important references in exploring the emissions and aging processes of fresh *** this study,a combined system of differential mobility analyzer,centrifugal particle mass analyzer,and condensation particle counter was used to periodically measure theρ_(eff)of atmospheric particles in Shenzhen from Oct.2021 to *** showed that theρ_(eff)of particles with various size presented a bimodal distribution,which could be divided into main density(ρ_(m),main peak,corresponding to relatively dense particles after aging)and sub density(ρ_(s),sub peak,corresponding to fresh particles).The occurrence frequencies ofρ_(s)of particles with diameters of 50 and 80 nm were less than 20%,but were as high as about 40%of that with diameters from 120 to 350 ***ρ_(m)showed increasing trend with the size of particles,whileρ_(s)decreased as the increasing of the size of ***ρ_(eff)on pollution day varied significantly with chemical *** increasing of the proportion of sulfate could promote the increasing ofρ_(eff),while black carbon and organic matter caused opposite effects,which may be related to various factors,including the difference of the material density and morphology of various chemical ***ρ_(eff)of 50,80 and 120 nm particles decreased considerably during the new particle formation event,indicating that organic condensation was an important contributor to new particle growth.

关键词： DMA-CPMA-CPC Effective density Main/sub density Size distribution

Development of an on-line measurement system for water-soluble organic matter in PM_(2.5) and its application in China

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Journal of Environmental Sciences 2018年第7期30卷 33-40页

作者： Huiying Li Xiaofeng Huang liming cao Yuhong Zhai Liwu Zeng Lingyan He Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School

Water-soluble organic matter（WSOM） represents a critical fraction of fine particles（PM2.5）in the air, but its changing behaviors and formation mechanisms are not well understood yet, partly due to the lack of fast techniques for the ambient measurements. In this study,a novel system for the on-line measurement of water-soluble components in PM2.5, the particle-into-liquid sampler（PILS）–Nebulizer–aerosol chemical speciation monitor（ACSM）, was developed by combining a PILS, a nebulizer, and an ACSM. High time resolution concentrations of WSOM, sulfate, nitrate, ammonium, and chloride, as well as mass spectra, can be obtained with satisfied quality control results. The system was firstly applied in China for field measurement of WSOM. The mass spectrum of WSOM was found to resemble that of oxygenated organic aerosol, and WSOM agreed well with secondary inorganic ions. All evidence collected in the field campaign demonstrated that WSOM could be a good surrogate of secondary organic aerosol（SOA）. The PILS–Nebulizer–ACSM system can thus be a useful tool for intensive study of WSOM and SOA in PM2.5.

关键词： PM2.5 Water-soluble organic matter Secondary organic matter On-line measurement Mass spectrum

Chemical characterization and source apportionment of atmospheric submicron particles on the western coast of Taiwan Strait, China

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Journal of Environmental Sciences 2017年第2期29卷 293-304页

作者： liming cao Qiao Zhu Xiaofeng Huang Junjun Deng Jinsheng Chen Youwei Hong Lingling Xu Lingyan He Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School Center for Excellence in Urban Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences

Taiwan Strait is a special channel for subtropical East Asian Monsoon and its western coast is an important economic zone in China. In this study, a suburban site in the city of Xiamen on the western coast of Taiwan Strait was selected for fine aerosol study to improve the understanding of air pollution sources in this region. An Aerodyne high-resolution time-of-flight aerosol mass spectrometer（HR-To F-AMS） and an Aethalometer were deployed to measure fine aerosol composition with a time resolution of 5 min from May 1to 18, 2015. The average mass concentration of PM1 was 46.2 ± 26.3 μg/m^3 for the entire campaign. Organics（28.3%）, sulfate（24.9%）, and nitrate（20.6%） were the major components in the fine particles, followed by ammonium, black carbon（BC）, and chloride. Evolution of nitrate concentration and size distribution indicated that local NOx emissions played a key role in high fine particle pollution in Xiamen. In addition, organic nitrate was found to account for 9.0%–13.8% of the total measured nitrate. Positive Matrix Factorization（PMF）conducted with high-resolution organic mass spectra dataset differentiated the organic aerosol into three components, including a hydrocarbon-like organic aerosol（HOA） and two oxygenated organic aerosols（SV-OOA and LV-OOA）, which on average accounted for 27.6%,28.8%, and 43.6% of the total organic mass, respectively. The relationship between the mass concentration of submicron particle species and wind further confirmed that all major fine particle species were influenced by both strong local emissions in the southeastern area of Xiamen and regional transport through the Taiwan Strait.

关键词： Submicron particle Chemical characterization Organic aerosol Source apportionment

OstMAPKKK5, a truncated mitogen-activated protein kinase kinase kinase 5, positively regulates plant height and yield in rice

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The Crop Journal 2019年第5期7卷 707-714页

作者： Yahui Liu Yu Zhu Xuding Xu Fan Sun Jingshui Yang liming cao Xiaojin Luo State Key Laboratory of Genetic Engineering Institute of GeneticsSchool of Life SciencesFudan UniversityShanghai 200438China Institute of Crop Breeding and Cultivation Shanghai Academy of Agricultural SciencesShanghai 201403China Engineering Research Center of Gene Technology Ministry of EducationFudan UniversityShanghai 200438China

Rice(Oryza sativa L.)is a major food crop *** height and yield are important agronomic traits of *** genes regulating plant height and/or yield have been ***,the molecular mechanisms coordinating plant height and yield are not fully ***,we report a novel gene,OstMAPKKK5 that encodes a truncated variant of a mitogen-activated protein kinase kinase kinase 5(OsMAPKKK5)lacking an intact kinase *** plants overexpressing OstMAPKKK5 in indica cultivar 9311 showed increased plant height,grain length,grain width,1000-grain weight,grain number per main panicle,and ***-time quantitative PCR showed that OstMAPKKK5 was widely expressed in various tissues and developmental *** increased plant height and yield were attributed to enlarged cell *** of OstMAPKKK5 led to higher contents of various forms of endogenous gibberellin(GA),especially the most common active forms,GA1,GA3,*** concluded that OstMAPKKK5 positively regulates plant height and yield in rice by affecting cell size,and that its underlying mechanism is based on increased endogenous GA content.

关键词： OstMAPKKK5 Plant height and yield Cell size Gibberellin Oryza sativa

Computational fluid dynamics simulation and experimental study on mixing performance of a three-dimensional circular cyclone-type microreactor

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Chinese Chemical Letters 2024年第4期35卷 382-388页

作者： Shiyu Hou Maolin Sun liming cao Chaoming Liang Jiaxin Yang Xinggui Zhou Jinxing Ye Ruihua Cheng School of Chemical Engineering East China University of Science and TechnologyShanghai 200237China School of Biomedical and Pharmaceutical Sciences Guangdong University of TechnologyGuangzhou 510006China School of Pharmacy East China University of Science and TechnologyShanghai 200237China

Microchannels enable the fast and efficient mixing of multiphase *** this study, a millimeter-scale three-dimensional(3D) circular cyclone-type microreactor was designed for the *** flow characteristics and mixing intensity were simulated by computational fluid dynamics simulations at a flow rate range of 12–96 m L/min using a water/ethyl acetate *** the 3D variable-diameter structure,the microreactor induced paired opposite vortices and abruptly changed the local pressure to achieve a stable turbulent effect within the theoretical range of laminar *** injection simulations indicated that sufficient mixing units successfully promote fluid ***-coupling experiments showed a segregation index of X_S= 0.00,039 within a residence time of 9 *** experiments on the nbutanol/succinic acid/water system showed that the 3D circular cyclone-type microreactor achieved 100%extraction efficiency(E) in 4.25 s, and the overall volume mass transfer coefficient(K_La) reached 0.05–1.5s^(-1) in 12–96 m L/*** isolated yield of the phase transfer alkylation and oxidation reactions in the 3D circular cyclone-type microreactor achieved 99% within 36 s, which was superior to the coil microreactor and batch reactor.

关键词： Microfluidics Passive microreactor CFD simulation Extraction Liquid-liquid biphase reaction

Characterization of particle number size distribution and new particle formation in Southern China

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Journal of Environmental Sciences 2017年第1期29卷 342-351页

作者： Xiaofeng Huang Chuan Wang Jianfei Peng Lingyan He liming cao Qiao Zhu Jie Cui Zhijun Wu Min Hu Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and EnergyPeking University Shenzhen Graduate SchoolShenzhen 518055China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China

Knowledge of particle number size distribution（PND） and new particle formation（NPF）events in Southern China is essential for mitigation strategies related to submicron particles and their effects on regional air quality,haze,and human *** this study,seven field measurement campaigns were conducted from December 2013 to May 2015 using a scanning mobility particle sizer（SMPS） at four sites in Southern China,including three urban sites and one background *** were measured in the size range of15-515 nm,and the median particle number concentrations（PNCs） were found to vary in the range of 0.3× 10~4-2.2 × 10~4 cn^（-3） at the urban sites and were approximately 0.2 × 10~4 cm^（-3） at the background *** peak diameters at the different sites varied largely from 22 to 102 *** PNCs in the Aitken mode（25-100 nm） at the urban sites were up to 10 times higher than they were at the background site,indicating large primary emissions from traffic at the urban *** diurnal variations of PNCs were significantly influenced by both rush hour traffic at the urban sites and NPF *** frequencies of NPF events at the different sites were0%-30%,with the highest frequency occurring at an urban site during *** higher SO_2 concentrations and higher ambient temperatures being necessary,NPF at the urban site was found to be more influenced by atmospheric oxidizing capability,while NPF at the background site was limited by the condensation *** study provides a unique dataset of particle number and size information in various environments in Southern China,which can help understand the sources,formation,and the climate forcing of aerosols in this quickly developing region,as well as help constrain and validate NPF modeling.

关键词： Scanning mobility particle sizer(SMPS) Particle number size distribution(PND) New particle formation(NPF) Air pollution Southern China

Solid-state molecular dynamics of a torsion-variable ammonium embedded in a deformable supramolecular framework

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Chinese Journal of Structural Chemistry 2023年第2期42卷 23-28页

作者： Hui Xiao Liwen Ding Jingyan Liu Zhihui Jia liming cao Ziyi Du Chunting He College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China College of Chemistry Fuzhou UniversityFuzhou350108China

Accompanied by solid-state structural phase transitions,the switchable molecular dynamics(MD)and order-disorder transformation of(i-PrNHMe2)^(+)cation embedded in a deformable{[Ni(NCS)_(6)]^(4-)}_(∞)supramolecular framework are in-depth investigated by variable-temperature tests of single-crystal X-ray diffraction,dielectric measurement,and MD ***,it is found that the confined swinging or flipping of the(i-PrNHMe_(2))^(+)cation as a whole is assisted by a synergistic change of its torsion *** research provides a helpful insight into the solid-state MD of moderate-sized quasi-spherical molecules/ions that feature a flexible inner core.

关键词： Solid-state molecular dynamics Supramolecular framework Phase transition Dielectric

Bronchial Fistula: Rare Complication of Treatment with Anlotinib

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中国肺癌杂志 2020年第10期23卷 858-865页

作者： Pengbo DENG Chengping HU Yuanyuan LI liming cao Huaping YANG Min LI Jian AN Juan JIANG Qihua GU Department of Respiratory Medicine Xiangya Lung Cancer Center Xiangya HospitalCentral South UniversityChangsha 410008China

Background and objective Anlotinib is a newly developed small molecule multiple receptor tyrosine kinase(RTK) inhibitor that was approved for the treatment of patients with lung cancer in China. We aim to report 3 cases of rare complication of anlotinib-bronchial fistula(BF) during the treatment of lung cancer patients and summarize the possible *** We collected three patients who developed BF due to anlotinib treatment, and conducted a search of Medline and Pub Med for medical literature published between 2018 and 2020 using the following search terms: "anlotinib," "lung cancer," and "fistula."Results Our literature search produced two case reports(three patients) which, in addition to our three patients. We collated the patients’ clinical characteristics including demographic information, cancer type, imaging features, treatment received, risk factors for anlotinib related BF, and treatment-related outcomes. The six patients shared some common characteristics: advanced age, male, concurrent infection symptoms, diabetes mellitus(DM), advanced squamous cell and small cell lung cancers, centrally located tumors, tumor measuring ≥5 cm in longest diameter, and newly formed tumor cavitation after multi-line treatment especially after receiving radiotherapy. Fistula types included broncho-pericardial fistula, broncho-pleural fistula, and esophagotracheobronchial fistula. Six patients all died within 6 *** Although anlotinib is relatively safe, it is still necessary to pay attention to the occurrence of BF, a rare treatment side effect that threatens the quality of life and overall survival of patients. Anlotinib, therefore, requires selective use and close observation of high-risk patients.

关键词： lung cancer fistula

A sequential continuous flow synthesis and purification process of calcium dibutyryladenosine cyclophosphate

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Chinese Chemical Letters 2024年第2期35卷 402-406页

作者： liming cao Maolin Sun Chaoming Liang Lei Yang Yueyue Ma Ruihua Cheng Yanxiong Ke Wei Yu Jinxing Ye Engineering Research Center of Pharmaceutical Process Chemistry Ministry of EducationSchool of PharmacyEast China University of Science and TechnologyShanghai 200237China School of Biomedical and Pharmaceutical Sciences Guangdong University of TechnologyGuangzhou 510006China Shanghai No.1 Biochemical& Pharmaceutical Co. Ltd.Shanghai 200080China

Calcium dibutyryladenosine cyclophosphate is a widely used cardiovascular *** traditional batch synthesis process suffers from long reaction times,tedious operations,and unstable ***,a sequential continuous flow synthesis combined with a multistage in-line purification process of calcium dibutyryladenosine cyclophosphate was *** acylation reaction was completed in a continuous coil reactor at 160℃ in 20 *** the high toxic solvent pyridine was replaced by ***,the multistage in-line purification process was integrated into the homemade 3D circular cyclone-type micromixer *** with the membrane phase separators,the residence time of the purification step was 30 *** isolated yield of this sequential continuous process was 92%with 99%purity.

关键词： Flow chemistry Calcium dibutyryladenosine cyclophosphate Continuous flow synthesis In-line purification 3D circular cyclone-type micromixer chip

A New PCR/LDR-Based Multiplex Functional Molecular Marker for Marker-Assisted Breeding in Rice

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Rice science 2021年第1期28卷 6-10页

作者： Chu Huangwei Tu Rongjian Niu Fuan Zhou Jihua Sun Bin Luo Zhongyong Cheng Can cao liming Institute of Crop Breeding and Cultivation Shanghai Academy of Agricultural SciencesShanghai 201403China

Marker-assisted selection or marker-aided selection(MAS)provides an effective complementary approach for conventional rice breeding with precise and speedy mobilization of target genes into elite genetic *** targeted genes,however,may not be selected in the course of MAS due to the occasional recombination between the marker and the target gene/QTL during the many cycles of meiosis involved in breeding *** leads to failure in the selection of target traits(Gopalakrishnan et al,2008).

关键词： breeding elite Marker